3.2. Confirmation of Current Status and Issues Relating to Operation and Maintenance Recent Status of Power Generation in Java-Bali Regions

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1 3.2. Confirmation of Current Status and Issues Relating to Operation and Maintenance Thermal Power Stations Recent Status of Power Generation in Java-Bali Regions In Java-Bali regions as a whole, the power generating patterns from Monday through Friday are as shown in Figure and the light-up time zone is 17:00 to 18:00 hours and the peak time zone is 17:00 to 22:00 hours. However, the peak time zone in Jakarta-Banten area is 09:00 to 22:00 hours. Most of the thermal power stations of Indonesia Power and PJB perform operation without using governor-free function although the Grid Code (PLN s technical standard) provides that governor-free operation be performed. It is recommended that frequency fine-tuning operation utilizing the governor-free function be performed so that frequency can be stabilized. However, in case the above function is utilized, it is necessary to put the overload preventing security device into usable condition. * The Japanese electric power companies perform function confirmation tests of the security device to safely stop units as frequently as once a month. Source ; INDONESIA POWER data Figure Daily Load Curve in Java-Bali Regions (22 August, 2006) 3-57 Final Report

2 Operation Records Figure shows the annual operation records of Year 2004 seen from the viewpoint of operation hours of the thermal power stations under the study. Figure also covers 3 hydraulic power stations for reference. The following can be observed from this Figure ) Gilimanuk Power Station recorded the highest operating rate of 95.5% among the twelve thermal power stations. 2) In Java Island, PLTU Unit is basically in charge of the base load and PLTGU and PLTG Units are in charge of the peak load. In Bali Island, Gilimanuk P/S is in charge of the base load and Pesanggaran P/S and Pemaron P/S are in charge of the peak load. 3) Currently, the five highest ranking power stations in operating hours (ratios) are as stated below. Except Gilimanuk Power Station, PLTU power stations which are in charge of the base load are in the higher ranks followed by PLTGU power stations which are in charge of the peak load. This order is line with ELD (Economical Load Dispatcher) No. P/S Type Location Average SH 1 Gilimanuk PLTG Bali 92.4% 2 Suralaya PLTU (Coal) Jakarta-Banten 89.4% 3 Perak PLTU (MFO) Java-East 82.6% 4 Paiton PLTU (Coal) Java-East 82.5% 5 Gresik PLTGU+PLTG Java-East 72.9% 4) As for forced outage, the five highest ranking power stations with short outage times (ratios) are currently as shown below. The smallest forced outage ratio of 0.2% corresponds to 18 outage hours (=8,760 hrs 0.2%), while the highest outage was 3.7% recorded at Perak P/S. This corresponds to the annual outage hours of 324 hours. Thus, at this moment the forced outage hours vary from 18 hours to 324 hours. The forced outage hours tend to increase also in No. P/S Type Location Average FOH (D) 1 Pemaron PLTG Bali 0.2% 2 Gilimanuk PLTG Bali 0.3% 3 Tanjung Priok PLTGU + PLTG (+PLTU) Jakarta-Banten 0.7% 4 Gresik PLTGU + PLTG + PLTU Java-East 0.9% 5 Tambak Lorok PLTGU + PLTU Java-Central 0.9% 5) Both IP and PJB, which are power generating companies, have no obligation to make accident reports to PLN but have to submit a direct report to Board of PLN and press conference. They have to make finance status reports to PLN. Final Report 3-58

3 Gilimanuk P/S Gresik P/S Saguling P/S % 20% 40% 60% 80% 100% 0% 20% 40% 60% 80% 100% 0% 20% 40% 60% 80% 100% SH POH MOH FOH (D) FOH(L) RSH SH POH MOH FOH (D) FOH(L) RSH SH POH MOH FOH (D) FOH(L) RSH Suralaya P/S Tambak Lorok P/S Grati P/S % 20% 40% 60% 80% 100% 0% 20% 40% 60% 80% 100% 0% 20% 40% 60% 80% 100% SH POH MOH FOH (D) FOH(L) RSH SH POH MOH FOH (D) FOH(L) RSH SH POH MOH FOH (D) FOH(L) RSH Perak P/S Tanjung Priok P/S Sudirman P/S % 20% 40% 60% 80% 100% 0% 20% 40% 60% 80% 100% 0% 20% 40% 60% 80% 100% SH POH MOH FOH (D) FOH(L) RSH SH POH MOH FOH (D) FOH(L) RSH SH POH MOH FOH (D) FOH(L) RSH Paiton P/S Muara Tawar P/S Pesanggaran P/S % 20% 40% 60% 80% 100% 0% 20% 40% 60% 80% 100% 0% 20% 40% 60% 80% 100% SH POH MOH FOH (D) FOH(L) RSH SH POH MOH FOH (D) FOH(L) RSH SH POH MOH FOH (D) FOH(L) RSH Pemaron P/S (PLTG) Cirata P/S (PLTA) Muara Karang P/S (PLTGU + PLTU) Sutami P/S (PLTA) SH SH SH SH POH POH POH POH MOH MOH MOH MOH FOH (D) FOH (D) FOH (D) FOH (D) FOH(L) FOH(L) FOH(L) FOH(L) RSH RSH RSH RSH Total Total Total Total Note: PLTU : Conventional thermal power station (Oil-fired Power Station and Coal-fired Power Station or block) SH: Service Hours PLTG: Gas turbine thermal power station (or block) POH: Planned Outage Hours PLTGU: Combined Cycle power station (or block) MOH: Maintenance Outage Hours PLTD: Diesel Power Station (or block) FOH (D): Forced Outage Hours caused by power station PLTA: Hydro power station FOH(L): Forced Outage Hours caused by power grid system RSH: Reserve Shutdown Hours (=Stand by) Source: Developed by the JICA Study Team based on the provided data by each power station Pe maro n P/S Gilimanuk P/S (PLTG) Tanjung Priok P/S (PLTGU+PLTG+PLTU) SH SH POH POH MOH MOH FOH (D) FOH (D) FOH(L) FOH(L) RSH RSH Total Total % 20% 40% 60% 80% 100% SH POH MOH FOH (D) FOH(L) RSH Cirata P/S Suralaya P/S (PLTU) Muara Tawar P/S (PLTGU + PLTG) SH SH POH POH MOH MOH FOH (D) FOH (D) FOH(L) FOH(L) RSH RSH Total Total SH POH MOH FOH (D) FOH(L) RSH Perak P/S (PLTU) Saguling P/S (PLTA) SH SH POH POH MOH MOH FOH (D) FOH (D) FOH(L) FOH(L) RSH RSH Total Total Muara Karang P/S Paiton P/S (PLTU) Grati P/S (PLTGU +PLTG) % SH SH POH POH MOH MOH FOH (D) FOH (D) FOH(L) FOH(L) RSH RSH Total Total % 20% 40% 60% 80% 100% SH POH MOH FOH (D) FOH(L) RSH Sutami P/S Gresik P/S (PLTGU + PLTG + PLTU) Sudirman P/S (PLTA) SH SH POH POH MOH MOH FOH (D) FOH (D) FOH(L) FOH(L) RSH RSH Total Total % 20% 40% 60% 80% 100% SH POH MOH FOH (D) FOH(L) RSH Tambak Lorok P/S (PLTGU + PLTU) Pesanggaran P/S (PLTG + PLTD) SH SH POH POH MOH MOH FOH (D) FOH (D) FOH(L) FOH(L) RSH RSH Total Total Figure Annual Operation Performance Relating Hours (%) for Objective Power Stations 3-59 Final Report

