OPEN ACCESS EXPERIENCES and WAY AHEAD N.R.C BABU CHIEF MANAGER (MO), SRLDC, POWERGRID 10.08.2009

OPEN ACCESS EXPERIENCES and

WAY AHEAD

N.R.C BABUCHIEF MANAGER (MO), SRLDC, POWERGRID

10.08.2009

Open Access in Transmission:

Why and What ? Journey … Success Story… Issues… Way Ahead…

INSTALLED CAPACITY

NORTHERN :- 38,726 MW

EASTERN :- 20,815 MW

SOUTHERN :- 42,377 MW

WESTERN :- 46,348 MW

NORTH-EASTERN :- 2,256 MW

TOTAL 150,519 MWSOUTHERN

REGION

WESTERNREGION

EASTERN REGION

NORTHERN REGION

NORTH-EASTERN REGION

REGIONAL GRIDS

Coal

Hydro

Energy Resource Map

Source:

Powerline

(Siemens Ad),

Oct-2006

HYDRO RESOURCES

COAL BELT

MUMBAI

DELHI

CHENNAIBANGALORE

KOLKATTA

Resources are far away from Load centers.

Necessitates Long Transmission links for evacuation

AREAS SHOWN ARE APPROXIMATE AND INDICATIVE

Spatial Distribution

Of Load

Diversity details of Regional Grids in India

REGION REMARKS

Northern Region Deficit RegionHighly weather sensitive load

North Eastern Region

Very low loadHigh hydro potential

Eastern Region Low loadHigh coal reservesPit head base load plants

Western Region Industrial load and agricultural loadHighly Deficit Region

Southern Region High load (40% agricultural load)Monsoon dependent hydro

A strong transmission network backbone is essential in order to transfer the power across the length and breadth of the country :

- Due to high load growth and low generation avenues in Northern and Western Regions

- Due to low load and high generation in Eastern and North Eastern regions

- Due to high load growth and monsoon dependent generation availability in Southern Region

Necessity for strong transmission backbone …

MilestonesMilestones19891989 Unbundling of CS transmission from generation Unbundling of CS transmission from generation

- - (Formation of National Power Transmission (Formation of National Power Transmission

Corporation .. now POWERGRID) Corporation .. now POWERGRID)

19911991 Generation opened to Private Sector Generation opened to Private Sector

1995 Unbundling process started in States1995 Unbundling process started in States

- - State unbundled into Gencos, Transco & DiscomState unbundled into Gencos, Transco & Discom

19981998 Electricity (Amendment) Act 1998 Electricity (Amendment) Act 1998

1998 Electricity Regulatory Commission Act passed1998 Electricity Regulatory Commission Act passed

2003 Electricity Act 2003 enacted in June 20032003 Electricity Act 2003 enacted in June 2003

20042004 CERC Order and Regulations on OPEN ACCESS CERC Order and Regulations on OPEN ACCESS

Open Access: Definition As per Electricity Act,

2003

Section 2 (47)

“Open access” means the non-discriminatory provision for the use of transmission lines or distribution system or associated facilities with such lines or system by any licensee or consumer or a person engaged in generation in accordance with the regulations specified by the Appropriate Commission;”

A More general Definition of “Open Access”A More general Definition of “Open Access”

““Enabling of non-discriminatory Enabling of non-discriminatory

sale/ purchase of electric sale/ purchase of electric

power/energy between two parties power/energy between two parties

utilizing the system of an in- utilizing the system of an in-

between (third party), and not between (third party), and not

blocking it on unreasonable blocking it on unreasonable

grounds”grounds”

Scope/Applicability…

Subject to any other regulations specified by the Commission, the long-term customer shall have first priority for using the inter-State transmission system for the designated use. These Regulations shall apply for utilization of surplus capacity available thereafter on the inter-State transmission system by virtue of-

(a) Inherent design margins;

(b) Margins available due to variations in power flows;

(c ) Margins available due to in-built spare transmission capacity created to cater to future load

growth or generation addition:

As per CERC Regulations 2008 Clause 3

Agencies involved in Short-Term Open Access Transaction

• RLDC (s)• SLDC (s)• CTU• STU (s)• Buyer• Seller• Trader• Power

Exchanges

OPEN ACCESSOPEN ACCESS::

JOURNEY ... JOURNEY ...

