ANNUAL REPORT

Transcription

1 ANNUAL REPORT STATE LOAD DESPATCH CENTRE GUJARAT ENERGY TRANSMISSION CORPORATION LIMITED

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3 From The Chief Engineer s Desk I am pleased to present the Annual Report of SLDC, Gujarat for the financial year It was undoubtedly a period of rapid change and major challenges for the grid operation. Our annual report covers our roles as System Operator. Electricity is the essential component of all economic activity, and for realising State socio economic objectives. SLDC, Gujarat must therefore ensure to operate Gujarat power system in such a way that it provides reliable supply of electricity and maintains the security of the power system too. Our annual report is an integrated one that sets out an in-depth, contextual review of overall performance of the State Grid for the financial year It outlines Grid operation reviews, key challenges of the service and how it has overcome them or plans to do so. Everything we do, and everything we plan to do, stems from our paramount commitment to ensuring the most reliable electric grid possible. SLDC is mainly carrying out two types of operational activities; one is grid operation to ensure safe, reliable and economic despatch of electricity in the State of Gujarat and the other is commercial operation including merit order despatch, Short Term Open Access, accounting of scheduled energy, unscheduled energy exchange and reactive energy exchange. Grid Operation SLDC manages electricity transmission in the State and guarantees its safety, quality and reliability round the clock. It ensures equal access conditions for all grid users with the experience and technical expertise acquired in managing complex systems. The generation capacity addition of 19.19% (3473 MW) is achieved compared to 18.65% addition during previous year The addition comprises of 696 MW from Renewable sources, 600 MW from Private Sector and 2177 MW from Central Sector. 38 Nos. of EHV transmission elements were added in Gujarat system during the year A rise of 11.53% in total energy catered and a rise of % in Maximum demand catered are worth mentioning. The energy received from renewable sources is 6624 MUs (7.55% of total energy) while it was 4175 MUs (5.30 % of total energy) in the previous year and the rise of 58% in contribution from renewable sources is quite remarkable. These figures indicate that complexity of grid is increasing enormously. There are lot of uncertainties prevailing in the grid such as demand variation, wide variation in generation from renewable sources etc. During the year, SLDC has made numerous efforts to ensure safe, secure, economic and reliable grid operation. By the end of July-2012, two major regional level grid disturbances occurred. In both the grid disturbances, Western Regional grid had survived mainly due to SPS operation at APL, Mundra. Generation of APL, CGPL & EPGL power plants were affected so many times due to frequent tripping of EHV lines in Kutch & Saurashtra pocket due to bad weather conditions during July-Aug-12. SLDC s efforts in handling these situations were indeed noteworthy for quick restoration of the system. SLDC is managing such complexities by using advanced Power System Tools, effective planning for outages of transmission elements and generating units, ensuring real time data for entire grid observation etc. Variation of MW generation in a day from renewable sources is quite common. Such variation in the 1

4 system is persistent and is handled by continuously analysing weather related information, generation regulation, optimizing the operation of lines, ICTs and shunt elements like capacitors and reactors. Commercial Operation By mandate, SLDC is the nodal agency for STOA in the State. SLDC has to carry out energy accounting for computation of capacity charges, scheduling charges and transmission losses. Also, SLDC has to maintain and manage UI Account, Reactive Energy Account and Congestion Charges Account and Regional Transmission Deviation (RTDA) Account. It is our pride that Gujarat State has implemented Intra-State ABT Mechanism complete in all respects since April 2010 for better grid discipline and accounting. With the capacity addition taking place at a faster pace, the substantial increase in interconnections between different subsystems and the inevitable need to provide efficient and effective STOA platform, the data processing and publishing work at SLDC has tremendously increased. SLDC is handling 1347 Nos. of SEM data weekly as on Mar-13 compared to 1123 Nos. in March-12. At present, SLDC has 73 pool members in UI accounts compared to 67 during previous year and the number is on the rise. The Nos. of STOA applications processed during the year was 4816 while it was 1187 in the previous year. During the year , an amount of Rs crore was handled in UI pool accounts whereas in the year , it was Rs crore. The huge difference in UI pool account is due to the operational discipline enforced after the regional level grid disturbance on 30 th & 31 st July-12. Initiatives for Improvement A lot of initiatives were taken to improve operational performance. In April-2012, black start mock drill for SSP machine was carried out with the objective of achieving restoration of total system in the shortest possible time. SLDC had made fabulous efforts to facilitate outages for construction of new EHV lines and for R & M work of EHV lines so as to accommodate new elements in the grid at the right time and to ensure reliable operation of transmission network. SLDC has made initiatives to hold State level Operation Coordination Committee meetings at regular intervals wherein all the representatives of State & Central generating stations and Discoms are invited to have discussions on all grid operation related matters. These meetings are very much helpful for carrying out operation analysis, improving grid performance and resolving various issues pertaining to all the stake holders. SLDC has taken keen interest to relieve congestion in the network by proposing worthwhile changes in network topology and getting them implemented through the concerned agencies so as to have a secure and reliable grid operation. Our SCADA & IT team had done remarkable work for data visualization, maintaining RTU availability and communication link with control centre. Also, 86 Nos of RTU s are provided for accessing data of renewable energy generation in real time which is very much helpful to recognize trend of RE generation and handle its variation. Lot of efforts are made for accessing of various data by Users from SLDC website which maintains a high degree of translucent environment. SLDC received PSS/E software for power system analysis. The existing network upto 132 KV level is modelled and it is intended to utilize this software for outage security assessment studies. SLDC believes in knowledge sharing and skill enhancement of each of its working associates. Almost 2

5 in all capacity building workshops and training programs, SLDC officials are delegated. Also, inhouse discussion sessions are regularly arranged so that each individual s skill and area of interest is candidly recognized. As a result of this, SLDC Gujarat is proud to have the highest number of certified system operators i.e. 39 (Basic level certification of power system operation) & 26 Nos. of officers having specialist level certification on regulatory frame work in power sector which is also the highest in the country. Focus Areas for A number of opportunities and challenges exist for Gujarat Grid. Key amongst the challenges are the increasing levels of complexity in the operation of the power system coupled with a dramatically changing generation of renewable sources, portfolio of high capacity generator units, wide variation in demand, planning of outages for generating units and transmission elements, real time incorporation of voluminous revisions from generators and DISCOMs, data acquisition on faster rate, assessment of transfer capabilities, flexibility to implement frequent changes in Regulations, issuance of bills, invoices and statements to all users timely and accurately etc. SLDC has set road map to meet these challenges. In , SLDC will be equipped with ABT software with Automatic Meter Reading (AMR) solutions. This software would be capable of handling thousands of SEM parameters and producing the reports in the quickest possible time. The entire job shall be carried out with the help of leading IT Company. SLDC Gujarat is planning to move forward to new WAMS technology using Digital Synchrophasor. This technology would improve operators visibility of the grid in a broader perspective and strengthen reliability. It will provide a dynamic status of the system at any given moment. This facilitates early detection of any forthcoming harmful event to the grid and responds to it, thereby, enhancing reliability and enabling the optimization of the resources safely. The synchrophasor technology provides complex quantity of data at a much faster rate, upto 10/25/50 samples per second time stamped and synchronised through GPS. In conclusion, it provides MRI view of the system instead of the X-ray view of the present system. SLDC has planned to install 25 Nos. of PMUs during the Financial Year and locations for the same have already been identified. The requisite analytics for this project are being developed by IIT-Mumbai as research project. I, on behalf of SLDC staff, take this opportunity to convey my sincere thanks to Shri S. K. Negi (Hon ble MD, GETCO) for providing an excellent guidance and invaluable support and being a Mentor all the time taking profound interest and boosting up morale of each individual working at SLDC. All our efforts in preparation of this Annual Report would rather go in vain if I fail to thank GERC, WRPC, WRLDC (POSOCO) and beneficiaries and all others related to grid operation for rendering their continuous support, active involvement and kind cooperation. With Best Regards, (B.B. Mehta) Chief Engineer 3

