(Updated in 2025) [As Amended by Noti. No. F.No. L-1/250/2019/CERC., dt. 26/06/2025 - Amendments in Regulation 2(aa-i), Regulation 2(aa-ii), Regulation 9(8), Regulation 12(1)(a), Regulation 13(2), Regulation 13(2)(a), Regulation 13(2)(b), Regulation 13(2)(e), Regulation 13(2)(f), Regulation 13(2)(h), Regulation 13(2)(i), Regulation 13(3), Regulation 13(6), Regulation 13(14), Regulation 13(15) No. L-1/250/2019/CERC1, dt. 27/10/2023 - Amendments in Regulation 5(3)(D) and Regulation 6(1)(a) No. L-1/250/2019/CERC, dt. 27/10/2023 - Amendments in Regulation 2(1)(i-i), Regulation 11(3), Regulation 12(3) and Regulation 13(3)(12) and Notification No. F. No.L-1/250/2019/CERC, dt. 07/02/2023] [4th May, 2020] In exercise of the powers conferred under Section 178 read with Part V of the Electricity Act, 2003 (36 of 2003), and all other powers enabling it in this behalf, and after previous publication, the Central Electricity Regulatory Commission hereby makes the following regulations:

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S.Regulation 1 Short title, extent and commencement.--

(1) These regulations may be called the Central Electricity Regulatory Commission (Sharing of Inter-State Transmission Charges and Losses) Regulations, 2020.

(2) These regulations shall apply to all Designated ISTS Customers (DICs), Inter-State Transmission Licensees, National Load Despatch Centre (NLDC), Regional Load Despatch Centres (RLDCs), State Load Despatch Centres (SLDCs) and Regional Power Committees (RPCs).

(3) These regulations shall come into force from the date 1 to be separately notified by the Commission.

S.Regulation 3 Principles of sharing transmission charges.--

(1) The transmission charges shall be shared 1[x x x x] on monthly basis based on the Yearly Transmission Charges such that:--

(a) The Yearly Transmission Charges are fully recovered; and

(b) Any adjustment on account of revision of the Yearly Transmission Charges are recovered.

(2) Yearly Transmission Charges for transmission system shall be shared on monthly basis by 2[drawee] DICs in accordance with Regulations 5 to 8 of these regulations subject to the exceptions provided in clauses (3), (6), (9) and (12) of Regulation 13 of these regulations.

3[(3) Not with standing any provision to the contrary in the PPA entered into between the drawee DIC and the generating station or the seller, the bills for sharing of transmission charges shall be raised on the Drawee DICs in terms of these Regulations and the settlement of the transmission charges inter se between the Drawee DICs and the generating station or the seller, wherever necessa

S.Regulation 4 Components of Transmission Charges.--

Transmission charges for DICs shall have the following components:

a. National Component (NC);

b. Regional Component (RC);

c. Transformer Component (TC); and

d. AC System Component (ACC).

S.Regulation 2 Definitions.--

(1) In these Regulations, unless the context otherwise requires:--

a) 'Act' means the Electricity Act, 2003 (36 of 2003);

1[b) 'Associated Transmission System' or 'ATS' shall have the same meaning as defined in GNA Regulations;]

c) 'Basic Network' means the power system at voltage levels of 110 kV and above containing all the power system elements including generating station and transmission systems;

d) 'Billing month' means the month in which bills for transmission charges are raised by the Central Transmission Utility in accordance with these regulations;

e) 'Billing period' means the month for which bills are raised in a billing month by the Central Transmission Utility;

f) 'buyer' shall have the same meaning as defined in Central Electricity Regulatory Commission (Deviation Settlement Mechanism and Related Matters) Regulation, 2014 and any subsequent amendments or re-enactments thereof;

g) 'COD of the Associated


S.Regulation 5 Components and sharing of National Component (NC).--

(1) National Component shall be sum of the following components:

(a) National Component-Renewable Energy (NC-RE); and

(b) National Component-HVDC (NC-HVDC).

(2) National Component-Renewable Energy shall comprise of the Yearly Transmission Charges for transmission systems developed for renewable energy projects as identified by the Central Transmission Utility.