Open Access in ISTS: Journey…

CERC Regulations on Open Access in Inter State Transmission implemented w.e.f. 6-May-2004.

CERC amended the above Regulations and the amended Regulations implemented w.e.f 01-04-2005.

CERC on 25-01-2008 amended the Regulations and the new Regulations are implemented w.e.f 01-04-2008.

CERC on 20.05.2009 amended the Regulations and the new Regulations are implemented w.e.f 15.06.2009

Open Access in ISTS: Open Access in ISTS: Journey…Journey…

Long Term : Twenty five years and aboveLong Term : Twenty five years and above - Life of the Assets about 25 years- Life of the Assets about 25 years

- Existing beneficiaries of a regional - Existing beneficiaries of a regional

transmission system owned or operated by transmission system owned or operated by

CTU- deemed long term customersCTU- deemed long term customers

- New Long Term Open Access customers: - New Long Term Open Access customers:

Require BPTA for inter-State transmissionRequire BPTA for inter-State transmission

Short Term : Which is not Long TermShort Term : Which is not Long Term - Essentially a Non firm service- Essentially a Non firm service

- The service may be curtailed if system - The service may be curtailed if system security demands. security demands.

Effective 01.04.2008 Regulations cover only Short-term Open

Access Transactions categorized as

- Bilateral

- Collective (through PX) Earlier Products of Short-Term retained under

Bilateral Transactions Nodal Agency

- Bilateral : RLDCs

- Collective : NLDC

Open Access in ISTS: Journey…CERC OA Regulations 2008

Open Access in ISTS: Journey…

Products –

Short term Access

- Advance

- First Come First Serve

- Day ahead

- Contingency

CERC OA Regulations 2008

Provisions relating to Long Term as per the Open Access Regulations, 2004 to continue, till CERC further notifies.

Long term Access

Both Buyers and Sellers of Collective transactions to bear transmission charges and absorb transmission losses

Inter-Regional links -No Separate treatment. Emphasis on “Scheduling” rather than

“Reservation” SLDC consent mandated along with application In case of Congestion – e-Bidding without Price

Cap Exit Option provided with payment of up to 2

days open access charges. Moving towards empowerment of SLDCs

Open Access in ISTS: Journey… CERC OA Regulations 2009

STOA CASESTOA CASE

APTRANSCO to MPSEB

100 MW for One day from 0000 to 0600 hrs.

APTRANSCO - MPSEB THROUGH NVVNL APTRANSCO - MPSEB THROUGH NVVNL (0000 HRS – 0600 HRS)(0000 HRS – 0600 HRS) 100100 MW AT INJECTION POINT MW AT INJECTION POINT

INJECTING UTILITY APTRANSCO

CUSTOMER: NVVNL

DRAWEE UTILITY MPSEB

CAPACITY APPROVED 100 MW

DAILY PERIOD 0000-0600HRS

AP

WR GRID

MP

HVDC BACK TO BACK AT

BHADRWATHI IN WR

INTERVENING REGIONAL LINK

1. SR-WR

TRADER: NVVNL

APTRANSCO - MPSEB THROUGH NVVNL APTRANSCO - MPSEB THROUGH NVVNL (0000 HRS – 0600 HRS)(0000 HRS – 0600 HRS) 100100 MW AT INJECTION POINTMW AT INJECTION POINT

