SOUTHERN REGIONAL GRID ▀ Centre Generating Stations in the Region are Ramagundam Super Thermal Power Stn. : 2,600 MW (200x x4) Neyveli Lignite Corporation Ltd. - II : 1,470 MW (210 x 7) Madras Atomic Power Station : 340 MW (170 x 2) Kaiga Atomic Power Station : 440 MW (220x2) NLC EXPANSION TPS 1 : 420 MW (210X2) TALCHER STAGE II : 1500 MW (500X3) present in ER ▀ Beneficiaries in southern Region are. ANDHRA PRADESH KARNATAKA KERALA TAMIL NADU Union Territory of Pondicherry NLCMINES GOA has share of 100MW from RSTPS

CONTROL AREAS REGIONAL GRID SEB’S GRID CS -3 CS - 2 CS - 1 CENTRAL SHARE STATE GENR STATE IPP DISTR -B DISTR - A DISTR - C SEB - A SEB -CSEB -B SLDC COORDINATES DIRECTS RLDC COORDINATES

C H A P T E R - 7 SCHEDULING & DESPATCHING CODE Demarcation of Responsibilities. Each Region is a loose power pool and each state is a notional Control Area. (Decentralized Scheduling and Dispatch). RLDC can direct SLDCs/ISGSs in case of system contingencies, to change drawal/injection and if time permits, RLDC will ascertain whether situation has arisen due to => Deviations from schedule => Bilateral Exchange These can be terminated by RLDC.. All joint/bilateral agreements to be filed with RLDC/REB Secretariat.SEMs to be installed by CTU at all interconnection points for recording Actual Interchanges and MVARh drawals.. Regional Energy Accounting to be done by REB Sectt.based on metered and processed data (Actual net injection of ISGS and actual net drawal of each beneficiary) received from RLDC. SRLDC/Comml/IEGC/33

Settlement Systems*. Accounting on weekly basis. Capacity and Energy Charges billing on monthly basis Billing of adjustments for deviations on weekly basis RLDC to furnish data to REB Secretariat by Thursday noon for week ending Sunday. REB Secretariat to finalize and issue REA by Tuesday, for seven day period ending on penultimate Sunday. All data to be retained for 20 days (for RLDC & REB) for verification. Commercial Mechanism * Availability Based Tariff ( a) Capacity Charge (b) Energy Charge (c) Adjustment for Deviations SRLDC/Comml/IEGC/34

Scheduling Process On Day-l 10 AMISGSs advise foreseen plant-wise ex-. power plant MW, MWh * capability for next day 11 AMRLDC advises SEBs their MW, MWh* shares in foreseen ISGSs' availability 3 PMSLDCs furnish their,time-wise MW requisition from the above, and schedule of bilateral exchanges, if any 5 PMRLDC issues' despatch schedules' for ISGSs and 'net drawal schedules' for SEBs, for each hour the next day starting at midnight 10 PMSLDCs may inform any change of the above or bilateral exchanges to RLDC, if required by any new development during the day 11 PMSchedules frozen for the next day. RLDC Issues final drawal schedules to each State & Despatch schedule to each ISGS SRLDC/Comml/IEGC/41

On Day 0 On Day + 1. RLDC to issue before-the- fact Capacity Declaration/Schedules finally implemented by RLDC (Datum for accounting and working out average ex-power plant capability). Time block tAny State may revise drawal schedule from any/all ISGS Any ISGS may revise their foreseen capability Time block t+3RLDC to issue revised ‘drawal schedules' and despatch schedules SRLDC/Comml/IEGC/42

Scheduling Process Scheduling for the next day Every day by 10 AM, RLDC collects the foreseen plant-wise ex-power plant MW capability of ISGSs for the next day By 11 AM, RLDC advises SEBs, on a 15 minutes blockwise level, their entitled MW shares from each ISGSs’ availability By 3 PM, RLDC receives block-wise MW requisition from SLDCs and also the schedule of bilateral exchanges, if any By 5 PM, RLDC issues ‘despatch schedules’ for ISGSs and ‘net drawal schedules’ for SEBs, 15 minutes block-wise for the next day starting at midnight. Upto 10 PM SLDCs may inform any change of the above or bilateral exchanges to RLDC, if required by any new development during the day. At 11 PM Schedules are frozen for the next day. RLDC issues final drawal schedules to each State & Despatch schedule to each ISGS.

1000 MW HRS24 Forecast ex-bus capability of power plant SEB - A’s entitlement (40%) Entitlement for which Capacity charges Are payable by SEB-A Schedule for which Energy charges Are payable by SEB- A Declared Capability for which Capacity charges Are recieveable by ISGS Gen.Sched. for which Energy charges Are recieavable by ISGS

Scheduling Process Any change of schedule for the current day In case of any forced outage of a unit, or in case of any transmission bottleneck or in the interest of better system operation, RLDC may revise the schedules. The revised schedules will become effective from the 4 th time block. ISGSs and/or SLDCs may also revise their schedules during a day. The revised schedules will become effective from the 6 th time block.

REVISION OF SCHEDULES/REQUISITIONS A) OUTAGE OF GENERATING UNIT B) REVISED DECLARATION OF AVAILABILITY BY ISGS C) OUTAGE OF A TRANSMISSION ELEMENT D) UNFORESEEN LOAD-CRASH TAKES EFFECT FROM A) 4 TH TIME BLOCK IN CASE OF - FORCED OUTAGE OF A GENERATING UNIT - TRANSMISSION CONSTRAINT - GRID DISTURBANCE - SUO MOTO BY RLDC B) 6 TH TIME BLOCK IN CASE OF - REVISION OF DECLARED AVAILABILITY BY ISGS -REVISION OF REQUISITIONS BY BENEFICIARIES

REACTIVE ENERGY CHARGE : PAYABLE FOR : 1.VAR DRAWALS AT VOLTAGES BELOW 97% 2. VAR INJECTION AT VOLTAGES ABOVE 103% RECEIVABLE FOR: 1.VAR INJECTION AT VOLTAGES BELOW 97% 2. VAR DRAWAL AT VOLTAGES ABOVE 103% APPLIED FOR VAR EXCHANGES BETWEEN : A)BENEFICIARY SYSTEM AND ISTS - THROUGH A POOL ACCOUNT B)TWO BENEFICIARY SYSTEMS ON INTER-STATE TIES - BY THEMSELVES RATE: 4 paise/kvArh ( UPTO ) WITH 5% ESCALATION PER YEAR

Regional Energy Account & Settlement System Capacity and Energy Charges billing on monthly basis Settlement of adjustments for deviations ( UI) on weekly basis RLDC to furnish data to REB Secretariat by Thursday noon for previous week ending Sunday REB Secretariat to finalize and issue REA by Tuesday, for seven day period ending on penultimate Sunday All accounts open for 20 days for verifications and clarifications

SRLDC/Comml/IEGC/47