1. PRESENT CONDITIONS

2. FREQUENCY DURATION CURVE 2002-03, 2003-04, 2004-05 & 2005-06 <49.0 49.0 & <50.5 50.5 & Above MaxMinAvgFVI 2005-062.7697.2.0450.7648.4249.642.25 2004-050.1398.700.1750.9048.6249.850.83 2003-042.3097.300.4451.1748.1849.691.95 2002-0349.4848.512.0151.3747.6948.9518.86

3. FREQUENCY SPECTRUM OF SOUTHERN REGION FOR PAST SIX YEARS

5. VOLTAGE PROFILE OF SOUTHERN REGION FOR PAST SIX YEARS

6. ISSUE: In general it can be seen that SR grid is shifting from low frequency/ low voltage to high frequency/high voltage regime.

7. HIGH VOLTAGE CONDITIONS HIGH FREQUENCY

8. HIGH VOLTAGE CONDITIONS IN SOUTHERN REGIONAL GRID

9. VARIATION OF MAXIMUM VOLTAGES IN SR GRID DURING NOV 2005

10. Issues Of Concern – High Voltage Frequent switching in/out of Lines –Resulting wear and tear of equipments Continuous High Voltage –Resulting damage to the equipments Network Redundancy is lost with opening of EHV lines –causing Security concerns Opening of EHV lines causes increase in system losses –Commercial losses

11. Actions Taken TAKING OUT THE LINE AND CONVERTING LINE REACTOR TO BUS REACTOR MVAR ABSORPTION BY GENERATING UNITS TRANSFORMER TAP CHANGES MANY ICT TAPS WERE CHANGED ON 400/220 ICT’s GT TAP CHANGES OPENING UP OF LIGHTLY LOADED REDUNDANT TIE LINES UTILISATION OF HYBRID AC/DC NETWORK DIVERSION OF TALCHER STAGE 2 POWER THROUGH GAJUWAKA

12. Desired Actions ABSORPTION OF VARS BY ALL THE OPERATING UNITS WITHIN THEIR CAPABILITY CURVES OPENING OF 220 KV AND BELOW LEVEL LIGHTLY LOADED LINES IN SATES GENERATORS ON SYNCH CONDENSOR MODE TO CARRY OUT DETAILED STUDIES TO FIND OUT REQUIREMENT OF ADDITIONAL REACTORS AT SUITABLE LOCATIONS

13. HIGH FREQUENCY CONDITIONS IN SOUTHERN REGIONAL GRID

14. FREQUENCY PROFILE DURING THE MONTHS SEPTEMBER, OCTOBER, NOVEMBER 2005 Cont..

15. Issues Of Concern – High Frequency Wastage of Resources Grid Insecurity High Frequency also Causes High Voltage Damage to the Equipments Cont..

16. ACTIONS TAKEN TO ARREST HIGH FREQUENCY: Reservoir based hydro backing/closing Liquid Fuel Stations backing/closing down Inter Regional Export under UI Thermal Stations backing/Closing down Exports under Short Term Open Access (STOA ) Cont.. Details

