POWER GRID CORPORATION OF INDIA LTD SOUTHERN REGIONAL LOAD DESPATCH CENTRE in 3rd SRPC MEETING 19 th February 2007 Bangalore GRID EVENTS AND ISSUES

POWER SUPPLY POSITION FOR THE PERIOD FROM OCT 06 TO FEB 07 MAXIMUM DEMAND MET: STATE WISE MAXIMUM DEMAND MET: MWMUs CURRENT YEAR 23, LAST YEAR 23, AGENCY Current Year (MW) Last Year (MW) Current Year (MUs) Last Year (MUs) ANDHRA PRADESH 8,1588, KARNATAKA 5,7585, KERALA 2,6692, TAMIL NADU 8,3197,

FREQUENCY SPECTRUM FROM OCT 06 TO FEB 07 (UPTO 12 TH FEB 07) < 49.0 HZ< 49.5 HZ< 50.0 HZ HZ>50.0HZ>50.2HZ>50.5 HZ Oct Nov Dec Jan Feb-07 (upto 12 th )

Date: 17th October 2006 PRESS RELEASE CERC directs PowerGrid to ensure grid stability 1. In order to take action for violating the Indian Electricity Grid Code (IEGC) by drawing electricity in excess of their schedule drawal, the Central Electricity Regulatory Commission (CERC) has directed PowerGrid to furnish the list of States and their quantum of overdrawals in the time-blocks when the frequency in the extended Central Grid was below 49.0 Hz during the period 9th to 15 th October The Commission has further directed all the RLDCs to keep a strict watch over the Grid Code violations, which can possibly endanger the grid stability and promptly inform the Commission about the defaulters with appropriate recommendation regarding remedial action. 3. The maintenance of satisfactory grid frequency has assumed added importance after synchronization of Northern Regional Grid with Central Grid comprising Western, Eastern and North-Eastern Regional Grids. In this context, the IEGC requires that the various beneficiary States shall always endeavor to restrict their net drawal from the grid to their respective drawal schedules, whenever the system frequency is below 49.5 Hz and when the frequency falls below 49.0 Hz, the requisite load shedding shall be carried out by the concerned State to curtail its over drawal. S. K. Chatterjee Assistant Secretary

STATE OVER <49.0 & 49.5HZ FOR OCT & DEC 2006 STATE No of Blocks O/D Mus < 49.0Hz AVG MW No of Blocks O/D Mus < 49.5Hz AVG MW AP KAR KER TN PONDY GOA

326(31%) TIME BLOCKS FREQ WAS BELOW 49Hz 1014(96%) TIME BLOCKS FREQ WAS BELOW 49.5 Hz State No.of time blocks in which state overdrew MWH Overdrawal Average MW overdrawn No.of time blocks in which state overdrew MWH Overdrawal Average MW overdrawn TAMIL NADU 293 (28%) (60%) KARNATAKA 247 (23%) (83%) ANDHRA PRADESH 132 (13%) (46%) PUDUCHERRY 235 (22%) (46%) GOA 77 (7%) (22%)3246 KERALA 5 (0%) (16%)97123 STATE OVER <49.0 & 49.5HZ JAN 01 – 11, 2007

74(8%) TIME BLOCKS FREQ WAS BELOW 49Hz 870(91%) TIME BLOCKS FREQ WAS BELOW 49.5 Hz State No.of time blocks in which state overdrew MWH Overdrawal Average MW overdrawn No.of time blocks in which state overdrew MWH Overdrawal Average MW overdrawn TAMIL NADU 54 (6%) (33%) KARNATAKA 65 (7%) (86%) ANDHRA PRADESH 30 (3%) (56%) PUDUCHERRY 9 (1%)16773 (8%)1719 GOA 31 (3%) (34%)84110 KERALA 18 (2%) (47%) STATE OVER <49.0 & 49.5HZ JAN 12 – 21, 2007