6 Table of Contents 1. INTRODUCTION Formation Functions SALIENT FEATURES OF THE GUJARAT GRID Installed Capacity Sector wise Fuel wise Transmission Network as on Distribution Companies in Gujarat DEMAND FACTS Month wise Maximum Demand Catered in MW Demand Variation on Festival Days Demand Variation on Diwali Festival Demand Variation on Uttarayan Festival Demand Variation on Holi - Dhuleti Festival ENERGY GENERATION FACTS Sector wise Energy Generation (in MUs) Month wise Energy Generation (MUs) Monthly Sector wise Energy Generation (MUs) Monthly Maximum Energy Catered in MUs in a Day State Generating Station wise Energy Generation for Year Thermal Units Gas Units Hydro Units Others RENEWABLE ENERGY GENERATION ABSORPTION Wind Energy Generation Facts Monthly Wind Energy Generation in MUs Month wise Maximum Wind Energy Generation in MWH Maximum Wind Energy Variation in a day in MWH during the month Hourly Wind Energy Injection Trend during the year Wind Farm Installation Vs Maximum hourly Energy Received Maximum variation in wind energy generation in MUs on two consecutive days More than 1300 MW Wind variation in a day

7 5.2 Solar Energy Generation Facts Month wise Solar Energy Installation Vs Maximum Solar Energy Injection Month wise Solar Energy Generation in MUs Month wise Maximum Solar Energy Generation in a day in MWH Month wise Maximum Solar Energy Generation in a day in MUs Days when more than 4.7 MUs Solar Energy was Injected into the Grid Days when less than 1.2 MUs Solar Energy was Injected into the Grid Hourly Solar Energy Generation Pattern Monthly Energy Received from Biomass DISCOM-WISE DEMAND FACTS DISCOM wise Energy Catered DISCOM wise Energy Catered in MUs for last three Financial Years Category wise Energy Supplied in MUs Category wise Energy Supplied by DISCOMs in MUs DISCOM wise Category wise energy supplied in MUs VOLTAGE PROFILE STATISTICS AT IMPORTANT NODES FREQUENCY PROFILE STATISTICS Monthly Average Frequency Trend for Last Three Financial Years Monthly Frequency Trend Comparisons GENERATION CAPACITY ADDITION Generation Capacity Addition during FY GRID EXPANSION EHV lines added in Gujarat Grid in year MAJOR INCIDENTS ENERGY ACCOUNTING & SETTLEMENT AND STOA DETAILS ABT Meters Registered for Data Processing at SLDC Nos. of UI Pool Members in UI Pool Account of SLDC Users Registered under REC Mechanisms Short Term Open Access Applications Processed THREE PHASE POWER SUPPLY TO AGRICULTURE SECTOR MONTHLY NETWORK LOSSES (%) SCADA & IT UPDATES Data Acquisition Updates IT Updates

8 16. FINANCIAL FACTS & FIGURES Aggregate Revenue Requirement for the FY Major Figures for the FY CAPEX Plan of SLDC FOCUS AREAS

9 1. INTRODUCTION 1.1 Formation As per Energy & Petrochemical Department, Government of Gujarat, Order No. GHU GEB K of 29 th May 2004, established the load despatch centre, Jambuva as State Load Despatch Centre, for purposes of exercising the power and discharging functions under section 31 of IEA Functions In accordance with section 32 of Electricity Act, 2003, the (SLDC) has to carry out following functions: a. SLDC has to ensure integrated operation of the power system in a State. b. SLDC is responsible for optimum scheduling and despatch of electricity within a State. c. Monitor grid operations; d. keep accounts of the quantity of electricity transmitted through the State grid; e. Exercise supervision and control over the intra-state transmission system; f. SLDC is responsible for carrying out real time operations for grid control and despatch of electricity within the State through secure and economic operation of the State grid in accordance with the Grid Standards and the State Grid Code. g. SLDC in a State may give such directions and exercise such supervision and control as may be required for ensuring the integrated grid operations and for achieving the maximum economy and efficiency in the operation of power system in that State. h. Every licensee, generating company, generating station, sub-station and any other person connected with the operation of the power system shall comply with the directions issued by the SLDC. i. The SLDC shall comply with the directions of the Regional Load Despatch Centre. j. In case of inter-state bilateral and collective short-term open access transactions having a state utility or an intra-state entity as a buyer or a seller, SLDC shall accord concurrence or no objection or a prior standing clearance. k. The following are contemplated as exclusive functions of SLDC. a. System operation and control covering contingency analysis and operational planning on real time basis; b. Scheduling / re-scheduling of generation; c. System restoration following grid disturbances; d. Metering and data collection; e. Compiling and furnishing data pertaining to system operation; f. Operation of state UI pool account, state reactive energy account. 7

10 2. SALIENT FEATURES OF THE GUJARAT GRID 2.1 Installed Capacity Sector wise Installed Capacity (MW) State Sector Private Sector Central Sector Wind Farm Solar Biomass Total Growth % As on As on As on State Sector Private Sector Central Sector Wind Farm Solar Biomass As on As on As on Fuel wise Period Thermal Gas Hydro Nuclear Solar Wind Farm Biomass Total As on As on As on Thermal Gas Hydro Nuclear Solar Wind Farm Biomass As on As on As on

11 2.2 Transmission Network as on Sr. No. Voltage Class No. of Substations As on As on Transmission Lines in Ckt. Km No. of Substations Transmission Lines in Ckt. Km KV KV KV /33 KV Total Distribution Companies in Gujarat Sr. No. Name of the Company Contracted Capacity as per LTA (in MW) as on PGVCL UGVCL DGVCL MGVCL TP AE Co TP SE Co. 7 KPT 7 8 Torrent SEZ - 9 MP SEZ - Total % PGVCL 13% 31% UGVCL DGVCL 26% 23% MGVCL TPAEC & TPSEC KPT 9

12 3. DEMAND FACTS 3.1 Month wise Maximum Demand Catered in MW Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar Contribution of Renewable Energy in Maximum Demand Catered Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar

13 MWH Annual Report Month wise Maximum catered, Minimum Catered & Maximum difference in a day handled by SLDC for FY Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar Max catered in MW Min catered in MW Max. diff between Max. and Min catered in a day 3.2 Demand Variation on Festival Days Demand Variation on Diwali Festival Date 11-Nov Nov NOV-12 DIWALI 14-Nov-12 NEW YEAR 15-Nov-12 BIJ 16-Nov Nov Nov-12 Total MWH Maximum Demand Minimum Demand Nov 13-Nov 14-Nov 15-Nov 18-Nov 11

14 MWH MWH Annual Report Demand Variation on Uttarayan Festival Date 13-Jan Jan-13 (Uttarayan) 15-Jan Jan-13 Total MWH Maximum Demand Minimum Demand Jan 14-Jan 15-Jan 16-Jan Demand Variation on Holi - Dhuleti Festival Date 25-Mar Mar-13 (Holi) 27-Mar-13 (Dhuleti) 28-Mar-13 Total MWH Maximum Demand Minimum Demand Mar 26-Mar 27-Mar 28-Mar 12

15 4. ENERGY GENERATION FACTS 4.1 Sector wise Energy Generation (in MUs) Year GSECL Private Sector Central Sector Wind Energy Solar Biomass Total MUs GSECL Private Sector Central Sector Wind Energy Solar Biomass Month wise Energy Generation (MUs) Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar

16 4.3 Monthly Sector wise Energy Generation (MUs) Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar GSECL Private Central sector Renewables 4.4 Monthly Maximum Energy Catered in MUs in a Day Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar Max Of Daily MUs Max Of Daily MUs 14

17 4.5 State Generating Station wise Energy Generation for Year Thermal Units THERMAL Unit Installed Capacity (MW) Derated Capacity (MW) Generation (MUs) GANDHINAGAR GTPS GTPS GTPS GTPS GTPS WANAKBORI WTPS WTPS WTPS WTPS WTPS WTPS WTPS UKAI(TH) UTPS UTPS UTPS UTPS UTPS UTPS SIKKA STPS STPS PANANDHRO KLTPS KLTPS KLTPS KLTPS TORRENT POWER AECO C AECO D AECO E AECO F SURAT LIGNITE SLPP SLPP SLPP SLPP AKRIMOTA ALPP ALPP APL APL APL APL APL APL APL APL APL APL Essar Vadinar EPGL EPGL Total Thermal Generation

18 4.4.2 Gas Units GAS Unit Installed Capacity (MW) Derated Capacity (MW) Generation (MUs) DHUVARAN GAS DTPS - GT DTPS -STG DTPS-GT DTPS-STG UTRAN UGPP GT UGPP GT UGPP GT UGPP ST UGPP GT UGPP ST GIPCL-I GIPCL GT GIPCL GT GIPCL GT GIPCL ST GIPCL-II GIPCL GT GIPCL ST TORRENT POWER GAS AECO GT AECO GT AECO STG ESSAR POWER ESSAR GT ESSAR GT ESSAR GT ESSAR SGT CLPIPL CLPIPL GT CLPIPL GT CLPIPL GT CLPIPL STG GSEG Stage-1 GSEG GSEG GSEG ST GSEG Stage-2 GT STG SUGEN SUGEN GT SUGEN GT SUGEN GT UNO SUGEN UNO SUGEN GPPCL GPPCL Total Gas Generation

19 4.4.3 Hydro Units HYDRO Unit Installed Capacity (MW) Derated Capacity (MW) Generation (MUs) UKAI(HY) UHPS UHPS UHPS UHPS UKAI LBCH ULBC ULBC KADANA KHPS KHPS KHPS KHPS PANAM PANAM PVT HY. MADHUBAN DAM MADHUBAN DAM Karjan Dam Total Hydro Generation Others Others Generation (MUs) CPP Wind Farm Solar Biomass Central Sector

20 5. RENEWABLE ENERGY GENERATION ABSORPTION 5.1 Wind Energy Generation Facts Monthly Wind Energy Generation in MUs Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar Month wise Maximum Wind Energy Generation in a day in MUs Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar Month wise Maximum Wind Energy Generation in MWH Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar

21 0 to 1 1 to 2 2 to 3 3 to 4 4 to 5 5 to 6 6 to 7 7 to 8 8 to 9 9 to to to to to to to to to to to to to to to Maximum Wind Energy Variation in a day in MWH during the month Annual Report Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar Hourly Wind Energy Injection Trend during the year Less than 200 MWH More than 500 MWH and less than 1000 MWH More than 200 MWH and less than 500 MWH More than 1000 MWH and less than 1500 MWH From the above, it is observed that the wind energy injection between 08:00 Hrs. to 15:00 Hrs. during the year is quite less Wind Farm Installation Vs Maximum hourly Energy Received Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar Installed Capacity Maximum Injection Installed Capacity Maximum Injection 19

22 0 to 1 1 to 2 2 to 3 3 to 4 4 to 5 5 to 6 6 to 7 7 to 8 8 to 9 9 to to to to to to to to to to to to to to to 24 MWH 0 to 1 1 to 2 2 to 3 3 to 4 4 to 5 5 to 6 6 to 7 7 to 8 8 to 9 9 to to to to to to to to to to to to to to to 24 MWH Annual Report Maximum variation in wind energy generation in MUs on two consecutive days Hrs (9.89 MUs) (21.97 MUs) (42.87 MUs) (24.53 MUs) More than 1300 MW Wind variation in a day Hrs (Max-1630, Min-236) (Max-1823, Min-355) (Max-1360, Min-31) (Max-1451, Min-58) (Max-1546, Min-153) (Max-1543, Min-237) (Max-1739, Min-426) (Max-1653, Min-125) 20

23 5.2 Solar Energy Generation Facts Month wise Solar Energy Installation Vs Maximum Solar Energy Injection Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar Installed Capacity Maximum Injection Installed Capacity Maximum Injection Month wise Solar Energy Generation in MUs Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar Month wise Maximum Solar Energy Generation in a day in MWH Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar

24 0 to 1 1 to 2 2 to 3 3 to 4 4 to 5 5 to 6 6 to 7 7 to 8 8 to 9 9 to to to to to to to to to to to to to to to 24 MWH 0 to 1 1 to 2 2 to 3 3 to 4 4 to 5 5 to 6 6 to 7 7 to 8 8 to 9 9 to to to to to to to to to to to to to to to 24 MWH Month wise Maximum Solar Energy Generation in a day in MUs Annual Report Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar Max Of Solar MUs Max Of Solar MUs Days when more than 4.7 MUs Solar Energy was Injected into the Grid Hrs 24-Feb Feb Mar Mar Mar Mar Days when less than 1.2 MUs Solar Energy was Injected into the Grid Jul Jul Jul Aug Aug-12 22

