Demarcation of responsibilities (as per IEGC) 1. REGIONAL GRID SHALL BE OPERATED AS LOOSE POWER POOLS WITH STATES HAVING FULL OPERATIONAL AUTONOMY. 2. SYSTEM OF EACH STATE SHALL BE TREATED AS A NOTIONAL CONTROL AREA. STATES SHALL GENERALLY BE EXPECTED TO MAINTAIN THEIR ACTUAL DRAWAL FROM THE REGIONAL GRID CLOSE TO THE NET DRAWAL SCHEDULE (SUM OF SCHEDULED DRAWAL FROM ISGS AND ANY BILATERAL INTER CHANGE). 3. TIGHT CONTROL ON THE DEVIATIONS FROM SCHEDULE BY STATES NOT MANDATED DUE TO NON AVAILABILITY OF REQUISITE FACILITIES FOR MINUTE-TO-MINUTE ON LINE REGULATION OF DRAWALS. DEVIATIONS FROM SCHEDULE TO BE PRICED APPROPRIATELY. 4. WHENEVER SYSTEM FREQUENCY IS BELOW 49.5 Hz, STATES SHALL ENDEAVOR TO RESTRICT THEIR NET DRAWAL TO WITHIN THE SCHEDULE. LOADSHEDING TO BE RESORTED TO IN CASE FREQUENCY < 49.0 Hz.

Demarcation of responsibilities (contd.)  5. SLDCs / STUs TO CARRY OUT SHORT-TERM AND LONG-TERM DEMAND ESTIMATION TO ENABLE ADVANCE PLANNING TO MEET THE CONSUMERS’ LOAD WITHOUT OVERDRAWING. 6. ISGS SHALL BE RESPONSIBLE FOR GENERATING AS PER THE DAILY SCHEDULE ADVISED BY RLDC. 7. ISGS ALLOWED TO DEVIATE FROM THE SCHEDULE, IN LINE WITH THE FLEXIBILITY ALLOWED TO STATES. DEVIATIONS ARE TO BE APPROPRIATELY PRICED. 8. WHENEVER SYSTEM FREQUENCY > 50.3 Hz, ACTUAL NET INJECTION OF ISGS SHOULD NOT EXCEED SCHEDULED DESPATCH. 9. RLDC NAY DIRECT THE SLDCs/ ISGS TO INCREASE/ DECREASE THEIR DRAWAL/ GENERATION IN CASE OF CONTINGENCIES AND SUCH DIRECTIONS SHALL BE IMMEDIATELY COMPLIED.

DEMARCATION OF RESPONSIBILITIES (Contd.) 10.OUTAGE OF GENERATION AND TRANSMISSION SYSTEM TO BE COORDINATED THROUGH OCC/ RLDC. OUTAGE REQUIRING RESTRICTION ON ISGS GENERATION TO BE PLANNED CAREFULLY.  11. AGREEMENTS BETWEEN CONSTITUENTS AND ISGS INDICATING SHARES, DRAWAL PATTERN, TARIFFS, PAYMENT TERMS ETC. TO BE FILED WITH RLDCs AND REB SECRETERIATS FOR BEING CONSIDERED IN REA. SIMILAR FILING REQUIRED IN RESPECT OF BILATERAL AGREEMENTS.  12. FREQUENCY LINKED DESPATCH GUIDELINES, AS ISSUED BY RLDC, SHOULD BE FOLLOWED BY ALL CONSTITUENTS UNLESS OTHERWISE ADVISED BY RLDC.  13. ISGS TO DECLARE PLANT CAPABILITIES FAITHFULLY AND AVOID GAMING. RLDC MAY ASK THE ISGS TO EXPLAIN INSTANCES OF GAMING, IF ANY, WITH NECESSARY BACKUP DATA.

