AVAILABILITY BASED TARIFF SCHEDLING PROCEEDURE AND SETTLEMENT MECHANISM UNDER ABT REGIME

AVAILABILITY BASED TARIFFAVAILABILITY BASED TARIFF

SCHEDLING PROCEEDURESCHEDLING PROCEEDUREANDAND

SETTLEMENT MECHANISMSETTLEMENT MECHANISMUNDER ABT REGIMEUNDER ABT REGIME

T. SRINIVAST. SRINIVASMANAGER,SRLDCMANAGER,SRLDC

BANGALOREBANGALORE

LINKS

GIST OF CGS BRIEF OF ABT SCHEDULINGPROCEDURE

SETTLEMENT SYSTEM

UI

SOUTHERN REGIONAL GRIDSOUTHERN REGIONAL GRID▀ Central Generating Stations in the Region are

• Ramagundam Super Thermal Power Stn. : 2,600 MW (200x3 + 500x4)

• Neyveli Lignite Corporation Ltd. - II : 1,470 MW (210 x 7)

• Madras Atomic Power Station : 390 MW (170 x 1 + 220X1)

• Kaiga Atomic Power Station : 440 MW (220x2)

• NLC EXPANSION TPS 1 : 420 MW (210X2)

• TALCHER STAGE II : 2000 MW (500X4) situated

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 AREASCONTROL AREAS

REGIONAL GRID

SEB’S GRID

CS -3CS - 2

CS - 1

CENTRALSHARE

STATEGENR

STATEIPP

DISTR-B

DISTR- A

DISTR- C

SEB - A SEB -CSEB -B

SLDCCOORDINATESDIRECTS

RLDCCOORDINATES

KHAMMAM

VIJAYAWADANAGARJUNASAGAR

VISAKHAPATNAM

(POWERGRID)HYDERABAD

RAICHUR

GOOTY

HOODY

SALEM

UDUMALPET

TRICHUR

MADURAI

TRICHY

MADRAS

NEYVELI

CUDDAPAHDAVANAGERE

KAIGA

115

317

RSTPP

130x216

4x2

182

151

181

173

302

308172

277

279

155

178x

2

PONDICHERY

BANGALORE

SIRSI

MUNIRABAD

PP

P

P

P

P

P

P

P

P

P

PP

P

P

N

KOLAR

PALLOM

KAYANKULAMEDAMON

JEYPORE

63

187

2x78

2x221

54

HOSUR

KADRA

KODASAALY

Nagjhari

1

120

60

MAPS

P

SSLMM

MMDP

THIRUVANATHAPURAM

ALMATHI

NELLORE

400 KV LINE PRESENTLY

OPERATED AT 220 KV

NELAMANGALA

KURNOOL

GAZUWAKA(AP)