4 It is recommended that PLN and MEMR develop Regulation on power generation facility related accident reports aiming to more actively participate in the operation and maintenance of power stations. In order to reduce forced outage hours and increase power generation energy, it is essential to tackle the following and prevent repetition of similar accidents. For example, < Tasks for scheduled inspection work > 1 As for equipment which have repeatedly experienced similar accidents, it is important that the maintenance such as thorough inspection and adjustments are performed as intensive monitoring equipment during the scheduled inspection work period. 2 It is also important to make efforts to reduce the work period and ensure high operation ratio of the unit through rationalization of the scheduled inspection work. < Tasks for the prevention of routine accidents > It is crucial to promptly study measures against unexpected accidents such as Irregular Frequency and System Faults. For example, < Operational aspect > a. Education and training of troubleshooting of the unit utilizing simulators are considered to be the most effective. b. It is necessary to regularly conduct function checking tests of security devices to safely stop the plants in case of the unit trips. < Maintenance aspect > a. Since insufficient repairs frequently occur due to delay in procuring materials, it is necessary to establish a material management system to promptly cope with accidents by utilization of IT. b. It is very important to make efforts to prevent deterioration of facilities by means of predictive and preventive maintenance performed by IP and PJB power stations. c. It is essential to promote improvement of the skills of the thermal power staff and promote information sharing. Final Report 3-60

5 Numbers of Outage Times and Hours (from 2003 to 2005) The number and hours of forced outages are analyzed including the causes as mentioned later for 75 units (PLTU: 23, PLTG: 12, PLTGU: 40) among the objective thermal power stations. As for details, please refer to Table and Table (1) Number of outages and hours by unit type The numbers of outages and hours during the three years from 2003 to 2005 are as shown below 4. Table Forced Outage (Times) for Thermal Power Stations Type Total PLTU PLTG PLTGU ,042 Total , PLTU PLTG PLTGU Total Numbers of Forced Outages are too many and have been increasing in the past 3 years. Sources : INDONESIA POWER & PJB data Table Forced Outage (Hours) for Thermal Power Stations 20,000 18,000 18,443 Type Total 16,000 14,000 12,000 13,446 14,823 PLTU 2,600 5,158 9,318 17,076 PLTG 678 1,239 1,010 2,927 PLTGU 10,168 8,426 8,115 26,709 10,000 8,000 10,168 8,426 9,318 8,115 Total 13,446 14,823 18,443 46,712 6,000 4,000 2,000-5,158 2, ,239 1, PLTU PLTG PLTGU Total Forced Outage Hours are also too many and have been increasing in the past 3 years. Sources : INDONESIA POWER & PJB data 4 The electricity-related accidents for hydropower stations and thermal power stations for 2004 in Japan are 115 and 72 respectively for your reference (Source: nuclear and Industrial Safety Agency, METI) Final Report

6 (2) Number of outages by unit type The numbers of forced outages by unit type during the three years from 2003 to 2005 are as shown below. Table Causes of Forced Outage Code % Times A: Instrumentation and Control A 40.4% 157 B: Turbine/Generator B 20.3% 79 C: Boiler and Auxiliaries C 27.5% 107 D: Cable/Relay D 3.3% 13 E: Inerter E 0.5% 2 F: Transformer F 0.5% 2 G: System Fault or Irregular Frequency G 4.1% 16 H: Others H 3.3% 13 Total 100.0% % 40.0% 30.0% 20.0% 10.0% 0.0% 40.4% 20.3% 27.5% 3.3% Number of Forced Outages (Times) for PLTU 0.5% 0.5% 4.1% 3.3% A B C D E F G H Dominant causes are: - I & C : 40.4% (e.g.) MFT Trip Drum Level High/Low Furnace Draft Press. High/Low Flame Out Trip - Boiler & Auxiliaries: 27.5% (e.g.) Boiler/Tube Leak - Turbine & Generator: 20.3% (e.g.) Balancing Turbine/Generator Sources : INDONESIA POWER & PJB data Table Number of Forced Outages (Times) for PLTG Causes of Forced Outage Code % Times A: Instrumentation and Control A 50.0% 94 B: Turbine/Generator B 36.2% 68 C: Cable/Relay C 3.7% 7 D: Electrical Fault or Irregular Frequency D 2.7% 5 E: System Fault or Irregular Frequency E 3.7% 7 F: Derating F 3.2% 6 G: Others G 0.5% 1 Total 100.0% % 50.0% 40.0% 50.0% 36.2% Dominant causes are: - I & C : 50.3% (e.g.) Ignition Trouble Temperature Control Trouble Flame Out Trip - Turbine & Generator: 36.2% (e.g.) Balancing Turbine/Generator Exciter System Trouble 30.0% 20.0% 10.0% 0.0% 3.7% 2.7% 3.7% 3.2% 0.5% A B C D E F G Sources : INDONESIA POWER & PJB data Final Report 3-62

