Foreword Mazoon Electricity Company SAOC Page i. Distribution System Capability Statement

Transcription

1 Foreword Although every effort has been made to ensure the accuracy of the data provided in this statement, Mazoon Electricity Company SOAC (MZEC) does not accept any liability for the accuracy of the information contained herein, and in particular neither MZEC nor its directors or its employees shall be under any liability for any misstatement or opinion on which the recipient of this statement relies or seeks to rely. No part of this Statement may be reproduced, stored in a retrieval system, transmitted or further distributed in any form or means electronic, mechanical, photocopying, recording or otherwise for any purpose other than with the written permission of MZEC. Mazoon Electricity Company SAOC Page i

2 Company Profile The electricity sector in the Sultanate of Oman has been extensively restructured following the implementation of the law for the regulation and privatization of the electricity and related water sector ("The Sector Law"). The Sector Law was promulgated by Royal Decree 78/2004 on 1 August The law provided for the unbundling of the electricity and related water activities previously undertaken by the Ministry of Housing, Electricity and Water (MHEW). A number of successor companies are authorized by licenses issued by the Authority for Electricity Regulation, Oman to undertake certain regulated activities. Mazoon Electricity Company SAOC (MZEC) is one of Nama Groups and is authorized to undertake the regulated activities of distribution and supply within the authorized area stipulated in its License. It serves a large supply area of almost km 2 in the north-east corner of Oman. MZEC s supply area is split into four governorates which are Al Dakhilyiah (to the central-north of Oman), North Al Sharqiyah and South Al Sharqiyah (the coastal region to the Eastern part of Oman) and South Al Batinah and Wilayat of Suwaiq (the coastal region to the north-east of Oman). In this statement the four governorates will be considered as three supply regions as following: Al Dakhilyiah, Al Sharqiyah which consists of South Al Sharqiyah Governorate and North Al Sharqiyah Governorate and South Batinah. Among the Four governorates, South Al Batinah Governorate has the highest number of customer accounts with estimated supply area of 6260 km 2 followed by Al Dakhilyiah with an estimated supply of km 2 with the second highest number of customer accounts. South Al Sharqiyah Governorate and North Al Sharqiyah Governorate are the biggest among the four supply areas with an estimated supply area of km 2 and has the lowest number of customer accounts as shown in the flow chart below. Customers Account 400, , , , , , , , ,351 70,248 67, ,909 50,000 0 Al Dakhilyiah North Al Sharqiyah South Al Sharqiyah South Al Batinah MZEC Mazoon Electricity Company SAOC Page ii

3 Mazoon Electricity Company SAOC owns and operates the electricity distribution network after the 33 KV incomers circuit breakers at the grid stations down to the customer s point of supply, which includes the 33 kv, 11 KV and the low voltage distribution networks and intermediate primary and secondary substations. The 33 kv distribution network is supplied from the transmission network of the Oman Electricity Transmission Company (OETC) through seventeen 132/33 kv grid stations on the transmission system spread across the supply area. Fifteen of the 132/33 KV grid stations, namely Muladah, Khabourah (shared with Majan EC), Mudhairib, Mudhaibi, Jalan Bani Bu Ali, Khdrah, AL Eigga, Interconnection Substation (MIS), Bahla, Nizwa, Madinat Nizwa Nakhal, Izki, Sumail-A and Sur are of the standard 2x125 MVA transformer, two with 3x125 MVA which are Barka and Rustaq, and one with 2x160 MVA (Al Swadi) design with a crossover arrangement such that the transformers supply both 33 KV busbars. The remaining stations are of the more conventional design without the crossover arrangement, one with 2x63 MVA transformers Sumail-B and one with 2x40 MVA (Adam). Mazoon Electricity Company SAOC Page iii

4 Table of Contents Foreword... i Company Profile... ii Introduction... 1 I Purpose of Statement... 1 II Content of Statement... 1 IV Contact details for further information... 2 Summary Information Design Philosophies and Practices Background Operational Environment Technical, Design and Operational Criteria Voltage regulation Frequency deviations Voltage waveform quality Voltage fluctuations Auto-reclosing and single phase Protection Operation Technical standards applying to Distribution System Users Specific design and performance standards Specification of apparatus and Plant Earthing Voltage control and regulation Protection Superimposed signals General requirements for Connection Declaration of Demand characteristics Supplies at Low Voltage Supplies other than at Low Voltage Connection arrangements Electrical Delivery Points Communications Technical requirements for Connections Apparatus and Plant at the ownership boundary Protection requirements Earthing Fault level considerations Capacitive and inductive effects Telemetry Requirements for Embedded Gensets General requirements Provision of information Information required from all Embedded Gensets Additional information required from some Embedded Gensets Technical requirements Genset performance requirements Control arrangements Coordinating with existing protection Islanding Mazoon Electricity Company SAOC Page iv

5 Black Start capability Genset commissioning tests The 33 kv System System Configuration System Security Selection and Application of Plant Transformers Switchgear Overhead Lines Underground Cables Short Circuit Levels Protection The 11 kv System System Configuration System Security Selection and Application of Plant Distribution Substations Overhead lines Underground Cables Short Circuit Levels Protection The Low Voltage System System Configuration Selection and Application of plant Distribution Substations Overhead Lines Underground Cables Protection Operating Voltage Load Management Areas Other Interconnected Networks The 33 kv System Load Flow Study Introduction Purpose of the Study The 33 kv Distribution Network The Load Flow Analysis Presentation of Results and Single Line Diagrams for the s The 33 kv Short Circuit Analysis Voltages Non Compliance Distribution System Security Standards (DSSS) Demand Forecast Introduction Load Curves Demand forecast Methodology Autonomous Demand Growth Corporate Projects/Customers: Strategic Development Statement for Al Dakhilyiah Governorate Existing Capacity at Grid Substations Reinforcement of the Nizwa Area Reinforcement of Bahla Area Reinforcement of Izki Area Mazoon Electricity Company SAOC Page v

6 Reinforcement of Sumail Area Reinforcement of Adam Area Strategic Developments for North Al-Sharqiyah Governorate Existing Capacity at Grid Substations Reinforcement of Mudhaibi Area Reinforcement of Ibra Area Reinforcement of Wadi Tayeen Area Reinforcement of Bidyah Area Strategic Developments for South Al Sharqyiah Governorate Existing Capacity at Grid Substations Reinforcement of Sur Area Reinforcement of Al Kamil and Jalan Bani Bu Hassan Area Reinforcement of Jalan Bani Bu Ali Area Strategic Development Statement for South Al Batinah Governorate Grid Substations Reinforcement of the Suwaiq area Reinforcement of the Nakhal Area Reinforcement of the Barka Area Reinforcement of the Rustaq Area Sponsor Projects Assessment of MZEC Distribution System losses Network Suitability for New Connections Mazoon Electricity Company SAOC Page vi

7 Lists of Tables Table 1: Voltage Regulation... 4 Table 2: Number of 33/11.5 kv substations and transformers up to August Table 3: Current Ratings of Bus Bar, Bus-section, Transformer and Feeder Bays...15 Table 4: Number of distribution transformer until August Table 5: MZEC s operating voltages...18 Table 6: Distribution System Security Standards...22 Table 7: MZEC peak load...23 Table 8: Peak Demand in MW of Corporate Projects by Customer Category expected in Table 9: MZEC coincident after diversity and load factor...30 Table 10: Grid Substations load at Al Dakhilyiah Governorate...31 Table 11: Projects Associated with Reinforcement of the Nizwa Area in 2017 (Madinat Nizwa)...32 Table 12: Projects Associated with Reinforcement of the Nizwa Area in Table 13: Projects Associated with Reinforcement of the Nizwa Area in Table 14: Projects Associated with Reinforcement of the Nizwa Area in Table 15: Projects Associated with Reinforcement of Bahla Area in Table 16: Projects Associated with Reinforcement of Bahla Area in Table 17: Projects Associated with Reinforcement of Izki Area in Table 18: Projects Associated with Reinforcement of Izki Area in Table 19: Projects Associated with Reinforcement of Izki Area in Table 20: Projects Associated with Reinforcement of Sumail Area in Table 21: Projects Associated with Reinforcement of Adam Area in Table 22: Available Grid Substation Capacity in North Al Sharqiyah Governorate...41 Table 23: Projects Associated with Reinforcement of the Al-Mudhaibi Area in Table 24: Projects Associated with Reinforcement of the Al-Mudhaibi Area in Table 25: Projects Associated with Reinforcement of the Al-Mudhaibi Area in Table 26: Projects Associated with Reinforcement of Ibra Grid in Table 27: Projects Associated with Reinforcement of Ibra Grid in Table 28: Projects Associated with Reinforcement of Wadi Tayeen Grid in Table 29: Projects Associated with Reinforcement of Wadi Tayeen Grid in Table 30: Projects Associated with Reinforcement of Wadi Tayeen Grid in Table 31: Projects Associated with Reinforcement of Bidayah Area in Table 32: Projects Associated with Reinforcement of Bidayah Area in Table 33: Projects Associated with Reinforcement of Bidayah Area in Table 34: Load at Grid Substations of South Al Sharqyiah Governorate...48 Table 35: Projects Associated with Reinforcement of Sur Area in Table 36: Projects Associated with Reinforcement of Sur Area in Table 37: Projects Associated with Reinforcement of Sur Area in Table 38: Projects Associated with Reinforcement of the Al Kamil and Jalan Bani Bu Hassan Area in Table 39: Projects Associated with Reinforcement of the Al Kamil and Jalan Bani Bu Hassan Area in Table 40: Projects Associated with Reinforcement of the Al Kamil and Jalan Bani Bu Hassan Area in Table 41: Projects Associated with Reinforcement of the Jalan Bani Bu Ali Area in Table 42: Projects Associated with Reinforcement of the Jalan Bani Bu Ali Area in Table 43: Projects Associated with Reinforcement of the Jalan Bani Bu Ali Area in Table 44: Grid stations load at South Al Batinah governorate...53 Table 45: Projects Associated with Reinforcement of Suwaiq Area in Table 46: Projects Associated with Reinforcement of Suwaiq Area in Table 47: Projects Associated with Reinforcement of Musanah Area in Mazoon Electricity Company SAOC Page vii

8 Table 48: Projects Associated with Muladah-B grid station at Musanah Area in Table 49: Projects Associated with Reinforcement of Musanah Area in Table 50: Projects Associated with Reinforcement of the Nakhal Area...60 Table 51: Projects Associated with Reinforcement of Barka Area in Table 52: Projects Associated with Reinforcement of the Barka Area in Table 53: Projects Associated with Reinforcement of the Madinat Barka-B grid station in Table 54: Projects Associated with Reinforcement of the Barka Area in Table 55 : Projects Associated with Reinforcement of Rustaq Area in Table 56: Projects Associated with Reinforcement of Rustaq Area in Table 57: Projects Associated with Reinforcement of Rustaq Area in Table 58: Sponsor Project in Table 64: Sponsor Project in Table 60 : Sponsor Project in Table 66: MZEC losses s...68 Lists of Figures Figure 3: The Load Profile of MZEC...24 Figure 4: Weekly Load Profile...25 Figure 5: MZEC ly Load Profile 2016 (Jan-Oct)...25 Figure 6: Regional Individual Maximum Load...26 Figure 7: Oman ISC population statistics , extrapolated to Figure 8: MZEC losses regional wise (2015, 2016 vs target 2016)...68 Figure 9: Regional Losses Contribution to the overall MZEC losses...69 Mazoon Electricity Company SAOC Page viii

9 Introduction I Purpose of Statement This Capability Statement is prepared in accordance with the Distribution & Supply License Condition 32: Distribution System Capability Statement and Clause DPC.4.4 (Three Capability Statement) of the Distribution Planning Code to assist existing and future users of MZEC s network in examining opportunities available to them to make new or additional use of the network. The aim of the Three Capability Statement is to: 1) Improve the availability of distribution network information. 2) Furnish developers with sufficient information to carry out initial assessments of network capability. 3) Inform users of distribution network about development proposals. II Content of Statement The statement contains information regarding the 33 kv and 11 kv systems and the transformation level to 11 kv that are owned and operated by MZEC. Some of the requirements for the connection to the Distribution System derived from the {Distribution Code Distribution Connection Conditions Code (DCC)}, design philosophies employed by MZEC, general description of MZEC s Distribution System are included in the Summary Information section. Introduction An overview of the Long Term Development Statement intended to enable users and potential users of the network to understand the scope of the information provided and to assess if it would be of use to them. Summary Information This is a general description of the design philosophies and practices appropriate to the whole of the distribution network. Load Flow Study of the 33 kv Network A general and brief description of the load flow study analysis carried on MZEC s 33 KV network using ETAP software is presented in this part of the statement. Short Circuit Study of the 33 kv Network A brief outlining of the short circuit study analysis results conducted on the 33 KV networks of the four Governorates are presented. Mazoon Electricity Company SAOC Page 1

10 Voltage Non-Compliance Non-compliance towards the voltage standards is presented for the 33 kv bus bars at the primary substations only is addressed in section 10. Distribution System Security Standards (DSSS) After the approval of the Distribution System Security Standards in November 2008, compliance with the planning standards has become a compulsory issue. This is presented in section 11. Load Curves Sample graphs of MZEC s load curve (yearly, weekly and daily) are presented in section 12. Commented [A1]: nnual, weekely and daily curves are enough Strategic Development Statements of MZEC Licensed areas These development statements for the four Governorates Al Dakhilyiah, North Al Sharqiyah, South Al Sharqiyah and South Al Batinah governorates are presented in a detailed form in section 13. IV Contact details for further information Requests for a copy or even copies of this Capability Statement or for assistance in interpretation and clarification of the information contained in the statement should made to: Senior Planning & Asset Management Manager Mazoon Electricity Company SAOC P.O. Box 1229 P.C. 131, Al-Hamriya Sultanate of Oman Tel Fax mohammed.algunaimi@mzec.co.om Mazoon Electricity Company SAOC Page 2

11 Summary Information 1. Design Philosophies and Practices 1.1 Background Mazoon Electricity Company SAOC (MZEC) has a functional philosophy that underlies the development of the distribution system at the three voltages 33, 11 and kv. This ensures that the whole distribution system satisfies the following fundamental design criteria throughout the planning period: 1) Compliance with all legal and statutory requirements, 2) Compliance with all regulatory requirements, including the Grid Code and the Distribution Code, 3) Compliance with all relevant national and international standards, 4) Ability to meet the demands placed upon it in terms of customer requirements, supply performance (availability and reliability) and supply quality (voltage and waveform quality). The distribution system must also be capable of being operated, maintained, repaired, extended and replaced as necessary during its life, without exceeding design levels of risk to the customers it serves. 1.2 Operational Environment The distribution system has to be designed such that it is capable of continuous operation under the range of climatic conditions that can be reasonably expected in the geographic region covered by MZEC s distribution system. 1.3 Technical, Design and Operational Criteria The Distribution System and any Distribution System User Connections to the Distribution System shall be designed to be consistent with the security requirements of Condition 31 of the Distribution and Supply License. MZEC will ensure that the Distribution System complies with the following technical, design and operational criteria in relation to the part of the Distribution System at the Connection Site with a Distribution System User Voltage regulation The voltage on the 33 kv and 11 kv sides of Distribution transformers at Connection Sites with Distribution System Users shall normally be controlled within the limits± 6%of the nominal value. During some System Disturbances such as where short circuits occurs, the voltage may collapse transiently to zero at the point of fault until the fault is cleared. Under fault and circuit switching conditions the 50.00Hz Frequency component of voltage may fall or rise transiently. The fall or rise in voltage will be affected by the method of earthing of the neutral point of the Distribution System and this variation in voltage shall be taken into account in selecting apparatus and Plant from an appropriate specification for installation or Connection to the System. Mazoon Electricity Company SAOC Page 3

12 The voltage at the Consumer s terminals shall not vary from the System nominal voltage by more than (see Table 1) Table 1: Voltage Regulation Consumers Connected at Nominal Voltage Tolerance HV 33/11 kv ± 6% LV 415/240 V ± 6% Frequency deviations During normal operating conditions, the nominal System Frequency of the Transmission and Distribution Systems will be Hz and normally will be controlled by Oman Electricity Transmission Company (OETC) between 49.95Hz and 50.05Hz. During exceptional steady state conditions, Frequency deviations will not exceed 49.90Hz to 50.10Hz unless disturbed circumstances prevail. Under disturbed conditions, System Frequency could rise transiently to Hz or fall to Hz Voltage waveform quality All apparatus and Plant Connected to the Distribution System, and that part of the Distribution System at each Connection Point, should be capable of withstanding the following distortions of the voltage waveform in respect of harmonic content and phase unbalance. The maximum total levels of harmonic distortion on the Distribution System at, 33 kv and 11 kv, from all sources under both normal, planned outage and fault outage conditions, shall not exceed a total harmonic distortion of 2.0 % with no individual harmonic greater than 1.5 % unless abnormal conditions prevail. At LV the maximum total levels of harmonic distortion from all sources shall not exceed a total harmonic distortion of 2.5 %. The maximum negative phase sequence component of the phase voltage on the Distribution System should remain below 1.0 % unless abnormal conditions prevail. A maximum value of 2.0 % is permitted for phase unbalance Voltage fluctuations Voltage fluctuations arising from fluctuating Demands Connected at a Connection Point to the Distribution System shall not exceed 1.0% of the voltage level for step changes that may occur repetitively. Any large voltage excursions other than step changes may be allowed up to a level of 3.0% provided that this does not constitute a risk to the Distribution System or to any Distribution System User Auto-reclosing and single phase Protection Operation Distribution System Users should be aware that MZEC may use auto-reclosing or sequential switching features on the Distribution System. MZEC will on request provide details of the auto- Mazoon Electricity Company SAOC Page 4

