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OPEN ACCESS EXPERIANCES AND WAY AHEAD ON 28-04-2008. IN WORKSHOP ON GRID SECURITY AND MANAGEMENT. V K Agrawal, General Manager. MILESTONES : TRANSMISSION SECTOR. Unbundling of CS transmission from generation (Formation of Power Transmission Corporation .. now POWERGRID)

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open access experiances and way ahead on 28 04 2008

OPEN ACCESSEXPERIANCES ANDWAY AHEADON28-04-2008

IN

WORKSHOP ON

GRID SECURITY AND MANAGEMENT

V K Agrawal,

General Manager

milestones transmission sector
MILESTONES : TRANSMISSION SECTOR
  • Unbundling of CS transmission from generation

(Formation of Power Transmission Corporation

.. now POWERGRID)

  • Generation opened to Private Sector
  • Unbundling process started in States

-Orissa Regulatory Commission Act introduced

-State unbundled into Gencos, Transco & Discoms

  • Electricity Regulatory Commission Act passed
  • Process initiated for a comprehensive legislature
  • Electricity Act 2003 enacted in June 2003

2004 CERC Order and Regulations on OPEN ACCESS

open access in inter state transmission
OPEN ACCESS IN INTER-STATE TRANSMISSION

CERC has issued Regulations and the Open Access in Inter State Transmission implemented w.e.f. 6-May-2004.

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

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

transmission pricing objective
Transmission Pricing : Objective
  • Promote efficient day-to-day operation of the bulk power market including power trading
  • Give Economic signal for efficient use of transmission resources
  • Give economic signal for transmission investment
  • Give economic signal for location of new generation and loads
  • Compensate the owner of the transmission system
  • Be simple and practical
diversity details of regional grids in india
Diversity details of Regional Grids in India

REGIONAL GRIDS

NORTHERN REGION

NORTH-EASTERN REGION

EASTERN REGION

WESTERNREGION

SOUTHERN REGION

Deficit Region

Snow fed – run-of –the –river hydro

Highly weather sensitive load

Adverse weather conditions: Fog & Dust Storm

CHICKEN-NECK

Very low load

High hydro potential

Evacuation problems

Low load

High coal reserves

Pit head base load plants

Industrial load and agricultural load

High load (40% agricultural load)

Monsoon dependent hydro

transmission capacity
Transmission Capacity
  • Is a coordinated exercise
  • Transmission system developed as
    • Generation linked Associated Transmission System
    • Inter-regional schemes
    • Grid strengthening schemes
  • Beneficiaries identified apriori
    • Transmission system can be constructed only with commitment
  • N-1 criterion adopted
  • Optimum capacity
  • Inherent design margin available in the transmission system
    • To accommodate the variation of 15% unallocated power
    • Skewed dispatch scenarios
  • Actual margins available in the system
    • Generation outages, unbalanced load growth
    • Laws of physics prevail
total transfer capability ttc

Voltage Limit

Total Transfer Capability: TTC

Thermal Limit

Power Flow

Stability Limit

Total Transfer Capability

Time

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

total available transfer capability
Total & Available Transfer Capability

Transfer Reliability Margin (TRM)

Capacity Benefit Margin (CBM)

TTC

Long Term Open Access (LTOA)

ATC

Short Term Open Access (STOA)

ATC = TTC – TRM – CBM

inter regional capacities
INTER REGIONAL CAPACITIES

30,500 MW

37,486 MW

2,506MW

19,416 MW

16,000

42,420 MW

39,175 MW

11

open access definition as per electricity act 2003
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;”

slide11

“Open Access’ means

  • Nondiscriminatory provision for use of transmission line or distribution system or associated facilities with such line or system by any licensee or consumer or a person engaged in generation in accordance with the regulations specified by the Appropriate Commission.
  • Under sub-section (2) of Section 38, CTU is obliged to provide nondiscriminatory open access to its transmission system for use by
  • (i) any licensee or generating company on payment of transmission charges; or
  • (ii) any consumer as and when such open access is provided by the State Commission under sub-section (2) of Section 42, on payment of transmission charges and a surcharge thereon as may be specified by the Central Commission
open access in inter state transmission1
OPEN ACCESS IN INTER-STATE TRANSMISSION