25 7 to 8 8 to 9 9 to to to to to to to to to to 19 Annual Report Hourly Solar Energy Generation Pattern Less than 100 MWH More than 200 MWH and less than 500 MWH More than 100 MWH and less than 200 MWH More than 500 MWH 5.3 Monthly Energy Received from Biomass Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar

26 Annual Report DISCOM-WISE DEMAND FACTS 6.1 DISCOM wise Energy Catered DISCOM wise Energy Catered in MUs for last three Financial Years PGVCL UGVCL MGVCL DGVCL SE CO AE CO 4% 9% 19% PGVCL UGVCL MGVCL DGVCL TPSEC TPAEC 32% 12% 24% 24

27 6.2 Category wise Energy Supplied in MUs IND AGR URB/TWN JGY Category wise Energy Supplied by DISCOMs in MUs 15% 36% JGY URB/TWN AGR 17% IND 32% 25

28 6.4 DISCOM wise Category wise energy supplied in MUs PGVCL MGVCL IND, 5991, 24% JGY, 4023, 16% IND, 3588, 37% JGY, 1844, 19% AG, 9729, 40% URB, 4907, 20% AG, 1198, 12% URB, 3067, 32% UGVCL DGVCL IND, 4944, 27% JGY, 2289, 12% URB, 1454, 8% JGY, 2149, 14% URB, 2328, 16% AG, 9645, 53% IND, 9567, 65% AG, 714, 5% 26

29 7. VOLTAGE PROFILE STATISTICS AT IMPORTANT NODES Substation Month No of days when bus voltage remained > 420 KV < 380 KV Maximum Voltage (KV) Minimum Voltage (KV) Kasor Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Asoj Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Jetpur Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar

30 Substation Month No of days when bus voltage remained > 420 KV < 380 KV Maximum Voltage (KV) Minimum Voltage (KV) Amreli Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Hadala Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Chorania Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar

31 Substation Month No of days when bus voltage remained > 420 KV < 380 KV Maximum Voltage (KV) Minimum Voltage (KV) Vadavi Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Soja Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Kansari Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar

32 % Annual Report FREQUENCY PROFILE STATISTICS 8.1 Monthly Average Frequency Trend for Last Three Financial Years Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar Avg Freq Avg Freq Avg Freq 8.2 Monthly Frequency Trend Comparisons Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar <49.50 Hz >49.50 Hz and <50.20 Hz Above HZ 30

33 9. GENERATION CAPACITY ADDITION 9.1 Generation Capacity Addition during FY Unit Capacity in MW GUVNL Share in MW Date of Maiden Sync Date of COD Essar Vadinar Unit Apr Jun-12 ACB India Ltd. Unit Feb Jun-12 CGPL UMPP Unit Jul Jul-12 Sipat Stage-I Unit Apr Aug-12 Sipat Stage-I Unit Dec May-12 UTPS Unit No Oct-12 CGPL UMPP Unit Oct Oct-12 UNO Sugen 03-Dec-12 CGPL UMPP Unit Dec Jan-13 VSTPS Unit No Jun Mar-13 NTPC Mauda Unit No Mar-13 CGPL UMPP Unit Mar Mar-13 GPPC Unit No. 2 (GT) 13-Mar-13 GPPC Unit No. 2 (STG) 26-Mar-13 Wind Farm Solar NTPC 17% CGPL 46% RE 20% Wind Farm 11% Solar 9% ACB 3% EPGL 14% 31

34 10. GRID EXPANSION 10.1 EHV lines added in Gujarat Grid in year Sr. No Name of Line / Equipment Date of Comissioning KV Morbi - Bhimasar line KV Lalpar - Bhimasar line KV D/C Halvad - Bhimasar line KV Sikka -Ranavav line LILO at 132 KV Bhomiavadar KV Jasdan-Theolia (Kalorana W/F) line No /132 KV 50 MVA ICT 4 at Achhalia KV Jetpur - Keshod line LILO at Shapur KV Tharad - Thavar line No KV Tharad - Thavar line No KV Mora - L&T line No KV Savarkundla - Otha line LILO at GPPC KV D/C Kawas - Navsari LILO at Navsari (PG) KV Jhanor - Navsari (PG) line No /220 KV 315 MVA ICT 1 at Navsari (PG) /220 KV 315 MVA ICT 2 at Navsari (PG) KV Kawas - Vav Line No.1 (Network topology changed at Kawas end) KV Mundra - Chorania line No. 1 LILO at Jetpur (Temporary arrangement) KV Kawas - Ichhaporer Line No.2 (Network topology changed at Kawas end) /132 KV 100 MVA ICT at Lalpar /132 KV 50 MVA ICT at Haldarva KV Dhoraji - Junagadh line LILO at Shapur /132 KV 100 MVA ICT at Shapur KV D/C Halvad - Hadala line KV D/C Tharad - Deodar line /132 KV 50 MVA ICT 4 at Limbdi KV Mundra - Jetpur line No KV Mundra - Jetpur line No kv Karjan - INOX line KV WCPGL - WELSPUN (GETCO) line /220 KV 315 MVA ICT 3 at Vapi (PG) KV 50 MVAR line reactor of 400 KV Chorania - Kosamba line No KV D/C Navsari (PG) - Vapi (PG) KV D/C Mota Gunda - Bhomiyavadar line KVGodhra -Dahod line LILO at 132 KV Limkheda KV Bhatia - Bhatia (220 KV) line No KV Kosamba - Gavasad line No KV Kosamba - Gavasad line No KV Bus at 220 KV Bhatia S/S /220 KV 315 MVA ICT No. 1 at 400 KV Halvad KV D/C Tharad - Amarapar (Kintech) line /132 KV 100 MVA ICT at 220 KV Bhatia KV Kosamba - Ukai (Th) line No KV Kosamba - Ukai (Th) line No

35 11. MAJOR INCIDENTS Sr. No. Date Time Hrs. Location Summary Load loss Gen loss (MW) :00 SLPP The outage of 220 KV SLPP Zagadia line No. 2 at 07:45 Hrs. and 220 KV SLPP Gavasad line No. 3 at 07:55 Hrs. were permitted for SRI replacement work. The tripping of 220 KV D/C Gavasad Kasor line from Kasor end, tripping of 220 KV SLPP Gavasad line No. 4 and 220 KV SLPP Zagadia line No. 1 from SLPP end within a matter of 1-2 minutes caused severe contingency condition for evacuation of power from SLPP thereby tripping all generators at SLPP complex. This has resulted in a generation loss of 483 MW :52 APL 400 KV APL Dehgam line 1 & 2 both tripped on Distance protection Z-1 & Z-2 respectively at APL end with simultaneous tripping of 400 KV side breaker of 400/220 KV, 315 MVA ICT-2 on LBB. APL unit 4 (running at 260 MW) tripped on MFT & unit 5 (running at 472 MW) tripped on SPS operation. The APL unit 3 (running at 314 MW) tripped on MFT due to tripping of coal feeder on voltage dip. There was a total generation loss of 1046 MW :22 APL 400 KV APL Dehgam line 1 tripped on Distance protection Z-1 at APL end. Subsequently, SPS provided for system security operated effectively. The APL unit 4 (running at 208 MW) & No. 5 (running at 488 MW) tripped on successive SPS operation. There was a total generation loss of 696 MW :33 APL ± 500 KV APL Mundra - Mohindergarh HVDC pole 1 with power order of 625 MW tripped on DC line fault. The pole trip signal was not picked up by RBS due to communication failure in data concentrator. The SPS provided for HVDC failed to operate. However, APL unit 3 (running at 257 MW) tripped on SPS provided for HVAC lines :15 APL APL Unit No. 3 tripped due to tripping of 400 KV APL - Sami section of 400 KV D/C APL - Dehgam lines and there was a generation loss of 261 MW