13 reclosing or sequential switching features in order that the Distribution System User may take this into account in the design of the User s Distribution System, including Protection arrangements. Distribution System Users should be aware that the Protection arrangements on some Distribution Systems may cause disconnection of one phase or two phases only of a three phase Supply for certain types of fault. 1.4 Technical standards applying to Distribution System Users All Distribution System User apparatus and Plant associated with the Connection to the Distribution System shall comply with the following standards, as applicable (in the following order of precedence): (a) Safety Rules; (b) Oman Electrical Standards (OES), which are such national standards as may be amended by the Distribution Code Review Panel from time to time and approved by Authority for Electricity Regulation, Oman the Authority or which are imposed under the Sector Law; (c) The standards and recommendations of the International Standards Organization and the International Electro technical Commission; and (d) National standards and codes which are accepted internationally. Further advice will be made available upon request to MZEC. In the event that any standard or specification with which a Distribution System User s Plant and/or apparatus is required to comply under DCC.5 is amended, MZEC, having consulted with the affected Distribution System Users, will bring the issues to the Distribution Code Review Panel for consideration. Following the review, the Distribution Code Review Panel will make a recommendation to the Authority for approval as to what action, if any, should be taken regarding compliance. Where MZEC determines that in order to ensure safe and coordinated Operation of a Distribution System User s Plant and/or apparatus with the Distribution System, there is a requirement for supplemental specifications and/or standards to apply to the design of a Distribution System User s Plant and/or apparatus, MZEC shall notify the Distribution System User and the Distribution System User shall comply with the additional requirements. On request from the Distribution System User, a Licensed Distributor shall provide reasonable evidence as necessary to demonstrate the need for the supplemental specifications and/or standards. If a Distribution System User is still not satisfied, the Distribution System User may refer the issue to the Distribution Code Review Panel for review Specific design and performance standards Specification of apparatus and Plant The specifications of apparatus and Plant shall be such as to permit operation of the Distribution System within the Safety procedures of MZEC, details of which will be made available by MZEC upon request. Apparatus and Plant shall be suitable for use at the operating Frequency, within the intended operating voltage range and at the design short-circuit rating of the Distribution System to which it is Connected having due regard to fault carrying capabilities and making and breaking duties. In Mazoon Electricity Company SAOC Page 5

14 appropriate circumstances, MZEC will provide details of the System to which Connection is to be made. Apparatus and Plant shall be operated within the thermal rating conditions contained in the appropriate standards, specifications, and other relevant publications, taking into account the intended use. Upon request, MZEC will make such information available Earthing MZEC can advise on the method of earthing of the Distribution System, for example, whether it is connected solidly to Earth or through impedance. The specification of associated apparatus and Plant of the Distribution System User shall meet the voltages that will be imposed on the apparatus and Plant as a result of the method of earthing. The methods of earthing should comply with the requirements of Oman Electrical Standards. Distribution System Users shall take precautions to limit the occurrence and effects of circulating currents in respect of the neutral points connected with earth where there is more than one source of electricity Voltage control and regulation Any extension or Connection to the Distribution System shall be designed in such a way that it does not adversely affect the voltage control employed by MZEC on the Distribution System. MZEC if requested by the Distribution System User will make information on the voltage regulation and control arrangements available Protection The Distribution System and the System of any Distribution System User Connected to the Distribution System shall incorporate protective devices to ensure that apparatus and Plant with electrical faults are disconnected from the System promptly and that the effects of faults on one System do not impose unreasonable risks to other Systems. To ensure satisfactory operation of the Distribution System, Protection Systems, operating times, discrimination, and sensitivity at the ownership boundary shall be agreed between MZEC and the System User during the process of application for Connection and may be reviewed from time to time by MZEC with the agreement of the customer. Back-up Protection by Operation of other circuit breakers or apparatus and Plant having a similar function must normally be provided, to safeguard the System against a circuit breaker, or apparatus and Plant having a similar function, failing to Operate correctly to interrupt fault current on a High Voltage System. During the process of application for connection, MZEC will advise the Distribution System User if Back-up protection is not required. Distribution System Users shall not use protection and associated apparatus and plant to limit the fault current in feed to the Distribution System, if the failure of that protection and associated apparatus and plant to operate as intended in the event of a fault, could cause apparatus and plant owned by MZEC to operate outside its short-circuit rating, unless MZEC should advise otherwise. Mazoon Electricity Company SAOC Page 6

15 Superimposed signals Where Distribution System Users install mains-borne signaling apparatus and plant it shall comply with European Standard EN50065 as amended from time to time. Prior agreement shall be obtained in writing from MZEC where a Distribution System User proposes to use such apparatus and plant that may superimpose signals on the Distribution System. 1.5 General requirements for Connection DCC.6 ensures that all Distribution System Users of the Distribution System are subject to the same requirements for connection. DCC.6 specifies the information required from Distribution System Users by MZEC in order to ensure that adequate technical provision is made for new Supplies or increases in existing Demand. DCC.6 also applies to Gensets that Operate in parallel with the Distribution System, where a supply is required from MZEC under normal or Emergency Conditions Declaration of Demand characteristics Supplies at Low Voltage For Supplies at Low Voltage it is possible in most cases to assess whether a proposed Connection is acceptable, and to determine the necessary Supply arrangements, from analysis of the following limited data: (i) Maximum power requirements ( kva or kw and Power Factor); (ii) Type and electrical loading of apparatus and Plant to be Connected, e.g. number and size of motors, electrical cooling arrangements; and (iii) The date when the Connection is required. These data requirements will be specified on the appropriate application for Connection form obtainable from MZEC. Should a preliminary examination of this data indicate that more detailed information is required then it shall be provided to MZEC upon request if reasonably required Supplies other than at Low Voltage For Supplies other than at Low Voltage it may be necessary for the following additional information to be provided on request: (i) All types of Demand: (a) Maximum Distribution System User Active Power requirement (MW); (b) Maximum and minimum Reactive Power requirements (MVAr); (c) Type of Demand and control arrangements e.g. controlled rectifier or large motor drives, type of starter employed; (d) Maximum Demand on each phase at time of maximum Demand; and (e) The maximum harmonic currents to be imposed on MZEC Distribution System. (ii) Fluctuating Demands: Details of the cyclic variation, and where applicable the duty cycle, of Active Power (and Re-active Power, if appropriate), in particular: (a) The rates of change of Active and Reactive Power, both increasing and decreasing; Mazoon Electricity Company SAOC Page 7

16 (b) The shortest repetitive time interval between fluctuations in Active Power and Reactive Power; and (c) The magnitude of the largest step changes in Active Power and Reactive Power, both increasing and decreasing. In some cases, more detailed information may need to be provided to permit a full assessment of the effect of the Demand on the Distribution System. Such information may include an indication of the pattern of buildup of Demand and a proposed commissioning program. MZEC will specifically request this information when necessary Connection arrangements The design of Connections between the Distribution System and Distribution System Users shall be in accordance with the principles set out in the DCC, subject to any modification to which MZEC may reasonably consent. During the process of application for Connection MZEC will agree with the Distribution System User the voltage level to which a Distribution System User will be connected in accordance with its normal practice for the type of Demand to be supplied. MZEC may on occasion specify a different Connection voltage from normal in order to avoid potential disturbance caused by the Distribution System User apparatus to other Distribution System Users of the Distribution System or for other technical reasons or may agree alternative methods for minimizing the effects of disturbing Demands. Before entering into an ECA/ECUOSA it will be necessary for MZEC to be reasonably satisfied that the Distribution System User s System at the boundary with the Distribution System will comply with all appropriate requirements of the Distribution Code Electrical Delivery Points The point or points at which Supply is given or taken will be the Electrical Delivery Points as specified in the ECA/ECUOSA. For Supplies at Low Voltage the general rule is that the Electrical Delivery Point will be at the Distribution System User terminals of the Metering System. For High Voltage Supplies, including Connections between MZEC and Distribution System Users, and where necessary, bus bar Connected Supplies at Low Voltage, the points of Supply will be the Electrical Delivery Points as specified in the ECA/ECUOSA. The respective ownership of Plant or apparatus will be recorded in the ECA/ECUOSA between a MZEC and the Distribution System User as required. In the absence of a separate agreement between the parties to the contrary, construction, commissioning, control Operation and maintenance responsibilities follow ownership. Paragraph DCC.9 specifies responsibilities at the Connection Site Communications Where, for operational reasons, MZEC determines that a means of routine and emergency communication between MZEC and the Distribution System User is required then the same shall be provided and maintained by the Distribution System User. Mazoon Electricity Company SAOC Page 8

17 1.6 Technical requirements for Connections Apparatus and Plant at the ownership boundary All apparatus and Plant at the ownership boundary shall meet the design principles contained within DCC.4. Connections for entry to and exit from the Distribution System shall incorporate a means of disconnection of the installation by MZEC Protection requirements Protection requirements vary widely depending on established practices and the needs of the particular Distribution System. The basic requirement in all cases is that Distribution System User arrangements for Protection at the ownership boundary, including types of apparatus and Plant and Protection settings, must be compatible with standard practices on the Distribution System, as specified by MZEC during the process of application for Connection. In particular; (i) Maximum clearance times (from fault current inception to arc extinction) must be within the limits established by MZEC in accordance with Protection and apparatus and Plant short circuit rating policy adopted for the Distribution System; (ii) In Connecting to the Distribution System the Distribution System User should be aware that auto-reclosing or sequential switching features may be in use on the Distribution System. MZEC will on request provide details of the auto-reclosing or sequential switching features in order that the Distribution System User may take this into account in the design of the Distribution System User System, including Protection arrangements; and (iii) The Distribution System User should also be aware that the Protection arrangements on some Distribution Systems, e.g. rural, may cause disconnection of one phase only of a three phase Supply for certain types of fault Earthing Earthing of that part of the Distribution System User System that is connected to MZEC s Distribution System shall comply with the arrangements specified in DCC Fault level considerations The short circuit rating of Distribution System User s apparatus and Plant at the Connection Point should be not less than the design fault level of the Distribution System to which it is connected. The choice of apparatus and Plant for Connection at Low Voltage may take into account attenuation in the service lines in accordance with Good industry Practice. MZEC in the design of its System will take into account the contribution to fault level of the Connected System and apparatus. In order to permit these assessments to be carried out information should be exchanged on prospective fault power in feed and X/R ratios, where appropriate, at points of entry to and exit from the Distribution System Capacitive and inductive effects The Distribution System User shall, when applying to make a Connection, provide MZEC with information as detailed in DCC.7. Details will be required of capacitor banks and reactors connected at High Voltage which could affect the Distribution System and which it is proposed to Connect if Mazoon Electricity Company SAOC Page 9

18 agreed by MZEC. When requested by MZEC details of distributed circuit capacitance and inductance shall also be provided. Sufficient detail is required to: (i) Verify that controlling apparatus and Plant of the Distribution System is suitably rated; (ii) Show that the performance of the Distribution System will not be impaired; and (iii) Ensure that arc suppression coils when used by MZEC for System Earthing purposes are correctly installed and operated Telemetry The Distribution System User should provide such voltage, current, Frequency, Active Power and Reactive Power pulses and outputs and status points from its System as are considered reasonable by Licensed Distributors to ensure adequate System monitoring. The telemetry outstation in such a situation will be provided, installed and maintained by MZEC. Under the requirements of the Grid Code new CDGensets and Production Facilities will need to provide signals to OETC for monitoring purposes. If it is agreed between the parties that MZEC shall control the switchgear on the Distribution System User s System MZEC shall install the necessary telecontrol outstation. Notwithstanding the above, it shall be the responsibility of the Distribution System User to provide the necessary control interface for the Distribution System User switchgear that is to be controlled. 1.7 Requirements for Embedded Gensets General requirements Embedded CDGensets shall comply with the general principles of the Grid Code, subject to the particular requirements of MZEC necessitated by the adjacent Distribution System conditions, which will be made known by MZEC during the Connection application process. Copies of data supplied in accordance with the Grid Code shall be given to MZEC Provision of information Embedded Gensets will fall within three basic classes for which the Power Producer shall provide the following minimum information to MZEC during the process of Connection application or otherwise as requested by MZEC. When applying for Connection to the Distribution System Power Producers shall also refer to DCC.5 and OES. The three basic classes are; a - Embedded CDGensets (All Gensets with a Registered Capacity of 5MW or greater will be centrally dispatched); b - Embedded Gensets Connected at or below 20 kv and with an output not in excess of 5MW; and c - Embedded Gensets who are to be connected at Low Voltage and less than 300 kva in capacity. MZEC will use the information provided to model the Distribution System and to decide what method of Connection will need to be employed and the voltage level at which the Connection should be made. If MZEC reasonably concludes that the nature of the proposed Connection or changes to an existing Connection requires more detailed consideration then further information may be requested. It is unlikely that more information than that specified in DCC will be required for Embedded Gensets who are to be connected at Low Voltage and are less than 50 KVA in capacity, or connected at other than Low Voltage and less than 300 kva in capacity. Mazoon Electricity Company SAOC Page 10

19 1.7.3 Information required from all Embedded Gensets Each Power Producer will provide to MZEC information on (a) the Gensets and (b) the proposed interface arrangements between the Genset and the Distribution System. MZEC may require the following information before entering into an ECA/ECUOSA to connect any Gensets to the Distribution System: Genset data a Terminal volts; kv b Rated Capacity; kva c Rated Capacity; kw d Maximum Active Power sent out Reactive Power requirements (if any); kwso max kvar e Type of Genset; Synchronous, asynchronous, etc f Type of prime-mover; g Anticipated operating regime of Gensets; Continuous, intermittent, peak lopping h Fault level contribution; ka I Method of voltage control; j Generator transformer details; As applicable k Requirements for top-up Supplies and/or standby Supplies; Interface arrangements a b c d The means of Synchronization between MZEC and Distribution System User; Details of arrangements for Connecting with earth that part of the User System Connected to the Distribution System; The means of Connection and disconnection which are to be employed; Precautions to be taken to ensure the continuance of safe conditions should any earthed neutral point of the User System Operated at HV become disconnected from earth; Additional information required from some Embedded Gensets MZEC may request the information before entering into an ECA/ECUOSA to connect any Gensets greater in size than 5 MW or connected at a voltage level above 11 kv onto the Distribution System Technical requirements Genset performance requirements For Embedded CDGensets the electrical parameters required would be those detailed in the Grid Code. Mazoon Electricity Company SAOC Page 11

20 For Gensets not subject to Central Dispatch the electrical parameters that must be achieved at the Genset terminals are defined according to the Connection method and will be specified by MZEC with the offer for Connection. Each Genset or Production Facility must be capable of Supplying its Registered Capacity within the Total System Frequency range to Hz. The output power should not be affected by voltage changes within the permitted operating range Control arrangements Licensed Distributors will specify in writing if a continuously acting fast response automatic excitation control System is required to control the Genset voltage without instability over the entire operating range of the Genset or Production Facility. This will be dependent on the size and type of Genset or Production Facility and the part of the Distribution System to which it is connected Coordinating with existing protection It will be necessary for the Protection associated with Embedded Gensets to co-ordinate with the Protection associated with the Distribution System as follows: (i) For Gensets Connected to the Distribution System the Genset must meet the target clearance times for fault current interchange with the Distribution System in order to reduce to a minimum the impact on the Distribution System of faults on circuits owned by Power Producers. MZEC will ensure that MZEC Protection settings meet its own target clearance times. The target clearance times are measured from fault current inception to arc extinction and will be specified by MZEC to meet the requirements of the relevant part of the Distribution System. (ii) The settings of any Protection controlling a circuit breaker or the operating values of any automatic switching device at any Connection Point with the Distribution System shall be agreed between MZEC and the Distribution System User in writing during the Connection consultation process. The Protection settings or operating values shall not be changed without the written agreement of MZEC. (iii) It will be necessary for the Genset Protection to co-ordinate with any auto-reclose policy specified by MZEC. (iv) Any Genset or Production Facility Connected to the Distribution System will be required to withstand, without tripping, the negative phase sequence loading incurred during the clearance of a close-up phase-to-phase fault by System Backup Protection which will be within the Plant short time rating on the Distribution System. MZEC will advise the Power Producer of the expected negative phase sequence loadings during the ECA/ECUOSA process Islanding It is possible that a part of a Distribution System to which Embedded Gensets are connected could, during Emergency Conditions, become detached from the rest of the Distribution System. MZECshall decide dependent on local network conditions, if it is desirable for the Embedded Gensets to continue to Generate onto the islanded Distribution System. Mazoon Electricity Company SAOC Page 12