DEMARCATION OF RESPONSIBILITIES (Contd.)  14 CTU WOULD BE ALLOWED TO INSTALL SPECIAL ENERGY

METERS ON ALL INTER-UTILITY EXCHANGE POINTS AND THE CONSTITUENTS WOULD EXTEND THE NECESSARY ASSISTANCE TO CTU IN TIMELY COLLECTION OF METERED DATA.

  15. RLDC TO COMPUTE

- ACTUAL NET INJECTION OF EACH ISGS - ACTUAL NET DRAWAL OF EACH BENEFICIARY 

BASED ON ABOVE METER READINGS AND FORWARD THE SAME TO REB SECRETERIAT ON WEEKLY BASIS BY EACH THURSDAY NOON.

 COMPUTATIONS OF RLDC OPEN TO CHECKING/VERIFICATION BY CONSTITUENTS FOR 20 DAYS.

SCHEDULING AND DESPATCH PROCEDURE                 ALL ISGS STATIONS WITH CAPACITIES AND ALLOCATED SHARES TO BE LISTED OUT       BY 1000 HRS EACH ISGS ADVISES RLDC OF ITS EX-POWER PLANT MW AND MWH CAPABILITIES ANTICIPATED FOR NEXT DAY i.e. 00:00 TO 24:00 HRS       BY 1100 HRS BENEFICIARIES ADVISED OF ABOVE INFORMATION ALONG WITH THEIR ENTITLEMENTS       BY 1500 HRS SLDCs ADVISE RLDC THEIR DRAWAL SCHEDULE FOR EACH OF THE ISGS IN WHICH THEY HAVE SHARE         BY 1700 HRS RLDC CONVEYS THE 'EX-POWER PLANT DESPATCH SCHEDULE (IN MW)' TO EACH ISGS AND 'NET DRAWAL SCHEDULE (IN MW)' TO EACH BENEFICIARY (AFTER DEDUCTING TRANSMISSION LOSSES)     RLDC TO ENSURE SCHEDULES ARE OPERATIONALLY REASONABLE WITH RESPECT TO RAMPING UP/RAMPING DOWN RATES AND THE MINIMUM TO MAXIMUM RATIO OF GENERATION.

SCHEDULING AND DESPATCH PROCEDURE (Contd.)  ISGS/SLDCs TO INFORM ANY MODIFICATIONS IN FORESEEN CAPABILITY/STATION WISE DRAWAL SCHEDULE TO RLDC BY 2200 HRS. RLDC TO ISSUE FINAL SCHEDULE IN SUCH CASES BY 2300 HRS.     REVISIONS IN SCHEDULE PERMITTED DURING THE COURSE OF THE DAY. SUCH REVISIONS EFFECTIVE ONE HOUR AFTER THE FIRST ADVISE IS RECEIVED BY THE RLDC.   RLDC TO CHECK FOR TRANSMISSION CONSTRAINTS, IF ANY, BEFORE FINALISING THE DRAWAL/DESPATCH SCHEDULE.   ON COMPLETION OF THE OPERATING DAY, SCHEDULE, AS FINALLY IMPLEMENTED DURING THE DAY SHALL BE ISSUED BY RLDC. THIS WOULD BE THE DATUM FOR COMMERCIAL ACCOUNTING.   RLDC TO PROPERLY DOCUMENT ALL THE ABOVE INFORMATION EXCHANGED BETWEEN ISGS AND RLDC, CONSTITUENTS AND RLDC ETC.      ALL RECORDS IN RESPECT OF ABOVE OPEN TO ALL CONSTITUENTS FOR ANY CHECKING/VERIFICATION FOR A PERIOD OF 20 DAYS.