7 Table Number of Forced Outages (Times) for PLTGU Causes of Forced Outage Code % Times A: Instrumentation and Control A 36.8% 383 B: Turbine/Generator B 17.9% 186 C: HRSG and Auxiliaries C 10.4% 108 D: Relay D 1.2% 12 E: 6kV Bus E 0.8% 8 F: UPS System F 0.3% 3 G: Electrical G 1.1% 11 H: System Fault or Irregular Frequency H 7.4% 77 I: Derating I 14.6% 152 J: Others J 9.7% 101 Total 100.0% % 40.0% 30.0% 20.0% 10.0% 0.0% 36.8% 17.9% 10.4% 1.2% 0.8% 0.3% 1.1% 14.6% 9.7% 7.4% A B C D E F G H I J Dominant causes are: - I & C : 36.8% (e.g.) Exhaust Temperature High Flame Out Trip Ignition Trouble - Turbine & Generator: 17.9% Condenser Plugging Starting Motor Trouble - HRSG & Auxiliaries: 10.4% (e.g.) Exhaust Dumper Trouble Sources : INDONESIA POWER & PJB data The numbers of forced outages of PLTU, PLTG and PLTGU Units tend to increase year after year due mainly to accidents and troubles of Instrument & Control and Turbine & Generators. -The numbers of forced outages (times) due to failure of Instrument & Control is large because of repetitive occurrence of similar accidents due to unsatisfactory combustion adjustments and ABC adjustments (to specified temperature, pressure, etc.). In order to prevent recurrence of such accidents, it is essential to study alteration of the control circuits and be sure to perform combustion adjustments and ABC adjustments, etc. at scheduled inspection work. Since similar accidents also repetitively occurred on turbines/generators, it is necessary to thoroughly make the balance adjustments during scheduled inspection work. -In order to prevent repetitive occurrence of similar accidents and oversight of inspection during scheduled inspection, it is necessary to review and reinforce the current scheduled inspection system. -In order to promptly cope with accidents of the facilities, it is essential to review the education and training for trouble-shooting of the units utilizing simplified simulators (new installation) and current material procurement management system. -The following should be tackled in earnest as measures to prevent deterioration of the facilities. Facility maintenance and management aiming to expand not only the exclusive diagnosing technique but also the definition of CBM (Condition Based Monitoring) including routine inspection Implementation of inspection of thickness of pipelines for power generation Reinforcement of efforts to perform facility based maintenance -It is also very important to improve skills of thermal power operators -Efforts should be made to energetically promote sharing of useful information so that safe and stable operation of the power stations can be continued Final Report

8 Routine Management Condition (1) Confirmation of the current status 1) The power stations of Indonesia Power and PJB have acquired international certifications of ISO 14001(Environment Management System) of Integrated management system, ISO 9001 (Quality Management Systems) and OHSAS (Occupational Health and Safety Management Systems) and the general manager and staff of each power station have been enthusiastically making enormous efforts for the routine operation, maintenance and management. 2) Both Indonesia Power and PJB have been operating power stations since 1995 based on various indices defined by NERC (North America Electric Reliability Council). PJB Headquarters have introduced MOP (Maintenance Optimization Program) and are now implementing the program at Gresik, Paiton and M. Karang. 3) Trips/Shutdowns/Derating, etc. frequently occur at the power stations and the number of forced outages (times/hours) is overwhelmingly large when compared with that experienced by the power stations in Japan. Under such situation, operators of each power station are busy with troubleshooting of the facilities, while maintenance workers are busy with routinely occurring emergency works, scheduled inspection works and large-scale repair works. (2) Implementation status of routine inspection (inspection items, conditions, frequency, etc.) <Operation> Both Indonesia Power and PJB implement routine inspection under organizational systems similar to each other. Contents Shift system 3 shifts by 4 teams (All time monitoring system): 1st Shift: 07:00 ~ 15:00; 2nd Shift: 15:00 ~ 22:00, 3rd Shift: 22:00~07:00 Routine patrol inspection Operation monitoring of Control Room Others Based on Logsheet specifying operation managing values, patrol inspection of Ground Floor, Boiler area, Turbine area, etc. is conducted 2 times/shift and 6 times/day (08:00, 13:00, 16:00, 20:00, 23:00, 05:00). (Note: Almost of IP and PJB power stations takes every hour.) See Logsheet of Suralaya power station of Indonesia Power on APPENDIX TH-1 for inspection items. Output of generators, temperature and pressure of each equipment are recorded and monitored based on Logsheet every 30 minutes (or hour). As for Inspection items, see Logsheet Control Room of Suralaya power station of Indonesia Power on APPENDIX TH-2 for inspection items. At IP and PJB power stations, frequency of inspection is decided based on Log Sheet for all facilities, such as weekly, monthly, quarterly, and biannually. At the time of weekly inspection or monthly inspection, switchover of auxiliary machines such as compressors is conducted. * At some power stations, a unit trip was caused by governor-free test of turbines. Final Report 3-64

9 < Maintenance > Based on Logsheet, weekly inspection or monthly inspection is conducted and scheduled inspection work is also performed by establishing the work schedule. At IP/PJB power stations, Condition-Based Monitoring (of power source, voltage, temperature and pressure) is performed for machinery of less importance (pumps, motors, fans, compressors, etc.). Especially, at PJB, machinery analysis and monitoring by John S. Michell is adopted. Environmental monitoring data (NOX, SOX, P, etc.) are also collected. < Keeping and Management > Logsheet of patrol (results), design library, manuals maker s instructions and test records are kept and managed at each power station s Library. - Inspection through CBM (Condition Based Monitoring) is conducted basically with the exclusively diagnosing tool, but in order to prevent unforeseen facility troubles, it is very important to maintain and manage facilities aiming to expand the definition of CBM. - If there are any facilities, valves, etc. which do not have any description of such equipment, it is important to establish a procedural guideline and display names of equipment from the viewpoint of preventing erroneous operation at the time of operation and maneuvering and performing work. - It is also important to describe standard values and normal ranges for all instruments. - Trips, Shutdowns, Derating, etc. have occurred routinely at each power station. Under such situation, it is necessary to prevent oversight in patrol inspection and review ways to conduct reasonable patrol inspection instead of simply conducting patrol inspection based on Logsheet. (3) Preparation status of manuals and guidelines Based on the questionnaire survey, the Study Team has confirmed that the following manuals and guidelines have been prepared. 1) Guideline for thermal power handling jobs: 1 2 Standard guidelines which are common to operation and maintenance - Guideline for handling of accidents/troubles. - Guideline for handling of work sheet. - Guideline for disposal of industrial waste. Guidelines for operation (including environment and chemicals): - Guideline for Names of thermal power station facilities. - Guideline for management of lubricant oil, etc Final Report