SIMHADRI NTPC

HIRIYUR

189

195

267x

2

258

242

175

179

127

130x

2

221x2

146x252x2

197x2

301x2

8x4

15x2

300

28

330

TALGUPPA

AC TRANSMISSION NETWORK IN AC TRANSMISSION NETWORK IN SRSR

KOODANKULAM

THIRNELVALI

KHAMMAM

VIJAYAWADAN’SAGAR

GAZUWAKA


RAICHUR

GOOTY

HOODY

SALEM

UDUMALPET

TRICHUR

MADURAI

TRICHY

MADRAS

NEYVELI

GUTTUR

KAIGA

RSTPP

BHADRAVATI

BANGALORE

MUNIRABAD

P

P

P

P

P

P

P

P

PP

P

P

N

KOLAR

TALCHER

JEYPORE

HOSUR

P

SSLMM

MMDP

THIRUVANANTHAPURAM

NELLORE

NELAMANGALA

KURNOOL

KALPAKKA

SIMHADRI NTPC

HIRIYUR

TALGUPPA

SIRSI

CUDDAPAH1000 MW HVDC BACK TO BACK LINK

2000 MW HVDC BIPOLE

500 KV HVDC LINE

400 KV LINE POWERGRID

400 KV LINE APTRANSCO

400 KV LINE KPTCL

400 KV LINE OPERATED AT 220 KV

THERMAL GENERATING STATION

NEYVELI TPS – 1 (EXP) EXP

400KV SUB-STATION

KHAMMAM

VIJAYAWADAN’SAGAR

GAZUWAKA


RAICHUR

GOOTY

HOODY

SALEM

UDUMALPET

TRICHUR

MADURAI

TRICHY

MADRAS

NEYVELI

GUTTUR

KAIGA

RSTPP

BHADRAVATI

BANGALORE

MUNIRABAD

P

P

P

P

P

P

P

P

PP

P

P

N

KOLAR

TALCHER

JEYPORE

HOSUR

P

SSLMM

MMDP

THIRUVANANTHAPURAM

NELLORE

NELAMANGALA

KURNOOL

KALPAKKA

SIMHADRI NTPC

HIRIYUR

TALGUPPA

SIRSI


2000 MW HVDC BIPOLE

500 KV HVDC LINE



400 KV LINE KPTCL



NEYVELI TPS – 1 (EXP)EXP

400KV SUB-STATION

KHAMMAM

VIJAYAWADAN’SAGAR

GAZUWAKA


RAICHUR

GOOTY

HOODY

SALEM

UDUMALPET

TRICHUR

MADURAI

TRICHY

MADRAS

NEYVELI

GUTTUR

KAIGA

RSTPP

BHADRAVATI

BANGALORE

MUNIRABAD

P

P

P

P

P

P

P

P

PP

P

P

N

KOLAR

TALCHER

JEYPORE

HOSUR

P

SSLMM

MMDP

THIRUVANANTHAPURAM

NELLORE

NELAMANGALA

KURNOOL

KALPAKKA

SIMHADRI NTPC

HIRIYUR

TALGUPPA

SIRSI


2000 MW HVDC BIPOLE

500 KV HVDC LINE



400 KV LINE KPTCL



NEYVELI TPS – 1 (EXP)EXP

400KV SUB-STATION

GENERATORS ABOVE 1000 MW

GENERATORS 500 – 1000 MW

GENERATORS BELOW 500 MW

- HYDRO

- THERMAL

- GAS / NAPTHA

- NUCLEAR

LOAD 500-1500 MW

LOAD 200-500 MW

MAJOR GENERATORS

SCATTERED ACROSS SR

MAJOR LOAD CENTRES SCATTERED ACROSS SR

KOLAR

FROM TALCHER (4 x 500MW)

±500KV

KUDAKULAM APP

2 x 1000MW BACK

CONVENTIONAL METHOD OF CONVENTIONAL METHOD OF OPERATIONOPERATION

SHARE BASED ON ACTUAL GENERATION:-SHARE BASED ON ACTUAL GENERATION:- DOES NOT REFLECT THE AVAILABILITY DOES NOT REFLECT THE AVAILABILITY

OF ISGS –RATHER ITS EX-BUS OF ISGS –RATHER ITS EX-BUS GENERATIONGENERATION

IS FIXED AND TIME INVARIANTIS FIXED AND TIME INVARIANT INSENSITIVE TO CONSTRAINTSINSENSITIVE TO CONSTRAINTS DOES NOT ALLOW FOCUSED CHANGESDOES NOT ALLOW FOCUSED CHANGES

SUB OPTIMAL UTILIZATION OF SUB OPTIMAL UTILIZATION OF RESOURCESRESOURCES

CONVENTIONAL METHOD OF ENERGY CONVENTIONAL METHOD OF ENERGY ACCOUNTINGACCOUNTING

PAYMENTS ARE MADE AS PER THE PAYMENTS ARE MADE AS PER THE DRAWALSDRAWALS

OVER AND UNDER DRAWALS - OVER AND UNDER DRAWALS - UNAVOIDABLEUNAVOIDABLE

UNUTILISED RESOURCES ARE OFTEN UNUTILISED RESOURCES ARE OFTEN BILLED.BILLED.