EXPORT AT AP 100 MW

AT SR PERIPHERY 96.9 MW

MP RECIEVES 93.0 MW

LOSSES IN SR 3.12%

LOSSES IN WR 4%

TOTAL LOSSES FOR

TRANSACTION 7.0 MW

AP

WR GRID

MP


BHADRWATHI IN WR

CT

U

APTRANSCO - MPSEB THROUGH NVVNL APTRANSCO - MPSEB THROUGH NVVNL (0000 HRS – 0600 HRS)(0000 HRS – 0600 HRS) 100100 MW AT INJECTION POINTMW AT INJECTION POINT

APPLICATION PROCESSING FEE

Rs 5000 PER TRANSACTION

TRANSMISSION CHARGES PER MW PER DAY

1. Rs 700.91 FOR CTU-SR

2. Rs 881.49 FOR SR-WR LINK

3. Rs 339.98 FOR CTU-WR

TOTAL TRANSMISSION CHARGE

PER UNIT 34.53Ps/.

SCHEDULING CHARGES PER DAY

1. Rs 3000 FOR SRLDC

2. Rs 3000 FOR WRLDC

AP

WR GRID

MP


BHADRWATHI IN WR

Payments as per Regulation 2004 of CERC

ST Rate - in Rs/MW/Day

- Min. Charges for one day









PER UNIT 13.52Ps/.




AP

WR GRID

MP


BHADRWATHI IN WR

Payments as per Regulation 2004 Amendment 2005) of CERC

ST Rate - in Rs/MW/Day , - Charges as per continuous block of up to 6 hours, 12 hours, and more than 12 hours




TRANSMISSION CHARGES

1. Rs 60 /MWH FOR WHEELING


PER UNIT 7.83Ps/.




AP

WR GRID

MP


BHADRWATHI IN WR


Comparison of CERC Regulations on Short-Term Open Access Comparison of CERC Regulations on Short-Term Open Access (Regulation 2004, Amendment 2005 and Regulations 2008)(Regulation 2004, Amendment 2005 and Regulations 2008)

Old RegulationsOld Regulations

(06.05.2004 to (06.05.2004 to 31.03.2005)31.03.2005)

Amended Amended RegulationsRegulations

(w.e.f. 01.04.2005 to (w.e.f. 01.04.2005 to

31.03.2008)31.03.2008)

Regulations, 2008 Regulations, 2008

(w.e.f. 01.04.2008)(w.e.f. 01.04.2008)

Total STOA Charges Paisa/Unit

34.53


13.52


7.83

Regulations, 2009 Regulations, 2009

(w.e.f. 15.06.2009)(w.e.f. 15.06.2009)

18.29Total STOA Charges Paisa/Unit

18.29

DETAILEDCASE STUDIES.ppt


SUCCESS STORY… SUCCESS STORY…

2800 MW2800 MW6200 MW6200 MW

1700MW1700MW

2500MW2500MW

1100 MW1100 MW

2100 MW2100 MW

38,018 MW

20,516

44,043 MW

2255

1250 MW1250 MW

IR Capacity=15,450 MWIR Capacity=15,450 MW((Till Sep 2009 = 17,650 MW)Till Sep 2009 = 17,650 MW)

Name of the LinkName of the Link Capacity(MW)Capacity(MW)

East-NorthEast-North

Pusauli-Sahupuri 220kV S/cPusauli-Sahupuri 220kV S/c 100100

Sasaram HVDC back-to-backSasaram HVDC back-to-back 500500

Muzaffarpur-Gorakhpur 400kV D/c (Quad)Muzaffarpur-Gorakhpur 400kV D/c (Quad) 20002000

Bihar Sharif-Balia Bihar Sharif-Balia 400kV400kV D/c (Quad) D/c (Quad) 12001200

Patna-Balia 400kV D/c (Quad)Patna-Balia 400kV D/c (Quad) 12001200

Sub-TotalSub-Total 50005000

East-WestEast-West

Budhipadar-Korba 220kV T/cBudhipadar-Korba 220kV T/c 400400

Rourkela-Raipur 400kV D/cRourkela-Raipur 400kV D/c 14001400


West-NorthWest-North

Vindhyachal HVDC back-to-backVindhyachal HVDC back-to-back 500500

Existing 220kV AC LinesExisting 220kV AC Lines 500500

Gwalior-Agra 765kV S/cGwalior-Agra 765kV S/c 11001100


East-SouthEast-South

Gazuwaka HVDC back-to-backGazuwaka HVDC back-to-back 10001000

Existing 220kV AC LinesExisting 220kV AC Lines 100100

Talcher-Kolar HVDC bipole (Enhanced)Talcher-Kolar HVDC bipole (Enhanced) 25002500