36 :00 SLPP At 12:00 Hrs, 220 KV SLPP Gavasad line No. 3 (Fault on location 311 Tension) & 220 KV SLPP - Zagadia line No. 1 both tripped concurrently. Entire associated network of SLPP Stage 1 tripped resulting into SLPP units 1 & 2 tripping. There was a generation loss of 233 MW :12 APL ± 500 KV APL Mundra - Mohindergarh HVDC pole 1 with power order of 630 MW tripped due to loss of auxiliary supply at Mohindergarh end. APL unit 9 (running at 492 MW) tripped on operation of run back scheme. APL unit 8 (running at 501 MW) tripped due to sudden increase in power flow through bus sectionalizer. There was a total generation loss of 993 MW :27 APL FSC-1 of 400 KV APL Dehgam line 1 tripped resulting into overloading of 400 KV APL Dehgam line 2, which initiated the operation of SPS provided for HVAC circuits. It caused tripping of APL unit 3 (running at 234 MW). There was a generation loss of 234 MW :22 APL 400 KV APL Dehgam line 2 tripped. APL unit 3 (running at 230 MW) tripped on SPS operation. There was a generation loss of 230 MW :49 APL ± 500 KV APL Mundra - Mohindergarh HVDC pole 1 with power order of 625 MW tripped on DC line fault. APL unit 9 (running at 519 MW) tripped on operation of run back scheme. There was a total generation loss of 519 MW :33 Northern region ± 500 KV APL Mundra - Mohindergarh HVDC pole 1 with power order of 593 MW got blocked because of AC network failure at Mohindergarh end. The APL unit 7 (running at 496 MW) & APL unit 9 (running at 371 MW) tripped on operation of run back scheme. Also, DGB - 2 (running 80 MW) tripped. There was a total generation loss of 947 MW

37 :08 CGPL Prior to 06:08 Hrs, 400 KV D/C Vadavi - Bhachau line & 400 KV Mundra - Chorania line - 1 were not available due to tripping. At 06:08 Hrs, with the tripping of 400 KV Mundra - Chorania line - 2, there was total constraint for evacuation of power from CGPL. Subsequently, CGPL unit 20 tripped and Unit 10 survived under house load. Later on, unit 10 also tripped at 07:05 Hrs. There was a generation loss of around 1500 MW :10 APL At 03:15 Hrs, 400 KV APL Dehgam line 1 tripped. Later on, at 04:00 Hrs. 400 KV APL Dehgam line 2 tripped. Subsequently, at 04:15 Hrs, ± 500 KV APL Mundra - Mohindergarh HVDC pole 1 with power order of 582 MW tripped and at the same time, APL unit 8 (running at 341 MW) & unit 9 (running at 346 MW) tripped on SPS & RBS. There was a total generation loss of 687 MW :02 NR, ER, NER grid collapse At 13:02 Hrs, ± 500 KV APL Mundra - Mohindergarh HVDC pole 1 with power order of 432 MW got blocked because of AC network failure at Mohindergarh end. The APL unit 7 (running at 494 MW) tripped on operation of run back scheme. At the same time, EPGL - 2 (running at 125 MW) & KLTPS - 2 (running at 69 MW) tripped. There was a total generation loss of 688 MW :59 APL APL Unit 9 (running at 400 MW) tripped due to tripping of 400 KV APL - Sami section of 400 KV APL - Dehgam lines 1 & 2. ± 500 KV APL Mundra - Mohindergarh HVDC Pole-1 with power order of 456 MW tripped on line fault. There was a generation loss of 400 MW :18 APL ± 500 KV HVDC Mundra Mohindergarh Pole-1 with power order 558 MW tripped. It led to SPS operation at APL. APL unit 7 (running at 362 MW) & APL unit 8 (running at 355 MW) tripped. The generation loss was 717 MW

38 :16 APL KV D/C APL-Sami-Dehgam lines were not available (on fault). 2. ± 500 KV HVDC Mundra Mohindergarh Pole-1 was out from Hrs. 3. At Hrs, 400 KV APL - Varsana line tripped due to bus fault at Varsana end. 4. At 04:16, APL Unit 1 (running at 188 MW) & APL Unit 5 (running at 330 MW) tripped :21 CGPL Bus fault at CGPL, Mundra occurred. CGPL unit -2 (running at 735 MW) tripped :19 APL 400 KV D/C APL - Dehgam line was not available & at Hrs, ± 500 KV HVDC Mundra Mohindergarh Pole-1 (loaded at 559 MW) tripped on DC line fault. It led to SPS operation at APL. APL unit 7 (running at 545 MW) tripped. The generation loss was 545 MW : KV Varsana :53 KLTPS, ALTPS Bus bar protection operated at Varsana leading to tripping of 400 KV APL - Varsana & 400 KV Varsana - Hadala lines. As a result, APL Unit 8 (running at 375 MW) tripped on SPS operation. 1. Since Hrs, 220 KV D/C KLTPS - Nakhatrana, 220 KV Akrimota - Nakhatrana & 220 KV Akrimota - Jamanvada - Nakhatrana were not in service due to bus fault at Nakhatrana S/S. 2. At Hrs, 220 KV Bus A of KLTPS tripped with 220 KV KLTPS - Kukma line No. 1. So, 220 KV KLTPS - Kukma line No. 2 only remained in service for evacuation of KLTPS & ALTPS power.3. At 2.53 Hrs, ALTPS & KLTPS generating station black out was reported due to tripping of 220 KV KLTPS Kukma line No. 2. ALTPS 1 (running at 90 MW), ALTPS 2 (running at 100 MW), KLTPS 1 (running at 55 MW) & KLTPS 4 (running at 59 MW) tripped. 4. At Hrs, 220 KV KLTPS - Kukma line No. 2 was taken into service & KLTPS station supply was normalized.5. At Hrs, the station supply of ALTPS was restored through 220 KV KLTPS - Akrimota line