Products –

Long term Access

Short term Access

Monthly

Advance

First Come First Serve

Day ahead

Same Day transactions

category of open access customers
CATEGORY OF OPEN ACCESS CUSTOMERS
  • LONG TERM : TWENTYFIVE YEARS AND ABOVE
    • Life of the Assets about 25 years
    • Existing beneficiaries of a regional transmission system owned or operated by CTU- deemed long term customers
    • New Long Term Open Access customers: Require BPTA for inter-State transmission
  • SHORT TERM : WHICH IS NOT LONG TERM

- Essentially a Non firm service

    • The service may be curtailed if system security demands.
cerc open access regulations 2008
CERC Open Access Regulations, 2008

3.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:

cerc open access regulations 20081
CERC Open Access Regulations, 2008

Effective 01.04.2008

Regulations cover only Short-term Open Access

Transactions categorized as Bilateral and Collective (through PX)

Earlier Products of Short-Term retained under Bilateral Transactions

Nodal Agency

Bilateral : RLDCs

Collective : NLDC

cerc open access regulations 20082
CERC Open Access Regulations, 2008

Transmission Charges moved from “Contract Path” to “Point of Connection”

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 5 days open access charges.

Moving towards empowerment of SLDCs

regulation 2004 of cerc regulations on short term open access
Regulation 2004 of CERC Regulations on Short-Term Open Access

(06.05.2004 to 31.03.2005)

  • Open Access Duration
  • - Up to One year maximum -single application possible
  • ST Rate
  • - in Rs/MW/Day - Min. Charges for one day
  • Transmission Charges
  • a. Intra Regional – 25% of Long Term Charges
  • b. Inter Regional – 25% of Long Term Charges
  • Operating Charges
  • a. Application fee – Rs. 5000/-
  • b. Scheduling Charges
  • – Rs. 3000/day for each RLDC involved
  • – Rs. 3000/day for each SLDC involved
  • c. Handling &Service Charges - 2% of total charges
regulation 2004 amendment 2005 of cerc regulations on short term open access
Regulation 2004 (Amendment 2005)of CERC Regulations on Short Term Open Access

(01.04.2005 to 31.03.2008)

  • Open Access Duration
  • - Up to three months -single application possible
  • 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
  • a. Intra Regional – 25% of Long Term Charges
  • b. Inter Regional – 50% of Long Term Charges
  • Operating Charges
  • a. Application fee – Rs. 5000/-
  • b. Scheduling Charges
  • – Rs. 3000/day for each RLDC involved
  • – Rs. 1000/day for each RLDC involved
  • c. Handling &Service Charges - Nil
regulation 2008 of cerc regulations on short term open access
Regulation 2008 of CERC Regulationson Short Term Open Access

(From 01.04.2008)

  • Open Access Duration
  • - Bilateral -Up to 3 months separate application for each month
  • Collective: -Only Day ahead
  • ST Rate
  • - in Rs/MWh - Based on Scheduled Energy
  • Transmission Charges
  • Bilateral:
  • Rs.30/MWh – intra- regional
  • Rs.60/MWh – Between adjacent regions
  • Rs90/MWh – Wheeling through one or more region
  • Collective Transactions (Px):
  • -Rs. 30/MWh for each point of injection and drawal
regulation 2008 of cerc regulations on short term open access1
Regulation 2008 of CERC Regulationson Short Term Open Access

Contd …

Operating Charges

Bilateral:

a. Application fee – Rs. 5000/-

b. Scheduling Charges

– Rs. 2000/day for each RLDC involved

– Rs. 2000/day for each SLDC involved

c. Handling & Service Charges –Nil

Collective Transactions:

a. Application fee – Rs. 5000/-

b. Scheduling Charges

– Rs. 5000/day to NLDC for each State involved ;

-NLDC to Share with RLDCs

slide21
Comparison of CERC Regulations on Short-Term Open Access (Regulation 2004, Amendment 2005 and Regulations 2008)
slide22
Comparison of CERC Regulations on Short-Term Open Access (Regulation 2004, Amendment 2005 and Regulations 2008)
slide23