21 If no facilities exist for the subsequent resynchronization of the islanded section of the Distribution System with the rest of the Distribution System then the Embedded Genset will under Licensed Distributor instruction, ensure that the Genset is disconnected for resynchronization. Under Emergency Conditions there is an expectation that some Gensets will continue to operate outside the Frequency limits set down in the Grid Code CC.6. However, for Embedded Gensets Connected to the Distribution System at a voltage level less than 33 kv it is likely that this could mean Connection within an automatic under-frequency Demand disconnection zone. Consequently, Embedded Gensets should ensure that all Protection on Gensets should have settings to co-ordinate with those on the automatic under-frequency Demand disconnection apparatus and Plant that will be detailed by MZEC on request Black Start capability Each Embedded Power Producer shall notify MZEC if its Gensets has a restart capability without Connection to an external power Supply, unless the Embedded Genset shall have previously notified OETC accordingly under the Grid Code Genset commissioning tests Where Gensets require Connection to the Distribution System in advance of the commissioning date, for the purposes of testing, the Genset must comply with the requirements of the ECA/ECUOSA. The Power Producer shall prepare a commissioning program and obtain approval to the program from MZEC to allow commissioning to be coordinated. 2. The 33 kv System 2.1 System Configuration The 33 kv System of MZEC serves in a distribution role between the OETC and the 11 kv system as direct 132/11 kv transformation is not in use. The system consists mainly of 33 kv feeders, 33/11kV primary substations and 33/0.415 kv transformers installed on some feeders where it is not feasible to develop 11 kv network due to limited amount of demand. The 33 kv feeders emanate from the 132/33 kv grid stations to supply the 33/11 kv primary substations. Primary substations are of two types, namely indoor type and outdoor type. Indoor primary substations are mainly of 2x10 MVA and 2x20 MVA with 33 kv outdoor/indoor circuit breakers and 14 panels 11 kv indoor switchgear. Indoor primary substations are proposed to be constructed during the coming years to supply highly growing areas. Outdoor primary substations are installed throughout the four governorates of MZEC in urban and rural areas where demand is normally less than 12 MVA. The normal practice is to supply each primary substation with two 33 kv feeders; each feeder is feeding one transformer and serves as an alternative supply for the whole substation in case the other feeder fails. Along the 33 kv feeders, Tees are used to connect primary substations. The whole network is interconnected especially at South Al Batinah and Al Dakhilyiah governorate except in few situations, where radial feeders without interconnections with other feeders feed primary substations. Mazoon Electricity Company SAOC Page 13

22 2.2 System Security The majority of MZEC s primary substations are of the standard two transformers type with two separate 33 kv and 11 kv busbars. In some cases where demand is much less than the capacity of two transformers, which is normal in remote rural areas, primary substations with only one 33/11 kv transformer are installed. The 33 kv network is designed and will be developed to meet its customer s satisfaction and comply with the Distribution System Security Standards (DSSS). 2.3 Selection and Application of Plant Transformers Transformers installed in the 33 kv system are categorized into 33/11.5 kv and 33/0.433 kv. 33/11.5 kv transformers are standard as far as the 33 kv system is concerned. The ratings in use are 1, 3, 6, 10 and 20 MVA. The 1, 3 and 6 MVA transformers are equipped with Off Load Tap Changers, whereas 10 and 20 MVA transformers are equipped with On Load Tap Changer. All transformers comply with the requirements of IEC 76/BSS 171. The temperature rise of winding shall not exceed 50 Deg. C by resistance of oil, 40 Deg. C by thermometer over an ambient of 50 Deg. C. The 33/0.433 kv transformers are naturally cooled outdoor oil immersed core type and are complying with the requirements of IEC 76/BSS 171 except that the temperature rise shall not exceed 50 Deg. C for winding by resistance and 40 Deg. C for oil by thermometer. The smallest rating in use for this category is 50 kva and the highest is 1000 kva. Currently, the number of 33/11.5 kv substations and transformers exists in the system up to August 2016 are shown in Table 2. Table 2: Number of 33/11.5 kv substations and transformers up to August 2016 Asset Type Quantity Total North Sharqiyah South Sharqiyah South Al Batinah Al Dakhilyiah 20MVA MVA MVA MVA 7 N/A MVA Total No. of Transformers Mazoon Electricity Company SAOC Page 14

23 2.3.2 Switchgear The 33 kv indoor switchgear is of single bus bar, totally enclosed metal-clad type with withdraw able circuit breakers or metal-clad SF6 insulated with vacuum or SF6 circuit breakers. 11 kv and 33 kv current ratings of the bays are shown in Table 3. Table 3: Current Ratings of Bus Bar, Bus-section, Transformer and Feeder Bays Rating 11 kv at Primary substations 33 kv Bus-bar 2000 A 2000A Bus-Section 1200 A 1200A Transformer 1200 A 600A Feeder 400 A 600A Overhead Lines Overhead lines are extensively used due to the rural character of MZEC s Authorized Area. These are mainly bare ACSR conductors with conductor sizes of 150 mm 2 (wolf) or 200 mm 2 (panther) on wooden and concrete poles supported by post insulators. Up to August 2016 the installed overhead line hit a total of km Underground Cables Due to the rural area character of MZEC s Authorized Area, 33 kv underground cables are mainly used to connect overhead lines with grid stations, connecting some overhead lines with primary substations, road crossings situations and in urban areas and towns where overhead lines cannot be installed. The standard size commonly in use is the 3-core 300 mm 2 copper XLPE cables. It conforms to relevant IEC specifications. The use of underground cable increases significantly and the installed length reached around km in August Short Circuit Levels Switchgear installed on the 33 kv Distribution System will be specified with a three-phase symmetrical short circuit breaking rating not less than 25 ka at 33 kv for 2x20 MVA substations Protection All items of plant will be covered by systems of the main protection. Distance protection is employed for overhead line feeders. 3. The 11 kv System 3.1 System Configuration The main purpose of the 11 kv systems is to distribute electricity into and around local urban and rural areas in an economic, efficient, safe and secure manner whilst meeting the needs of customers. Mazoon Electricity Company SAOC Page 15

24 The general design principle for configuring the distribution system is based on primary substations, indoor and outdoor with mostly two transformers and 11 kv busbars, providing a continuous firm 11 kv supply. The 11 kv feeders emanate from the 33/11 kv indoor and outdoor primary substations are mainly overhead lines feeding the distribution transformers. At all indoor primary substations, 11 kv circuit breakers are provided whereas 11 kv Auto-Reclosers are provided at the outdoor primary substations. Due to the regional character of MZEC s authorized area, 11 kv underground feeders are seldom. Interconnections between feeders from the same primary substation or from different primary substations through Ring Main Units (RMU), Air Break Switches (ABS) and Open Jumpers are the normal practice. These 11 kv feeders are normally operated as radial feeders, with the open point selected for ease of operational access to minimize customer minutes lost, whilst taking account of the need to meet security requirements and minimize system losses and voltage drops. 3.2 System Security In order to meet the customer s expectations and needs, the 11 kv network is designed and will be developed to meet the obligations set out in the relevant codes and comply with the approved Distribution System Security Standards. 3.3 Selection and Application of Plant Distribution Substations Distribution substations are of two types, ground-mounted and pole-mounted. For ground-mounted distribution substations, normally one transformer of rated capacity 500 kva or higher are used, whereas those transformers with ratings less than 500 kva are installed on H-Pole structures. Both types of substations are fed from the 11 kv feeders either directly with jumpers (Pole-Mounted) or through 11 kv cables (Ground-Mounted). Expulsion fuses are used to protect both types of substations on the high voltage side and HRC fuses on the low tension side. However Groundmounted transformers connected through HFU are protected by HRC fuses of 63 A and 31.5 A for 1000 kva & 500 kva respectively. MZEC has already started to implement two smaller ratings, namely 25 and 50 kva to minimize transformer losses arising from using higher ratings for loads which are far away less than the capacity of the transformer. The number of distribution substation exist in the system up to the August 2016 is shown in Table 4. Table 4: Number of distribution transformer until August 2016 Governorate Number of Distribution Substation North Al Sharqiyah 3838 South Al Sharqiyah 2373 Al Dakhilyiah 4892 South Al Batinah 5502 Total Mazoon Electricity Company SAOC Page 16

25 3.3.2 Overhead lines Overhead lines are extensively used. These are mainly bare ACSR conductors with conductor sizes of 100 mm 2 (dog) or 150 mm 2 (wolf) on wooden poles supported by post insulators. MZEC also introduced SAX insulated conductor in areas suffering from severe climates such as Jalan Bani Bu Ali and Sur. There is a total of km of 11 kv overhead lines until August 2016 represents the second highest length of installed circuits in the systems Underground Cables The 11 kv underground cables are mainly used to connect overhead lines with primary substations, connect some distribution substations with overhead lines, road crossings situations and in urban areas and towns where overhead lines cannot be installed. The standard sizes commonly in use are 50 mm 2, 70 mm 2, 120 mm 2, 185 mm 2 and 240 mm 2 copper XLPE three-core cables. Both conform to relevant IEC specifications. However, in the planned areas the connections will only be using underground cables to comply with the Policy of Undergrounding. As stated earlier the increase of use of underground cable have pushed the total installed 11kV underground cables upward and reached around km in August 2016 and expected to increase dramatically in the following years Short Circuit Levels Switchgear installed on the 11 kv Distribution System will be specified with a three-phase symmetrical short circuit rating not less than 18.4 ka at 11kV Protection All feeders are protected against over-current and earth faults whether emanating from indoor or outdoor primary substations and distribution transformers are protected with expulsion fuses on the high voltage side and HRC fuses on the low tension side. In general, the protection will be time graded and arranged to limit the disruption of supplies in the event of a system fault. 4. The Low Voltage System 4.1 System Configuration The main purpose of the LV distribution system is to distribute electricity in local urban or rural areas and to deliver it to customers' LV entry points in an economic, efficient, safe and secure manner. The LV system will normally be developed as a network of tapered radial mains supplied from a distribution substation placed near to the load Centre. 4.2 System Security MZEC s low tension network is designed and will be developed to meet its customer s satisfaction and comply with the approved Distribution System Security Standards. 4.3 Selection and Application of plant Distribution Substations Mazoon Electricity Company SAOC Page 17

26 The main constituents of the distribution substations are the 11/0.433 kv transformers and feeder pillars or cutout boxes. The 800A and 1600 A feeder pillars are normally used with Ground Mounted transformers whereas 400 A control boxes are used for Pole Mounted transformers Overhead Lines Low tension feeders radiate from the distribution substations as insulated overhead lines to supply the customers by Tees either with overhead lines on 9 meter wooden poles or underground cables. New main lines are constructed using insulated conductors of cross-sectional area 120 mm 2, 185 mm 2 and 200 mm 2 according to the load although 95 mm 2 are still in use. There are around km of installed overhead lines till August 2016 and the increase of this type is expected to slow down looking to the intensive use of the underground cable Underground Cables Underground cables are used to connect the overhead lines to the distribution substations. They are also used to connect the premises to the overhead lines. These are of varying sizes such as 1x630 mm 2, 4-core 120 mm 2, 4-core 150 mm 2, 4-core 185 mm 2 and 4-core 240 mm 2. In new planned areas, the LT network will be of underground cables only to comply with the Undergrounding Policy. A total length of km of underground cable up to August 2016 is very likely to increase with steep trend more than the previous years Protection Low tension feeders are protected with HRC fuses at the feeder pillars or cutout boxes. 5. Operating Voltage The following Table 5 shows MZEC s operating voltages. Table 5: MZEC s operating voltages Normal System voltage Highest voltage voltage Allowable tolerance 415/240 V - 415/240 V ± 6% 11 kv 12.5 kv 11.5 kv ± 6% 33 kv 36 kv 33 kv ± 6% 6. Load Management Areas During the normal operation of the distribution system, there are no areas of MZEC distribution network affected by load management scheme. Load management schemes will be employed for the Demand Control. The need for reduction in Demand arises in situations of insufficient Generation Capacity and where severe operating difficulties pose a threat to the stability of the Main Interconnected System including the security of the Distribution System. Mazoon Electricity Company SAOC Page 18

27 7. Other Interconnected Networks The main interconnection with other networks is with OETC system via grid supply point substations. These are eight grid substations in South Al Batinah namely Barka Main, Al Sawadi, Muladah, MIS, Rustaq, Nakhal, Khdrah and Khabourah and seven grid substations in Al Dakhilyiah namely Nizwa, Madinat Nizwa, Bahla, Izki, Sumail-A, Sumail-B and Adam, two grid substations in South Al Sharqiyah namely Sur, Jalan BB Ali, and three grid substations in North Al Sharqiyah namely Mudhairib, Ibra and Mudhaibi. Interconnections on the 33 kv and 11 kv voltage level are with Majan Electricity Company and Muscat Electricity Distribution Company. The 33 kv interconnections with Majan Electricity Company and Muscat Electricity Distribution Company are mainly alternative supply sources in emergency situations. At some locations, MZEC has Interconnection with the Ministry of Defence (MOD) which serves mainly for the import and export of energy which depends on the condition of the demand. 8. The 33 kv System Load Flow Study 8.1 Introduction A load flow study is necessary to verify that the electrical system has the adequate capacity to supply the connected load. In distribution systems, load flow studies are performed to determine the steady-state operation of the distribution system. A load-flow study calculates the voltage drop on each feeder, the voltage at each bus, and the power flow in all branch and feeder circuits. Losses in each branch and total system power losses are also calculated. Normally, load flow studies determine if system voltages remain within specified limits under various operating conditions, and whether equipment such as transformers and conductors are overloaded. Load flow studies are often used to identify the need for additional generation, capacitive, or inductive VAR support, or the placement of capacitors and/or reactors to maintain system voltages within specified limits. Commonly, load flow studies are carried out to investigate: 1) Bus Voltage Profiles 2) Real and Reactive Power Flow 3) Power System Losses 4) Proper Transformer Tap Settings A load flow study was conducted on MZEC s 33 kv distribution system. 8.2 Purpose of the Study This load flow analysis is carried out in accordance with the requirements of Condition 32: Distribution System Capability Statement of our Distribution and Supply License and the Distribution Planning Code DPC.4.4 (Three Capability Statement). It is intended to study and analyze MZEC s 33 kv distribution system from the planning and operation points of view. 8.3 The 33 kv Distribution Network MZEC s 33 kv distribution network is composed of four isolated networks: Mazoon Electricity Company SAOC Page 19

28 1) Al Dakhilyiah Distribution Network 2) North Al Sharqiyah Distribution Network 3) South Al Sharqiyah Distribution Network 4) South Al Batinah Distribution Network Each of them is fed from the 132/33 kv or 220/33 kv Grid Stations, where 33 kv outgoing feeders are radiated to feed the 33/11 kv primary indoor and outdoor substations in addition to few pole mounted 33/0.433 kv transformers. 8.4 The Load Flow Analysis The starting point of the load flow analysis is the existing 33 kv networks of the four governorates in summer Using ETAP software, load flow for the Loading Category Summer 2016 was conducted, using the measured loads of summer 2016, for the four governorates, Al Dakhilyiah, Al Sharqiyah (South and North) and South Al Batinah separately. In this study, the measured 11 kv currents which were measured in the 11 kv feeders of substations were used to carry out this study. As the purpose of the present load flow analysis is to assist preparing MZEC s Capability Statement for the period , the measured loads were used as the basis for the studies in 2017, 2018 and The load flow study was conducted for the Loading Category Summer 2017 as a load projection of summer 2016, Loading Category 2018 projected from summer 2017 and Loading Category 2019 projected from summer The results of each study phase (Loading Category) were analyzed in relation to equipment s loading and voltage magnitudes at the 33 kv and 11 kv buses. Equipment with overloading and bus bars with under voltages were identified. The network reinforcement required to relief the overloaded equipment and improve the voltage profiles are proposed and the networks of the four governorates are modified accordingly and a new load flow study is conducted. Complete and Summary reports for each region are available on request. 8.5 Presentation of Results and Single Line Diagrams for the s For simplicity and ease of understanding, the results of the load flow analysis are regenerated in MS Excel spread sheets in the annexure listed below. 1) Annexure 1-A-1: Al Dakhilyiah Equipment Loading (Primary Substations) 2) Annexure 1-A-2: Al Dakhilyiah Equipment Loading (33 kv Feeders) 3) Annexure 1-B-1: South Al Sharqiyah Equipment Loading (Primary Substations) 4) Annexure 1-B-2: South Sharqiyah Equipment Loading (33 kv Feeders) 5) Annexure 1-C-1: South Al Batinah Equipment Loading (Primary Substations) 6) Annexure 1-C-2: South Al Batinah Equipment Loading (33 kv Feeders) 7) Annexure 1-D-1: North Al Sharqiyah Equipment Loading (Primary Substations) 8) Annexure 1-D-2: North Al Sharqiyah Equipment Loading (33 kv Feeders) The single line diagrams for the years 2017, 2018 and 2019 are available on request. 9. The 33 kv Short Circuit Analysis It is normally understood by the short-circuit calculation, the calculation of the characteristic shortcircuit quantities. Namely, Initial Symmetrical Current, Peak Current, Breaking Current and the Mazoon Electricity Company SAOC Page 20