17. TARIFF RELATED SOLUTION: RATIONALISATION OF UI PRICE CURVE SLOPES

19. THIS UI CURVE WAS IN EFFECT FROM 01JAN 03 TO 31 MAR 04 THIS UI CURVE WAS IN EFFECT FROM 01 APR 04 TO 30 SEP 04

20. UNITS WITH A VARIBLE COST OF 90 PAISE WOULD NOT REDUCE TILL FREQUENCY RISES ABOVE 50.2 HZ UNITS WITH A VARIBLE COST OF 90 PAISE WOULD NOW HAVE TO REDUCE AT 50.00HZ ITSELF UI_PRICE Vs FREQUENCY:- THE EFFECT OF PRICE VECTOR ON GENERATION 0 30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480 510 540 570 600 48.5048.6048.7048.8048.9049.0049.1049.2049.3049.4049.5049.6049.7049.8049.9050.0050.1050.2050.3050.40 50.5050.6050.7050.8050.9051.0051.10 FREQUENCY IN HZ UI PRICE IN PAISA/UNIT IN SR 16000MW OF THERMALS OUT OF 18300 MW (87%) HAS VARIABLE COST THAT FALLS IN THE RANGE OF 60PAISE TO 300 paise UI CURVE IN FORCE SINCE 01 OCT 04 SHOW TABLE HIDE TABLE HIDE GRAPH SHOW GRAPH KNEE POINT CHANGED FROM 49.8 TO 50 HZ SLOPE OF HIGH FREQUENCY BAND CHANGED FROM 30ps/0.1 HZ TO 18ps/0.1 HZ SHOW CHANGES

21. Tariff Related Solution Furthur Rationlisation of UI curve to address low frequency of operation the Proposed UI Curve and the details are as follows:

22. SHOW TABLE HIDE TABLE

23. Breakup of STOA and UI in the Total Energy in SR 2004 – 05 2005 – 06 All figures in MUs

24. Breakup of Export, Import and Wheeling in the STOA in SR 2004 – 05 2005 – 06 All figures in MUs

25. Constituent-wise STOA Import/Export Energy 2004 – 05 All figures in MUs 2005 – 06

26. Month-wise Export/Import/Wheeling through STOA 2004 – 05 All figures in MUs 2005 – 06

29. Back

30. STOA CASE - 1 WBSEB to AJMER (Rajasthan) 20 MW for 27 days from 0000 to 1700 hrs. and 2300 to 2400 hrs.

31. WBSEB - AJMER WHEEL THROUGH SR (0000 HRS – 1700 HRS AND 2300-2400 HRS ) 20 MW FROM 05.01.05 to 31.01.05 INJECTING UTILITY WBSEB CUSTOMER: NVVNL DRAWEE UTILITY AJMER ( DISCOM ) INTERVENING REGION SR & WR CAPACITY APPROVED 20 MW DAILY PERIOD 0000-1700 & 2300-2400 hrs DATE OF COMMENCEMENT 05-01-05 DATE OF EXPIRY 31-01-05… INTERVENING REGIONAL LINK ER-SR SR-WR WR-NR WB SR HVDC BACK TO BACK AT GAZUWAKA IN SR ER NR WR RAJASTHAN AJMER HVDC BACK TO BACK AT BHADRWATHI IN WR HVDC BACK TO BACK AT VINDHYACHAL IN WR TRADER: NVVNL INTERVENING STATE TRANSMISSION UTILITYRRVPN

32. WBSEB - AJMER WHEEL THROUGH SR (0000 HRS – 1700 HRS AND 2300-2400 HRS ) 20 MW FROM 05.01.05 to 31.01.05 EXPORT AT WB20 MW AT ER-SR PERIPHERY 19.4 MW AJMER RECIEVES 17.1 MW LOSSES IN ER 3% LOSSES IN SR 3.12% TOTAL LOSSES FOR TRANSACTION 2.9 MW… WB SR HVDC BACK TO BACK AT GAZUWAKA IN SR ER NR WR RAJASTHAN AJMER HVDC BACK TO BACK AT BHADRWATHI IN WR AT SR-WR PERIPHERY 18.8 MW AT WR-NR PERIPHERY 18.1 MW AT NR-RAJ.PERIPHERY 17.6 MW LOSSES IN WR 4% LOSSES IN NR 3% LOSSES IN RAJASTHAN 3% HVDC BACK TO BACK AT VINDHYACHAL IN WR