10 - Guideline for procedure for operational power stoppage. - Guideline for water quality control. 2) Guidelines for quality control of scheduled inspections: - Guideline for prior assessment of work safety. - Guideline for preparation of specification. - Guideline for operation management of environment and chemical. 3) Manuals for management of power station operating jobs: - Manual for operator training. - Manual for operation jobs. - Manual for operation ad maneuvering. - Manual for patrol inspection management. - Manual for scheduled tests. - Manual for measurements to be taken in case an alarm is issued. - Manual for managements of valve locking. - Manual for safety and health activities. - Manual for environmental security management. - Manual for patrol inspection standards for maintenance workers. - Manual for security standards for power station facilities. - Manual for handling panel operation. - Manual for scheduled inspection work of measurement and control equipment. - Manual for budget plans and execution management. - The procedural guidelines have not been established for the scheduled inspection at both IP and PJB. (The inspections are conducted in accordance with scheduled inspection manuals proposed by the manufacturers.) - In order to improve quality of the scheduled inspection works and establish reliability of the equipment, it is necessary to prepare Procedural guideline for the implementation of scheduled inspections, Inspection guideline, Inspection procedure and Procedural guideline for welding inspections which are unique to IP and PJB. It is also crucial to attempt preparation and expansion of the manuals for quality and safety assurance. (4) Operation, maintenance, management of material procurement, etc. In order to conduct further operation and maintenance and management of material procurement, PJB employs ELLIPSE a consultant of Australian Mincom, while Indonesia Power employs MAXIMO, American MRO Software. They link the following modules by intra-office LAN to share information. * ELLIPSE is the latest Version of MIMS (Mincom Information management system) Final Report 3-66

11 ELLIPSE (PJB) and MAXIMO (IP) are almost the same modules with each other. 1 Operation and Maintenance Module Equipment Register Work Order (Predictive/Preventive/Corrective Maintenance) Production Statistic Fuel & Oil IP uses own its program for fuel & oil called PRONIA 2 Material Management Module Cataloger Inventory Control Management Warehouse Inventory Tracking Purchase Order In view of the current status that accidents and troubles of facilities occur repetitively because of insufficient repairs due to delay in procuring materials, it is necessary to improve the company-wide material procurement management. 3 Finance Module Journal Ledger COA : charge of Account Journal Holding Fixed Asset Financial Management 4 Labor Costing Module 5 Account Payable Module IP uses ORACLE for account payable 6 Human Resources Module Planning Establishment Training Payroll At the moment IP uses own program for Human Resources System IP is still developing Human Recourses system and use ORACLE 3-67 Final Report

12 (5) Education and training A. Indonesian Power and PJB provide the following education and training to the whole personnel. < Indonesian Power > 1 DIKLAT PENGADAAN 2DIKLAT PEMBINAAN - Recruitment Training Basic Course for Freshmen - Skill / Knowledge up Training Middle Course for some level and / or task staff 3DIKLAT PENGEMBANGAN - Developing Training Advanced Course for promotion or rotation staff 4DIKLAT PELEPASAN 5Certification / New Module (New standard program) - Retirement Training Mental spirit training Enterprise training for pre-retired person - Examination for operators and maintenance staff Module 0-General Module 1-for Auxiliary Equipment Module 2-for Boiler System Equipment Module 3-for Turbine/Generation Equipment Module 4-for Efficiency Operation < PJB > 1 Full Package Education and Training for PLTU, PLTGU, and PLTG -From Basic Course to Full standard for operators and maintenance staff. 2Refreshment Training -Middle Course of rotation staff 3 Certification / New Module (New standard program) -Examination for operators and maintenance staff Module 0-General Module 1-for Auxiliary Equipment Module 2-for Boiler System Equipment Module 3-for Turbine/Generation Equipment Module 4-for Efficiency Operation B. At PLN Suralaya Unit, the following education and training are provided to the operators and maintenance personnel of Indonesia Power and PJB. 1 On-Site Simulator Training for PLTU (Coal-Fired, 400 MW 600 MW) -CRT based PLTU Simulator -Panel based PLTU Simulator Final Report 3-68

13 -Panel based Ancillary PLTU Simulator -Generator operation Simulator etc. 2 Generator unit Operation Training -Boiler & Turbine Operation for PLTU -HRSG & Turbine Operation for PLTU -Logic & Sequence for Operator -Basic Training (Level 1, 2, 3) for PLTU Boiler Operation Turbine Operation -Basic Training (Level 1, 2, 3) for PLTG and PLTGU -Generator Operation Analysis etc. 3Generator unit Maintenance Training -General Maintenance for PLTU -Machine Maintenance for PLTU (Level 2, 3, 4) -Electric Maintenance for PLTU (Level 2, 3, 4) -Instrument and Control Maintenance for PLTU (Level 2, 3, 4) -Balancing & Alignment -Vibration Analysis -3 Phase Electric Motor -Water Treatment etc. C. Other education and training consist of lectures, discussions, etc. which are combined with simulated training and OJT on site. PLN Suralaya Unit has 5 Senior Instructors, out of whom 3 persons are scheduled to retire in They are faced with a great difficulty in selecting the successors. PLN needs to promptly select the successors and it is very important to bring up Instructors. The training simulator is the most effective to improve the skills of operators in the normal starts and stops of the unit and troubleshooting of the unit ; however, since there is no such simulator for PLTU (400 MW and 600 MW coal-fired thermal power), it is necessary to install a simulator for PLTGU. It is necessary to improve the current education of newcomers so that the reliability of the thermal power stations of Indonesia Power and PJB can be enhanced and maintained. It is also very important to prevent lessons gained from accidents, troubles, etc. from fading with time, prevent recurrence of similar accidents and pass on the skills to next generations and tackle these tasks as part of the routine education at Indonesia Power and PJB Division Final Report

14 Status of Maintenance Management (1) Implementation status of scheduled inspections The overall adjustment of specific schedules of the scheduled inspections at power stations in Java-Bali regions is made by P3B. The process and interval of the scheduled inspections are established by each power station based on the recommendations of the equipment manufacturers. The standard inspection periods and intervals and the actual results for the past 3 years from 2003 to 2005 are as shown in Table There are some scheduled inspection works whose periods were extended or in which repair works could not be done during designated work periods due to delay in the procurement of replacements, spare parts, parts, etc. Quality control during scheduled inspection work is conducted jointly by the power station and the maintenance teams (UBHAR/UHAR). However, since replacements of poor quality are used, machinery damage and troubles have frequently occurred once commercial operation is restored. Deterioration of facilities has occurred. There are some equipment which do not always exhibit sufficient function or whose capacities are deficient. As for such defective machineries, orders have already been placed for replacements; however, repairs have not been made due to delay in procuring such replacements. (2) Plans and actual results of the scheduled inspections by unit in 2006 Table shows Scheduled Maintenance and Inspection plans and results of Indonesia Power and PJB. - The insufficient repairs and deterioration of plants due to delay in procuring materials are common to both IP and PJB and urgent improvements are required for the whole company. - It is also important to take measures to reduce scheduled inspection period so that safer inspections and high operation rates can be ensured. - Since damage of equipment due to aging deterioration of power generation facilities is expected to increase, it is very important to review the inspection system at the time of scheduled inspections to prevent oversight of inspections. It is also necessary that improvements be made in the routine maintenance work. Final Report 3-70