39 : KV Shivlakha 220 KV Welspun 220 KV Anjar 220 KV Kukma 220 KV KLTPS 220 KV ALTPS 1. At 06:05 Hrs, 220 KV Morbi - Shivlakha line No. 1 tripped which caused black out at 220 KV Shivlakha, Welspun, Anjar, Kukma, Tappar S/S, KLTPS & ALTPS. 2. At 06:40 Hrs, 220 KV Morbi - Shivlakha line No. 2 was restored and later on power supply extended to Anjar (06.05 to 06.55), Kukma (06.05 to 07.28), Welspun (06.05 to 08.00), KLTPS (06.05 to 08.00) & ALTPS (06.05 to 08.17) :56 APL 400 KV D/C APL - Dehgam line was not available. At Hrs, ± 500 KV HVDC Mundra Mohindergarh Pole-1 (loaded at 620 MW) tripped on DC line fault. It led to SPS operation at APL. APL unit 7 (running at 532 MW) tripped (06:25 to 07:00) (06:25 to 06:52) 220 KV Morbi 220 KV Lalpar The post insulator of Y - ph isolator of 220 KV Transfer bay bus of Tr-3 flashed over at Morbi S/S. As a result, buses fault occurred and 220 KV Bhimasar - Lalpar line also tripped. It led to zero power at Morbi & Lalpar substations :22 APL At Hrs, ± 500 KV HVDC Mundra Mohindergarh Pole-1 (loaded at 645 MW) tripped on DC line fault. It led to SPS operation at APL. APL unit 8 (running at 555 MW) tripped :14 APL ± 500 KV APL Mundra - Mohindergarh HVDC Pole-1 (loaded at 630 MW) tripped. Same time, APL unit 7 (running at 370 MW) tripped on SPS :03 APL ± 500 KV APL Mundra - Mohindergarh HVDC Pole-1 (loaded at 550 MW) tripped. As a result, APL unit 7 (running at 496 MW) & APL unit 8 (running at 572 MW) tripped on SPS (05.06 to 05.30) At 05:06 Hrs. 400 KV Jetpur - Hadala line tripped. It led to tripping of 220 KV Gondal - Jetpur, 220 KV Vartej - Savarkundla & 220 KV Sagapara - Savarkundla line from Savarkundla end only. As a result, black out occurred at 400 KV Jetpur, 400 KV Amreli, 220 KV Dhasa, 220 KV Savarkundla, 220 KV Dhokadava, 220 KV Timbdi, 220 KV Keshod, 220 KV Shapur, 220 KV Sardargadh, 220 KV Motipaneli, 220 KV Visavadar substations

40 :51 APL ± 500 KV APL Mundra - Mohindergarh HVDC Pole- 1(loaded at 300 MW) tripped. APL unit 7 (running at 502 MW) & APL unit 8 (running at 372 MW) tripped on SPS :06 APL ± 500 KV APL Mundra - Mohindergarh HVDC Pole-1 (loaded at 642 MW) tripped. APL unit 7 (running at 461 MW) & APL unit 8 (running at 539 MW) tripped on SPS :17 UTPS R ph CT of 220 KV Ukai - Mota line 1 got burnt at UTPS end resulting in bus fault on 220 KV Bus -II. As a result, UTPS 1 (running at 89 MW), UTPS 3 (running at 200 MW), UTPS 4 (running at 143 MW) and UHPS 1 (running at 74 MW) tripped :57 APL Prior to tripping of HVDC Pole, the 400 KV D/C APL - Dehgam line was not available. At Hrs, ± 500 KV HVDC Mundra - Mohindergarh Pole-1 (loaded at 620 MW) tripped. It led to SPS operation at APL. APL unit 8 (running at 390 MW) & APL unit 9 (running at 547 MW) tripped (03:43 to 04:00) 220 KV Nakhatrana Since Hrs, power to 220 KV Kukma S/S was being fed through 220 KV KLTPS - Kukma line No. 1 At Hrs, bus fault (PI flash over) occurred on 220 KV Bus - 1 at Nakhatrana S/S. Later on, it was cleared at Hrs. At Hrs, bus fault (Wave trap suspension string of KLTPS 2 line flashed over) occurred on 220 KV Bus - 2 at Nakhatrana S/S. As a result, the evacuation network got distressed and KLTPS 1 (running at 40 MW), KLTPS 4 (running at 49 MW) & ALTPS 1 (running at 104 MW) tripped. With the tripping, black out occurred at 220 KV Nakhatrana, Kukma and Jamanvada S/S The restoration was done through 220 KV Nakhatrana - Jamanvada - Akrimota - KLTPS - Kukma route (06.50 to 07.05) 220 KV Kukma 220 KV Anjar The 220 KV Shivlakaha - Anjar (from 3.30), 220 KV KLTPS - Kukma line 2 (from 05.46) were out due to tripping. At Hrs, 220 KV KLTPS - Kukma line 1 tripped and in reflection 220 KV Welspun - Anjar line tripped. It led to zero power at Kukma & Anjar S/S. Power was restored through 220 KV Welspun - Anjar line to Anjar & Kukma S/S

41 :26 & 18:52 KLTPS At Hrs, bus fault occurred (R ph PI support of reactor bay flashed over) on Bus 2. It led to tripping of KLTPS unit 4 (running at 48 MW). Later on, at Hrs, bus fault occurred (B ph 89A isolator PI of Nakhatrana - 1 line flashed over) on Bus 1. It led to tripping of KLTPS unit 1 (running at 61 MW) & KLTPS unit 2 (running at 64 MW) :00 STPS At Hrs, bus fault occurred on Bus-A (PI of Dhrol feeder flashed over). It led to tripping of STPS 1 (running at 84 MW) & STPS 2 (running at 91 MW) :25 APL ± 500 KV APL Mundra - Mohindergarh HVDC Pole-1 (loaded at 619 MW) tripped. APL unit 9 (running at 565 MW) tripped on SPS :25 APL ± 500 KV APL Mundra - Mohindergarh HVDC Pole-1 (loaded at 621 MW) tripped. APL unit 9 (running at 566 MW) tripped on SPS :40 Jetpur Prior to tripping of 400 KV Hadala - Jetpur line, 220 KV Gondal - Kangashiyali, 400 KV Chorania - Amreli - Jetpur lines were out. The tripping of 400 KV Hadala - Jetpur led to excessive over loading on 220 KV Hadala - Nyara D/C, 220 KV Chorania - Gondal & 220 KV Rajkot - Jetpur lines. Subsequently, bus fault occurred on 220 KV Bus - 1 (Jumper of 220 KV Rajkot line bay snapped). To control loading on remaining network, immediately load restrictions measures were enforced. At Hrs, 400 KV Chorania - Hadala line tripped causing excessive over loading of 220 KV D/C Hadala - Nyara, 220 KV Kasor - Botad, 220 KV Karamsad - Vartej and 220 KV Chorania - Gondal lines. To control loading on these circuits, load shedding 600 MW was imposed. 600 MW L/S :40 ALTPS The outage of 220 KV Panandhro - Akrimota line was taken at Hrs. to attend hot point at KLTPS end. Later on at Hrs, 220 KV Akrimota - Jamanvada & 220 KV Akrimota - Nakhatrana line (earth wire broken on loc. Nos. 164 to 166) tripped. As a result, ALTPS 1 (running at 100 MW) & ALTPS 2 (running at 110 MW) tripped :54 APL ± 500 KV APL Mundra - Mohindergarh HVDC Pole-1 (loaded at 600 MW) tripped. APL unit 9 (running at 560 MW) tripped on SPS