West-SouthWest-South

Chandrapur HVDC back-to-backChandrapur HVDC back-to-back 10001000

Other linesOther lines 700700


East-North EastEast-North East

Bongaigaon-Siliguri 400kV D/cBongaigaon-Siliguri 400kV D/c 10001000

Birpara-Salakati 220kV D/cBirpara-Salakati 220kV D/c 250250


TotalTotal 1545015450

39,656 MW

IR LINKS CAPACITY

ER-NR400 kV Barh-Balia D/C: 1200 MWER-WR400 kV Ranchi-Sipat D/C: 1000 MW

Linked with Barh Project

EASTERN REGION

SOUTHERN REGION

WESTERNREGION

NORTHERN REGION


ALL INDIA ATC

ER

ATC = 800 MW

ATC = 750 MW ATC = 950 MW

ATC = 1375 MW

ATC = 1395 MW

ATC = 474 MW

ATC =226 MW

ATC = 920 MW

ATC = 900 MW

ATC = 900 MW

(Figure shown are for April-2008)

What Is ATC

12650 MW

3250 MW7250 MW

5000 MW

2700 MW3650 MW

37,700 MW OF INTER-REGIONAL POWER BY 2012

EASTERN REGION

SOUTHERN REGION

WESTERNREGION

NORTHERN REGION


INTER-REGIONAL TRANSFER BY END OF 11th PLAN (2012)

3000 MW

All India basis

778

3938

5933

9560

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

No.

Of

Tra

nsac

tion

s

2004-05 2005-06 2006-07 2007-08

YEAR

DETAILS OF TRADE UNDER SHORT TERM OPEN ACCESS

16.64 Bu

22.53 Bu

23.60 Bu

28.83 Bu

No. of Transactions

Energy in Billion Units

All India basis

737

845886

0

100

200

300

400

500

600

700

800

900

No.

Of

Tra

nsa

ctio

ns

2005-06 2006-07 2007-08

YEAR

DETAILS OF ADVNCE AND FCFS APPROVED STOA TRANSACTIONS

19.79 Bu

18.49 Bu

23.46 Bu

No. of Transactions


3201

5088

8674

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

No.

Of

Tra

nsa

ctio

ns

2005-06 2006-07 2007-08

YEAR

DETAILS OF DAY AHEAD AND SAME DAY APPROVED STOA TRANSACTIONS

2.74 Bu

5.11 Bu

6.37 Bu

No. of Transactions


AT A GLANCE 2008 – 2009AT A GLANCE 2008 – 2009 EXPORT

IMPORT

AT A GLANCE 2009 – 2010AT A GLANCE 2009 – 2010

IMPORT

Open Access – Success Story

Applications Processed (Since Beginning) > 20,000 No.

Volume (Approved Energy)

(Since Beginning) > 90BUs Applications Approved > 95 %

Refusal/Non-consent by SLDCs > 3 - 4% Refusal due to system constraints < 0.5 %

Open Access – Success Story Transactions between extreme corners of

the countryRGCCPP ( Kayamkulam) to PSEBArunachal Pradesh(NER) to PSEBTNEB to J&K

Large number of Captive Generating plants used STOA and helped in enhancing the power availability in grid. Ugar Sugars (KAR) - JAIPUR (RAJASTHAN)Godavari Sugars (KAR) - MSEDCLNCS Sugar(ANDHARA) – GUVNL