15 P/S Suralaya (IP) Tanjung Priok (IP) Muara Karang (PJB) Muara Tawar (PJB) Tambak Lorok (IP) Perak (IP) Grati (IP) Table (1) Scheduled Maintenance / Inspection Standard Type / Interval / Period Records of Scheduled Maintenance/Inspection for 2003, 2004 and 2005 by Unit Type Unit No. Standard Plan Actual Standard Plan Actual Standard Plan Actual Type (days) (days) Type (days) (days) Type (days) (days) 8,000 8,000 8,000 8,000 TU-1 None SI ME ~10,000 (H) ~10,000 (H) ~10,000 (H) ~10,000 (H) TU-2 None SE SI TU-3 ME SI None TU-4 SE SI None 0 Simple Mean Simple Serious TU-5 ME None SI None (28 days) (30 days) (28 days) (60 days) TU-6 SI None TU-7 SI None SE (GT) GT-1.1 B B C ,000 (H) 6,000 (H) 6,000 (H) 6,000 (H) GT-1.1 C GT-1.2 B C B Type A Type B Type A Type C GT-1.3 B 10 8 B B (7 d) (14 d) (7 d) (45 d) GT-1.3 C (ST) ST-1.0 MI None None 8,000 (H) 8,000 (H) 8,000 (H) 8,000 (H) GT-2.1 C B C GT-2.2 B B B Simple Mean Simple Serious GT-2.3 None B C (28 d) (30 d) (28 d) (45 d) ST-2.0 None None None (GT) GT-1.1 MI 45 CI CI ,000 (H) 8,000 (H) 8,000 (H) 8,000 (H) GT-1.2 MI 45 MI CI GT-1.3 MI 45 MI CI CI HGPI CI MI ST-1.0 ME 30 SE 45 - SE (10 d) (30 d) (10 d) (45 d) TU-1 SI 18 None ME (ST) TU-2 ME 40 SE (SE) 8,000 (H) 8,000 (H) 8,000 (H) 8,000 (H) TU-3 SE 45 SE (ME) ME TU-4 SE 45 SI - - ME Simple Mean Simple Serious TU-5 SI 21 ME SE (18 d) (30 d) (18 d) (45 d) - (GT) GT-1.1 Rep. HP 140 B C ,000 (H) 6,000 (H) 6,000 (H) 6,000 (H) GT-1.1 A 7 A 7 12 A 7 21 GT-1.2 B 21 B C Type A Type B Type A Type C GT-1.2 A 7 A 7 40 (MO) A 7 7 (7 d) (14 d) (7 d) (45 d) GT-1.3 A 7 B C 45 - MO: Major Overhaul GT-1.3 Gene. 46 None A 7 7 (ST) ST-1.4 ME 30 SI - - SI - - 8,000 (H) 8,000 (H) 8,000 (H) 8,000 (H) GT-2.1 C 100 C A 7 17 GT-2.1 B Simple Mean Simple Serious GT-2.2 Rep. HP 408 C A 7 19 (21 d) (30 d) (21 d) (45 d) GT-2.2 B 11 (GT) GT-1.1 CI 10 9 HGPI None 6,000 6,000 6,000 6,000 GT-1.2 CI HGPI None GT-1.3 MI CI HGPI CI HGPI CI MI ST-1.0 SI SI SE (7 d) (28 d) (7 d) (50 d) GT-2.1 HGPI CI MI (ST) GT-2.2 HGPI CI MI ,000 8,000 8,000 8,000 GT-2.3 MI HGPI None ~10,000 (H) ~10,000 (H) ~10,000 (H) ~10,000 (H) ST-2.0 SE SI TU-1 SI ME Simple Mean Simple Serious TU-2 ME SI (28 d) (30 d) (28 d) (45 d) TU-3 SI ME (GT) TU-3 SI None ME ,000*CDF (H) 8,000 (H) 8,000 (H) 8,000 (H) TU-4 SE None SI SI(21 d) ME30 d) SI(21 d) SE(45 d) - (GT) GT-1.1 TI None CI ,000*CDF (H) 8,000 (H) 8,000 (H) 8,000 (H) GT-1.2 TI None CI 11 9 GT-1.3 CI TI CI CI(7 d) HGPI(28 d) CI(7 d) MI(45 d) ST-1.0 None TI: Turbine Inspection: HGPI GT-2.1 FYI None TI FYI: First year Inspection GT-2.2 FYI None None (ST) GT-2.3 FYI 14 8 None None 8,000 (H) 8,000 (H) 8,000 (H) 8,000 (H) Simple Mean Simple Serious - (18 d) (30 d) (18 d) (45 d) Final Report