(3) National Component-HVDC shall comprise of the following:

(a) 100% of Yearly Transmission Charges for "back-to-back HVDC" transmission system;

(b) 100% of Yearly Transmission Charges for Biswanath-Chariali/Alipurdwar to Agra HVDC transmission system;

(c) Yearly Transmission Charges of Mundra-Mohindergarh 2500 MW HVDC transmission system corresponding to 1005 MW capacity:Provided that Yearly Transmission Charges corresponding to 1495 MW for the said transmission system shall be borne by M/s Adani Power (Mundra) Limited or its successor company; and<


S.Regulation 6 Components and sharing of Regional Component (RC).--

(1) Regional Component shall be sum of the following components:

³[(a) Regional Component of HVDC (RC-HVDC) comprising of 70% of Yearly Transmission Charges of HVDC transmission systems planned to supply power to the concerned region, except HVDC transmission systems covered under sub clauses (a), (b) and (c) of Clause (3) of Regulation 5:
Provided that where an inter-regional HVDC transmission system planned to supply power to a particular region is operated to carry power in the reverse direction due to system requirements, the percentage of Yearly Transmission Charges of such transmission systems to be considered in the Regional component and the National component shall be calculated as follows:
HVDCr (in %) = (MW capacity of power flow in the reverse direction / MW capacity of power flow in the forward direction) X100
Where, HVDCr (in %) is more than 30%, the Yearly Transmission Charges corresponding to HVDCr shall be considered in the National compon


S.Regulation 7 Components and sharing of Transformer Component (TC).--

(1) Transformer Component for a State shall comprise of Yearly Transmission Charges for inter-connecting transformers (ICTs) ¹[along with their associated bays and downstream bays] planned for drawal of power by the concerned State. A list of such transformers for each State shall be provided by the Central Transmission Utility to the Implementing Agency:

Provided that where the Yearly Transmission Charges of ICTs for a State are not available, the Yearly Transmission Charges for such transformers shall be worked out and provided by the Central Transmission Utility, apportioning Yearly Transmission Charges approved by the Commission for the integrated project, based on indicative capital cost. For transformers used for drawl requirement of more than one State, Yearly Transmission Charges shall be apportioned to such States in the ratio of number of feeders from such transformers for each State.

(2) Transformer Component for a State shall be borne and shared


S.Regulation 8 Components and sharing of AC System Component (ACC).--

(1) AC System Component shall comprise of the Yearly Transmission Charges, excluding the Yearly Transmission Charges covered under Regulations 5 to 7 of these regulations.

(2) AC System Component shall have following components:

(i) Usage Based Component (AC-UBC); and

(ii) Balance Component (AC-BC).

(3) The Yearly Transmission Charges of AC-UBC shall be shared by drawee DICs ¹[x x x x] corresponding to their respective usage of the transmission lines, in accordance with Regulation 9 of these regulations.

(4) The Yearly Transmission Charges under AC-BC shall be the balance Yearly Transmission Charges for AC System Component after apportioning the charges for AC-UBC.

²[(5) Transmission charges under AC-BC shall be shared by all drawee DICs inproportion to their quantum of GNA and GNARE.]




S.Regulation 9 Computation of share of transmission charges under AC-UBC.--

(1) Base case shall be prepared by the Implementing Agency corresponding to the peak block for each billing period comprising of:

(a) Basic network for the power system corresponding to the peak block of the billing period; and

(b) Actual generation and actual demand, in MW, at each node of the basic network corresponding to the peak block.

(2) DICs, inter-State transmission licensees, NLDC, RLDCs, SLDCs and STUs shall provide data for sub-clauses (a) and (b) of clause (1) of this Regulation and the Yearly Transmission Charges to the implementing agency in the stipulated formats as per the timelines specified in Regulation 24 of these regulations.