29 Steady State Current. These currents can produce considerable thermal and mechanical stresses in electrical distribution equipment. The faults causing these current interrupt the system s steadystate operating condition and may lead to instability, loss of synchronism and outages. Their calculation is a perquisite in system design, planning and operation to ensure that the system components are properly selected to withstand these abnormal currents and the protective devices are capable to detect and interrupt them. Proper interruption of these currents will protect the personnel, public, animals as well as the equipment. The Short Circuit Study is conducted on Mazoon s 33 kv distribution network as part of its Three Capability Statement in accordance with the requirements of Condition 32 of MZEC Distribution and Supply License. The short circuit study is carried out on the Mazoon s three 33 kv networks for the years using ETAP. In the study, only load connected buses are short circuited i.e. 33 and 11 kv busbars excluding nodes. The results showed that all the short circuit currents are below the equipment rating in all governorate. For simplicity, only the 3- Fault Currents for the years 2017, 2018 and 2019 are shown. These are presented in Annexure 2-A-1, 2 & 3, 2-B-1, 2 & 3, 2-C-1, 2 & 3 and 2-D-1, 2 & 3 for the four governorates Al Dakhilyiah, South Al Sharqiyah, South Al Batinah and North Al Sharqiyah respectively. 10. Voltages Non Compliance Non-compliance towards the voltage standards is presented for the 33 kv busbars at the primary substations only. The voltage non-compliance observed at the 33 kv busbars is not affecting the voltage at the 11 kv busbars, due to the existence of the tap changers. Due to the fact that the majority of MZEC customers are connected at the LV network, there is no clear and reliable information on the number of voltage non-compliances at the customer premises. However, MZEC keeps records of customer complaints and take them into consideration while carrying out the reinforcement programs. The partial incorporation of 11kV modeling into the upcoming Capability Statements will provide a better picture on the status of voltage at the customer side. Having said all of the above, it is worth mentioning that at peak hours the voltage at the grid substations falls beyond the normal operating value. The voltage non-compliances are shown in Annexure VD-A-1, 2 & 3, VD-B-1, 2 & 3, VD-C-1, 2 & 3 and VD-D-1, 2 & 3 for the four governorates Al Dakhilyiah, South Al Sharqiyah, South Al Batinah and North Al Sharqiyah governorates respectively for period However, we are maintaining the voltage level at 11 kv through the capacitors and Transformer tap changer, so that the voltage with distribution user are maintained within ±6%.The proposed reinforcement projects will relief the distribution system components and consequently, the voltages at the non-compliant buses will be improved. The additional capacitive capacity will bring the power factor at the primary level within the range of (0.95 lagging to 0.95 leading) specified in the Distribution Code and Grid Code and help keeping the voltage within ± 6%. Furthermore, the reduction of the reactive current flowing in the 33 kv network for long distance will reduce the distribution losses. 11. Distribution System Security Standards (DSSS) After the approval of Distribution System Security Standards in November 2008 as shown in Table 6 below, MZEC is obliged to comply with the Planning requirements of Security Standards. Since the grant of MZEC s Distribution and Supply License, MZEC has started planning its distribution Mazoon Electricity Company SAOC Page 21

30 network to comply with simple planning principle to supply its customers with a high quality product. The starting point was the purchase of high quality power system analysis software, namely Electrical Transient Analysis Program (ETAP), for the analysis of its distribution system. The 33 kv networks of the four governorates namely Al Dakhiliyah, Al Sharqiyah (South and North) and South Al Batinah were drawn in the ETAP as early as 2006 and MZEC presented its first Three Capability Statement with the aid of this powerful software. The results obtained from the ETAP encouraged MZEC to purchase another three Licensees for its 11 kv networks and also upgraded the original version. Table 6: Distribution System Security Standards DEMAND CLASS Initial System Conditions First Outage (Forced Outage) Second Outage (Planned Outage + Forced Outage) A Less than 2 MW Repair time No requirement B 2 to 6 MW 3 Hours No requirement C 6 to 20 MW Within 15 minutes Restoration time of planned outage D 20 to 100 MW Immediately Restoration time of planned outage E Greater than 100 MW Immediately Immediately, 2/3rds of demand The load flow study carried out on the 33 kv networks of the four governorate showed compliances and non-compliances towards Distribution System Security Standards for the 33 kv feeders and the 33/11 kv substations. The study is based on the measured currents of the 33/11 kv substations in summer 2016 for the load category The results of the study for the three years were analyzed against the security standards for the feeders and the substations for each governorate separately. The 33 kv feeders and 33/11 kv substations that are not complying with the Distribution System Security Standards (DSSS) are presented in a tabulated form of prospective security derogation lists. According to the Security Class, a 33 kv feeder is considered not complying with the standards if, upon a fault on the feeder the Demand Group cannot be supplied within the prescribed period of time. Where a portion of the feeder cannot be fed back, the feeder is considered and classified as non-compliant. For the 33/11 kv substations, two situations are of interest. In the first case, if two transformers are installed in a substation but the total load is greater than the capacity of one transformer, then the substation is considered non-compliant. The second situation is where only one transformer is installed and there is no link to a nearby substation that can take the affected demand group, then the substation is considered non-compliant. It is worth mentioning that the noncompliance is only during the summer period. For most of the year many feeders and substations are compliant with the DSSS except the radial feeders, T-Offs and substations with only one installed transformer. All investments in MZEC Network are to make all substations compliance with DSSS. Mazoon Electricity Company SAOC Page 22

31 12. Demand Forecast 12.1 Introduction MZEC s annual peak demand forecast is the essential first value of input into development plans. Annual peak demand is the highest rate of energy demand across the course of a year. By monitoring and planning for peak demand, MZEC ensures the distribution networks maintain the ability to provide a reliable supply under the most strenuous load demand conditions. MZEC is monitoring and reviewing the peak demand annually to ensure: Identify the change of load trends. Looking for the impact of increasing load to the customer especially Industrial and commercial. Development of the efficient network expansion plans to match the demand forecast and support economic development. Observation of annual peak load ensures the most recent information and country development are considered when forecasting the expected impact on each individual substations and the total system peak for the main interconnected system. For each substation, separate measure are used to determine the substation peak load and the substation load at the time of the total system peak load as each of these peak loads may not occur at the same time or have the same drive. Moreover, the detailed geographical level of substation allow distribution planning to identify demand growth in the area. MZEC is one of the areas rapidly developing in Oman. Because the government provides the basic infrastructure in this areas, so the people are encouraged to invest and build in MZEC areas especially in South Al Batinah Governorate which is the most densely populated governorate in the Sultanate. Next table shows the percent growth from 2008 until It s obviously the percent of growth increased rapidly in 2011 and 2012 and the sharp drop in load growth in 2010 was due to adverse weather conditions. Table 7: MZEC peak load Peak load MW % Growth It s expected to increase the load for upcoming years. Because MZEC recognized non ordinary growth driven by considerable number of governmental investments in form of tourism projects, infrastructure projects, and industrial projects as well as private sector investments accompanying them. Also, Ramadan start moving into summer months and the requirement for air condition will be high. Mazoon Electricity Company SAOC Page 23

32 12.2 Load Curves To give a general view of the load behavior, the load profiles for MZEC taken at Sunday 10 th July 2016 which is the day of MZEC Peak was plotted and presented in Figure 1 below. The highest load was reached at 15:00 hours due to in this hour most of the people returned to their houses to take rest after duty time, in this day the load recorded was 1975 MW Figure 1: The Load Profile of MZEC Similarly, a weekly load profile covering the period from 7 th July to 13 th July 2016 was plotted in Figure 2 to show the load behavior of MZEC load in a typical week of the year. The selected week included MZEC peak day. It is obvious that the load during weekend slightly less than that during normal days. MW Daily Load Carve Hours Mazoon Electricity Company SAOC Page 24

33 MW MW Distribution System Capability Statement Weekly Load Profile (7 July - 13 July 2016) Max Load MW Min Load MW Figure 2: Weekly Load Profile To complete the picture, the yearly load profile for year 2016 until October was also plotted in Figure 3. The yearly load profile was obtained from plotting the highest reading in each month to from the Maximum load profile for the entire MZEC System as well as for each governorate MZEC Max Load MW North Sharqiyah Max Load MW South Sharqiyah Max Load MW Dakhiliyah Max Load MW South Batinah Max Load MW Months Figure 3: MZEC ly Load Profile 2016 (Jan-Oct) Mazoon Load curve follows a typical load behavior in hot countries as the peak period is in summer season that starts approximately in April and ends in September. It can be also of importance to notice that MZEC Peak is almost three times its minimum load recorded in off peak period during January and February. The demand side management need to consider this issue to minimize the Mazoon Electricity Company SAOC Page 25

34 gap between peak period and off peak period which no doubt will result on savings at generation, transmission and distribution systems. As can be seen from the graph of Figure 3, that South Al Batinah Load represent the highest load among the all the governorates followed by Al Dakhilyiah and Al Sharqiyah (South + North) governorate. Furthermore, Figure 4 below presents the Maximum load at the governorates in MZEC for the last ten years that does not necessarily happened in the same day of MZEC peak Figure 4: Regional Individual Maximum Load It is obvious from Figure 4 above that South Al Batinah governorate despite the fact that it is the smallest one among the other governorates in terms of area; it is the highest in terms of Load. From 2007 to 2009 there were gradual increases in the growth of the three governorates. However, in year 2010 the recorded peaks are slightly lower in South Al Batinah than that of 2009 whereas it decreased in the other two governorates largely. The difference is remarkable for Al Sharqiyah (South and north) followed by Al Dakhilyiah. The main cause for this was the impact of the cyclone that hit Al Sharqiyah (South and North) governorates and consequently reduces the temperature starting from June onward. After 2010 the load growth returned to grow gradually for the three governorates with higher rate of growth in South Batinah. MW Dakhiliyah Sharqiyah South Batinah s Mazoon Electricity Company SAOC Page 26

35 12.3 Demand forecast Methodology This section covers the forecast methodology and the results of MZEC s forecast of energy demand expressed in Regulated Units Distributed (RUD) and customer accounts (CA) for The demand forecast is a fundamental driver of the subsequent forecasting of Price Control 4 (PCR4). Crucially the forecast makes a distinction between autonomous demand growth and that due to corporate projects. Autonomous demand growth: driven by the year-on-year increase in the number of customer accounts and in the regulated units distributed which are derived from the increase in the population within the MZEC service area and GDP per capita. Even with uncertainty and statistical errors that occur in the source data, it is reasonable to suppose that both drivers will grow at a fairly predictable rate that reflects the immediate past history of its actual growth. Corporate projects: Customer accounts and especially distributed energy will also increase as a consequence of significant, large-scale developments referred to as corporate projects. The timing and impact of the corporate projects on MZEC s network is difficult to predict as such projects constitute a variety of national initiatives influenced by national and international factors, developers priorities and timescales, and other factors outside of MZEC s control and reasonable forecasting practices. Corporate projects at completion typically add a one-off increase in the number of customer accounts (large or small, according to their nature) and in the units distributed (which may then have its own annual growth rate as the development matures). MZEC bases its forecast of the impact of corporate projects on a mix of historical trends, current developments, and communication with developers and the government. Autonomous Demand Growth The forecast of autonomous demand growth is based on an econometric model developed for the Price Control 3 (PCR3) submission, using the latest available data on population growth and economic (GDP per capita) growth in Oman. Both factors are key drivers for the increase in customer accounts as well as the average energy consumed per customer account. International studies show a significant positive correlation between GDP per capita and average energy consumption per capita. As the GDP per capita of a country rises, private households are able to afford more electrical appliances, and industrial and commercial enterprises replace labor with capital. The link between population growth and the number of customer accounts is self-evident. MZEC s confidence in the robustness of this econometric model has been reinforced by the good agreement between its forecasts made for PCR3 and the actual outturn in number of customer accounts and units distributed in 2011 to The input data used in the forecast is as follows: 1. Population data for the area served by MZEC has been taken from data published by the Oman Information and Statistics Center 1 ; and 2. Data and projections on Oman GDP economic development are taken from data published by the International Monetary Fund in its World Economic Outlook Database published Jan published Jan 2014 Mazoon Electricity Company SAOC Page 27

36 The raw statistical data requires to undergo a number of transformational steps before it is translated into RUDs and CAs. An increase in population in the MZEC area does not produce a proportionate increase in the number of customer accounts, nor does an increase in GDP per capita result in a pro rata increase in average energy consumption. To translate the projected population growth and increase in GDP into a forecast of the increased number of customers served and their average electricity consumption, MZEC applies the economic concept of elasticity: the percentage change in one variable caused by the percentage change in another variable. The forecasting model that MZEC uses computes the values of population/customer-accounts elasticity and GDP-percapita/energy-consumption elasticity from historic data for each of the customer categories (Residential, Commercial, Government, Agriculture & Fisheries, Industrial, Tourism, and Ministry of Defense). The model then applies these factors to generate a forecast of customer accounts and energy distributed in each category for each year of PCR4. MZEC also takes account of the time lag in customer response: MZEC obtains the most likely fit when assuming that changes in the number of customer accounts, and in average energy consumption, lag by one year on changes in population and GDP per capita. This approach is well correlated to the population and GDP data for the first four customer categories, but not so well for Industrial, Tourism and Ministry of Defense. These are more heavily influenced by the expected incidence and magnitude of corporate (special) projects. Our approach to forecasting demand in these categories is described in the following section. The results obtained from the econometric model are very dependent on the accuracy and consistency of the data inputs. The raw data on population from the Oman Information and Statistics Center contains an adjustment in years (see figure below), with a consequent effect on the GDP per capita. MZEC considers this introduces a discontinuity which could affect the accuracy of the model s predictions. MZEC therefore examined the historic trend in customer accounts and units distributed and extrapolated this to the PCR4 period to guide our interpretation and application of the model results. Figure 5: Oman ISC population statistics , extrapolated to 2019 Mazoon Electricity Company SAOC Page 28

37 Corporate Projects/Customers: MZEC classifies as Corporate Projects those developments known to MZEC as of December 2014, where the developers or prospective customers have indicated their intention to connect substantial new loads to the MZEC network. These have an effect on the load expected to be distributed in the period of the PCR4 price control, of a magnitude and incidence that is difficult to anticipate, dependent as it is upon the independent decisions of developers and major customers which are in turn subject to a variety of factors. The additional number of customer accounts involved in these projects can be quite small, but the increase in energy consumed can be very substantial with a significant impact on the total energy distributed to these categories, e.g. the Industrial, Tourism, and Ministry of Defense (MoD) sectors. For these three categories, MZEC may reasonably assume absent any indications to the contrary that existing demand (as of end-2014) will not exhibit significant autonomous growth (existing tourist facilities will maintain their occupancy level and hence energy consumption, as will MoD facilities; existing industrial plants will operate at the current level of production). The volume and timing of demand growth in the Tourism and Industry categories depends on national and international economic developments as well as decisions by individual investors. MoD expansion of new facilities is mostly driven by political decisions internal to Oman. MZEC is therefore only able to forecast demand growth due to those industrial, tourism or MoD projects known to MZEC as of December 2014, that are expected to be connected during the PCR4 price control period. Other corporate projects known to MZEC are in the Residential (such as the South Al Batinah Coastal Area Residences), Commercial and Government categories (there is none in the Agriculture and Fisheries category). Whilst not negligible, these projects will add a relatively small increase to the number of customer accounts and units distributed in these already very large customer categories. The number of all such projects, their incidence and nominated peak demand expected in the Capability Statement period are: Table 8: Peak Demand in MW of Corporate Projects by Customer Category expected in Customer category Number of Peak Demand (MW) projects Residential Government Commercial Industrial Agriculture Tourism MOD (Defense) Our forecast of the number of customer accounts and the units distributed under these corporate projects is based on the prospective connection data made available to MZEC by the project developers. Using their project timetable and their nominated MW capacity or peak demand, the MZEC Planning Department: Mazoon Electricity Company SAOC Page 29

38 1. Reviews and analyses, discuss and validate the requests with the developers to arrive at reasonable values of total connected load; and 2. Estimates their coincident after diversity and load factor (CADLF) energy consumption using diversity and load factors determined from comparable historic data in the MZEC area and from corresponding data in comparable countries. Whilst MZEC recognizes the inherent uncertainty introduced to the demand forecast by basing special project figures on the developers own proposed timetable and capacity requirements, MZEC is reasonably confident that adding these estimates to the values produced by our econometric model introduces a negligible error to the forecast of customer accounts and energy distributed in the PCR4 price control period. To generate the growth per feeder and per substation, data of all connected load was gathered for the 2 years that covers all tariff categories (Residential, Governmental, Industrial, Agriculture and Commercial). Then using the historical MW at each feeder and substation and the estimates their coincident after diversity and load factor (CADLF) energy consumption using diversity and load factors determined from comparable historic data in the MZEC area and from corresponding data in comparable countries see table below, percentage growth per feeder was determined. The process took into account the weight of each individual tariff category to ensure that robust estimate growth is accurately calculated. Table 9: MZEC coincident after diversity and load factor Tariff category Residential Government Commercial Industrial Agriculture Coincident Factor 60% 40% 60% 80% 30% Currently, MZEC are developing a new demand forecast model with a consultant company. The new model is depend on the econometric analysis method. Econometric models look at the relationship between energy demand by sector and various economic factors, such as GDP per capita, and perform a regression analysis to estimate the parameters that link the inputs with demand (known as elasticities). The objective is to identify the correlation between historical consumption and macroeconomic and demographic parameters. The model will include a huge data from internally and externally departments. MZEC plan to finalize the model by the end of this year and it will be used in next capability statement and price control Strategic Development Statement for Al Dakhilyiah Governorate Al Dakhilyiah Governorate is Located at the center of the Sultanate of Oman and from the geographical point of view is a combination of different terrains of mountains, lowlands and Wadies. It consists of the Wilayats of Bahla, Al-Hamra, Nizwa, Adam, Manah, Izki, Sumail and Bidbid. The electrical network is managed by five offices that are Nizwa (responsible of Nizwa and Manah), Bahla (responsible of Bahla and Al-Hamra), Sumail (responsible of Sumail and Bidbid), Adam and Izki districts. The governorate has seen a growth in demand especially around the areas, i.e. Nizwa, Mazoon Electricity Company SAOC Page 30