Time Schedule of interaction between ISGS, SLDCs and NRLDC for Scheduling

Time Interaction Purpose

A. Day ahead Scheduling:

By 1000 hrs ISGS to NRLDCAvailability forecast, time-wise for next day

By 1100 hrs NRLDC to SLDCsAnticipated ISGS wise entitlement for the next day

By 1500 hrs SLDCs to NRLDCISGS wise requisition, demand, bilateral arrangements etc. anticipated for the next day

By 1700 hrs NRLDC to ISGS/ SLDCsFinal generation schedule to ISGS & net drawal schedule to SLDCs for the next day

By 2200 hrs Any ISGS/ SLDC to NRLDCChanges in availability/ requisition, if any for the next day

By 2300 hrs NRLDC to all ISGS/ SLDCsRevised final generation schedule to ISGS & net drawal schedule to SLDCs respectively for the next day

B. Running day Scheduling:

Any time “a” Any ISGS/ SLDC to NRLDCChanges in availability / requisition, if any for rest of the day

Within next one and half hour of “a” NRLDC to all ISGS/ SLDCs

Revised generation schedule to ISGS & net drawal schedule to SLDCs respectively for rest of the day

ISGS: Inter State Generating StationsSLDC: State Load Despatch Centre

REVISION OF SCHEDULES 

S.no. Event Revision effective from 

1. Forced outage of an ISGS unit.

4th time block after generator advises NRLDC of change in declared capability. 2. Transmission constraint 4th time block + post facto revisions for first three time blocks. 3. Revision of ISGS capability

 6th time block.

4. Revision of requisition by any beneficiary 

6th time block

5. Suo-moto revisions by NRLDC 

4th time block.

 Note: In all the above cases, the 15 minute time block in which NRLDC receives the above advise would be continued as the first one.

SPECIAL SITUATIONS RELATED TO SCHEDULING

  

      STARTING/STOPPING OF ISGS UNITS

·  SCHEDULING OF GAS POWER STATIONS ON LIQUID FIRING

·  STANDING INSTRUCTIONS BY SLDC TO NRLDC FOR DECIDING THE BEST DRAWAL SCHEDULE

·  SCHEDULING OF THE ISGS HYDRO STATIONSALLOCATION OF UNREQUISITIONED SURPLUSES

FORMAT-AAVAILABILITY DECLARATION (Ex BUS) BY COAL FIRED / NUCLEAR ISGS

(TO BE SENT BY ISGS TO NRLDC BY 10:00 HRS) FROM: ( Name of power station ) TO: SCE, NRLDC, NEW DELHI DECLARED CAPABILITY ( Ex-BUS ) OF (Name of power station) FOR DATE: dd.mm.yy MSG NO. ......... REVISION NO .......... DATE OF ISSUE : dd.mm.yy TIME OF ISSUE: hh : mm ( A ) DECLARED CAPABILITY UNIT NOs. CAPABILITY TIME Ex-BUS (MW) (hh : mm)  

( i ) Units anticipated on bar at 00:00 hrs of next day ................ ..................... 00 : 00 

( ii ) Units to go under planned shut down during next day ................ ..................... ............................ ..................... ............

(iii) Units likely to return from planned shutdown ................ ..................... ............ during next day ................ ..................... ............

TIME DURATION DECLARED FROM TO CAPABILITY(hh : mm) (hh : mm) Ex-BUS (MW)

(iv)Declared capability based on A-(i), (ii) & (iii) above 00 : 00 ..................... ............ ................ ..................... ............

................ ..................... ............

................ ..................... ............

................ ..................... ............Ex-BUS MWH* ............

 ( B ) DETAILS OF CONSTRAINTS IF ANY :  

NAME OF OFFICER INCHARGE WITH DESIGNATION  * The Ex-BUS MWH declared capability (DC) is a value which can be lower than the arithmetic sum of the capability declared for different blocks due to fuel or any other technical constraints and should be stated by the station after taking into consideration all such factors.