(3) MTC covered under AC-UBC shall be apportioned on transmission lines of the basic network, whose charges have been included in the Yearly Transmission Charges. Such apportionment shall be made on per circuit kilometer basis for each conductor configuration at each voltage level as per the methodology specifie


S.Regulation 10 Sharing of Transmission Losses.--

(1) Transmission losses for ISTS shall be calculated on all India average basis by the implementing agency for each week, from Monday to Sunday, as under:

[(In-Dr)/(Ir)] X 100

Where:

'In' denotes sum of injection into the ISTS at regional nodes for the week;

'Dr' denotes sum of drawal from the ISTS at regional nodes for the week;

'Ir' denotes sum of injection into the ISTS at regional nodes less injection from projects covered under clause (1) of Regulation 13 of these regulations for the week.

(2) Drawal schedule of DICs shall be prepared as per provisions of the Grid Code taking into account the transmission losses of the week preceding the last week as calculated in accordance with clause (1) of this Regulation:

Provided that while preparing drawal schedule of DICs in respect of projects covered under clause (1) of Regulation 13, transmission losses shall be considered as zero.

(3) Transmission losses for ISTS shall be consi


S.Regulation 11 1[Transmission charges for T-GNA and T-GNARE].--

²[(1) T -GNA Rate (in Rs./MW/time-block) shall be published for each billing month by the Implementing Agency on its website which shall be calculated State-wise as under:

Transmission charges for all drawee DICs located in the State, for the billing month,as calculated in accordance with Regulation 5 to 8 of these regulations (in rupees) X 1.10 / (number of days in a month X 96 X GNA and GNAre quantum, in MW, for all such drawee DICs located in the State considered for billing, for the corresponding billing period).

(2) Transmission charges shall be payable by the entities granted T-GNA or T-GNAre under Regulation 26.1 of the GNA Regulations, as per the last published T-GNA rate for the State in which such entity is located.

(3) Transmission charges for T-GNA and T-GNAre collected in a billing month, shall be reimbursed to the drawee DICs in proportion to their share in the first bill in the following billing month, ³[after adjustment of s


S.Regulation 12 Transmission Deviation.--

¹[(1) Transmission Deviation, in MW, shall be computed as under:

(a) For a generating station including ESS and captive generating plant, transmission deviation shall be net metered ex-bus injection, in a time block in excess of GNA of such entity:

Provided that for a hydro-generating station, schedules for overload capacity as permissible under the Grid Code during peak season shall not be considered for computing the transmission deviation:

Provided that for a hydro-generating station, schedules for overload capacity as permissible under the Grid Code during peak season shall not be considered for computing the transmission deviation:

Provided further that transmission deviation charges shall not be levied for the quantum of over-injection for providing primary response by a generating station, subject to verification of such over-injection by concerned RPC:

⁴[Provided also that for a Generating Station having dual connecti


S.Regulation 13 Treatment of transmission charges and losses in specific cases.--

(1) No ¹[transmission losses] for the use of ISTS shall be payable for:

(a) generation based on solar power resource for the useful life of the projects commissioned during the period from 01/07/2011 to 30/06/2017.

(b) generation based on solar or wind power resources for a period of 25 years from the date of commercial operation, fulfilling the following conditions:

(i) Such generation capacity has been awarded through competitive bidding; and

(ii) Such generation capacity has been declared under commercial operation during the period from 01/07/2017 to 12/02/2018 for solar based resources or during the period from 30/09/2016 to 12/02/2018 for wind based resources; and (iii) Power Purchase Agreement(s) have been executed for sale of power from such generation capacity to the distribution companies for compliance of their renewable purchase obligation.

(c) generation based on solar or wind power resources, for a period of 25 years from t


S.Regulation 14 Accounting.--

(1) The implementing agency shall publish transmission charges payable by drawee DICs ¹[x x x x] for the billing month in rupee terms.

(2) Regional Transmission Accounts and Regional Transmission Deviation Accounts for the billing month for the DICs shall be prepared by the Secretariat of the respective Regional Power Committee on the basis of:

(a) DIC-wise transmission charges for the billing month, as furnished by the implementing agency; and

(b) Meter readings of all Special Energy Meters for computation of transmission deviations for every time block of the corresponding billing period, as furnished by respective RLDCs.