INFLEXIBLE – BILATERALS, SHORT INFLEXIBLE – BILATERALS, SHORT TERM CONTRACTS – NOT ALLOWEDTERM CONTRACTS – NOT ALLOWED

ADVANTAGES OF SCHEDULINGADVANTAGES OF SCHEDULING

SCHEDULE REFLECTS BOTH –SCHEDULE REFLECTS BOTH –AVAILABILITY OF ISGS & REQUIREMENT AVAILABILITY OF ISGS & REQUIREMENT OF CONSTITUENTOF CONSTITUENT

FLEXIBILITYFLEXIBILITY TIME VARIANT - MIRRORS GRID TIME VARIANT - MIRRORS GRID

BEHAVIOURBEHAVIOUR SENSITIVE TO CONSTRAINTSSENSITIVE TO CONSTRAINTS FOCUSED – SCHEDULE IS NON GENERICFOCUSED – SCHEDULE IS NON GENERIC OPTIMAL UTILIZATION OF RESOURCESOPTIMAL UTILIZATION OF RESOURCES ECONOMIC OPERATIONECONOMIC OPERATION INDEPENDENT OF SETTLEMENT SYSTEM.INDEPENDENT OF SETTLEMENT SYSTEM.

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 or Short Term Open Access

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 AM10 AM ISGSs advise foreseen plant-wise ex- . power plant MW, ISGSs advise foreseen plant-wise ex- . power plant MW, MWh * capability for next dayMWh * capability for next day

11 AM11 AM RLDC advises SEBs their MW, MWh* shares in foreseen RLDC advises SEBs their MW, MWh* shares in foreseen ISGSs' availability ISGSs' availability

3 PM 3 PM SLDCs furnish their ,time-wise MW requisition from the SLDCs furnish their ,time-wise MW requisition from the above, and schedule of bilateral exchanges, if anyabove, and schedule of bilateral exchanges, if any

5 PM5 PM RLDC issues' despatch schedules' for ISGSs and 'net RLDC issues' despatch schedules' for ISGSs and 'net drawal schedules' for SEBs, for each hour the next day drawal schedules' for SEBs, for each hour the next day starting at midnightstarting at midnight

10 PM10 PM SLDCs may inform any change of the above or bilateral SLDCs may inform any change of the above or bilateral exchanges to RLDC, if required by any new development exchanges to RLDC, if required by any new development during the dayduring the day

11 PM11 PM Schedules frozen for the next day. RLDC Issues final Schedules frozen for the next day. RLDC Issues final drawal schedules to each State & Despatch schedule to drawal schedules to each State & Despatch schedule to each ISGS 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 tTime block t Any State may revise drawal schedule Any State may revise drawal schedule from any/all ISGS Any ISGS may from any/all ISGS Any ISGS may revise their foreseen capability revise their foreseen capability

Time block t+3Time block t+3 RLDC to issue revised ‘drawal RLDC to issue revised ‘drawal schedules' and despatch schedulesschedules' and despatch schedules

SRLDC/Comml/IEGC/42

Scheduling ProcessScheduling 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.

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 4th time block.

• ISGSs and/or SLDCs may also revise their schedules during a day. The revised schedules will become effective from the 6th time block.

REVISION OF SCHEDULES/REQUISITIONSREVISION OF SCHEDULES/REQUISITIONS

A)A) OUTAGE OF GENERATING UNITOUTAGE OF GENERATING UNITB)B) REVISED DECLARATION OF AVAILABILITY BY ISGSREVISED DECLARATION OF AVAILABILITY BY ISGSC)C) OUTAGE OF A TRANSMISSION ELEMENTOUTAGE OF A TRANSMISSION ELEMENTD)D) UNFORESEEN LOAD-CRASHUNFORESEEN LOAD-CRASH

TAKES EFFECT FROMTAKES EFFECT FROM

A)A) 44THTH TIME BLOCK IN CASE OF TIME BLOCK IN CASE OF- FORCED OUTAGE OF A GENERATING UNITFORCED OUTAGE OF A GENERATING UNIT- TRANSMISSION CONSTRAINTTRANSMISSION CONSTRAINT- GRID DISTURBANCEGRID DISTURBANCE- SUO MOTO BY RLDCSUO MOTO BY RLDC

B) 6B) 6THTH TIME BLOCK IN CASE OF TIME BLOCK IN CASE OF- REVISION OF DECLARED AVAILABILITY BY ISGSREVISION OF DECLARED AVAILABILITY BY ISGS-- REVISION OF REQUISITIONS BY BENEFICIARIESREVISION OF REQUISITIONS BY BENEFICIARIES

A new scheduling software in Visual Basic A new scheduling software in Visual Basic is developed by SRLDC which has the is developed by SRLDC which has the following advantages:following advantages: - Minimize data entry errors.- Minimize data entry errors.- Faster reconciliation of schedules- Faster reconciliation of schedules- Facilitate electronic data transfer - Facilitate electronic data transfer - Modularly structured, simple and - Modularly structured, simple and practicablepracticable