649.86

516.03

967.58

1795.11

233.32

919.71

447.73

270.49

313.93

433.09

434.42

339.98

460.41

359.68

859.05

1462.44

2433.39

881.49

1128.39

700.91

614.15

STOA RATES

2004 AND 2005 AND 2008

NORTHERN REGION

ER-NR

NORTH-EASTERN REGION

Transmission Charges: Bilateral:

Rs.30/MWh – intra- regional

Rs.60/MWh – Between adjacent regions

Rs90/MWh – Wheeling through one or more region

Collective Transactions (Px):

-Rs. 30/MWh for each point of injection and drawal

WR-NR

WESTERNREGION

NER-ER

ER-WR

EASTERN REGION

SR-ER

SR-WR

SOUTHERN REGION

stoa experiances
STOA – EXPERIANCES

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 %

stoa experiances1
STOA – EXPERIANCES

Transactions between extreme corners of the country

RGCCPP ( Kayamkulam) to PSEB

Arunachal Pradesh(NER) to PSEB

TNEB 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) - MSEDCL

NCS Sugar(ANDHARA) – GUVNL

Indorama ( MAH) – APPCC ( ANDHRA)

stoa experiances2
STOA – EXPERIANCES

Due to High demand in the regions, the costly power has been traded through STOA

RGCCPP ( Kayamkulam) (NAPTHA) to PSEB

BSES(KERALA) (DIESEL) to NDMC (DELHI)

Diversity being gainfully utilised by Market players under STOA

Generators PLF has also increased.

issues
Issues

Skewed load – generation levels

Increased line loading

Consents by STU/SLDC for injection of power by embedded customers

Telemetry

Metering

Scheduling

PPAs

empowering sldcs
Empowering SLDCs

UI Settlement of Intra state entities

Before the Implementation of Open Access Regulations 2008, for deviations Various STU/SLDCs are charging differently for embedded customers. In the New Open Access Regulations the issue is addressed

Functional Autonomy of SLDC

typical stoa case
TYPICALSTOA CASE

KAYAMKULAM RGCCPP, NTPC to PSEB

150 MW for 31 days on Round the Clock basis

stoa of kseb rgccpp pseb 0000 hrs 2400 hrs 150mw at rgccpp exbus point for 31 days

SR

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

PSEB

NR

CUSTOMER: NVVNL

TRADER: NVVNL

HVDC BACK TO BACK AT VINDHYACHAL IN WR

INJECTING UTILITY KYCPP,KSEB

DRAWEE UTILITY PSEB

WR

INTERVENING REGION WR

HVDC BACK TO BACK AT BHADRWATHI IN WR

  • INTERVENING REGIONAL LINK
          • SR-WR
  • WR-NR

INTERVENING STATE TRANSMISSION UTILITYKSEB

KERALA

CAPACITY APPROVED 150 MW

DAILY PERIOD 0000-2400 HRS

KAYAMKULAM RGCCPP NTPC)

stoa of kseb rgccpp pseb 0000 hrs 2400 hrs 150mw at rgccpp exbus point for 31 days1

LOSSES IN KERALA 0.75%

AT KERALA PERIPHERY 148.9 MW

LOSSES IN SR 3.12%

AT SR-WR PERIPHERY 144.3 MW

SR

LOSSES IN WR 4.0%

AT WR-NR PERIPHERY 138.5 MW

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

PSEB

NR

EXPORT AT RGCCPP BUS 150 MW

HVDC BACK TO BACK AT VINDHYACHAL IN WR

WR

HVDC BACK TO BACK AT BHADRWATHI IN WR

KERALA

LOSSES IN NR 3.0%

PSEB RECIEVES 134.4 MW

KAYAMKULAM RGCCPP(NTPC)

stoa of kseb rgccpp pseb 0000 hrs 2400 hrs 150mw at rgccpp exbus point for 31 days2