76(11%) TIME BLOCKS FREQ WAS BELOW 49Hz 646(96%) TIME BLOCKS FREQ WAS BELOW 49.5 Hz State No.of time blocks in which state overdrew MWH Overdrawal Average MW overdrawn No.of time blocks in which state overdrew MWH Overdrawal Average MW overdrawn TAMIL NADU 41 (6%) (28%) KARNATAKA 65 (10%) (85%) ANDHRA PRADESH 57 (8%) (64%) PUDUCHERRY 4 (1%)4411 (2%)155 GOA 19 (3%) (15%)1134 KERALA 8 (1%) (43%)88812 STATE OVER <49.0 & 49.5HZ JAN 22 – 28, 2007

53(8%) TIME BLOCKS FREQ WAS BELOW 49Hz 601(89%) TIME BLOCKS FREQ WAS BELOW 49.5 Hz State No.of time blocks in which state overdrew MWH Overdrawal Average MW overdrawn No.of time blocks in which state overdrew MWH Overdrawal Average MW overdrawn ANDHRA PRADESH 24 (4%) (57%) KARNATAKA 44 (7%) (85%) KERALA 14 (2%) (49%) TAMIL NADU 32 (5%) (27%) PUDUCHERRY 8 (1%)16858 (9%)14510 GOA 29 (4%) (42%)79411 STATE OVER <49.0 & 49.5HZ JAN 15 – 21, 2007

STATE No. of Time Blocks (overdrew) MWH Overdrawa Average MW overdrawn TAMILNADU KARNATAKA ANDHRA PRADESH PUDUCHERRY GOA KERALA 000 Summary of ODs at Freq. LT 49 HZ. During the week STATE No. of Time Blocks (overdrew) MWH Overdrawa Average MW overdrawn TAMILNADU KARNATAKA ANDHRA PRADESH PUDUCHERRY GOA KERALA TO TO STATE No. of Time Blocks (overdrew) MWH Overdrawa Average MW overdrawn KARNATAKA ANDHRA PRADESH TAMILNADU PUDUCHERRY KERALA GOA TO

STATE No. of Time Blocks (overdrew) MWH Overdrawa Average MW overdrawn ANDHRA PRADESH KARNATAKA KERALA TAMIL NADU PUDUCHERRY GOA Summary of ODs at Freq. LT 49.5 HZ. During the week STATE No. of Time Blocks (overdrew) MWH Overdrawa Average MW overdrawn ANDHRA PRADESH KARNATAKA KERALA TAMIL NADU PUDUCHERRY GOA TO TO STATE No. of Time Blocks (overdrew) MWH Overdrawa Average MW overdrawn ANDHRA PRADESH KARNATAKA KERALA TAMIL NADU PUDUCHERRY GOA TO

STATE No. of Time Blocks for which State overdrew below 49 Hz. MWH Overdrawal below 49 Hz Average MW overdrawn below 49 Hz ANDHRA PRADESH KARNATAKA KERALA TAMIL NADU PUDUCHERRY GOA Summary of ODs at Freq. LT 49 HZ. During the week TO STATE No. of Time Blocks for which State overdrew below 49.5 Hz. MWH Overdrawal below 49.5 Hz Average MW overdrawn below 49.5 Hz TAMILNADU KARNATAKA ANDHRA PRADESH PUDUCHERRY GOA KERALA Summary of ODs at Freq. LT 49.5 HZ. During the week TO

Message TypeBrief Details Type ACaution Message when constituent overdraws at frequency <49.2 Hz. (issued in line with IEGC clause 6.4.4) Type BViolation Message when constituent overdraws at frequency <49 Hz. (issued in line with IEGC clause 6.4.4) Type CViolation Message when constituent continues to overdraw at frequency <49.0 Hz., in spite of RLDC’s instruction to terminate the over drawal (issued in line with IEGC clause and Section 29(2) of I.E. Act 2003)