SCHEDULING METHODOLOGYSCHEDULING METHODOLOGY

The station-wise (Ex-bus) capability The station-wise (Ex-bus) capability would be submitted by the ISGSs would be submitted by the ISGSs in the specified format. ISGSs in the specified format. ISGSs would declare the capability i.e. the would declare the capability i.e. the MW and MWH quantum in the MW and MWH quantum in the absolute values and not in the absolute values and not in the form of some relative percentages form of some relative percentages or in any other manner.or in any other manner.


Based on the declared capability Based on the declared capability & the allocations of different & the allocations of different States / Beneficiaries in different States / Beneficiaries in different ISGSs, the station wise ISGSs, the station wise entitlements would be worked entitlements would be worked out and intimated to all the out and intimated to all the States/Beneficiaries by SRLDC.States/Beneficiaries by SRLDC.


The requisitions would be The requisitions would be submitted by the States in the submitted by the States in the specified format. The States would specified format. The States would submit the requisitions indicating submit the requisitions indicating the quantum desired against the the quantum desired against the given entitlement, and not the given entitlement, and not the quantum surrendered. The quantum surrendered. The requisitions in case of nuclear and requisitions in case of nuclear and run of the river hydro stations run of the river hydro stations would be equal to the entitlements. would be equal to the entitlements.


The details of the despatch and drawal The details of the despatch and drawal schedules and Unrequisitioned, schedules and Unrequisitioned, surpluses shall be made by SRLDC and surpluses shall be made by SRLDC and the information would be exchanged the information would be exchanged through fax and/or through FTP. through fax and/or through FTP.


In the event of any unrequisitioned In the event of any unrequisitioned surpluses, the Owner State ( the surpluses, the Owner State ( the State to which the share actually State to which the share actually belongs and pays the capacity belongs and pays the capacity charges) may find out a suitable charges) may find out a suitable Buyer/ Willing State to take such Buyer/ Willing State to take such unrequisitioned surplus and/or the unrequisitioned surplus and/or the Buyer/Willing State may contact the Buyer/Willing State may contact the Owner State for such exchange. The Owner State for such exchange. The agreed Short Term Open Access agreed Short Term Open Access Transactions be intimated / consented Transactions be intimated / consented to SRLDC by both the States for to SRLDC by both the States for incorporating in the final schedules. incorporating in the final schedules.


Any unrequisitioned surpluses still Any unrequisitioned surpluses still available, can be agreed for available, can be agreed for Short Term Open Access Short Term Open Access Transactions between the Transactions between the concerned ISGS and one or more concerned ISGS and one or more desiring States. The agreed Short desiring States. The agreed Short Term Open Access Transactions Term Open Access Transactions from ISGS to a State be intimated from ISGS to a State be intimated to SRLDC by both the agencies to SRLDC by both the agencies (ISGS as well as States) for (ISGS as well as States) for incorporation in the final schedule. incorporation in the final schedule.


During the current day in case During the current day in case the Owner State requisitions the Owner State requisitions back its surrendered share, then back its surrendered share, then the same is withdrawn from the the same is withdrawn from the other State/ States to which it other State/ States to which it was allocated as surplus energy was allocated as surplus energy and the schedules are revised in and the schedules are revised in line with the Grid Code.line with the Grid Code.


While making or revising their While making or revising their declaration of capability the declaration of capability the generators shall ensure that the generators shall ensure that the declared capability during peak declared capability during peak hours is not less than during hours is not less than during other hours.other hours.

SCHEDULING METHODOLOGYSCHEDULING METHODOLOGY While communicating the requisitions, the While communicating the requisitions, the States shall ensure that:States shall ensure that:

maximum economy and efficiency in the maximum economy and efficiency in the operation of the power system in the State operation of the power system in the State is achieved while requisitioning and /or is achieved while requisitioning and /or surrendering power from different ISGSs surrendering power from different ISGSs vis-à-vis from their own stations. vis-à-vis from their own stations.

the requisitions are operationally the requisitions are operationally reasonable, particularly in terms of reasonable, particularly in terms of ramping-up / ramping-down rates and ratio ramping-up / ramping-down rates and ratio between minimum and maximum between minimum and maximum generation levels, and are in line with the generation levels, and are in line with the agreed philosophy in the region amongst agreed philosophy in the region amongst different agencies. different agencies.