39 Bahla and Sumail due to natural human developments and new industrial and housing expansions. The governorate experiences an industrial customer s growth represented mainly by the new Industrial Estate in Sumail and the expansions of the already existing Nizwa Industrial Estate Existing Capacity at Grid Substations The available capacity in each grid station in Al Dakhilyiah Governorate out of the firm capacity of the grid is shown in Table 10 below. Four new grid stations will be added in Al Dakhilyiah Governorate three of them will be commissioned during this capability statement period namely Birkat Al Mouz, Jibreen and Izki-2 2x125 MVA. The other one will be commissioned in five year time which is Sumail Industrial Estate. Furthermore of these new grids, Adam grid will upgraded from 2x40 MVA to 2x125 MVA. These new grids will improve the security of the 33 kv feeders of the area in which they will be constructed. The load of the 132/33kV Grid substations is shown briefly in the next table. Table 10: Grid Substations load at Al Dakhilyiah Governorate Name Capacity Firm Load (MVA) Remarks MVA Capacity (MVA) Nizwa 2x In 2019 Some load will be transferred to Birkat AL Mouz Madinat Nizwa Birkat AL Mouz 2x x Bahla 2x Jibreen 2x In 2017 Some load will be transferred to Jibreen Izki 2x In 2017 and 2018 some load will be transferred to Izki-2 Izki-2 2x Sumail-B 2x Sumail-A 2x Mazoon Electricity Company SAOC Page 31

40 Adam 2 x In 2019 will be upgraded by OETC to 2 x125 to provide sufficient secure capacity Reinforcement of the Nizwa Area The area of Nizwa is the highest growing area among the Districts of Al Dakhilyiah Governorate because the density of population in Nizwa is very high compared to other districts. In addition, Nizwa is considered as the center of the Governorate and many new governmental constitutions and industrial establishments are constructed in Nizwa. Nizwa area feed from two existing grids which are Nizwa Grid and Madinat Nizwa Grid which is commissioned in One new grid will be add during this capability statement period. This new grid located close to New Building of Nizwa University and will take some load from Nizwa Grid. 2017: A) The projects associated with Nizwa Grid In 2017 only one new 33kV feeder will be energized which called ROP feeder from Nizwa Grid to feed Timsa and Rop Academic substations. These substation will be upgraded in the coming year as illustrated in the coming sections. B) The projects associated with Madinat Nizwa Grid The following projects will be associated with the construction of Madinat Nizwa Grid: Upgrading of Hay Al Ain substation from 2x6 MVA to 3x6 MVA to share the its load and it will feed from Hay AL Ain-1 33kV feeder. In 2017 one new 33 kv will be constructed to feed this substation. Upgrading of Kamah Substation to 2x20 MVA to cover load growth in the area and to comply with DSSS requirements. Also, one new 33 kv will be energized in this year to feed this upgraded substation and Tanuf 2x6 MVA. Table 11: Projects Associated with Reinforcement of the Nizwa Area in 2017 (Madinat Nizwa) No. Project Description Start 1 Upgrading of Hay Al Ain to 3x6 MVA with two new 33 kv feeders 2 Upgrading of Kamah Substation to 2x20 MVA with one new 33 kv feeders 2018: End Reference PIAD Q DH-1/2012 Q DH- 04/2013 Mazoon Electricity Company SAOC Page 32

41 In this year, the following projects are expected to be in service: New 33 kv feeder will constructed from Madinat Nizwa to Hay AL Ain to provide the backup feeding for Hay AL Ain. New 2x20 MVA substation is proposed to be constructed in Jebel Al Akhder area to provide a secure supply for the very important tourism area. Also, one new 33 kv feeder will be constructed this feeder will go directly to Jebel Al Akhder and will feed Wadi Moaiden which will upgraded to 2x3 MVA in Upgrading Timsa substation to 2x20 MVA and installation of a second 33 kv circuit from Nizwa Grid S/S to Timsa S/S by a length of 5 km overhead line and 600m 3Cx300 mm 2 underground cable. Table 12: Projects Associated with Reinforcement of the Nizwa Area in 2018 No. Project Description Start End Reference PIAD 1 New 33 kv feeder from Madinat Nizwa to Hay Al Q DH-1/2012 Ain 2 New 2x20 MVA substation is proposed to be constructed in Jebel Al Akhder area Q DH- 02/ Upgrading Timsa substation to 2x20 MVA Q DH- 08/ : In this year, the following projects are expected to be in service: Construction new Grid in Birat Al Mouz with capacity of 2x125 MVA to relive Nizwa grid and take load of Nizwa University. This grid will feed 4 substation in this year. Connection of new 2x20 MVA in Hay Al Turath substation. This new primary is proposed to relieve load from Stadium and Nizwa Town substations. After shifting load from these substation to Hay Al Turath Primary all of them will be complied with DSSS. Construction of new Nizwa Town-2 with capacity of 2x20MVA to relief Nizwa Town primary and construct new 33kV feeder from Madinat Nizwa to feed it and link from Nizwa Town feeder -1 to be as backup supply. Upgrading Izz substation from 1x6 MVA to 2x10 MVA indoor substation and feed from Hisn Al Shomukh 1&2 from Nizwa Grid. Izz substation will be complied with DSSS after upgrading. Mazoon Electricity Company SAOC Page 33

42 Table 13: Projects Associated with Reinforcement of the Nizwa Area in 2019 No. Project Description Start 1 Construction new Grid in Birat Al Mouz with capacity of 2x125 2 Construction of new 2x20 MVA Hay Al Turath substation 3 Construction of new 2x20 MVA Nizwa Town-2 substation 4 Upgrading Izz substation from 1x6 MVA to 2x10 MVA indoor substation Reinforcement of Bahla Area End Reference PIAD Q DH- 08/2013 Q DH- 08/2013 Q DH- 04/2013 Q DH- 08/2013 The area of Bahla District has witnessed high load growth in some substations especially in the substation supplying the center of district like New Bahla 2x20 MVA and Bahla primary 2x20 MVA which have been growing in demand by 18% and 13 % annually. There are a lot of project proposed for this district during the coming three year to meet the load growth and to ensure the compliance of the network to DSSS requirements. 2017: The following projects are proposed for this year: Construction of a new 2x20 MVA primary substation at Mamorah area to share the load with the existing 2x20 MVA substation. The new substation will be fed by two new feeders each one about 4 km underground cables from Bahla Grid. Upgrade Bisya substation from 2x6 MVA to 3x6 MVA to increase the firm capacity of this substation to be 12 MVA and the upgrading of this substation will ensure the compliance with DSSS. Construction of Jibreen Grid station to relief Bahla Grid station and take some loads from Adam Grid. And construction 8 33 kv feeders to feed Bisya, Wadi Quriyah, AL Bidooa and New Bahla substations. Table 14: Projects Associated with Reinforcement of the Nizwa Area in 2017 No. Project Description Start End Reference PIAD 1 Construction of new 2x20 MVA Al Mamorah substation Q DH- 08/ Construction of New Jibreen Grid Q DH 09/2012 Mazoon Electricity Company SAOC Page 34

43 3 Upgrading Al Habi substation from 2x10 MVA to 2x20 MVA Q DH 09/ : The following projects are proposed for this year: Construction of a Temporary 2x6 MVA substation in Al Hamra until the new substation will commission in the next year. And two new 33 kv feeders each one about 9 km underground cable and 5 km overhead line. This new primary will relieve load of Al Hamra 2x20 MVA and Bilad Sait 2x6 MVA substations. Upgrading Al Habi substation from 2x10 MVA to 2x20 MVA to be comply with DSSS requirements. Table 15: Projects Associated with Reinforcement of Bahla Area in 2018 No. Project Description Start 1 Construction of temporary 2x6 MVA substation in Al Hamra with 2 new 33 kv feeders 2 Upgrading Al Habi substation from 2x10 MVA to 2x20 MVA Q Q Reference PIAD 2018 DH 07/ : The following projects are proposed for this year: Construction of a new 3x20 MVA substation in Al Hamra. This new primary will relieve load of Al Hamra 2x20 MVA and Bilad Sait 2x6 MVA substations and take all load of AL Hamra Temporary. Construction new Jibreen 2x20 MVA substation primary to be feed from jibreen grid by two new 33kV feeders each feeder is 2 km underground cable. Table 16: Projects Associated with Reinforcement of Bahla Area in 2019 No. Project Description Start 1 Construction of a new 3x20 MVA substation in Al Hamra. 2 Construction new Jibreen 2x20 MVA primary substation Q Q Reference PIAD 2018 DH 09/ DH 07/2013 Mazoon Electricity Company SAOC Page 35

44 Reinforcement of Izki Area Izki area is one of the slightly grown area and it feed from one existing Grid with capacity of 2x125 MVA and in 2017 another Grid station will commission in this area to relive the existing grid load. Some of the 33 kv feeders proposed to be constructed out of Izki Grid to serve Nizwa District, these projects has been mentioned in the section discussing the development of Nizwa. The development of Izki District for the coming three years is as following: 2017: The following projects are proposed for this year: Construction of new Izki-2 Grid in Qalat AL Awamer Area with Three new 33 kv feeders to feed MOD Izki. MOD Shafia and AL Aqil substations. Construct Temporary 2x6 MVA substation in Izki Highet to relive load from Izki Grid Primary substation until Izki Highet 3x20 MVA will commission in next year. Upgrading Humaidha substation to 3x6 MVA to insure the compliance with DSSS. Upgrading Al Aqil substation from 1x6 MVA to 2x6 MVA to ensure the compliance with the security standards and to supply the growth in the area of Al Aqil. Table 17: Projects Associated with Reinforcement of Izki Area in 2017 No. Project Description Start 1 Construction of New Izki-2 Grid with 3 new 33kV feeders 2 Construct Temporary 2x6 MVA substation in Izki Highet 3 Upgrading Humaida substation from 2x6 MVA to 3x6 MVA 4 Upgrading Al Aqil substation from 1x6 MVA to 2x6 MVA Q Q Q Q Reference PIAD 2017 DH-5/ DH- 5/ DH- 5/ : The following projects are proposed for this year: A new primary substation is proposed to relieve Izki primary in an area called Izki Highet. This substation will be 3x20 MVA and will be fed by three 33 kv feeders from Izki-2 grid each one 5 km 3Cx300 mm 2 underground cable. Mazoon Electricity Company SAOC Page 36

45 Construction New 2x20 MVA in the same location of Al Jabal AL Akhdar substation with two new 33 kv feeder fed from Izki Grid. This substation will relive load from existing substation and take the load of the new bulk load. Upgrade Wadi Maiden to 2x3 MVA to insure the compliance with DSSS. Construction New Sayma substation with capacity of 2x6 MVA to relive syma temporary 1x6 MVA and insure the compliance with DSSS. Table 18: Projects Associated with Reinforcement of Izki Area in 2018 No. Project Description Start 1 Construction of Izki Highet 3x20 MVA with three 33 kv feeders 2 Construction New 2x20 MVA in the same location of Al Jabal AL Akhdar substation with two new 33 kv feeder Q Q Upgrade Wadi Maiden to 2x3 MVA Q Construction New Sayma substation with capacity of 2x6 MVA Q Reference PIAD 2018 DH-4/ DH- 02/ DH- 02/ DH-5/ : The following projects are proposed for this year: Construction new 2x20 MVA substation called Al Afiyah close to Wosad substation to relive Wosad substation and take all load of AL Afyah 1x6 MVA temporary substation. One new dedicated 33 kv feeder will be constructed from Izki Grid to feed this substation. And the backup feed from tapping point from Wosad 33 kv existing feeder. Upgrading Qalat Al Awamer substation from 2x6 MVA to 2x20 MVA to ensure the compliance with the security standards and to supply the growth in the substation area. And two new 33 kv feeder from Izki-2 Grid will be constructed. Table 19: Projects Associated with Reinforcement of Izki Area in 2019 No. Project Description Start 1 Construction new 2x20 MVA substation called Al Afiyah with one new 33 kv feeder from Izki Grid Q Reference PIAD 2019 DH- 05/2013 Mazoon Electricity Company SAOC Page 37

46 2 Upgrading Qalat AL Awamer substation from 2x6 MVA to 2x20 MVA with 2 new 33 kv feeder from Izki-2 Grid. Q DH- 5/ Reinforcement of Sumail Area The area of Sumail District has witnessed high load growth in some substations especially in the substation supplying the centre of the district like Sumail primary 3x20 MVA which has been growing in demand by 15% annually. The new Sumail Industrial Estate which is located near the Central Prison is expected to grow rapidly over the coming five years. The Industrial Estate will cover large area divided into two zones each one of them will be allocated for different types of industries. The new investors have been approaching Mazoon Electricity Company to apply for their new connections. Currently the area is fed by two 6 MVA transformers connected under Central Prison- 2. Thus, there are a lot of projects proposed for this district during the coming three year to meet the load growth and to ensure the compliance of the network to DSSS requirements as following: 2017: The following projects are proposed for this year: Construction of Al-Fayha 2x6 MVA substation with one new 33 kv feeder consists of about 0.5 km 3Cx300 mm 2 underground cable. The second source for this substation will be by constructing a new branch from the existing Jailah 33 kv feeder to Al-Fayha S/S. This new primary will relieve load of Jailah substation. Upgrade AL Hamim to 3x6 MVA to insure the compliance with DSSS. Upgrading Somrah substation from 2x6 MVA to 3x6 MVA and Wadi Mahram substation from 1x6 MVA to 2x6 MVA to meet the load growth and to ensure the compliance of the network to DSSS requirements. In this year, two main projects will be constructed to meet the new load in Sumail Industrial Estate as this area covers a large area divided into two zones each one of them will be allocated for different types of industries. These projects are: Construction of Sumail Industrial Zone-1 3x20 MVA substation with two new 33 kv feeders from Sumail Grid each one consists of 3 km 3Cx300 mm 2 underground cable and 8.25 km 200 mm 2 overhead line. This substation will be dedicated to supply the Zone-1 area. Construction of Sumail Industrial Zone-2 2x20 MVA substation with two new 33 kv branches from Sumail Industrial Zone-1 33 kv feeders. Each of these branches consist of 1 km 3Cx300 mm 2 underground cable. The substation will be dedicated to supply the Zone-2 area. Mazoon Electricity Company SAOC Page 38

47 Table 20: Projects Associated with Reinforcement of Sumail Area in 2017 No. Project Description Start 1 Construction of Al-Fayha 2x6 MVA S/S with one new 33 kv feeder and one branch from Jailah feeder Q Upgrade AL Hamim to 3x6 MVA Q Upgrading Somrah substation from 2x6 MVA to 3x6 MVA and Wadi Mahram substation from 1x6 MVA to 2x6 MVA 4 Construction of Sumail Industrial Zone-1 3x20 MVA substation with two new 33 kv feeders 5 Construction of Sumail Industrial Zone-2 2x20 MVA substation with two new 33 kv branches Q Q Q Reference PIAD 2016 DH 05/ DH 05/ DH 05/ DH 06/ DH 06/ : The following projects are proposed for this year: Construction of Hamim 33 kv feeder from Sumail Grid to Bidbid 2x6 MVA, Hammim 3x6 MVA and MOD Bidbid 1x6 MVA substations. The feeder will consists of 12 km 200 mm 2 overhead line and 3 km 3Cx300 mm 2 underground cable. 2019: The following projects are proposed for this year: Construction of Saih Al-Moaideen 2x20 MVA substation with two new 33 kv branches to feed the substation. The first branch from Surur 33 kv feeder consists of 2 km 200 mm 2 overhead line and 0.6 km 3Cx300 mm 2 underground cable and the second one will be from Multaqa 33 kv feeder and will be 3 km 3Cx300 mm 2 underground cable. This new primary will relieve load of Bidbid 2x6 MVA substation Reinforcement of Adam Area Adam area is located in the north of Nizwa and it have 2x40 MVA grid station with it will be upgrade it in This grid currently feed only four substation which are Metan, Al Basher, Al Zoubar and Adam grid primaries. In the coming years the following investment will be in Adam Area The projects proposed for the area of Adam are: Mazoon Electricity Company SAOC Page 39

48 Construction of new Al Zoubar s/s 2x20 MVA with two new 33 kv feeder each one about 6.5 km underground cable. This new substation will relieve load of Adam primary s/s 2x20 MVA. Upgrading Mitan to 2x6 MVA with one new 33 kv link to feeder Al Bashaer-2 this upgrading due to complex connection requirement. Table 21: Projects Associated with Reinforcement of Adam Area in 2017 No. Project Description Start 1 Al Zoubar 2x20 MVA with 2 new 33 kv feeders Q Upgrading Mitan to 2x6 MVA Q Reference PIAD 2017 DH 07/ Due to Complex Connection 13.2 Strategic Developments for North Al-Sharqiyah Governorate There are seven willayat in North Al Sharqiyah Governorate namely Wadi Bani Khalid, Bidyah, Al Qabel, Ibra, Dima & Tayeen, and Al Mudhaibi. The first six Willayats fall under the licensed areas of MZEC except some remote parts of Al Mudhaibi fall under Rural Areas Electricity Company Licensed areas as they are not connected to the Main Interconnected System MIS. MZEC provides its services to the customers of this Governorate through four Offices one in each of Willayats Dima & Tayeen and Al Mudhaibi in addition to Bidyah Office which serves Bidyah and Wadi Bani Khalid and Ibra Office which serves Wilayats Ibra and Al Qabel. The Governorate has seen a high growth in demand in most areas but especially around Mudhaibi and Ibra areas driven by the high growth of simple connections. In addition to that, there are some complex connection applications in this Governorate expected to be connected during the period covered by this capability statement Existing Capacity at Grid Substations The area is currently supplied from the following 132/33kV grid substations: - Mudhairib (2 x 125 MVA) Ibra (2x1205 MVA) Mudhaibi (2 x 125 MVA) The available capacity at the existing grid stations Mudhairib and Mudhaibi as well as for the new grids Sinaw and Samad in 2018 are shown in the table below. MZEC has recognized the requirement for grid capacity in this Governorate and has submitted applications to OETC for a new Sinaw, Samd and Bidiayah Grid stations to relief load from existing grids station as show in next table. Mazoon Electricity Company SAOC Page 40