AVAILABILTY OF GENERATION IN NLC AND NPC STATIONS NEYVELI TS 2 NEYVELI TPS I (EXP) NPC, MAPS NPC, KAPS MONTHS Installed Capacity (Ex-bus) Average available generation (Ex-bus) Average available generation (%) Apr May Jun Jul Aug Sep Oct Nov Dec Jan MONTHS Installed Capacity (Ex-bus) Average available generation (Ex-bus) Average available generation (%) Apr May Jun Jul Aug Sep Oct Nov Dec Jan MONTHS Installed Capacity (Ex-bus) Average available generation (Ex-bus) Average available generation (%) Apr May Jun Jul Aug Sep Oct Nov Dec Jan MONTHS Installed Capacity (Ex-bus) Average available generation (Ex- bus) Average available generation (%) Apr May Jun Jul Aug Sep Oct Nov Dec Jan

TYPICAL DAY UI IMPORT FROM CENTRAL GRID 23 rd OCT 2006

TYPICAL DAY UI IMPORT FROM CENTRAL GRID 24 th OCT 2006

TYPICAL DAY UI IMPORT FROM CENTRAL GRID 4 th FEB 2007

TYPICAL DAY UI EXPORT TO CENTRAL GRID 4 th NOV 2006

IR EXCHANGES OF SR IN THE FORM OF UI TILL (214 WEEK) TRANSACTION WITH WR TRANSACTION WITH ER Energy Imported 928 MU (IMPORT BY SR) 994 MU (IMPORT BY SR) Net Saving to each SR and WR/ER Constituents due to differential tariff Rs. 86 Cr.Rs. 70 Cr. Energy Exported767 MU (EXPORT BY SR) 453 MU (EXPORT BY SR) Net Saving to each SR and WR/ER Constituents due to differential tariff Rs. 77 Cr.Rs. 52 Cr.

IR EXCHANGES OF SR IN THE FORM OF UI FROM TO (44 WEEK) TRANSACTION WITH WR TRANSACTION WITH ER Energy Imported 181 MU (IMPORT BY SR) 152 MU (IMPORT BY SR) Net Saving to each SR and WR/ER Constituents due to differential tariff Rs. 42 Cr.Rs. 35 Cr. Energy Exported113 MU (EXPORT BY SR) 140 MU (EXPORT BY SR) Net Saving to each SR and WR/ER Constituents due to differential tariff Rs. 30 Cr.Rs. 27 Cr.

IR EXCHANGES OF SR IN THE FORM OF UI FROM TO (18 WEEK) TRANSACTION WITH WR TRANSACTION WITH ER Energy Imported 54 MU (IMPORT BY SR) 58 MU (IMPORT BY SR) Net Saving to each SR and WR/ER Constituents due to differential tariff Rs. 28 Cr. Energy Exported24 MU (EXPORT BY SR) 59 MU (EXPORT BY SR) Net Saving to each SR and WR/ER Constituents due to differential tariff Rs. 26 Cr.Rs. 22 Cr.

FREQUENCY SPECTRUM FOR < 49.0 HZ < 49.5 HZ < 50 HZ HZ >50.2 HZ >50.5 HZ Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Avg

FREQUENCY SPECTRUM FROM APRIL 06 TO OCT 06 (UPTO 20 TH OCT 06) < 49.0 HZ< 49.5 HZ< 50.0 HZ HZ>50.2HZ>50.5 HZ Apr May Jun Jul Aug Sep Oct-06 (upto 20 th )

POWER SUPPLY POSITION FOR , & MAXIMUM DEMAND MET: STATE WISE MAXIMUM DEMAND MET: MWMUs 2006 – 07 (Upto Feb 07) 23, – 06 23, – 05 22, AGENCY 2006 – 07 (MW) 2005 – 06 (MW) 2004 – 05 (MW) 2006 – 07 (MUs) 2005 – 06 (MUs) 2004 – 05 (MUs) ANDHRA PRADESH 8,2818,2397, KARNATAKA 5,7585,5585, KERALA 2,6692,5782, TAMIL NADU 8,3718,2097,