In the event of despatch schedule in In the event of despatch schedule in respect of a particular ISGS, (as agreed respect of a particular ISGS, (as agreed between ISGS and the State constituents in between ISGS and the State constituents in respect of thermal units it would be taken respect of thermal units it would be taken as 70%) the changes in requisition between as 70%) the changes in requisition between two successive blocks is higher than a ramp two successive blocks is higher than a ramp up/down quantum, then the State/States up/down quantum, then the State/States due to which such anomaly is being due to which such anomaly is being experienced would be requested by SRLDC experienced would be requested by SRLDC to change its/their requisition in that to change its/their requisition in that particular ISGS, to make the schedule particular ISGS, to make the schedule operationally reasonable. operationally reasonable.


While issuing the final schedules, While issuing the final schedules, SRLDC shall check that the schedules SRLDC shall check that the schedules do not give rise to any transmission do not give rise to any transmission constraints. In case any imperssible constraints. In case any imperssible constraints/ anomalies are foreseen, constraints/ anomalies are foreseen, the RLDC shall moderate the the RLDC shall moderate the schedules to the required extent , schedules to the required extent , under intimation to the concerned under intimation to the concerned agencies.agencies.


During the periods of low demand in the During the periods of low demand in the region, in spite of all efforts if the despatch region, in spite of all efforts if the despatch schedule of an ISGS(s) during certain blocks schedule of an ISGS(s) during certain blocks in the off-peak period remains below the in the off-peak period remains below the minimum agreed value, and the concerned minimum agreed value, and the concerned ISGS (s) is not able to operate the units ISGS (s) is not able to operate the units due to technical constraints, then the due to technical constraints, then the concerned ISGS(s) may close down some concerned ISGS(s) may close down some unit(s) in consultation with SRLDC and the unit(s) in consultation with SRLDC and the despatch schedule of the ISGS(s) shall be despatch schedule of the ISGS(s) shall be revised accordingly. Under such a situation revised accordingly. Under such a situation the net drawal schedule of the beneficiary the net drawal schedule of the beneficiary (ies) having share in the ISGS(s), may get (ies) having share in the ISGS(s), may get reduced during peak hours also. reduced during peak hours also.


If at any point of time SRLDC If at any point of time SRLDC observes that there is need for observes that there is need for revision of schedules in the revision of schedules in the interest of better system interest of better system operation, it may do so on its operation, it may do so on its own and make it effective in line own and make it effective in line with the grid code provisions. with the grid code provisions.


While entering into a bilateral While entering into a bilateral agreement, the concerned agreement, the concerned parties shall ensure that the parties shall ensure that the agreements are clear and agreements are clear and explicit and contains all the explicit and contains all the relevant details which may be relevant details which may be necessary from scheduling and necessary from scheduling and computation of energy flow.computation of energy flow.

BACK

Payment to Inter State Generating Payment to Inter State Generating Stations (ISGS) from beneficiaries Stations (ISGS) from beneficiaries

underunder

Availability Based Tariff Availability Based Tariff (ABT)(ABT)

Capacity chargesCapacity charges Energy chargesEnergy charges Unscheduled Interchange (UI)Unscheduled Interchange (UI)

CAPACITY CHARGECAPACITY CHARGE

Capacity charge will be related Capacity charge will be related to ‘availability’ of the to ‘availability’ of the generating station and the generating station and the percentage capacity allocated percentage capacity allocated to the state. ‘Availability’ for to the state. ‘Availability’ for this purpose means the this purpose means the readiness of the generating readiness of the generating station to deliver ex-bus output station to deliver ex-bus output expressed as a percentage of expressed as a percentage of its rated ex-bus output its rated ex-bus output capability.capability.