Indorama ( MAH) – APPCC ( ANDHRA)MORE DETAILS

Open Access – Success Story

Even costly power was harnessed to meet the high demand

RGCCPP ( Kayamkulam) (NAPTHA) to PSEBBSES(KERALA) (DIESEL) to NDMC (DELHI)

Diversity being gainfully utilised by Market players under STOA

Delhi/TNEB Export in night ; Import during evening peak

ANDHRA Export during evening peak ; Import in night

Generators PLF has also increased.Kayamkulam GPS

- (From 57 % in 2006-07 to 82 % in 2007-08- 82%)


ISSUES… ISSUES…

Open Access - Issues

Skewed load – generation pattern Constrained Transmission Network

under certain conditions Consents by STU/SLDC for injection of

power by embedded customers Telemetry Metering Scheduling PPAs

Open Access - Issues

UI Settlement of Intra state entities

- Before the Implementation of Open Access

Regulations 2008, for deviations different STU/SLDCs are charging differently for embedded customers.

- At times even the clearance was being withheld for want of approval philosophy.

In the New Open Access Regulations the issues are being addressed


WAY AHEAD… WAY AHEAD…

Open Access- Way Ahead…

Empowerment of SLDCs Intra State ABT Power Exchanges (Pxs) Easy and workable solutions to

tap micro/mini Non conventional

Energy Resources

Open Access- Way Ahead…Empowerment of SLDCs

- Greater role assigned to State Load Despatch Centre (SLDC) to

bring them at par with the Regional Load Despatch Centre (RLDC).

- unless specified otherwise by the concerned State Commission, the

UI rate for intra-State entity shall be 105% (for over-drawals/under

generation) and 95% (for under-drawals / over generation) of the UI

Rate at the periphery of regional entity. This has been done to

facilitate dispute free energy accounting and settlement of

deviations for intra-state entities located in the State where intra-

state ABT has not yet been implemented.

- Empowerment of SLDCs has been made technically and financially.

04/20/2304/20/23 POWERGRIDPOWERGRID 4343

ISGS-1 ISGS-2 ISGS-3

CTU / ISTS SYSTEM RLDC CORDINATES

INTER-STATE

INTRA STATE

STU/INTRA STATE SYSTEM

SGS-1 SGS-2 SGS-3

DISCOM-1 DISCOM-2 DISCOM-3

SLDC CO-ORDINATES

OPEN ACCESS CUSTOMER

~ ~ ~

~ ~ ~

•ISGS: Inter State Generating Stations•SGS: State Generating Stations•CTU: Central Transmission Utility•STU: State Transmission Utility

Inter-State ABT

Intra-State ABT

FURTHER IMPROVEMENT:FURTHER IMPROVEMENT:

INTRA-STATE ABTINTRA-STATE ABT

METERING

COMMERCIAL

INCENTIVES

OPEN-ACCESS

VAR

MANAGEMENT

GENCOS

PARTICIPATION

DISCOMS

SCHEDULES

Open Access- Way Ahead… A Power exchange facilitates equitable,

transparent and efficient trading of power. Bridges the demand supply mismatch by

bringing larger players together for buying and selling in an auction based system.

While maintaining complete anonymity, resolves the constraints in the earlier formats, Viz. search costs, asymmetric information, transaction costs, and counter-party risks.

Open Access- Way Ahead…

“collective transaction” means a set of transactions discovered in power exchange

Scheduling and open access for collective transactions discovered in a power exchange through anonymous simultaneous competitive bidding by buyers and sellers, presently on day-ahead basis.

Open Access- Way Ahead… The ATC declaration is to be done by NLDC on its

web site every day. Depending on the corridor availabilities the solution

is to be found out and the allowed trades will be intimated to NLDC.

If there is no congestion NLDC will accept the trades and issue the schedules to the power exchange and the same will be implemented in RLDC schedules.

In Power Exchange transactions both buyer and seller have to pay the Transmission and operating charges separately.

The transmission losses also have to be borne by the buyer and seller separately.