33. WBSEB - AJMER WHEEL THROUGH SR (0000 HRS – 1700 HRS AND 2300-2400 HRS ) 20 MW AT INJECTION POINT FROM 05.01.05 to 31.01.05 APPLICATION PROCESSING FEE Rs 5000 PER TRANSACTION TRANSMISSION CHARGES PER MW PER DAY 1.Rs 313.93FOR CTU-ER 2.Rs 1462.44FOR ER-SR LINK 3.Rs 700.91FOR CTU-SR 4.Rs 881.49FOR SR-WR LINK 5.Rs 339.98FOR CTU-WR 6.Rs 233.92FOR WR-NR LINK 7.Rs 649.86 FOR CTU-NR 8.Rs 686.3 FOR RAJASTHAN TOTAL TRANSMISSION CHARGE PER UNIT34.15Ps/…. SCHEDULING CHARGES PER DAY 1.Rs 3000FOR ERLDC 2.Rs 3000FOR SRLDC 3.Rs 3000FOR WRLDC 4.Rs 3000FOR NRLDC 5.Rs 3000FOR RAJASTHAN WB SR HVDC BACK TO BACK AT GAZUWAKA IN SR ER NR WR RAJASTHAN AJMER HVDC BACK TO BACK AT BHADRWATHI IN WR HVDC BACK TO BACK AT VINDHYACHAL IN WR MORE DETAILS NEW

34. STOA CASE - 2 APTRANSCO to MPSEB 200 MW for 24 days from 0000 to 0500 hrs. and 2300 to 2400 hrs.

35. APTRANSCO - MPSEB THROUGH NVVNL (0000 HRS – 0500 HRS and 2300 HRS – 2400 HRS ) 200 MW AT INJECTION POINT for 24 days i.e 08.01.05 to 31.01.05 INJECTING UTILITY APTRANSCO CUSTOMER: NVVNL DRAWEE UTILITY MPSEB CAPACITY APPROVED 200 MW DAILY PERIOD 0000-0500& 2300-2400 HRS DATE OF COMMENCEMENT 08-01-05 DATE OF EXPIRY 31-01-05… AP WR GRID MP HVDC BACK TO BACK AT BHADRWATHI IN WR INTERVENING REGIONAL LINK 1.SR-WR TRADER: NVVNL

36. APTRANSCO - MPSEB THROUGH NVVNL (0000 HRS – 0500 HRS and 2300 HRS – 2400 HRS ) 200 MW AT INJECTION POINT for 24 days i.e 08.01.05 to 31.01.05 EXPORT AT AP 200 MW AT SR PERIPHERY 193.8 MW MP RECIEVES 186.1 MW LOSSES IN SR 3.12% LOSSES IN WR 4% TOTAL LOSSES FOR TRANSACTION 13.9 MW… AP WR GRID MP HVDC BACK TO BACK AT BHADRWATHI IN WR CTU

37. APTRANSCO - MPSEB THROUGH NVVNL (0000 HRS – 0500 HRS and 2300 HRS – 2400 HRS ) 200 MW AT INJECTION POINT for 24 days i.e 08.01.05 to 31.01.05 APPLICATION PROCESSING FEE Rs 5000 PER TRANSACTION MORE DETAILS TRANSMISSION CHARGES PER MW PER DAY 1.Rs 700.91FOR CTU-SR 2.Rs 881.49FOR SR-WR LINK 3.Rs 339.98FOR CTU-WR TOTAL TRANSMISSION CHARGE PER UNIT 33Ps /. SCHEDULING CHARGES PER DAY 1.Rs 3000FOR SRLDC 2.Rs 3000FOR WRLDC AP WR GRID MP HVDC BACK TO BACK AT BHADRWATHI IN WR NEW

38. Sl.NoTransactionDurationPs/unit (Old) Ps/unit (New) 1WBSEB-AJMER18 HRS.34.1547.25 2APTRANSCO- MPSEB 6 HRS.33.2123.88 SUMMARY OF TRANSACTIONS WITH OLD AND NEW RATES