SR

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

Payments as per

Regulation 2004 of CERC

PSEB

APPLICATION PROCESSING FEE

Rs 5000 PER TRANSACTION

NR

  • SCHEDULING CHARGES PER DAY
  • Rs 3000 FOR SRLDC
  • Rs 3000 FOR WRLDC
  • Rs 3000 FOR NRLDC
  • Rs 3000 FOR KSEB

HVDC BACK TO BACK AT VINDHYACHAL IN WR

WR

HVDC BACK TO BACK AT BHADRWATHI IN WR

  • TRANSMISSION CHARGES PER MW PER DAY
  • Rs 700.91 FOR CTU-SR
  • Rs 881.49 FOR SR-WR LINK
  • Rs 339.98 FOR CTU-WR
  • Rs 233.32 FOR WR-NR LINK
  • Rs 649.86 FOR CTU-NR
  • Rs 672.07 FOR KSEB

KERALA

TOTAL TRANSMISSION CHARGES PER UNIT 15.12Ps

KAYAMKULAM RGCCPP(NTPC)

slide37

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

SR

Payments as per

Regulation 2004 Amendment 2005) of CERC

PSEB

NR

APPLICATION PROCESSING FEE

Rs 5000 PER TRANSACTION

  • SCHEDULING CHARGES PER DAY
  • Rs 3000 FOR SRLDC
  • Rs 3000 FOR WRLDC
  • Rs 3000 FOR NRLDC
  • Rs 1000 FOR KSEB

HVDC BACK TO BACK AT VINDHYACHAL IN WR

WR

HVDC BACK TO BACK AT BHADRWATHI IN WR

  • TRANSMISSION CHARGES PER MW PER DAY
  • Rs 843 FOR CTU-SR
  • Rs 1311 FOR SR-WR LINK
  • Rs 357 FOR CTU-WR
  • Rs 600 FOR WR-NR LINK
  • Rs 594 FOR CTU-NR
  • Rs 672.07 FOR KSEB

KERALA

TOTAL TRANSMISSION CHARGES PER UNIT 18.5Ps

KAYAMKULAM RGCCPP(NTPC)

slide38

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

SR

Payments as per

Regulation 2008 of CERC

PSEB

NR

APPLICATION PROCESSING FEE

Rs 5000 PER TRANSACTION

HVDC BACK TO BACK AT VINDHYACHAL IN WR

  • SCHEDULING CHARGES PER DAY
  • Rs 2000 FOR SRLDC
  • Rs 2000 FOR WRLDC
  • Rs 2000 FOR NRLDC
  • Rs 2000 FOR KSEB

WR

HVDC BACK TO BACK AT BHADRWATHI IN WR

  • TRANSMISSION CHARGES PER MWHR
  • Rs 90 FOR Bilateral Wheeling
  • through one or more region
  • Rs 30 FOR KSEB

KERALA

TOTAL TRANSMISSION CHARGES PER UNIT 12.2Ps

KAYAMKULAM RGCCPP(NTPC)

slide39
Comparison of CERC Regulations on Short-Term Open Access (Regulation 2004, Amendment 2005 and Regulations 2008)

Back

stoa of nbvl orissa appcc 0000 2400 hrs 50 mw at injection point from 01 03 08 to 31 03 08
STOA OF NBVL(ORISSA) - APPCC (0000 – 2400 HRS) 50MW AT INJECTION POINT FROM 01.03.08 to 31.03.08

EXPORT AT NBVL(ORISSA) 50 MW

LOSSES IN OPTCL SYSTEM 3%

AT ER PERIPHERY 48.50 MW

LOSSES IN ER 3%

AT ER-SR PERIPHERY 47.05 MW

ER

HVDC BACK TO BACK AT GAZUWAKA IN SR

LOSSES IN SR 3.12%

ORISSA

NBVL

APPCC RECEIVES 45.58 MW

SR

CTU

TOTAL LOSSES FOR TRANSACTION 4.42 MW

ANDHRA PRADESH

slide41

NAVABHARAT(NBVL) (ORISSA)(ER)

to

APPCC (ANDHRA)(SR)

50 MW for 31 days on Round the Clock basis

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.

slide42

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 said that if any petition is filed , the state commission shall consider the same. But the existing open access arrangement to continue.

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