42 :52 APL At Hrs, both the 400 KV APL - Sami - Dehgam lines tripped leading to tripping of APL unit 8 (running at 550 MW) on SPS :43 UHPS KV D/C UTPS - UHPS line were switched OFF by SLDC to control loading on 220 KVD/C Ukai - Mota line and all the generation of UHPS was evacuated through 220 KV D/C UHPS - Achhalia line.2. At Hrs, 220 KV UHPS - Achhalia line No-1 (Achhalia end Z1 B-E, UHPS end Z1 B-E) tripped. In reflection, 220 KV UHPS - Achhalia line No.-2 also tripped at Achhalia end only. As a result, the evacuation network got distressed and led to tripping of all UHPS units :54 WTPS At Hrs, bus fault occurred at WTPS end causing tripping of all 220 KV feeders connected to WTPS. Same time WTPS-1 (running at 148 MW) & WTPS-5 (running at 167 MW) tripped :03 ± 500 KV HVDC Pole ± 500 KV HVDC Mundra Mohindergarh Pole-1 with power order 628 MW tripped. It led to SPS operation at APL. APL unit 7 (running at 547 MW) & APL unit 9 (running at 378 MW) tripped. The generation loss was around 925 MW :35 ALTPS At Hrs. 220 KV KLTPS - ALTPS line tripped due to R - Phase conductor broken between Location 1 & 2. In reflection, 220 KV Akrimota - Jamanvada line and 220 KV Akrimota - Nakhatrana line (From Akrimota end only) also tripped. As a result, the evacuation network got distressed and led to tripping of both ALTPS units. At Hrs., power supply was restored through 220 KV Akrimota - Nakhatrana line :07 ± 500 KV HVDC Pole ± 500 KV HVDC Mundra Mohindergarh Pole-2 tripped because of card failure in HVDC control. Before smooth transfer of power from pole-2 to pole-1, the SPS logic of rate of change of power through bus sectionlizer got activated. It was resulting in to tripping of APL Unit No. 8 (running at 560 MW). Then, HVDC pole-1 was carrying@ 900 MW with only Unit no 7 of stage-iii running with 500 MW. As a result, the SPS logic of reverse power protection installed on bus sectionalizer got activated thereby sending trip command to ± 500 KV HVDC Mundra Mohindergarh Pole

43 : KV Bhilad At Vapi (PG) substation, none tripping of 220 KV Vapi (PG) - Magarvada line 1 bkr resulted into 220 KV Bus-1 tripping. 400/220 KV, 315 MVA ICT - 1 and 220 KV Vapi - Vapi (PG) line connected to 220 KV Bus-1 at Vapi (PG) also got tripped. It resulted in overloading of remaining ICT of Vapi (PG) & GETCO system. Within few seconds, the ICT-2 at Vapi (PG) also tripped and whole load of DD / DNH got transferred to GETCO Bhilad substation. Subsequently at Bhilad S/S, the R-Ph fly-over dropper jumper of 220 KV Bhilad-Tarapur line detached from clamp. Also, all 220 KV feeders connected to Bhilad S/S tripped. As a result, zero power condition occurred at Bhilad S/S :02 UTPS At 18:02 Hrs, HV side, Y-phase Lightning Arrestor of 220/400 KV 315 MVA ICT at UTPS flashed over. At the same time, LBB protection for Bus-II operated and all feeders connected to Bus-II tripped form UTPS end only. With the tripping of Bus-II, Unit No. 3 tripped. It resulted into generation loss of 150 MW :44 UTPS At Hrs, all feeders connected to 220 KV Bus-I tripped which resulted into black out at UTPS. The reason of Bus-I tripping under LBB protection is still under investigation by Ukai TPS. It led to tripping of UTPS Unit No. 2 & 4. Generation loss of 265 MW occurred :57 ± 500 KV HVDC Mundra - Mohindergarh pole 1 & 2 tripping At Hrs, all outgoing feeders at Mohindergarh end tripped resulting into blackout at Mohindergarh. It led to tripping of both the poles of ± 500 KV HVDC Mundra - Mohindergarh line. As a result, SPS operated at APL end and APL unit No. 7 (running at 562 MW) and APL Unit No. 9 (running at 505 MW) tripped

44 : KV S/S Vapi At 10:11Hrs, B-Ph jumper (between breaker and CT) of 220 KV Vapi - Vapi (PG) line (connected to Bus-B) detached from B-phase pole and fell on the ground. The line breaker tripped on DPS, Z-1, B-E, Dist: 3.0 Km, but, at the same time B phase breaker pole didn t trip. It led to LBB protection operation and all 220 KV feeders connected to Bus- B tripped. In reflection of fault, 220 KV Vapi - Bhilad and 220 KV TAPS Vapi line connected with Bus-A had undergone the racing with LBB Operation of Bus-B and tripped with back-up relay from far end. However, the 220 KV KAPP-Vapi line No. 1 didn t trip. It resulted into load loss of 300 MW :49 ± 500 KV HVDC Mundra - Mohindergarh pole 1 & 2 tripping At Hrs, all outgoing feeders at Mohindergarh end tripped resulting into blackout at Mohindergarh. It led to tripping of both the poles of ± 500 KV HVDC Mundra - Mohindergarh line. As a result, SPS operated at APL end and APL unit No. 7 (running at 422 MW) and APL Unit No. 8 (running at 509 MW) tripped : KV Pirana (Torrent) : KV S/S Kim Prior to occurrence, 400 KV Sugen Uno Sugen line was under outage from 13:35 Hrs for PMU installation. At 14:35 Hrs, 400 KV Sugen-Pirana (Torrent) line tripped on Z1 Y-B. At the same time, both the 400 KV Pirana (T)-Pirana (PG) lines tripped from both the ends resulting into blackout at Pirana (Torrent). It led to load loss of 135 MW. Prior to occurrence, the loading on each 220 KV Kim-Sugen line was 128 MW. At 12:38 Hrs, 220 KV Sugen-Kim line No. 1 tripped. It led to over loading of 220 KV Sugen-Kim line No. 2 and B-Phase bus isolator jumper of 220 KV Sugen-Kim line No. 2 got detached resulting into 220 KV Bus-B fault. As a result, all feeders connected to 220 KV Bus-B tripped. It led to tripping of all 220/66 KV transformers at Kim S/S. There was load loss of around 160 MW. At 12:50 Hrs, all load was restored