ENERGY CHARGEENERGY CHARGE

Energy charges shall be worked Energy charges shall be worked out on the basis of a paise per out on the basis of a paise per kwh rate on ex-bus energy kwh rate on ex-bus energy scheduled to be sent out from scheduled to be sent out from the generating station as per the generating station as per the following formulathe following formula

Energy chargesEnergy charges = = Rate of Rate of energy energy charges (paise/kwh) x charges (paise/kwh) x ScheduledScheduled Generation (ex-bus Generation (ex-bus MWh)MWh)

UNSCHEDULED INTERCHANGE (U I) UNSCHEDULED INTERCHANGE (U I) ::

Variation in actual generation / drawal with Variation in actual generation / drawal with respect to scheduled generation / drawal shall respect to scheduled generation / drawal shall be accounted for through Unscheduled be accounted for through Unscheduled Interchange (UI).Interchange (UI).

UI for generating station shall be equal to its UI for generating station shall be equal to its total actual generation minus its scheduled total actual generation minus its scheduled generation.generation.

UI for beneficiary shall be equal to its total UI for beneficiary shall be equal to its total actual drawal minus its total scheduled actual drawal minus its total scheduled drawal.drawal.

UNSCHEDULED INTERCHANGE (U I) UNSCHEDULED INTERCHANGE (U I) ::

UI shall be worked out for each 15 UI shall be worked out for each 15 minute time block.minute time block.

Charges for all UI transactions Charges for all UI transactions shall be based on average shall be based on average frequency of the time block.frequency of the time block.

UI rates shall be frequency UI rates shall be frequency dependent and uniform dependent and uniform throughout the country.throughout the country.

0

50

100

150

200

250

300

350

400

450

500

550

600

650

48.9 49 49.1 49.2 49.3 49.4 49.5 49.6 49.7 49.8 49.9 50 50.1 50.2 50.3 50.4 50.5 50.6 50.7 50.8 50.9 51

Frequency ----------->

UI ra

te

-----

------

------

>

Below 49.0 Hz UI rate =570 p/u

At 50.0 Hz UI rate =150 p/u

At 49.8 Hz UI rate =210 p/u

Above 50.5 Hz UI rate =0 p/u

UI RATE

Rate of Unscheduled Drawal/Injection

Frequency Frequency (Hz)(Hz)

Rate Rate (p/u)(p/u)

Above 50.5Above 50.5 00

50.050.0 150150

49.849.8 210210

49.0 and 49.0 and belowbelow

570570

AVAILABILITY BASED TARIFFAVAILABILITY BASED TARIFF

(A)(A) CAPACITY CHARGECAPACITY CHARGE

(B)(B) ENERGY CHARGEENERGY CHARGE

(C)(C) ADJUSTMENT FOR DEVIATIONS ADJUSTMENT FOR DEVIATIONS

(U I CHARGE)(U I CHARGE)(A) = (A) = a function of the Ex-Bus MW availability of a function of the Ex-Bus MW availability of

Power Plant for the day declared before the day Power Plant for the day declared before the day starts x SEB’s % allocation from the plantstarts x SEB’s % allocation from the plant

(B) = MWh for the day as per Ex-Bus drawal schedule (B) = MWh for the day as per Ex-Bus drawal schedule for the SEB finalised before the day starts x for the SEB finalised before the day starts x Energy charge rateEnergy charge rate

(C) = (C) = Σ (Actual energy interchange in a 15 minute time Σ (Actual energy interchange in a 15 minute time block – scheduled energy interchange for the block – scheduled energy interchange for the time block) x UI rate for the time block time block) x UI rate for the time block

TOTAL PAYMENT FOR THE DAY = (A) + (B) TOTAL PAYMENT FOR THE DAY = (A) + (B) ± (C) ± (C)

FEATURES :FEATURES : ((A) and (B) do not depend on actual plant A) and (B) do not depend on actual plant

generation / drawal. No metering required generation / drawal. No metering required for this as they are based on off-line for this as they are based on off-line figures. All deviations taken care of by (C)figures. All deviations taken care of by (C)

No complication regarding deemed No complication regarding deemed generation.generation.

Perpetual incentive for maximizing Perpetual incentive for maximizing generation and reducing drawal during generation and reducing drawal during deficit, but no incentive to over generate deficit, but no incentive to over generate during surplus.during surplus.

BACK

UI IN SR (FROM 01/01/03 TO 04/12/05)UI IN SR (FROM 01/01/03 TO 04/12/05)

TOTAL UI TURNOVER :- 10141 MUTOTAL UI TURNOVER :- 10141 MU

TOTAL UI AMOUNT DISBURSED:- 1933 TOTAL UI AMOUNT DISBURSED:- 1933 CRCR

AVG WEEKLY TRANSACTION:- 66 MUAVG WEEKLY TRANSACTION:- 66 MU

AVG WEEKLY UI AMOUNT DISBURSED:- 13 CRAVG WEEKLY UI AMOUNT DISBURSED:- 13 CRContd..