39. 220 KV CHIKKODI – KOLHAPUR D/CLINE PONDA (Goa) KOLHAPUR (MAHARASHTRA) CHIKKODI KARNATAKA BELGAUM NARENDRA 220 KADRA KAIGA AMBEWADI XELDEM(GOA) NAGJHARI KODASALLI HUBLI GUTTUR M.L.PURA NOT TO SCALE DISTANCES EXAGERATED FOR CONVENIENCE MAPUSA 220 KV CIRCUIT 1 400 KV CIRCUIT 2

40. STOA Charges Analysis/Comparision DETAILS Back

41. CALCULATION FOR THE SHORT TERM CUSTOMER FOR THE TRANSACTION OF APTRANSCO – MPSEB OF NVVNL (200 MW) BACK

42. CALCULATION FOR THE SHORT TERM CUSTOMER FOR THE TRANSACTION OF WBSEB – AJMER(RAJASTHAN) (20 MW) BACK

43. CALCULATION FOR THE SHORT TERM CUSTOMER FOR THE TRANSACTION OF APTRANSCO – MPSEB OF NVVNL (200 MW) BACK

44. CALCULATION FOR THE SHORT TERM CUSTOMER FOR THE TRANSACTION OF WBSEB – AJMER(RAJASTHAN) (20 MW) BACK

45. MERIT ORDER : UNITS BOXED UP POWER STATIONSTATE CAPACITY(MW) FUEL VARIABLE COST TATA DIESELKARNATAKA 79 DIESEL390 RAYALSEEMA DGPPKARNATAKA 27 DIESEL390 YELEHANKA DIESELKARNATAKA 128 DIESEL600 THANRBHAVIKARNATAKA 220 NAPTHA500 SUB-TOTAL 454 BRAHAMPURAM DPPKERALA 107 DIESEL470 BSESKERALA 157 NAPTHA560 KASARGODE PCLKERALA 22 NAPTHA470 KAYAMKULAMKERALA 360 NAPTHA580 SUB-TOTAL 646 BASIN BRIDGETAMIL NADU 120 NAPTHA863 P.P.NALLURTAMIL NADU 330 NAPTHA550 SUB-TOTAL 450 TOTAL 1550 Back

48. INTER-REGIONAL IMPORTS (During the week 21 st -27 th March, 05)

49. INTER-REGIONAL IMPORTS (During the week 21 st -27 th March, 05)

50. INTER-REGIONAL IMPORTS (During the week 21 st -27 th March, 05)

51. INTER-REGIONAL IMPORTS (During the week 21 st -27 th March, 05)

52. NET GAIN TO SR CONSTITUENTS 21/03/05 TO 27/03/05 DATEER UI RS LAKHS WR UI RS LAKHS TOTAL RS LAKHS 21/03/052.0919.3321.41 22/03/050.516.8517.35 23/03/0515.7323.0038.73 24/03/0514.4948.7563.23 25/03/0514.5451.9666.51 26/03/056.939.1946.09 27/03/054.736.5111.24 TOTAL58.96205.58264.55 AVERAGE/DAY 8.4229.3737.79 AVERAGE TILL NOW 45.6410.19 Back

53. OPPORTUNISTIC UI TRADE POWER EXPORT TO WR ON UI BASIS FREQ Back

54. Constituent-wise STOA Import/Export Energy 2004 – 05 All figures in MUs 2005 – 06 Back

55. FREQUENCY CURVE FOR 24 th NOV 2005 FVI = 1.26 Avg Freq = 50.22Hz Back

56. KADAMPARAI GENERATION/PUMP ENERGY FROM JAN - 2003 2003200420052006 GENERATOR MODE PUMP MODE GENERATOR MODE PUMP MODE GENERATOR MODE PUMP MODE GENERATOR MODE PUMP MODE JAN39384458007293 FEB394621 00 MAR325161800 APR3540263503 MAY374341483046 JUN294555354551 JUL474950497962 AUG5455 415025 SEP364830254115 OCT2615004745 NOV2324006459 DEC495300 7063 TOTAL4465073283304263697293