16 + P/S Gresik (PJB) Paiton (PJB) Pesanggaran (IP) Gilimanuk (IP) Pemaron (IP) Table (2) Records of Scheduled Maintenance/Inspection for 2003, 2004 and 2005 by Unit Type Scheduled Maintenance / Inspection Standard Type / Interval / Period Unit No. Standard Plan Actual Standard Plan Actual Standard Plan Actual Type (days) (days) Type (days) (days) Type (days) (days) (GT) GT-1.1 MI 45 CI TI ,000 (H) 8,000 (H) 8,000 (H) 8,000 (H) GT-1.2 TI 25 CI 10 9 MI GT-1.3 TI 25 CI MI CI(10 d) HPGI(30 d) CI(10 d) MI(45 d) ST-1.0 SE 45 SI SE 45 - GT-2.1 TI 25 TI MI TI: Turbine Inspection: HRSG GT-2.1 CI GT-2.2 MI 45 CI 10 9 TI (ST) GT CI ,000 (H) 8,000 (H) 8,000 (H) 8,000 (H) GT-2.3 CI 10 CI MI GT-2.3 TI 25 MI MI None 0 Simple Mean Simple Serious ST-2.0 SE 45 SI 18 - SE 45 - (18 d) (30 d) (18 d) (45 d) GT-3.1 CI 10 TI CI GT-3.2 CI+Co. 30 MI CI 10 8 GT-3.3 CI+Co. 30 MI CI ST-3.0 ME 30 ME SI TU-1 SI 16 SE 45 - SE TU-2 ME 30 ME SI TU-3 SI 18 ME SE+Granti TU-4 ME 30 SI SE+Granti GT-1 CI HGPI GT HGPI (ST) TU-1 ME 42 ME SI ,000 (H) 8,000 (H) 8,000 (H) 8,000 (H) TU-1 None SE TU-2 SE 57 SI ME 42-0 Simple (26 d) Mean (42 d) Simple (26 d) Serious (57 d) - (GT: Alstom; GT-1, GE; GT-2) GT-1 MI HGPI CI 9 5 4,000 (H) 4,000 (H) 4,000 (H) 4,000 (H) GT-1 CI 9 9 GT-2 CI 9 4 CI 9 6 MI CI(7 d) HGPI(28 d) CI(7 d) MI(45 d) GT-2 HGPI (GT: WH; GT-3,4) GT-3 HGPI CI 9 6 None 6,000 (H) 6,000 (H) 6,000 (H) 6,000 (H) GT-3 GT-4 CI HGPI None 0 CI(7 d) HGPI(28 d) CI(7 d) MI(45 d) GT-4 CI 9 9 (GT) GT-1 A 15 9 A 9 10 B ,000 (H) 6,000 (H) 6,000 (H) 6,000 (H) GT-1 C None A 7 7 GT-1 C Type A (7 d) Type B (14 d) Type A (7 d) Type C(45 d) - (GT) GT-1 None None CI ,000 (H) 4,000 (H) 4,000 (H) 4,000 (H) GT-2 None None None - 0 CI (7 d) HGPI (28 d) CI (7 d) MI(45 d) - Final Report 3-72

17 Table Plans/Actual of Scheduled Maintenance/Inspection for 2006 by Unit Type (As of July 2006) < Indonesia Power > Power Station Suralaya Tanjung Priok Perak Grati unit unit Standard Plan Actual Power Station Standard Plan Actual No. No. Type (days) (days) Type (days) (days) Tu-1 None GT-1.1 MI Tu-2 None GT-1.2 HGPI Tu-3 ME GT-1.3 None Tu-4 ME ST-1.0 SI 21 Tu-5 SE GT-2.1 CI 8 5 Tu-6 ME 30 Tambak Lorok GT-2.2 MI Tu-7 SI+ 30 GT-2.3 MI 51 In progress GT-1.1 B ST-2.0 SE 51 GT-1.2 B Tu-1 SI 28 GT-1.2 C 45 Tu-2 SE 51 GT-1.3 B Tu-3 SI+ 76 ST-1.0 None Gilimanuk GT-1 A 9 9 GT-2.1 B 14 9 GT-1 B 14 GT-2.2 C 45 Pemaron GT-1 CI GT-2.3 B 14 GT-2 MI ST-2.0 MI 42 GT-2 CI 14 Tu-3 SI+Re 60 Pesanggaran GT-1 None Tu-4 ME+Reh 60 GT-2 CI 14 6 GT-1.1 None GT-3 MI GT-1.2 MI GT-4 MI GT-1.3 MI 41 ST-1.0 MI GT-2.1 None GT-2.2 TI GT-2.3 TI < PJB > Power Station Muara Karang Muara Tawar Paiton unit unit Standard Plan Actual Power Station Standard Plan Actual No. No. Type (days) (days) Type (days) (days) Tu-1 SE 60 Tu-1 SI Tu-2 ME 45 In progress Tu-2 SE 45 In progress Tu-3 SE Tu-3 SE+Grant Tu-4 SE 60 Tu-3 SI 18 Tu-5 ME Tu-4 SI 18 Tu-5 SE 60 GT-1 None GT-1.1 HGPI 30 GT-2 CI GT-1.2 CI 14 GT-1.1 CI 10 9 GT-1.3 CI 14 GT-1.1 MI+RI 45 ST-1.0 SI 18 GT-1.2 CI GT-1.1 B Gresik GT-1.2 TI 25 GT-1.1 A 8 GT-1.3 CI 10 GT-1.2 B ST-1.0 SE 45 GT-1.2 A 8 GT-2.1 CI GT-1.3 C GT-2.2 MI+RI 45 GT-1.3 A 8 8 GT-2.3 MI+RI GT-1.3 B 21 ST-2.0 SE ST-1.4 SE GT-3.1 MI GT-2.1 A 8 9 GT-3.2 TI GT-2.1 C 45 GT-3.3 TI GT-2.2 A 8 9 GT-3.0 SE 45 GT-2.2 C 45 Tu-1 None Tu-2 SE Sources : INDONESIA POWER & PJB data 3-73 Final Report

18 (3) Management of work plans Indonesia Power and PJB confirm the status of the Preventive/Predictive/Corrective Maintenance and the new work plans, taking into account the 5-year midterm work plans and load balance by the internal meetings as listed below. Items Internal Meetings at Power Station Main Agenda 1 - Yearly Meeting (Develop 5 year Plan by Unit) - Planned Outage Scheduling Rehabilitation, Major Modification, Re-powering, and Scheduled Inspection Plan etc. 2 - Quarterly Meeting (Develop Plan of the year) - Yearly Preventive Maintenance & Predictive Maintenance & Load Balancing - Yearly Maintenance Budget 3 - Monthly Meeting (Develop Plan of the Quarter) - Detail Planning & Scheduling of individual Outages - First Line Maintenance work orders Load Balancing - Monthly Schedule & Load Balancing - For coal 4 - Weekly Meeting (Develop Plan of the Week) - Work outside Outages - not urgent(required after 7 days) Preventive Maintenance Corrective Maintenance 5 - Daily Meeting (Develop Plan of the Day) - Work outside Outages - urgent (required in less than 7 days) Preventive Maintenance Corrective Maintenance It is essential to collect and put together actual data of accidents and have discussions at such Internal Meetings in an effort to solve pending items in terms of the facilities and operations of the power stations so that appropriate troubleshooting can also be carried out. (4) Information sharing among power stations As shown in Table below, efforts have been made by the power stations of Indonesia Power and PJB to share information on the operation and maintenance of such power stations. Final Report 3-74