FORMAT-A , DECLARED CAPABILITY ( Ex-bus ) OF (Name of power station), FOR DATE: dd.mm.yy, REVISION NO .........., ( Page 1/ 1 )

 

FORMAT-BAVAILABILITY DECLARATION (Ex BUS) BY GAS FIRED / LIQUID FIRED ISGS

(TO BE SENT BY ISGS TO NRLDC BY 10:00 HRS) FROM: ( Name of power station ) TO: SCE, NRLDC, NEW DELHI DECLARED CAPABILITY ( Ex-BUS ) OF (Name of power station) FOR DATE: dd.mm.yy MSG NO. .........REVISION NO .......... DATE OF ISSUE : dd.mm.yy TIME OF ISSUE: hh : mm

( A ) DECLARED CAPABILITY UNIT NOs. CAPABILITY TIME Ex-BUS (MW) (hh : mm)   ( i ) Units anticipated on bar at 00:00 hrs of next day ................ ..................... 00 : 00 

( ii ) Units to go under planned shut down during next day ................ ..................... ............................ ..................... ............

(iii) Units likely to return from planned shutdown ................ ..................... ............ during next day ................ ..................... ............

TIME DURATION DECLARED CAPABILITYFROM TO Gas firing Liquid firing(hh : mm) (hh : mm) Ex-BUS (MW) Ex-BUS (MW)

(iv)Declared capability based on A-(i), (ii) & (iii) above 00 : 00 .................. ................. ................. ................ .................. ................. ................................. .................. ................. ................................. .................. ................. ................................. .................. ................. ................. Ex-BUS MWH* ................. .................

TOTAL Ex-BUS MWH* ................... ( B ) GAS / LIQUID CONSUMPTION STATUS 

( i ) Gas allocation for next day ................ MCMD 

( ii ) Usable liquid fuel stock ( current ) ................ kL 

( iii ) Liquid fuel arrival anticipated for next day ............... kL 

( iv ) Gas consumed during previous day ................ MCMD 

( v ) Liquid fuel consumed during previous day ................ kL  ( C ) DETAILS OF CONSTRAINTS IF ANY :   NAME OF OFFICER INCHARGE WITH DESIGNATION * The Ex-BUS MWH declared capability (DC) is a value which can be lower than the arithmetic sum of the capability declared for different blocks due to fuel

or any other technical constraints and should be stated by the station after taking into consideration all such factors.

FORMAT-B , DECLARED CAPABILITY ( Ex-bus ) OF (Name of power station), FOR DATE: dd.mm.yy , EVISION NO........, ( Page 1 / 1 )

 

FORMAT-CAVAILABILITY DECLARATION (Ex BUS ) BY RESERVOIR BASED HYDRO ISGS

(TO BE SENT BY ISGS TO NRLDC BY 10:00 HRS)FROM: ( Name of power station) TO: SCE, NRLDC, NEW DELHIDECLARED CAPABILITY (Ex-BUS) OF (Name of power station) FOR DATE: dd.mm.yy MSG NO. ......... REVISION NO .......... DATE OF ISSUE : dd.mm.yy TIME OF ISSUE: hh : mm

( A ) DECLARED CAPABILITY UNIT NOs. CAPABILITY TIME Ex-BUS (MW) (hh : mm)  

( i ) Capability at 00:00 hrs of next day ................ ..................... 00 : 00 

( ii ) Units to go under planned shut down during next day ................ ..................... ............................ ..................... ............

(iii) Units likely to return from planned shutdown ................ ..................... ............ during next day ................ ..................... ............

TIME DURATION DECLARED FROM TO CAPABILITY(hh : mm) (hh : mm) Ex-BUS (MW)

(iv)Declared capability based on A-(i), (ii) & (iii) above 00 : 00 ..................... ............ ................ ..................... ............................ ..................... ............................ ..................... ............................ ..................... ............

Ex-BUS MWH* ............( B ) RESERVOIR LEVEL AND INFLOWS STATUS 

( i ) Reservoir level (current) ..................... mt / ft 

( ii ) Inflows on previous day ..................... comecs / cusecs 

( iii ) Anticipated inflows for the next day ..................... cumacs / cusecsGENERATION TIME (MW) (hh : mm)

( iv ) Time duration for which maximum generation can be sustained ..................... ............ at a stretch( v ) Minimum 'must-run' generation ( if any ) alongwith time period ..................... ............