Typical Approvals- Captive Power PlantsTypical Approvals- Captive Power Plants Captive Power Plant Quantum( MW)

Eastern Region

NBVL(OPTCL) 27

SAIL-DSP(DVC) 20

TISCO(DVC) 60

Bhushan Steel 25

J.P Cement (Rewa) 5

Western RegionIndo Rama synthetics 22

PSKL 10-30

Southern Region

Renuka Sugar 25

Vishwanath Sugar 7.5

Godavari Sugar 25

Ugar Sugar 25

Jindal Steel 200

Nav Bharat 50

NCS Sugar 13 Back

TYPICALTYPICALSTOA CASE STOA CASE

KAYAMKULAM RGCCPP, NTPC to PSEB

150 MW for 31 days on Round the Clock basis

SR

STOA OF KSEB(RGCCPP) - PSEB 0000 HRS – 2400 HRSSTOA OF KSEB(RGCCPP) - PSEB 0000 HRS – 2400 HRS150MW AT RGCCPP EXBUS POINT for 31 days150MW AT RGCCPP EXBUS POINT for 31 days

KE

RA

LA

INJECTING UTILITY RGCCPP,KSEB

TRADER: NVVNL

KAYAMKULAM RGCCPP NTPC)

DRAWEE UTILITY PSEB

CAPACITY APPROVED 150 MW

DAILY PERIOD 0000-2400 HRS

CUSTOMER: NVVNL

WR

NRPSEB

HVDC BACK TO BACK AT VINDHYACHAL IN WR

HVDC BACK TO BACK AT BHADRWATHI IN WR

INTERVENING REGION WR

INTERVENING REGIONAL LINK

SR-WR

WR-NRINTERVENING STATE TRANSMISSION UTILITY KSEB

SR


KE

RA

LA

KAYAMKULAM RGCCPP(NTPC)

WR

NRPSEB



EXPORT AT RGCCPP BUS 150 MW

PSEB RECIEVES 134.4 MW

AT KERALA PERIPHERY 148.9 MW

LOSSES IN KERALA 0.75%

LOSSES IN SR 3.12%

AT SR-WR PERIPHERY 144.3 MW

LOSSES IN WR 4.0%

AT WR-NR PERIPHERY 138.5 MW

LOSSES IN NR 3.0%

SR


KE

RA

LA


WR

NRPSEB









4. Rs 233.32 FOR WR-NR LINK

5. Rs 649.86 FOR CTU-NR

6. Rs 672.07 FOR KSEB




3. Rs 3000 FOR NRLDC

4. Rs 3000 FOR KSEB

TOTAL TRANSMISSION CHARGES PER

UNIT 15.12Ps


SR

KE

RA

LA


WR

NR






1. Rs 843 FOR CTU-SR

2. Rs 1311 FOR SR-WR LINK

3. Rs 357 FOR CTU-WR

4. Rs 600 FOR WR-NR LINK

5. Rs 594 FOR CTU-NR

6. Rs 672.07 FOR KSEB





4. Rs 1000 FOR KSEB


UNIT 18.5Ps

Payments as per Regulation 2004 Amendment 2005) of CERC


PSEB

SR

KE

RA

LA


WR

NRPSEB





TRANSMISSION CHARGES PER MWHR

1. Rs 90 FOR Bilateral Wheeling

through one or more region

1. Rs 30 FOR KSEB





4. Rs 2000 FOR KSEB


UNIT 12.2Ps



Comparison of CERC Regulations on Short-Term Open Access (Regulation 2004, Amendment 2005 and Regulations 2008)

Old Regulations

(06.05.2004 to 31.03.2005)

Amended Regulations

(w.e.f. 01.04.2005 to

31.03.2008)

Regulations, 2008

(w.e.f. 01.04.2008)


15.12


18.5


12.2

Back

STOA OF NBVL(ORISSA) - APPCC (0000 – 2400 HRSSTOA OF NBVL(ORISSA) - APPCC (0000 – 2400 HRS) ) 5050 MW AT INJECTION POINT FROM 01.03.08 to 31.03.08MW AT INJECTION POINT FROM 01.03.08 to 31.03.08