49 Name Table 22: Available Grid Substation Capacity in North Al Sharqiyah Governorate Capacity Firm Load (MVA) Remarks (MVA) Capacity (MVA) Mudhairib 2x Some load will be transferred to Ibra in 2017 and to Bidiayah in 2019 Ibra 2x Mudhaibi 2x Some load will be transferred to Sinaw and Samad in 2018 Sinaw 2x Samad 2x Reinforcement of Mudhaibi Area To cover the high growth in Sinaw area, MZEC has submitted an application to OETC for a new grid supply point in Sinaw area. This new grid will relieve load of Mudhaibi grid. The associated 33kV switchgear is proposed under project. The new 33 kv feeders will ensure a better and more reliable 33 kv supply to existing and proposed substations and will improve compliance with Distribution System Security Standards. 2017: In this year the following projects are expected to be in service: Construct a new Sinaw-B 2 x 20 MVA primary substation at Sinaw to reduce the percentage load of Sinaw substation to the compliance with DSSS levels as well as to allow it to accommodate the growth experienced by the area. A new 33 kv feeder will be constructed which is Sinaw-4 to feed Sinaw-B PSS primary substation. Upgrading Lizq substation from 2x6 MVA to 3x6 MVA to cover the load in the lizq area. Upgrade the existing Khashaba primary substation from 2 x 6 MVA to 3 x 6 MVA with construction of one feeder from Mudhaibi Grid. Mazoon Electricity Company SAOC Page 41

50 No. 1 2 Table 23: Projects Associated with Reinforcement of the Al-Mudhaibi Area in 2017 Project Description Construction of new Sinaw-B 2 x 20 MVA primary substation Construction of new 33 kv feeders will be constructed (Sinaw-4). Start Q Q Reference SH- 05/ SH- 05/ Upgrading Lizq substation from 2x6 MVA to 3x6 MVA Two new 33 kv feeders will be constructed which are Khadra-2 and Samad-3 (with Temp 1x6 MVA Substation. Q Q SH- 05/ SH- 02/ Upgrade the existing Khashaba primary substation from 2 x 6 MVA to 3 x 6 MVA with construction of one feeder from Mudhaibi Grid. Q SH- 02/ : In this year the following projects are expected to be in service: Construction of New Primary 2x 20 MVA substation in Samad area with link to existing Samad-2. Construction of New Primary 2x 20 MVA substation in Khadra area with links to existing Khadra-1 and Khadra-2 feeders. Construction of the proposed Sinaw 132/33 kv grid station 2x125 MVA in with two 33 kv feeders to Sinaw substation, two 33 kv feeders to Sinaw-B substation and three 33 kv feeders to Aflaj area ( Aflaj SS, Al Oyoon SS, Qwauah SS and Al Jiza a SS). Construction of the proposed Samad 132/33 kv grid station 2x125 MVA in with two 33 kv feeders to Samad substation, two 33 kv feeders to New Samad substation and two 33 kv feeders to New Khadra Substations. Mazoon Electricity Company SAOC Page 42

51 No. Table 24: Projects Associated with Reinforcement of the Al-Mudhaibi Area in 2018 Project Description Start Reference 1 Construction of new Samad 2 x 20 MVA primary substation Q SH-02/ Construction of new Khadra 2x20 MVA primary substation Q SH-02/ Sinaw 132/33 kv grid station 2x125 MVA with 33 kv outgoing feeders Q SH-02/ Samad 132/33 kv grid station 2x125 MVA with 33 kv outgoing feeders Q SH-05/ : In this year the following projects are expected to be in service: Construction of new Saih Al Nama substation 2x20 MVA. This substation will relief load of Mudhaibi substation. No. 1 Table 25: Projects Associated with Reinforcement of the Al-Mudhaibi Area in Project Description Construction of new Saih Al Nama substation 2x20 MVA. Start Q Reference 2019 SH-05/ Reinforcement of Ibra Area Al Mudhairib Grid 2x125 MVA currently feeds five willayat and has long 33 kv lines which cause voltage drop at the network system in some remote areas. In addition, the loaded and lengthy 33 kv feeders increase the losses in lines. Ibra Grid 2x125 MVA was energized in June 2016 during summer period and it feed only Ibra-1 primary substation and it expected to relief load from Mudharib Grid before summer : In this year the following projects are expected to be in service: The construction of outgoing 33 kv deeders from Ibra Grid 2x125 MVA, two 33 kv feeders to Ibra-2 substation and two 33 kv feeders to Yahmadi area (Yahmadi SS, Khanadq SS, Al Hima SS and Al Hajir SS). Ibra will relieve load of Al Mudhairib Grid. Upgrading of Al Hajir substation from 2x3 MVA to 2x6 MVA. Mazoon Electricity Company SAOC Page 43

52 Upgrading of Al Hayma substation from 1x6 MVA to 2x6 MVA. Upgrading of Wadi Nam substation from 2x6 MVA to 3x6 MVA. Upgrading of Ibra-2 substation from 2x10 MVA to 2x20 MVA. No. 1 2 Table 26: Projects Associated with Reinforcement of Ibra Grid in Project Description Construction of outging 33 kv feeders from Ibra grid 2x125 MVA Upgrading of Al Hajir substation from 2x3 MVA to 2x6 MVA, Al Hayma substation from 1x6 MVA to 2x6 MVA, Wadi Nam substation from 2x6 MVA to 3x6 MVA and Ibra-2 substation from 2x10 MVA to 2x20 MVA. Start Q Q Q Q Reference SH- 03/2013 SH- 03/ : In this year the following projects are expected to be in service: Construction of new Yahmadi substation 2x20 MVA. This substation will relief load of Ibra-1 and Yahmadi substations. No. Table 27: Projects Associated with Reinforcement of Ibra Grid in 2018 Project Description Start Reference 1 Construction of new Yahmadi substation 2x20 MVA and construction of two new 33 kv feeders from Ibra Grid. Q SH-03/ Reinforcement of Wadi Tayeen Area Willayat Dima & Tayeen is fed from Mudharib Grid 2x125 MVA through two long 33 kv feeder and MZEC installed two boosters to rise the voltage. 2017: In this year the following projects are expected to be in service: Construction tow 33 kv feeders from Ibra Grid 2x125 MVA link with existing 33 kv Dima & Tayeen feeders, around 20 km, to improve the voltage. Mazoon Electricity Company SAOC Page 44

53 No. 1 Table 28: Projects Associated with Reinforcement of Wadi Tayeen Grid in 2017 Project Description Construction tow 33 kv feeders from Ibra Grid 2x125 MVA link with existing 33 kv Dima & Tayeen feeders. Start Q Q Reference : In this year the following projects are expected to be in service: No. 1 Upgrading Ghayadah substation from 2 x 6 MVA to 3 x 6 MVA. Upgrade Dima & Tayeen primary substation to 2x20 MVA. Table 29: Projects Associated with Reinforcement of Wadi Tayeen Grid in 2018 Project Description Upgrading Ghayadah substation from 2 x 6 MVA to 3 x 6 MVA. Start Q Reference SH- 04/ : In this year the following projects are expected to be in service: Construction Al Gubrah primary substation from 2 x 6 MVA to relief load from Dima & Tayenn primary substation and Sooqah primariy substation. No. 1 Table 30: Projects Associated with Reinforcement of Wadi Tayeen Grid in 2019 Project Description Construction Al Gubrah primary substation from 2 x 6 MVA. Start Q Reference SH- 04/ Reinforcement of Bidyah Area Al Mudhairib Grid 2x125 MVA currently feed willayat Bidyah and Wadi Bani Khalid and has long 33 kv lines which cause voltage drop at the network system in some remote areas. In addition, the loaded and lengthy 33 kv feeders increase the losses in lines. To cover the high growth in Bidyah and Wadi Bani Khalid area, MZEC has submitted an application to OETC for a new grid supply point Mazoon Electricity Company SAOC Page 45

54 in Bidyah area. This new grid will relieve load of Mudhairib grid and will improve the voltage in this area. 2017: In this year the following projects are expected to be in service: Upgrading Mintrib New substation from 2 x 20 MVA to 3 x 20 MVA Upgrading Wadi B Khalid substation from 2 x 6 MVA to 3 x 6 MVA. Upgrading Lawrange substation from 1 x 6 MVA to 2 x 6 MVA. Upgrading Hiyal substation from 1 x 6 MVA to 2 x 6 MVA with one feeder from Mudhirib Grid. No. 1 2 Table 31: Projects Associated with Reinforcement of Bidayah Area in 2017 Project Description Upgrading Mintrib New substation from 2 x 20 MVA to 3 x 20 MVA with one feeder from Mudhirib Grid. Upgrading Wadi B Khalid substation from 2 x 6 MVA to 3 x 6 MVA, Lawrange substation from 1 x 6 MVA to 2 x 6 MVA and Hiyal substation from 1 x 6 MVA to 2 x 6 MVA. Start Q Q Reference SH- 06/2013 SH- 06/ : In this year the following projects are expected to be in service: Construction of New Shariq Primary 2x 20 MVA substation in with links to existing Mintrib-1 and Mintrib-4 feeders. No. 1 Table 32: Projects Associated with Reinforcement of Bidayah Area in Project Description Construction of New Shariq Primary 2x 20 MVA substation Start Q Reference SH- 06/ : In this year the following projects are expected to be in service: Mazoon Electricity Company SAOC Page 46

55 Construction of the proposed Bidayah 132/33 kv grid station 2x125 MVA in with three 33 kv feeders to Mintrib substation, two 33 kv feeders to Shariq substation and two 33 kv feeders to Tawi Salim SS, Lawrang SS, and wadi Bani Khalid SS. No. 1 Table 33: Projects Associated with Reinforcement of Bidayah Area in 2019 Project Description Construction of the proposed Bidayah 132/33 kv grid station 2x125 MVA in with related 33 kv feeders Start Q Reference SH- 05/ Strategic Developments for South Al Sharqyiah Governorate South Al Sharqiyah Governorate consists of four wilayats namely Sur, Jalan Bani Bu Ali, Jalan Bani Bu Hassan and Al Kamil & Al Wafi. These Wilayats fall under the licensed areas of MZEC, except some remote parts of Jalan Bani Bu Ali, Jalan Bani Bu Hassan fall under Rural Areas Electricity Company Licensed areas as they are not connected to the Main Interconnected System MIS. MZEC provides its services to the customers of this Governorate through three Offices. Sur office services Sur area and Jalan Bani Bu Ali office services Jalan Bani Bu Ali area. In addition, Jalan Bani Bu Hassan Office services Jalan Bani Bu Hassan and Al Kamil & Al Wafi areas. The Governorate has seen a high growth in demand in most areas but especially around Sur area driven by the high growth of simple connections. In addition to that, there are many complex connection applications in this Governorate are expected to be connected during the period covered by this capability statement Existing Capacity at Grid Substations The area is currently supplied from the following 132/33kV grid substations: - Jalan Bani Bu Ali (2 x 125 MVA) Sur (2 x 125 MVA) Al Egga (2x125 MVA) The load (MVA) at the existing grid stations Jalan Bani Bu Ali, Sur and Al Egga as well as for the new Jalan Bani Bu Hassan grid are shown in the table below. Some load will be transferred from Jalan Bani Bu Ali Grid to Jalan Bani Bu Hassan grid. The load of the 132/33kV Grid substations is shown briefly in the next table. Mazoon Electricity Company SAOC Page 47

56 Name Jalan B B Ali Table 34: Load at Grid Substations of South Al Sharqyiah Governorate Capacity Firm Load (MVA) Remarks MVA Capacity (MVA) x New Jalan Bani Bu Hassan Grid in 2018 Sur 2x Al Egga 2x Jalan Bani Bu Hassan 2x Relieve Load from Jalan Bani Bu Ali Grid Reinforcement of Sur Area The area of Sur District has witnessed high load growth in some substations especially in the substation supplying the center of district like Sur Town 2x20 MVA and Sharyah 2x6 MVA which have been growing in demand by 19% annually. There are some projects proposed for this district during the coming three year to meet the load growth and to ensure the compliance of the network to DSSS requirements. 2017: The following projects are proposed for this year: Construction a new 33kV branch from existing Stadium feeder to connect Flaj substation, the length of this branch is about 12 km 200 mm 2 overhead line and 1 km 3Cx300 mm 2 underground cable. New 33 kv feeder from Sur Grid to Al Jinah 2x10 MVA Substation. The feeder has a length of approximately 6 km 200 mm 2 overhead line and 5 km 3Cx300 mm underground cable. Mazoon Electricity Company SAOC Page 48

57 Table 35: Projects Associated with Reinforcement of Sur Area in 2017 No. Project Description Start Reference PIAD 1 2 Construction a new 33kV branch from existing Stadium feeder to connect Flaj substation. Q New 33 kv feeder from Sur Grid to Al Jinah 2x10 MVA Substation Q Related to complex connection Related to complex connection 2018: The following projects are proposed for this year: Upgrading Stadium substation from 2x6 MVA to 2x20 MVA with new 33kV branch with existing TV Heights feeder and the length of this branch is approximately 3 km 3Cx300 mm 2 underground cable. Table 36: Projects Associated with Reinforcement of Sur Area in 2018 No. 1 Project Description Upgrading Stadium substation from 2x6 MVA to 2x20 MVA with new 33kV branch Start Reference PIAD Q SH 01/ : The following projects are proposed for this year: Construction of a new Al Egga Grid 2 x 20 MVA primary substation with two dedicated feeders from Al-Egga Grid of a length of 3 km 3Cx300 mm 2 underground cable. This substation to reduce the percentage load from TV Heights substation and Skikrah substation to compliance with DSSS levels as well as to allow it to accommodate the growth experienced by the area. Construction of a new Al Egga 3 x 20 MVA primary substation with three dedicated feeders from Sur Grid. This substation to reduce the percentage load from Sharyah substation, al Eggah substation and Sur Town substation to compliance with DSSS levels as well as to allow it to accommodate the growth experienced by the area. Mazoon Electricity Company SAOC Page 49

58 Table 37: Projects Associated with Reinforcement of Sur Area in 2019 No. 1 2 Project Description Construction of a new Al Egga Grid 2 x 20 MVA primary substation with two dedicated feeders from Al- Egga Grid Construction of a new Al Egga 3 x 20 MVA primary substation with three dedicated feeders from Sur Grid. Start Reference PIAD Q SH 01/2012 Q SH 01/ Reinforcement of Al Kamil and Jalan Bani Bu Hassan Area The areas of Al Kamil and Jalan Bani Bu Hassan have witnessed high load growth in some substations especially in Al Kamil primary substation 2x20 MVA and Jalan Bani Bu Hassan primary substation which have been growing in demand by 14% and 10% annually. There are some projects proposed for this district during the coming three year to meet the load growth and to ensure the compliance of the network to DSSS requirements. 2017: In this year the following projects are expected to be in service: Construction of Hadry Bilad 33 kv feeder from Jalan Bani Bu Ali Grid to Hadry Bilad 2x6 MVA substation. The feeder has a length of approximately 17.5 km 200 mm 2 overhead line and 1 km 3Cx300 mm 2 underground cable. Upgrading Al Kamil primary substation from 2x20 MVA to 3x20 MVA with constructing 33 kv branch between Al Kamil primary substation and Al Kamil Water Pump 2x6 MVA substation and the length of this branch is about 8 km 200 mm 2 overhead line and 0.75 km 3Cx300 mm 2 underground cable. The upgrading of Al Kamil primary substation is to provide enough capacity for the highly growing area of Al Kamil and Hadry Blaid and to ensure the compliance with DSSS. The construction of the proposed Jalan Bani Bu Hassan 132/33 kv grid station 2x125 MVA in Jalan Bani Bu Hassan area will relieve load of Jalan Bani Bu Ali and provide a closer source for remote substations in BB Hassan and Al-Kamil. The associated 33kV switchgear is proposed under project. The new 33 kv feeders will ensure a better and more reliable 33 kv supply to existing and proposed substations and will improve compliance with Distribution System Security Standards. Mazoon Electricity Company SAOC Page 50