 ( vi) Any other constraint

NAME OF OFFICER INCHARGE WITH DESIGNATION * The Ex-BUS MWH declared capability (DC) is a value which can be lower than the arithmetic sum of the capability declared for different blocks due to fuel or

any other technical constraints and should be stated by the station after taking into consideration all such factors.

FORMAT-C , DECLARED CAPABILITY ( Ex-bus ) OF (Name of power station), FOR DATE: dd.mm.yy , EVISION NO........, ( Page 1 / 1 )

 

FORMAT-DAVAILABILITY DECLARATION (Ex BUS) BY RUN OFF THE RIVER HYDRO ISGS

(TO BE SENT BY ISGS TO NRLDC BY 10:00 HRS)FROM: ( Name of power station) TO: SCE, NRLDC, NEW DELHIDECLARED CAPABILITY ( Ex-BUS ) OF (Name of power station) FOR DATE: dd.mm.yy MSG NO. ......... REVISION NO .......... DATE OF ISSUE : dd.mm.yy TIME OF ISSUE: hh : mm

( A ) DECLARED CAPABILITY UNIT NOs. CAPABILITY TIME Ex-BUS (MW) (hh : mm)   ( i ) Capability at 00:00 hrs of next day ................ ..................... 00 : 00  ( ii ) Units to go under planned shut down during next day ................ ..................... ............

................ ..................... ............(iii) Units likely to return from planned shutdown ................ ..................... ............ during next day ................ ..................... ............

TIME DURATION DECLARED FROM TO CAPABILITY(hh : mm) (hh : mm) Ex-BUS (MW)

(iv)Declared capability based on A-(i), (ii) & (iii) above 00 : 0 ..................... ............ ................ ..................... ............................ ..................... ............................ ..................... ............................ ..................... ............

Ex-BUS MWH* ............( B ) INFLOWS STATUS

(i ) Inflows on previous day ..................... comecs / cusecs 

( ii ) Anticipated inflows for the next day ..................... cumacs / cusecsGENERATION TIME (MW) (hh : mm)

( iii ) Time duration for which maximum generation can be sustained ..................... ............ at a stretch

( iv ) Minimum 'must-run' generation ( if any) alongwith time period ..................... ............  

( v) Any other constraint NAME OF

OFFICER INCHARGE WITH DESIGNATION * The Ex-BUS MWH declared capability (DC) is a value which can be lower than the arithmetic sum of the capability declared for different blocks due to fuel or any

other technical constraints and should be stated by the station after taking into consideration all such factors.

FORMAT-D , DECLARED CAPABILITY ( Ex-bus ) OF (Name of power station), FOR DATE: dd.mm.yy , REVISION NO........, ( Page 1 / 1 )

 

FROM : SCE, NRLDC, NEW DELHI

DRAWAL SCHEDULE ( Ex STATE PERIPHERY ) FROM THE GRID FOR ( Name of constituent state ) FOR DATE: dd.mm.yy

MSG NO………. REVISION NO………. DATE OF ISSUE : dd.mm.yy TIME OF ISSUE: hh : mm

BLOCK TIME NO. POINT SINGRAULI RIHAND DADRI(T) UNCH-I UNCH-II NAPS RAPP'B' BAIRASIUL SALAL

( MW ) ( MW ) ( MW ) ( MW ) ( MW ) ( MW ) ( MW ) ( MW ) ( MW )

hh : mm 1 2 3 4 5 6 7 8 91 00:002 00:153 00:304 00:45

DRAWAL SCHEDULE FOR CONSTITUENT STATESFORMAT- J

( TO BE ISSUED BY NRLDC TO CONSTITUENT STATES BY 1700 HRS )TO : ( Name of the constituent state )

Ex-POWER PLANT DRAWAL SCHEDULE FROM STATION