APAP KARKAR KERKER TNTN PONDPONDYY

Total UI Total UI exported(-) / exported(-) / Imported(+) Imported(+)

in MUsin MUs

--46884688 47344734 679679 17021702 -199-199

Total amount Total amount paid in paid in

Crores Rs.Crores Rs.-899-899 862862 117117 448448 -36-36

Average rate Average rate of UI in of UI in

paise/unitpaise/unit192192 182182 173173 263263 183183

SUMMARY OF UI – 153WKSSUMMARY OF UI – 153WKS(FROM 01/JAN/03 TO 04/DEC/05)(FROM 01/JAN/03 TO 04/DEC/05)

Contd..

OD UD AND UI RATES OF CONSTITUENTS

182 179

234

200184

149

379

185

0

50

100

150

200

250

300

350

400

AP KAR KER TN

RA

TE

(P

AIS

E/U

NIT

)

OVER DRAWAL (PURCHASE) UNDER DRAWAL (SOLD)

226MU

4914MU

4766MU

31MU

1315MU

2281MU

579MU

636MU

Inter Regional Links

Present IR CapacityPresent IR Capacity= 9,500 MW= 9,500 MW

700 MW700 MW

1200MW1200MW

2000MW2000MW

1200 MW1200 MW

900 MW900 MW30,500 MW

16,000

32,700 MW

34,500 MW

2300

1850 MW1850 MW

1650 MW1650 MW

Contd..

DEVELOPMENT OF NATIONAL GRID

NER

ER

NR

WR

SR

EXISTING

500MW

MW1000

MW500

GAZUWAKA

CHANDRAPUR

VINDHYACHAL

SASARAM

UNDERCONST.

EXISTING

400 kV

220 kV

BONGAIGAONBIRPARA

MALDA

KORBA BUDHIPADAR

KOLHAPUR

BELGAUM

U.SILERU

BALIMELA

DEHRISAHUPURI

MALANPUR

AURAIYA

PHASE-I(By 2002)

HVDC STATION

KOLAR

(KARNATAKA)

TALCHER

ORISSA)

TALCHER KOLAR HVDC LINE

LENGTH:100 KMS

INTER REGIONAL LINKS

CHIKKODI

KOLHAPUR

UJJAIN

KOTLA

INTER REGIONAL EXCHANGES

265

221

150 138

0

50

100

150

200

250

300

350

SR RATE WR RATE SR RATE ER RATE

RA

TE

(P

AIS

A/K

WH

) -

>

IMPORT BY SR FROM WR (668 MU)

IMPORT BY SR FROM ER (805 MU)

INTER REGIONAL EXCHANGES

146 139

286 295

0

50

100

150

200

250

300

350

SR RATE WR RATE SR RATE ER RATE

RA

TE

(P

AIS

A/K

WH

) -

>

EXPORT BY SR TO WR (610 MU)

EXPORT BY SR TO ER (311 MU)

INTER-REGIONAL EXCHANGES DETAILS INTER-REGIONAL EXCHANGES DETAILS UPTO 151 WKS (Till 20.11.05)UPTO 151 WKS (Till 20.11.05)

WRWR ERER

Net Energy Net Energy TransactionTransaction

57.5 MU 57.5 MU

IMPORT BY IMPORT BY SRSR

493.9MU493.9MU

IMPORT BY SRIMPORT BY SR

Amount Due toAmount Due to

SR ConstituentsSR ConstituentsRs. 79.7 Cr.Rs. 79.7 Cr. Rs. 24.5 Cr.*Rs. 24.5 Cr.*

Amount Amount Credited TO SR Credited TO SR

ConstituentsConstituents

Rs. 76.2 Cr.Rs. 76.2 Cr. Rs. 24.5 Cr.Rs. 24.5 Cr.

*from 06.09.04 (when ER exchanges computed @ respective frequencies)

AVAILABILITY BASED TARIFF SCHEDLING PROCEEDURE AND SETTLEMENT MECHANISM UNDER ABT REGIME

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