19 Information Exchange Meetings among the power stations Items PJB Indonesia power 1 Coordination Meeting Attendance Frequency Main Agenda -Deputy Manager -Every 3 months -Performance Report -Condition of power station -GM or DGM - ditto - - ditto - 2 Operation & Maintenance Meeting Attendance Frequency Main Agenda None Internal Meeting =Daily meeting -GM or DGM -Every 2 months -Information Exchange 3 Technical Forum Attendance Frequency Main Agenda -DM & Supervisor -Every 6 months -Problem & Solution -Manager -Every year -ditto- 4 Working Group Meeting New Information Sharing Meeting Attendance Frequency Main Agenda -Start from Specialist -Every 6 months -Good Practice Information Sharing None Internal Meeting =Weekly meeting It is very important to have Information Exchange Meetings regularly on such information as is useful for safe and stable operation of the power stations, namely, information on tasks for all management and personnel such as 1) measures to prevent critical disasters and 2) measures to prevent accidents affecting power supply so that overall spiraling improvement of performance can be achieved Operation and Maintenance Management System (1) Organizations of Indonesia Power and PJB Power Stations A typical organizational chart of a power station of Indonesia Power and PJB is as shown below Final Report

20 Organization Chart of an Indonesia Power Station GENERAL MANAGER AUDITOR SPESIALIS OPERASI DAN NIAGA PEMELIHARAAN ENJINIRING MANAJER LOGISTIK SISTEM DAN SDM KEUANGAN HUMA Organization Chart of a PJB PowerStation Source : INDONESIA POWER data (T.PRIOK) MANAGER AUDITOR ENJINIRING OPERASI PEMELIHARAAN KIMIA DAN LK 3 KEUANGAN SUMBERDAYA MANUSIA UMUM Source : PJB data (M. KARANG) The organizations of Indonesia Power and PJB which are engaged in operation and maintenance management of the power stations are of the same structure with each other. (2) Routine Maintenance Management System of Power Stations As shown in Table 3.2-8, Indonesian Power has established Maintenance System based on Location of Facilities while PJB has established Maintenance System based on Category of Maintenance Method. Therefore, Indonesia Power and PJB conduct maintenance management under the systems which are different from each other. < Measures to cope with troubles due to deterioration of aging facilities > Since unpredictable troubles due to aged deterioration of power generation facilities are expected to increase in the future, it is essential for both Indonesia Power and PJB to consider reviewing the methods to tackle routine facility maintenance from the viewpoint of maintaining reliability of the facilities. For instance, measures to reinforce facility based maintenance are as follows: 1 Inspection activities focusing on investigation of deterioration status of the whole facilities 2 Visual inspection by maintenance personnel who are familiar with their own facilities 3 Study on the employment of new exclusive diagnosing tools as preventive measures against deterioration of facilities Final Report 3-76

21 Indonesia Power (IP) Table System for Maintenance Division at Power Station Duty Main Task (Deputy General Manager) Manager Machine Maintenance Turbine Maintenance Supervisor Senior Boiler Maintenance Control Maintenance Supervisor Electric Maintenance Pump & Compr. Maintenance Technician Senior Fan & Mill Maintenance etc. Technician Senior ( ):Only Suralaya Maintenance System Based on Location of Facilities PJB Deputy Manager Specialist Supervisor Technician Senior Technician Junior Corrective & Emergency Maintenance Predictive Maintenance Preventive Maintenance Maintenance System Based on Category of Maintenance Method IP adopts Maintenance System Based on Location of Facilities, while PJB adopts Maintenance System Based on Category of Maintenance Method. IP is recommended to strengthen their maintenance system and PJB is recommended to switch their maintenance system to the Maintenance System Based on Location of Facilities because it is envisaged the aged deterioration of power facilities is accelerating in the future. (3) Sharing of roles between Power Station and Maintenance Business Unit (UBHAR/UHAR) for Scheduled Maintenance As shown in Table and Table , there are differences between Indonesia Power and PJB in the details of assistance provided by the Maintenance Business Unit (UBHAR/UHAR) in Scheduled Inspection Work and Scheduled Special Order Maintenance Work. Indonesia Power s UBHAR/UHAR : Main facilities such as boilers, turbines, generators, etc. PJB s UBHAR/UHAR : All facilities such as main turbines, auxiliary machinery and commonly used facilities Final Report

22 < Review of Quality Control System for Scheduled Inspection Work > While the Quality Control of the Scheduled Inspection Work is performed jointly by Maintenance Division (UBHAR/UHAR), in view of the current status in which troubles due to inappropriate maintenance have frequently occurred and the increase of unexpected troubles due to aged deterioration of the power station facilities, it is recommended that Quality Control System be established with the user s power station taking a leadership role. Table Sharing of Role between Maintenance Department of the Power Station and Maintenance Business Unit (UBHAR/UHAR) Category of Maintenance 1. Corrective Maintenance & Emergency work for PLTU, PLTGU and PLTG e.g. 1 Unscheduled maintenance work (Fire accident or Trouble) 2 Maintenance work against malfunctions of facilities in operating division 2. Predictive Maintenance for PLTU, PLTGU and PLTG e.g. 1 Condition-based maintenance should be carried out on the low priority facilities Pump/Motor/Fan/Compressor, etc. 3. Preventive Maintenance for PLTU, PLTGU and PLTG e.g. 1 Daily maintenance work 2 Planning maintenance 3 Scheduled inspection work 4 Scheduled special order maintenance work :Responsible Task Indonesia Power PJB Power Station UBHAR Power Station UBHAR Major Accident or Trouble Major Accident or Trouble Auxiliary Ancillary Quality control Unit start-up Main Facility Quality control Quality control Unit start-up Main Facility Auxiliary Ancillary Quality control Remarks; UBHAR ; Maintenance Business Unit In Scheduled Inspection Work, UBHAR/UHAR of IP are in charge of the main facilities and UBHAR/UHAR of PJB are in charge of all the facilities including main turbines, auxiliary machinery and commonly used facilities. Final Report 3-78

23 Table Support System in UBHAR for Scheduled Maintenance/Inspection Work < Indonesia Power > - UBHAR Head-office in Jakarta city carries out two services as follows UBHAR Internal Service for Indonesian Power s Power station External Service for another IPP/companies -UBHAR Teams are dispatched to 5 units to support maintenance areas of each thermal power station in JAVA-BALI Region Suralaya Area,T. Priok Area,Perak-Grati Area and Bali Area, Semarang Area -Each UBHAR Area Team carries out coordinating Scheduled Inspection works and Special Order Maintenance works -UBHAR Head-office dispatches 1 or 2 persons (Expert persons) in order to support Quality Control for UBHAR Area Team during Scheduled Inspection work which are Serious (Major), Mean and Simple Inspection <PJB> - UBHAR Head-office at Gresik carries out the internal service only for PJB s power station - Every thermal power station in PJB has unit support maintenance as subordinate of UBHAR They works for Scheduled Inspection Work and Special Order Maintenance Work - UBHAR Head-office dispatches 2 persons (Specialist, Supervisor) in order to support Quality Control of UBHAR at power station during Scheduled Inspection works which are Serious (Major), Mean and Simple Inspection (4) Status of regular personnel interchanges between operators and maintenance personnel It appears that once the assignments of newcomers are fixed, their jobs are rarely changed. There have been few cases of regular personnel interchanges. It is very important to regularly effect personnel changes between operators and maintenance staff so that improvement of the overall skills can be achieved. From the viewpoint of improving skills of the maintenance personnel of the power stations, personnel changes with the Maintenance Business personnel should be effected at regular intervals Final Report