59 Table 38: Projects Associated with Reinforcement of the Al Kamil and Jalan Bani Bu Hassan Area in 2017 No. Project Description Start Reference PIAD Construction of Hadry Bilad 33 kv feeder from Jalan Bani Bu Ali Grid to Hadry Bilad 2x6 MVA substation Upgrading Al Kamil primary substation from 2x20 MVA to 3x20 MVA with constructing 33 kv branch between Al Kamil primary substation and Al Kamil Water Pump Construction of 33 kv switchgear at Al Kamil proposed grid with related 33 kv outgoing feeders. Q Q /2014 Q SH-02/2012 Q SH 01/ : In this year the following projects are expected to be in service: The construction of new Jalan Bani Bu Hassan-2 3x20 MVA primary substation will be constructed to provide enough capacity for the highly growing area of BB Hassan and to ensure the compliance with DSSS. Table 39: Projects Associated with Reinforcement of the Al Kamil and Jalan Bani Bu Hassan Area in 2018 No. Project Description Start Reference PIAD 1 Construction of a new 3 x 20 MVA primary substation Jalan Bani Bu Hassan-2 Q SH 01/ : In this year the following projects are expected to be in service: The construction of Ain Al Washilh MVA primary 2x20 MVA substation will be constructed to provide enough capacity for the highly growing area of BB Hassan and to ensure the compliance with DSSS with 33 kv feeders from Jalan Bani Bu Hassan Grid. Table 40: Projects Associated with Reinforcement of the Al Kamil and Jalan Bani Bu Hassan Area in 2019 No. Project Description Start 1 Ain Al Washilh MVA primary 2x20 MVA Q Reference PIAD Under approval stage Mazoon Electricity Company SAOC Page 51

60 Reinforcement of Jalan Bani Bu Ali Area Jalan Bani Bu Ali area is considered as a highly growing area in electrical demand with average of 9% load growth. 2017: In this year the following projects are expected to be in service: Upgrading Jalan Bani Bu Ali primary substation from 2x20 MVA to 3x20 MVA with constructing a new 33 kv feeder from Jalan Bani Bu Ali Grid to Jalan Bani Bu Ali primary substation. The length of this 33 kv feeder is about 4.2 km 200 mm 2 overhead line and 0.5 km 3Cx300 mm 2 underground cable. The upgrading of Jalan Bani Bu Ali primary substation is to meet the load growth and ensure the compliance with DSSS requirements. No. 1 Table 41: Projects Associated with Reinforcement of the Jalan Bani Bu Ali Area in 2017 Project Description Upgrading Jalan Bani Bu Ali primary substation from 2x20 MVA to 3x20 MVA with constructing a new 33 kv feeder from Jalan Bani Bu Ali Grid to Jalan Bani Bu Ali primary substation Start Reference PIAD Q SH 02/ : In this year the following projects are expected to be in service: Upgrade Al Ashkharah primary substation to 2x20 MVA to cover load demand and comply with DSSS. Table 42: Projects Associated with Reinforcement of the Jalan Bani Bu Ali Area in 2018 No. Project Description Start Reference PIAD 1 Upgrade Al Ashkharah primary substation to 2x20 MVA Q Under approval stage 2019: In this year the following projects are expected to be in service: Mazoon Electricity Company SAOC Page 52

61 Constructing Jalan Bani Bu Ali Grid primary substation 2x20 MVA with constructing two new 33 kv dedicated feeder. The New Jalan Bani Bu Ali Grid primary substation is to provide enough capacity for the highly growing area of Jalan Bani Ali. Table 43: Projects Associated with Reinforcement of the Jalan Bani Bu Ali Area in 2019 No. 1 Project Description Constructing Jalan Bani Bu Ali Grid primary substation 2x20 MVA with constructing two new 33 kv dedicated feeder. Start Reference PIAD Q SH 02/ Strategic Development Statement for South Al Batinah Governorate South Al Batinah is the largest populated region in Oman and consist of seven Willayat namely Rustaq, Awabi (both serviced by Rustaq office) Nakhal and Wadi Al Maawel (both serviced by Nakhal office), Barka, Musanah and Suwaiq which are serviced by a dedicated office. It has both coastal & mountainous areas. South Al Batinah governorate within the Mazoon Electricity Company area is currently undergoing significant development due to major investment around the Blue City area, the Asian Beach Games city and Al Batinah Costal Road. The governorate has seen a growth in demand especially around the Barka area due to a movement of population from Muscat and a lot of growth in Commercial buildings & centers. General load growth in this area is high with a regional average of 15% Grid stations Next table shows Grid stations load at South Al Batinah Governorate grids: Name Barka Main Madinat Barka-A Madinat Barka-B Table 44: Grid stations load at South Al Batinah governorate Capacity Firm Load (MVA) (MVA) Capacity (MVA) Remarks 3x Some load shifted to Madinat Barka-A in 2016 and to Hai Asem Grid & Madinat Barka-B Grid in x Relieve some load from Barka Main Grid 2x Relieve some load from Madinat Barka-A Grid in Mazoon Electricity Company SAOC Page 53

62 2017 and from Barka Main in 2018 Hai Asem 2x Relieve some load from Barka Main Grid in 2018 Muladah 2x Some load shifted to Muladah-B in 2017 Maludah- B 2x Relieve some load from Muladah Grid Al Swadi 2x Relieve some load from Barka Main Grid Rustaq 3x Some load shifted to Awabi Grid in 2018 Wadi Bani Awf 2x Relieve some load from Rustaq Grid Nakhal 2x MIS 2x Some load shifted to Khadhra A&B in 2017 and Suwaiq in 2018 Khadhra 2x Relieve some load from MIS and Khabourah Grid Khadhra B 2x Relieve some load from Khadhra Grid Suwaiq 2x Relieve some load from MIS Grid Khaburh (Majan) 2x All load shifted to Khadhra A Grid MZEC recognized the non-ordinary growth in the coastal areas of South Al Batinah driven by considerable number of governmental investments in form of tourism projects, infrastructure projects, and industrial projects as well as private sector investments accompanying them. All of that indicates clearly that this part of the Governorate is going to play a significant role in the development of the country. New grid stations will be in service in 2018 and 2019 to meet the demand in whole Mazoon Electricity Company SAOC Page 54

63 South Al Batinah Governorate. Madinat Barka A (TX-1&TX-2) and Al Khadhra A (TX-1&TX-2) are currently in service. Therefore, MZEC had submitted applications for eight additional grid stations in South Al Batinah. Three grid stations will be in Barka which are Madinat Barka A (TX-1 & TX-2) 2x125 MVA, Madinat Barka B (TX-2 & TX-3) 2x125 MVA and Hai Asem 2x125 MVA. Three grid stations will be in Suwaiq that are Al Khadhra A (TX-1 & TX-2) 2x125 MVA, Al Khadhra B (TX-2 & TX-3) 2x125 MVA and Suwaiq 2x125 MVA. However, Madinat Barka A (TX-1 & TX-2) 2x125 MVA and Al Khadhra A (TX- 1 & TX-2) 2x125 MVA were in service in summer In addition, One grid station will be in Musanah that is Muladah-B (TX-2 & TX-3) 2x 125 MVA and another one will be in Rustaq which is Wadi Bani Awf 2x 125 MVA Reinforcement of the Suwaiq area Suwaiq area currently is supplied from Muladah Interconnection Substation (MIS) 2x 125 MVA and Khabourah 2x 125 MVA (Majan) grid stations. In 2017, all Suwaiq load from Khabourah grid station will be shifted to Khadhra A (TX-1& TX-2) 2x 125 MVA grid station. New project will be associated to shift this load and to meet load growth in Suwaiq area as described below: 2017: Currently Bidaya area is fed from Khabourah Grid station which is in the authorized area of Majan Electricity Company (MJEC) through three feeders. These are Bidaya-1, Bidaya-2 and Bidaya-3. For permanent solutions within Bidaya and Suwaiq areas, MZEC has submitted an application for a new Grid station at Khadhra area (Khadhra Grid 2x125 MVA 132/33 kv Substation) targeted before summer To utilize the new Grid station efficiently, MZEC has planned a batch of new 33 kv feeders to be constructed and put into service before or by the commissioning of Khadhra Grid station for the immediate load redistribution and release of the feeders from Khabourah Grid station. The table below shows the new feeders together with their allocations to the primary substations in year The following projects are proposed: Khadhra Grid 2x125 MVA is currently on service and there are some projects associated with this grid and will be in service in 2017 and that are as described below: Construction two new feeder to Marble Factory 3x6 MVA substation. One of them dedicated to substation length 20 km OH and another one link with feeder exist Marble factory from MIS grid length 6 km OHL. Construction of a new feeder to Khadhra 2x20 MVA substation length of 5.8 km OHL and 5.5 km UGC. That will improve voltage and ensure the compliance to security standards. Construction of two new feeders to Khadhra Bu Reshaid 2x20 MVA substation length 3.35 km OHL and 1.5 km UGC per feeder to provide second source for these substations and complying with DSSS. Mazoon Electricity Company SAOC Page 55

64 Install one new 33 kv feeders from Khadhra Grid to link with the the existing Bidaya feeder length 7.7 km OHL and 2.7 km UGC. And new 33 kv feeder to Bidaya Tx-3 length 7.7 km OHL and 2.7 km UGC. Moreover, that will improve voltage and ensure the compliance to security standards. Construction two new feeders to new a primary Badi AL Amoud 2x20 MVA length 9 km OHL and 6 km UGC. To be ensure compliance of security standards of Bidaya substation, constructing a new Badi Al Amoud 2x20 MVA with two 33 kv feeders length 7 km OHL and 0.5 km UGC from Khadhra grid to relieve around 12 MVA. Upgrading Bidaya to 3x20 MVA to meet high growth in the area, relief some load from Bidaya suq 2x6 MVA and shift all load from Shabyah substation 2x6 MVA. This will remove the overload and will bring the site closer to N-1 compliance. Upgrade Wadi AL Jahawer to 2x6 MVA and Wadi Al Haimly to enhance the compliance to the security standards. Construction of a new primary Al Batha substation with a capacity of 3x20 MVA will relieve loads from Suwaiq, AL Hadheeb and Suwaiq I Area Substations. This will remove the overload and will bring the site closer to N-1 compliance. And it is proposed to link with feeders exist (Khadrh-1, Khadhrah-2 & Marbal Factory) from MIS grid. Establish a new location for Dhyan primary, south west of the existing site, to establish a 2 x 20 MVA primary substation with space for a future, 3rd 20 MVA transformer. This will remove the overload and will bring the site closer to N-1 compliance. And the new substation will feed from Dhyan-1 & Dhyan-2 from Khdrah grid. Construction of a new primary Al Uraiq substation with a capacity of 3x20 MVA will relieve loads from Khadhra and Khadhra Bu Rshaid and Al Uqdah Temp. Construction a new primary Al Khabah 3x20 MVA and three new feeders. Table 45: Projects Associated with Reinforcement of Suwaiq Area in 2017 No. Project Description Start 1 Construction of Khadhra Grid 33 kv busbar and 33 kv switchgear Q Ref. PIAD 2017 SB- 35/ Upgrading Bidaya to 3x20 MVA Q Construction of a new primary AL Batha substation with a capacity of 3x20 MVA with three Q SB- 01/ SB- 04/2013 Mazoon Electricity Company SAOC Page 56

65 feeders link with existing (Khadhra-1, Khadhra-2 & Marbal Factory) feeders MIS grid. 4 Construction of a new primary AL Khabah substation with a capacity of 3x20 MVA with three feeders from MIS grid. 5 Upgrade Wadi AL Jahawer to 2x6 MVA and Al Haimly to 2X6 MVA 6 Construction of a new primary Badi Al Amod substation with a capacity of 3x20 MVA with new two feeders. 7 Construction of a new primary Dhyan substation with a capacity of 2x20 MVA with new two feeders. 8 Construction of a new primary Al Uraiq substation with a capacity of 3x20 MVA. With three 33 kv feeders from Khadhrah grid. Q Q Q Q Q Coastal Area PIAD 2017 SB- 22/ SB- 01/ SB- 01/ SB- 02/ : To cover the high growth in Suwaiq area, MZEC has submitted an application to OETC for a new grid supply point in Suwaiq area. This new grid will relieve load of MIS grid. The associated 33kV switchgear is proposed under project. The new 33 kv feeders will ensure a better and more reliable 33 kv supply to existing and proposed substations and will improve compliance with Distribution System Security Standards. Almost all of the new planned feeders are of short lengths and it is required to link the existing O/H lines to the Grid station. The following projects are proposed: Construction of Suwaiq Grid 33 kv busbar and 33 kv switchgear and the feeders will improve voltage and ensure the compliance to security standards. Construct two feeders length 2 km UGC to link with Suwaiq-1&2 from MIS grid. This two feeders will feed Suwaiq Tx-1& 2 substation. Construct three feeders to feed Al Subikhi 3x20 MVA by link with feeders exist (Khadrh- 1, Khadhrah-2&Marble factory) from MIS grid length 3 km UGC. Construct three feeders to feed Al Khabh 3x20 MVA by link with feeders exist (Khabh- 1, Khabh-2 & Khabh-2) from MIS grid length 3 km UGC. Construct one dedicated feeder to Suwaiq I Area Tx-1 length 1.6 km UGC. Mazoon Electricity Company SAOC Page 57

66 Construct three feeders to feed Al Batha 3x20 MVA length 3 km UGC. Table 46: Projects Associated with Reinforcement of Suwaiq Area in 2018 No Project Description Start Ref. PIAD 1 Construction of Suwaiq Grid 33 kv busbar and 33 kv switchgear with 33kV feeders Q SB- 04/ Reinforcement of the Musanah area To meet the load growth requirements in this region a number of upgrades, expansions or additional Primary Substations are required. This is to ensure capacity is available in time for connection of new customers and also to ensure the Musanah area remains in a DSSS compliant state. The new projects will be description as following: 2017: The following projects are proposed in this year: A new 3x20 MVA primary substation will be constructed to supply the coastal load compensation areas in Musanah District namely Musanah Al Sahil with three 33 kv feeders. Musnah Al Sahil S/S will be fed from Al Sawadi Grid. Moreover Musanah Al Sahil S/S will relieve load from Musanah S/S. Upgrading Muladah to 3x20 MVA to match the Security Standards. Upgrading Maharh to 3x20 MVA to match the Security Standards. Upgrading Musanah Industrail Area to 2x20 MVA to match the Security Standards Table 47: Projects Associated with Reinforcement of Musanah Area in 2017 No. Project Description Start 1 Construction of new primary Musanah Al Sahil substation with a capacity of 3x20 MVA with three feeders. Q Upgrading Maharh to 3x20 MVA. Q Upgrading Muladah to 3x20 MVA. Q Ref. PIAD 2017 Coastal Area PIAD 2017 SB- 05/ SB- 05/2013 To cover the high growth in Musnah area, OETC started to construct a new grid supply point in Musanah area. This new grid will relieve load of Muladah grid. The associated 33kV switchgear is Mazoon Electricity Company SAOC Page 58

67 proposed under survey. The new 33 kv feeders will ensure a better and more reliable 33 kv supply to existing and proposed substations and will improve compliance with Distribution System Security Standards. Almost all of the new planned feeders are of short lengths and it is required to link the existing O/H lines to the Grid station. The following projects are associated with Muladah-B (TX-3& TX-4) 2x125 MVA grid station: Construction of Muladah B Grid 33 kv busbar and 33 kv switchgear and the feeders will improve voltage and ensure the compliance to security standards. Construct three feeders length 3 km UGC to feed Al Qurihat 3x20 MVA substation. Construct a new feeder to feed Muladah Tx-3. Construct a new feeder to feed Maharh Tx-3. Table 48: Projects Associated with Muladah-B grid station at Musanah Area in 2017 No. Project Description Start 1 Construction of Muladah-B Grid 33 kv busbar and 33 kv switchgear with 33kV feeders Ref. PIAD Q SB- 05/ : The following projects are proposed in this year: Constructing Maghser South 2x6 MVA to accommodate the load currently situated and to bring the site closer to N-1 compliance. To feed the substation, it is propose to feed from (Billah-1) length 1 km UGC and another source is a link from existing feeder (Billah-2) length 1 km UGC. Table 49: Projects Associated with Reinforcement of Musanah Area in 2017 No. Project Description Start 1 Constructing Maghser South 2x6 MVA and new 33 kv feeder length 12.5 km UGC Ref. PIAD Q SB- 05/ Reinforcement of the Nakhal Area 2017: In this year the following projects are expected to be in service: Mazoon Electricity Company SAOC Page 59

68 Construct a new 1x6 MVA substation to supply South Al Batinah Logistics project and feed it by constructing a new 33kV dedicated feeder from Nakhal grid and by a 33kV tap from Al Abiyadh feeder as backup supply. Construct a new 33kV Afi-2 feeder and link it with existing Al Taw feeder to supply Afi 2x20 MVA substation. Table 50: Projects Associated with Reinforcement of the Nakhal Area No. Project Description Start 1 Construction of New 1x6 MVA substation to supply South Al Batinah Logistics 2 Construct a new 33kV Afi-2 feeder and link it with existing Al Taw feeder to supply Afi 2x20 MVA substation Q Q year 2016 Ref. PIAD 2017 SB- 27/ Reinforcement of the Barka Area Barka is one of the biggest developed area in Oman. Large projects are coming soon in Barka including many big residential buildings and commercial centers. Also there is a huge development in the industrial side as of Suqsuq and Felaij Industrial Areas. In fact, it is a normal extension to the capital of the Muscat governorate. Logistic areas have been constructed in Barka rather than Muscat to be used for exporting inside Oman. The new projects related to Barka area are detailed below: 2017: In this year the following projects are expected to be in service: Construction of Al Namman substation with a capacity of 3x20 MVA and three new 33 kv feeders from Blue City Grid. The substation will relieve load from Barka New substation and Al Hufri substation. Table 51: Projects Associated with Reinforcement of Barka Area in 2017 No. Project Description Start 1 Construction of Al Namman 3x20 MVA Substation with 3 new 33 kv feeders from Blue City Grid. Q Ref. PIAD 2016 SB- 01/2012 Madinat Barka-A (TX-1&TX-2) 2x125 MVA grid station had been in service in summer 2016 and some load had been relived from Barka Main grid. Four 33kV feeders are still under construction and that will be in service by 2017 as described below: Mazoon Electricity Company SAOC Page 60