45 :59 APL KV APL- Sami section-1 tripping and subsequent operation of SPS :29 APL Tripping of FSC of 400 KV APL- Sami- Dehgam line No :55 APL Tripping of FSC of 400 KV APL- Sami- Dehgam line No :38 APL Tripping of FSC of 400 KV APL- Sami- Dehgam line No. 2 Prior to occurrence, the loading on each 400 KV APL-Dehgam line was around 593 MW. APL Unit 2 & 9 were not on bar. Total generation of APL complex was around 3200 MW. Flow on HVDC was 990 MW. Power flow from APL Stage-4 to APL Stage-3 was only 130 MW. At 16:59 Hrs, 400 KV APL-Sami section-1 tripped. It resulted in overloading of 400 KV APL-Sami section-2 and operation of SPS. As a result, APL Unit No. 4 (running at 308 MW) & APL Unit No. 8 (running at 559 MW) tripped. There was a generation loss of 867 MW. Prior to occurrence, the loading on each 400 KV APL-Dehgam line was around 638 MW. APL Unit 2 was not on bar. Total generation of APL complex was 3219 MW. Flow on HVDC was 1303 MW. Power flow from APL Stage-4 to APL Stage-3 was 33 MW. At 1529 Hrs, FSC of 400 KV APL-Dehgam line No. 1 tripped. It resulted in overloading of 400 KV APL-Sami section-2 and operation of SPS. As a result, APL Unit No. 4 (running at 225 MW) & APL Unit No. 7 (running at 367 MW) tripped. There was a generation loss of 592 MW. Prior to occurrence, the loading on each 400 KV APL-Dehgam line was around 627 MW. APL Unit 2 was not on bar. Total generation of APL complex was 3315 MW. Flow on HVDC was 1303 MW. Power flow from APL Stage-4 to APL Stage-3 was 239 MW. At 15:55 Hrs, FSC of 400 KV APL-Dehgam line No.1 tripped. It resulted in overloading of 400 KV APL-Sami section-2 and operation of SPS. As a result, APL Unit No. 4 (running at 225 MW) & APL Unit No. 8 (running at 470 MW) tripped. There was a generation loss of 695 MW. Prior to occurrence, the loading on each 400 KV APL-Dehgam line was around 639 MW. APL Unit 2 was not on bar. Total generation of APL complex was 3425 MW. Flow on HVDC was 1302 MW. Power flow from APL Stage-4 to APL Stage-3 was 231 MW. At 14:39 Hrs, FSC of 400 KV APL-Dehgam Line No. 2 tripped. It resulted in overloading of 400 KV APL-Sami section-1and operations of SPS. As a result, APL Unit No. 4 (running at 311 MW) & APL Unit No. 7 (running at 432 MW) tripped. There was a generation loss of 743 MW

46 12. ENERGY ACCOUNTING & SETTLEMENT AND STOA DETAILS 12.1 ABT Meters Registered for Data Processing at SLDC No. of ABT Meters Registered As on As on Nos. of UI Pool Members in UI Pool Account of SLDC No. of UI Pool Members in UI Pool account of SLDC As on As on Users Registered under REC Mechanisms No. of Users registered under REC Mechanism As on As on Short Term Open Access Applications Processed Year Short Term Open Access Applications Statistics No. of Application Received No. of Application Approved No. of Application Rejected

47 13. THREE PHASE POWER SUPPLY TO AGRICULTURE SECTOR 08:00 08:00 08:00 08:00 08:00 08:17 09:12 08:58 10:00 10:00 10:00 10:00 10:00 10:00 10:00 10:00 08:00 08:00 08:00 08:00 08:00 08:00 08:00 08:00 Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar MONTHLY NETWORK LOSSES (%) Apr May June July Aug Sept Oct Nov Dec Jan Feb Mar

48 15. SCADA & IT UPDATES 15.1 Data Acquisition Updates No of RTUs RTU Category As on As on Generating station and Substation Level Solar OA consumer Wind Farm Pooling Stn The Gujarat network is modelled more accurately in power system network analysis module. It is very much helpful for critical outage security assessment IT Updates a. Network is modelled upto 132 KV level in PSSE/E software. b. SLDC has planned to install 17 Nos. of RTUs for better system visibility. c. Real time Renewable Energy (Solar & wind) generation data is integrated with existing system and posted on the website. d. Total 38 Nos. of Support centre cases were communicated to GE and resolved for various SCADA improvements. e. Total 130 Nos. of PNA cases were run for outage / contingency study. f. Wi-fi facility has been established successfully. g. Cyber security monitoring with the help of admin based antivirus for intranet and for laptops is established. h. Voice logger facility has been provided for recording of operation communication. i. Establishment of video conferencing facility between SLDC-WRLDC/NLDC is done. j. Revamping of SLDC website has been done. k. Data backup facility has been provided to all departments. l. In-house software programme has been developed for auto update of bi-lateral consumers and reactive charges for operational purpose. m. Reactive energy validation software programme has been developed for ABT. n. Separate ABT LAN installation has been done by configuring virtual LAN with provision of Layer-3 switch. 46

49 16. FINANCIAL FACTS & FIGURES 16.1 Aggregate Revenue Requirement for the FY SLDC is filing its Aggregate Revenue Requirement (ARR) independently from the FY First ARR was filed in Jan 2010 and since then SLDC has not looked back and achieved new feats towards becoming financially self-sufficient. A glimpse of the ARR for the FY is given below : Particulars Proposed by SLDC Rs. In Lacs Approved by Hon'ble GERC Employee Cost Repairs & Maintenance Admin & General Expenses Interest on Working Capital RLDC Fees and Charges Charges for ULDC & Other related projects WAM Charges Less : Other Income Operating Cost Budget (a) 2, , Depreciation Interest & Finance Charges Return on Equity Total Fixed Cost Less : Expenses Capitalized - - Add : Provision for Tax Capital Cost Budget (b) Total Revenue Budget 2, , On the basis of the above, tariff rates decided by Hon ble GERC for SLDC is are : SLDC Charges and Fees for the FY SLDC Operating Charges Budget Rs./Lakh 1, Add : Revenue Gap (True-up ) Rs./Lakh Total Operating Charges Budget Rs./Lakh 1, Total Generation Capacity (Gujarat) MW 1, Total Allocation (including Central Sector) MW 23, Total Capacity MW 25, SLDC Charges Rs./MW/Month SLDC Capital Charges Budget Rs./Lakh Less : Revenue Surplus (True-up ) Rs./Lakh Total Capital Charges Budget Rs./Lakh SLDC Fees Rs./MW/Half-Year Grid Connection Fee Rs. 10,

50 16.2 Major Figures for the FY As per GERC directive, SLDC gets its Final Accounts audited from a Chartered Accountant from the FY SLDC is near to closing its financial books for the FY after which it will be presented before a Charted Accountant for Statutory Audit; however, some major unaudited figures for the FY are as below : Rs. In Lacs Particulars Amount Income : SLDC Charges 1, SLDC Fees STOA Scheduling STOA Application Miscellaneous Income Total 3, Particulars Amount Expenses : Repairs & Maintenance* Employee Cost Admin & General Expenses Depreciation Finance Charges 5.50 Loss on Sale 0.89 Total 2, * Including ULDC Charges The above figures are subject to provision entry of Terminal benefits such as Gratuity, Leave Encashment, Finance Charges and any rectification entry arising out of audit of the FY