24 Table (1) Summary of Forced Outage for 2003, 2004 and 2005 at Each Unit Type PLTU Unit Suralaya P/S Paiton P/S Muara Karang P/S Gresik P/S Tambak Lorok P/S Perak P/S Base Load Unit Base Load Unit Base Load Unit Base Load Unit Base Load Unit Base Load Unit Coal Fired Coal Fired MFO/HSD/NG Fired MFO/NG Fired MFO Fired MFO Fired Total 4x400MW + 3x600MW 2 x 400 MW 3x100MW + 2x200MW 2x100MW + 2x200MW 2x50MW + 1x200MW 2 x 50MW Trouble Items Times (%) Hours Times (%) Hours Times (%) Hours Times (%) Hours Times (%) Hours Times (%) Hours Times (%) Hours 1 Instrumentation and Control 42 (9.2) (38.7) (45.6) 1, (41.7) (37.0) (14.7) (40.4) 2, Turbine / Generator 14 (11.5) (25.8) (20.4) 1, (25.0) (17.4) (38.2) (20.3) 3, Boiler and Auxiliaries 34 (75.3) 1, (35.5) (19.8) 1, (30.4) (47.1) 6, (27.5) 11, Cable/Relay Trouble 3 (1.9) (33.3) (13.0) (3.3) Inverter Trouble 2 (1.2) (0.5) Transformer Trouble 2 (1.2) (0.5) System Fault or Irregular Frequency 10 (3.1) (3.1) (2.2) (4.1) Others 2 (0.9) (6.8) (3.3) Total 102 (100) 2, (100) (100) 5, (100) (100) 1, (100) 7, (100) 17, (Reference Attachment Sheets) - Summary of Forced Outage for 2003, 2004 and 2005 (~ Nov.) at Paiton and Suralaya P/S Remarks - Summary of Forced Outage for 2003, 2004 and 2005 (~ Dec.) at Muara Karang P/S - Summary of Forced Outage for 2003, 2004 and 2005 (~ Oct.) at Gresik P/S - Summary of Forced Outage for 2003, 2004 and 2005 (~ Oct.) at Tambak Lorok P/S - Summary of Forced Outage for 2003, 2004 and 2005 (~ May) at Perak P/S Source : Indonesia Power, PJB data Final Report 3-80

25 Table (2) Summary of Forced Outage for 2003, 2004 and 2005 at Each Unit Type PLTG Unit Muara Tawar P/S Grati P/S Pesanggaran P/S Gilimanuk P/S Pemaran P/S Peak Load Unit Peak Load Unit Peak Load Unit Base Load Unit Peak Load Unit HSD Fired HSD Fired HSD Fired HSD Fired HSD Fired 2 x 140 GT 3 x 100.8GT 1x x20 + 2x42 1 x 133.8GT 2 x 48.8GT Trouble Items Times (%) Hours Times (%) Hours Times (%) Hours Times (%) Hours Times (%) Hours Times (%) Hours 1 Instrumentation and Control 21 (48.8) (70.9) (11.4) (20.0) (52.4) (50.0) 1, Total 2 Turbine / Generator 15 (34.9) (22.8) (68.6) (40.0) (33.3) (36.2) 1, Cable / Relay Trouble 2 (5.7) (20.0) (14.3) (3.7) Electrical Fault 5 (6.3) (2.7) System Fault or Irregular Frequency 1 (2.3) (11.4) (20.0) (3.7) Derating 6 (14.0) (3.2) Others 1 (2.9) (0.5) 8.02 Total 43 (100) 1, (100) 1, (100) (100) (100) (100) 2, (Reference Attachment Sheets) - Summary of Forced Outage for 2004 and 2005 (~ Oct.) at Muara Tawar P/S Remarks - Summary of Forced Outage for 2003, 2004 and 2005 (~ Dec.) at Grati P/S - Summary of Forced Outage for 2003, 2004 and 2005 (~ Oct.) at Pesanggaran P/S, Gilimanuk P/S and Pemaran P/S Source : Indonesia Power, PJB data 3-81 Final Report

26 Table (3) Summary of Forced Outage for 2003, 2004 and 2005 at Each Unit Type PLTGU Unit Tanjung Priok P/S Gresik P/S Muara Karang P/S Peak Load Unit Peak Load Unit Peak Load Unit HSD/NG Fired HSD/NG Fired NG Fired 3x130GT + 1x200ST 3x130GT + 1x200ST 3x112.5GT + 1x188.9ST 3x112.5GT + 1x188.9ST 3x112.5GT + 1x188.9ST 3x107.8GT + 1x185ST Trouble Items Times (%) Hours Times (%) Hours Times (%) Hours Times (%) Hours Times (%) Hours Times (%) Hours 1 Instrumentation and Control 25 (45.5) (21.6) (30.6) (19.0) (37.5) (50.9) Turbine / Generator 15 (27.3) (52.9) (10.2) (12.7) (5.3) (22.3) 1, HRSG and Auxiliaries 19 (38.8) (47.6) (30.4) (2.7) Relay Trouble 12 (10.7) kV Bus Trouble 5 (10.2) (1.6) (3.6) UPS System Trouble 1 (2.0) (3.2) Electrical Trouble 8 System Fault or Irregular Frequency 13 (23.6) (25.5) (8.2) (14.3) (17.9) (8.9) Derating 10 Others 2 (3.6) (1.6) (5.3) (4.5) Total 55 (100) (100) (100) (100) (100) (100) 2, (Reference Attachment Sheets) - Summary of Forced Outage for 2004 and 2005 (~ Sep.) at Tanjung Priok P/S Remarks - Summary of Forced Outage for 2003, 2004 and 2005 (~ Dec.) at Gresik P/S - Summary of Forced Outage for 2003, 2004 and 2005 (~ Dec.) at Muara Karang P/S Source : Indonesia Power, PJB data Final Report 3-82