ORISSA

SR

CTU

HVDC BACK TO BACK AT GAZUWAKA IN SR

ER

EXPORT AT NBVL(ORISSA) 50 MW

AT ER-SR PERIPHERY 47.05 MW

LOSSES IN ER 3%

LOSSES IN SR 3.12%

TOTAL LOSSES FOR TRANSACTION 4.42 MW

APPCC RECEIVES 45.58 MW

ANDHRA PRADESH

LOSSES IN OPTCL SYSTEM 3%

AT ER PERIPHERY 48.50 MW

NBVL

NAVABHARAT(NBVL) (ORISSA)(ER) to

APPCC (ANDHRA)(SR)


Consent was not given by OPTCL by citing the following Reasons

As per provision under chapter 4.11,10.5 of OGC Rule 2006 and order dated 29.10.2007 passed by Hon’ble OERC, the real time data of the CGP,(M/s NBVL) is yet to be received at the SLDC, Control Room.

In absence of real time data monitoring facility, SLDC cannot

comply the OGC provision under chapter 3.4(9) during

contingency condition.

Due to the above reasons the Request for Consent is not

accepted.


APPCC (ANDHRA)(SR)50 MW for 31 days on Round the Clock basis

4.10 Data and Communication Facilities Reliable and efficient speech and data communication systems shall be provided to facilitate necessary communication and data exchange, and supervision/control of the grid by the RLDC, under normal and abnormal conditions. All agencies shall provide Systems to telemeterpower system parameter such as flow, voltage and status of switches/transformer taps etc. in line with interface requirements and other guideline made available to RLDC / SLDC. The associatedcommunication system to facilitate data flow up to RLDC/SLDC, as the case may be, shall also be established by the concerned agency as specified by CTU in connection agreement. All agencies in coordination with CTU shall provide the required facilities at their respective ends and RLDC / SLDC as specified in the connection agreement.

FROM IEGC CLUASE 4.10


APPCC (ANDHRA)(SR)


Though the Parties have approached CERC, but the open access transaction is not through.

Consent was not given by KPTCL by citing the following Reasons

The Sugar companies started trading of the surplus power by applying through open access .But initially KPTCL has not consented by citing the reason that the sugar companies are having PPA with ESCOMs.Later the Sugar companies have approached CERC and CERC allowed them to trade under open access.

Aggreived by the order of CERC, KPTCL has approached the Appellate Tribunal. The Tribunal stated that if any petition is filed , the state commission shall consider the same. But the existing open access arrangement to continue.

Total Transfer Capability: TTCTotal Transfer Capability: TTC

Voltage Limit

Thermal Limit

Stability Limit

Total Transfer Capability

Total Transfer Capability is the minimum of the Thermal Limit, Voltage Limit and the Stability Limit

Time

Power Flow

Total & Available Transfer CapabilityTotal & Available Transfer Capability

ATC = TTC – RM

Reliability Margin (RM)

Long Term Open Access (LTOA)

Short Term Open Access (STOA)

TTC

ATC

-50

0

50

100

150

200

250

300

00

:00

01

:00

02

:00

03

:00

04

:00

05

:00

06

:00

07

:00

08

:00

09

:00

10

:00

11

:00

12

:00

13

:00

14

:00

15

:00

16

:00

17

:00

18

:00

19

:00

20

:00

21

:00

22

:00

23

:00

00

:00

48.2

48.4

48.6

48.8

49

49.2

49.4

49.6

49.8

50

SKEWED LOAD-GENERATION PATTERN

SR FREQUENCY

‘NEW’ GRID FREQUENCY

STOA FROM ‘NEW’ GRID

ON 17.04.09

Documents

OPEN ACCESS EXPERIENCES and WAY AHEAD N.R.C BABU CHIEF MANAGER (MO), SRLDC, POWERGRID 10.08.2009