69 Four 33kV feeders will be constructed in Madinat Barka-A (TX-1&TX-2) grid station to relieve load from Barka Main grid and these feeders are Saqsuq-1, Saqsuq-2, Saqsuq-3 and Barka Town : In this year the following projects are expected to be in service: Upgrading of Barka Town substation from 2x20 MVA to 3x20 MVA with a 33kV new feeder of 4km length to supply Barka Town area which has high load and to be complying with DSSS requirements. Table 52: Projects Associated with Reinforcement of the Barka Area in 2017 No. Project Description Start 1 Upgrading of Barka Town substation from (2x 20 MVA) to (3 x 20 MVA) with a 33kV feeder (4km cable 3c 300mm2 (Easy terrain)) Q Ref. PIAD 2017 SB- 07/2013 Two grid stations will be in service in this year as detailed below: A) Projects associated with Madinat Barka-B Grid Station The following projects are associated with Madinat Barka-B grid station: Three feeders will be constructed to relive load from Madinat Barka-A grid station and these are Saqsuq-1, Saqsuq-2 and Saqsuq-3. Table 53: Projects Associated with Reinforcement of the Madinat Barka-B grid station in 2018 No. Project Description Start 1 Construct of Saqsuq-1, Saqsuq-2 and Saqsuq-3 to relive load from Madinat Barka-B Q Ref. PIAD 2018 SB- 07/2013 B) Projects associated with Hai Asem Grid This grid is mainly planned to be constructed to supply a complex customer load for Barka IWP which has electrical connection request of 60 MW. Three substations will be constructed within this grid and the details will be described on sponsor section. Mazoon Electricity Company SAOC Page 61

70 2019: In this year the following projects are expected to be in service: Constructing of Al Huradi substation with a capacity of 3x20 MVA and three new 33 kv feeders from Madinat Barka-B grid station and each one has a length of about 10km 3Cx300mm2 underground cable. Al Huradi substation will relieve load from Somahan and Barka New substations. The three substations will be complied with DSSS. Constructing of Somahan South substation with a capacity of 2x20 MVA and two new 33 kv feeders from Madinat Barka-B grid station and each one has a length of about 2km 3Cx300mm2 underground cable. Somahan South substation will relieve load from Barka Town substation. Somahan South Temp 1x6 MVA substation will be dismantle after Somhan South 2x20 MVA substation. Somahan South and Barka Town substations will be complied with DSSS. Construction of Hai Asim substation with a capacity of 3x20 MVA and three new 33 kv feeders from Hai Asem Grid each one has a length of about 3 km 3Cx300mm2 underground cable. Hai Asem substation will relieve load from Rumais and Salaha substations. The three substations will be complied with DSSS. Construction of Al Haram substation with a capacity of 3x20 MVA and three new 33 kv feeders from Hai Asem Grid each one has a length of about 5km 3Cx300mm 2 underground cable. Al Haram substation will relieve load from Salaha substation and Al Haram Temp substation will be dismantled. Al Haram and Salaha substations will be complied with DSSS. Upgrading of Al Uqair substation from 1x6 MVA to 2x20 MVA to supply Al Uqair and some of Barka town area which have high load growth and to be complying with DSSS requirements with a new 33kV feeder tapping from Barka-5 feeder. Table 54: Projects Associated with Reinforcement of the Barka Area in 2019 No. Project Description Start Ref. PIAD 1 Constructing of Al Huradi substation with a capacity of 3x20 MVA and three new 33 kv feeders from Madinat Barka Grid-B Q SB- 07/ Constructing of Somahan South substation with a capacity of 2x20 MVA and two new 33 kv feeders from Madinat Barka Grid-B 3 Constructing Hai Asem 3x20MVA substation with three 33kV feeders (3km cable 3c 300mm2 (Easy terrain)). 4 Constructing Al Haram 3x20MVA substation with three 33kV feeders (5km cable 3c 300mm2 (Easy terrain)). Q Q Q SB- 07/ SB- 07/ SB- 07/2013 Mazoon Electricity Company SAOC Page 62

71 5 Upgrading of Al Uqair substation to 2x20 MVA with a new 33kV feeder tapping from Barka-5 feeder. Q SB- 07/ Reinforcement of the Rustaq Area Rustaq is one of the development areas in Oman. There are some of the big governmental projects in this area. Rustaq distribution network is already loaded and most of the substation is out of DSSS requirements. The new projects in Rustaq area are detailed below: 2017: In this year the following projects are expected to be in service: Construction of Tawi Al Badw substation 1x6 MVA inside to relive load from Al Hooqain substation and to improve the voltage drop due to the lengthy 11 kv feeders inside Al Hooqain area. Upgrading of Wadi Bani Awf substation from 1x6 MVA to 2x20 MVA and constructing one new 132 kv double circuit towers from Rustaq Grid operated as 33kV in the first phase until New Awabi Grid will come in This substation will cover the load growth in this area and it will be complied with DSSS requirements. Construct a new Wadi Al Sahtan 1x6 MVA substation in 4 km away from Wadi Al Sahtan 2x6 substation forward the wadi to relive the substation and to improve the voltage in this area. Table 55 : Projects Associated with Reinforcement of Rustaq Area in 2017 No. Project Description Start 1 Construction of Tawi Al Badow substation 1x6 MVA inside Wadi Al Hooqain Q Ref. PIAD 2017 SB- 09/ Upgrading of Wadi Bani Awf substation from 1x6 MVA to 2x20 MVA 3 Construct a new Wadi Al Sahtan 1x6 MVA substation in 4 km away from Wadi Al Sahtan 2x6 substation Q Q SB- 08/ SB- 09/ : In this year the following projects are expected to be in service: Upgrading of Wadi Bani Ghafer substation from 2x6 MVA to 2x20 MVA and constructing two new 33 kv feeders from Rustaq Grid each one a length of about 15 km OHL Panther and 4 km 3Cx300mm2 underground cable. This substation will cover the load growth in this area and it will be complied with DSSS requirements. Mazoon Electricity Company SAOC Page 63

72 Upgrading of Al Hazim substation from 2x6 MVA to 2x20 MVA to supply the new complex connections which is about 7 MW and cover the load requirement in Al Hazim area. Upgrading of Awabi substation from 3x6 MVA to 2x20 MVA to supply Awabi area which is highly growth area and to be complied with DSSS requirements. Table 56: Projects Associated with Reinforcement of Rustaq Area in 2018 No. Project Description Start Ref. PIAD 1 Upgrading of Wadi Bani Ghafer from 2x6 MVA to 2x20 MVA with 2 new 33 kv feeders 2 Upgrading of Al Hazim substation from (2x 6 MVA) to (2 x 20 MVA) Indoor substation. 3 Upgrading of Awabi substation from 3x6 MVA to 2x20 MVA Q Q Q SB- 09/ SB- 09/ SB- 09/ : In this year the following projects are expected to be in service: Construction of new 2x6 MVA substation in Al Marji area to relive Al Kahaf substation and to be complied with DSSS requirements. Constructing of New Woshil 2x20 MVA substation with two new 33 kv feeders from Rustaq Grid each one a length of about 15km 3Cx300mm2 underground cable. The substation will relive load of existing Woshil 2x20 MVA substation and complied it with DSSS requirements. Constructing of Kasfah 2x20 MVA substation with two new 33 kv feeders from Awabi Grid each one a length of about 2km 3Cx300mm2 underground cable. The substation will relive load of existing Woshil 2x20 MVA, Rustaq 2x20 MVA and Makhsoufah 2x6MVA substation and complied them with DSSS requirements. Table 57: Projects Associated with Reinforcement of Rustaq Area in 2018 No. Project Description Start Ref. PIAD 1 Construction of new 2x6 MVA substation in Al Marji area 2 Constructing of New Woshil 2x20 MVA substation with two 33kV feeders (15km cable 3c 300mm2 (Easy terrain)). Q Q SB- 09/ SB- 09/2013 Mazoon Electricity Company SAOC Page 64

73 3 Constructing of Kasfah 2x20 MVA substation with two 33kV feeders (2km cable 3c 300mm2 (Easy terrain)). Q SB- 09/2013 In this year, Wadi Bani Awf 2x125 MVA grid station will be in service and six 33kV feeders will be constructed with associated with this project as described below: Six 33kV feeders will be constructed in Wadi Bani Awf 2x125 MVA grid station to relieve load from Rustaq grid and these feeders are Makhsoufah-1, Makhsoufah-2, Awabi-1, Awabi-2, Wadi Bani Awf-1 and Wadi Bani Awf Sponsor Projects Sponsor projects is called complex connection in connection statements. It is defined in the approved connection statement as those connections with a distance of more than 1.5 kilometer and with a connected load of 2.5 MW or more, the sponsor will pay for all investments. Having said that, it is worth mentioning that a lot of uncertainty accompanies complex customers applications in terms of load and time for connections. Many applications were received since last year capability statement and the seriousness of some is questioned. In this section will listed the serious applications that the customer response to MZEC's offer: 2017: Construction of Ibra ROP 2x6 MVA substation to fed New ROP project with two links from MOD and Ibra Hospital 33 kv feeders. Construction of new 2x6 MVA substation phase I Al Al Sharqiyah University with 33 kv feeder from Ibra Grid. Construction of Suwaiq ROP 2x6 MVA substation to fed New ROP project with new 33 kv feeder from Khadra Grid and link from Marble Factory 33 kv feeders. Construction of Sur ROP 3x6 MVA substation to fed New ROP project with new 33 kv branch from Fleej Water Pump 33 kv feeder. South Al Batinah Logistics 1x6 MVA substation to feed the Logistics area at Nakhal area. Upgrade ROP Academic substation from 1x6 to 3x6 MVA to cover the new load of the under construction building inside the academic. Construction New 2x6 MVA in Bircat AL Mouz to feed Royal Oman Police project with one new dedicated 33 kv feeder from Izki Grid and one new tapping from Birkat AL Mouz-2 33 kv feeder. Construction of Adam Airport substation 2x20 MVA with two 33 kv feeder 15 km overhead line from Adam Grid. Mazoon Electricity Company SAOC Page 65

74 Construction New 2x6 MVA in Siaw to feed Al Zain project with tapping from Aflaje 33 kv feeder. Table 58: Sponsor Project in 2017 No. Project Description Start Governorate 1 Construction of Ibra ROP 2x6 MVA substation to fed New ROP project with two links from MOD and Ibra Hospital 33 kv feeders 2 Construction of new 2x6 MVA substation phase I Al Al Sharqiyah University. 3 Construction of Suwaiq ROP 2x6 MVA substation to fed New ROP project with new 33 kv feeder from Khadra Grid and link from Marble Factory 33 kv feeders. 4 South Al Batinah Logistics 1x6 MVA substation to feed the Logistics area at Nakhal area. 5 Construction of Sur ROP 3x6 MVA substation to fed New ROP project with new 33 kv branch from Fleej Water Pump 33 kv feeder. 6 Construction New 2x6 MVA in Bircat AL Mouz to feed Royal Oman Police project 7 Upgrade ROP Academic substation from 1x6 to 3x6 MVA to cover the new load of the under construction building inside the academic. 8 Construction of Adam Airport substation 2x20 MVA with two 33 kv feeder 9 Construction New 2x6 MVA in Siaw to feed Al Zain project Q Q Q Q Q Q Q Q Q North AL Sharqiyah 2017 North AL Sharqiyah 2017 South Al Batinah 2017 South Al Batinah 2017 South AL Sharqiyah 2017 Al Dakhliyah 2016 Al Dakhliyah Q Q Al Dakhliyah North AL Sharqiyah 2018: Upgrade ROP Academic substation from 1x6 to 3x6 MVA to cover the new load of the under construction building inside the academic. Constructing two 2x20MVA substations for Barka IWP with two 33kV feeders for each substation and each has a length of 2km 3Cx300mm2 underground cable. Mazoon Electricity Company SAOC Page 66

75 Construct Sandan 2x20 MVA substation with two dedicated 33kV feeders from Madinat Barka-A grid station. Table 59: Sponsor Project in 2018 No. Project Description Start Governorate 1 Upgrade ROP Academic substation from 1x6 to 3x6 MVA to cover the new load of the under construction building inside the academic. 2 Constructing two 2x20MVA substations for Barka IWP with two 33kV feeders for each substation and each has a length of 2km 3 Construct Sandan 2x20 MVA substation with two dedicated 33kV feeders from Madinat Barka-A grid station 4 Construct a new 3x6 MVA substation to supply the sponsor project of ROP Wadi Al Mawel complex. Q Q Q Q Al Dakhliyah 2018 South Al Batinah 2018 South Al Batinah 2018 South Al Batinah 2019: Construction of SIWP 2x20 MVA substation with two new 33 kv feeder from Sur Grid. Table 60 : Sponsor Project in 2019 No. Project Description Start Governorate 1 Construction of SIWP 2x20 MVA substation with two new 33 kv feeder from Sur Grid. Q South AL Sharqiyah 14. Assessment of MZEC Distribution System losses The Authority for Electricity Regulation, Oman starting from 2009 has imposed an incentive / penalty mechanism for distribution system operators. s were set for each Price control based on a targeted annual incremental reduction such that if any of the companies managed to reduce its losses more than the annual target, it will be incentivized by the mechanism embedded in the Price Control Formula. On the other hand if any of the companies failed to achieve the targeted losses reduction it will be subject to a penalty. For Mazoon Electricity Company, the annual incremental reduction target was 1.9% in the period of ( ) and 0.9% for the period of ( ) with starting point of 12.8%.Table 61 below presents the annual losses reduction targets determined by the Authority. Mazoon Electricity Company SAOC Page 67

76 Table 61: MZEC losses s 2008* % 19.5% 17.6% 15.7% 12.8% 11.9% 10.28% 10.3% 8.9% As part of MZEC efforts in managing losses reduction continued in its losses Management structure that was introduced in 2009 and constitutes of a central losses management team and three losses management teams one per region. An annual reduction target for each team is set at the beginning of each year based on previous year performance and taking into consideration the agreed target with the Authority. MZEC thankfully was able to exceed the target set for year 2014 of 10.7% by recording at the end of the year 10.28% which consequently led MZEC to be entitled for a considerable incentive. Till the time of issuing this capability Statement, only unaudited figures of bulk supply quantities and regulated units distributed for the period from January to August 2016 is available. Figure 6 below presents MZEC position at the end of August Losses % MZEC Al Dakhilyiah North Al Sharqiyah South Al Sharqiyah South Al Batinah Distribution Loss 2015 % 2016 % Distribution Loss 2016 % Figure 6: MZEC losses regional wise (2015, 2016 vs target 2016) It is obvious that MZEC till August has reached 14.3% which is less than the losses recorded in year 2015 by around 4% hitting a percentage lower that agreed target with expectation of reducing the losses even further by the end of the year. Furthermore, it is obvious that South Al Batinah governorate contributes for well over 50% of MZEC losses and the other three governorates namely Al Dakhilyiah, South Al Sharqiyah and North Al Sharqiyah contribute together for the remaining percentage. Figure 7 below illustrates the regional contribution to MZEC losses for the period January to August Mazoon Electricity Company SAOC Page 68

77 % Share of MZEC Losses Al Dakhilyiah North Al Sharqiyah South Al Sharqiyah South Al Batinah Figure 7: Regional Losses Contribution to the overall MZEC losses It is worth mentioning that although the losses reduction achieved so far is significant and important, still there is a lot to do to bring the system losses to acceptable level and MZEC wishes to maintain the momentum expressed in 2016 and in 2017 in further years driven by its vision to be one of the leading distribution and supply companies in the region by Network Suitability for New Connections Taking a glance at the Equipment Loadings shown Annexure 1-A-1, 1-A-2, 1-B-1, 1-B-2, 1-C-1, 1- C-2,1-D-1 and 1-C-2, it is seen that the 33 kv network and its components will be partially relieved by the reinforcements programs. Despite the fact that for simple new connections which are defined in the approved connection statement as those connections with a distance of less than 1.5 kilometer and with a connected load of 2.5 MW or less, MZEC will not stop any application because of network capability. On the other hand, for complex connections, the situation is totally different. In many locations the network requires investments at grid level either in terms of additional capacity or availability of circuit breakers. Further constraints are also at primary substations and 33 kv feeders driven by the considerable growth experienced especially at the coastal part of South Al Batinah Governorate, Nizwa in Al Dakhilyiah Governorate and parts of Al Sharqyiah (South and North) Governorates. Having said that, it is worth mentioning that a lot of uncertainty accompanies complex customers applications in terms of load and time for connections. Many applications were received since last year capability statement and the seriousness of some is questioned. An example to that, a new industrial area in Sumail requires large loads within a timeframe of few years which might require investment at transmission network. On the other hand, such investment requires commitment from applicants as well as accuracy in their applications. MZEC in this regard proposes to establish a mechanism to filter serious applicants from non-serious applicants. Once this mechanism is approved and implemented, it will contribute significantly to plan for future investments. Mazoon Electricity Company SAOC Page 69