(3) Regional Transmission Accounts and Regional Transmission Deviation Accounts shall be issued by the Secretariat of respective Regional Power Committee to DICs, the Central Transmission Utility and inter-State transmission licensees and also be displayed on the website of respective Regional Power Committees.

(4) Wh


S.Regulation 15 Billing.--

(1) The Central Transmission Utility shall, raise the bills for transmission charges, as per the timelines specified in subclause (d) of clause (5) of Regulation 14 of these regulations.

(2) The bills for transmission charges for the DICs shall be raised by the Central Transmission Utility under the following three categories:

¹[(a) The first bill of each billing month shall contain the transmission charges for the billing period determined in accordance with Regulations 5 to 8 of these Regulations as adjusted in accordance with Regulation 13(2) of these regulations.]

²[(b) The second bill shall be raised in the months of June, September, December and March every year for the quarter ending on 31st March, 30th June, 30th September and 31st December respectively to adjust variations on account of any revision in transmission charges allowed by the Commission, including incentives as applicable:

Provided that under-recovery or over-rec


S.Regulation 16 Due Date.--

Notwithstanding any provision to the contrary in the applicable Tariff Regulations or Transmission Service Agreement under tariff based competitive bidding, due date in relation to any bill raised by the Central Transmission Utility under these regulations shall mean the forty fifth (45th) day from the date of presentation of such bill.




S.Regulation 17 Rebate.--

Notwithstanding any provision to the contrary in the applicable Tariff Regulations or Transmission Service Agreement under tariff based competitive bidding, rebate on payment of bills shall be governed as under:

(a) A rebate of 1.50% shall be allowed for payment of bills within a period of 5 days of presentation of bills.

Explanation: In case of computation of '5 days', the number of days shall be counted consecutively without considering any holiday. However, in case the last day or 5th day is an official holiday, the 5th day for the purpose of rebate shall be construed as the immediate succeeding working day.

(b) A rebate of 1% shall be allowed where payments are made on any day after 5 days and within a period of 30 days of presentation of bills.




S.Regulation 18 Late Payment Surcharge.--

¹[Late payment surcharge shall be payable by the concerned DIC as per the LPS Rules in case the payment of any bill for charges payable under these Regulations is delayed by a DIC, beyond the due date.]




S.Regulation 19 Letter of Credit and other instruments of Payment Security Mechanism.--

(1) The Central Transmission Utility shall, at least ¹[2 (two) months] prior to the ²[effective date of GNA or GNARE] or Medium Term Open Access, in respect of a DIC, give a notice to such DIC, indicating the date of operationalisation of such Long-Term Access or Medium Term Open Access and requiring the DIC to furnish an irrevocable, unconditional and revolving Letter of Credit through a scheduled bank or any other acceptable instrument of payment security mechanism in favour of the Central Transmission Utility. Not later than 1 (one) month prior to the ³[effective date of GNA or GNARE] or Medium Term Open Access, the DIC shall open such Letter of Credit or provide such acceptable instrument of payment security mechanism that shall be operative from a date prior to the Due Date of its first bill.

(2) In case tripartite agreement for securitisation on account of arrears against the transmission charges with the Government of India exists, the


S.Regulation 20 Collection and Disbursement.--

(1) The Central Transmission Utility shall collect transmission charges on account of the first bill for transmission system covered under Regulations 5 to 8 of these regulations and disburse the amount so collected to inter-State transmission licensees and intra-State transmission licensees in proportion to their Yearly Transmission Charges:

Provided that in case of shortfall in collection of transmission charges, the amount to be disbursed to inter-State transmission licensees and intra-State transmission licensees shall be reduced pro-rata from their share of Yearly Transmission Charges.

(2) Transmission charges collected by the Central Transmission Utility for transmission systems covered under clauses (3), (6), (8), (9) and (12) of Regulation 13 and not covered under Regulations 5 to 8 of these regulations shall be disbursed directly to the concerned inter State transmission licensee or the generating company, as the case may be.

(3) The Central Transmissio


S.Regulation 21 Consequences of non-payment of dues by a DIC.--

¹[Failure on the part of a DIC to make payment of transmission charges against the bills by the due date under these regulations shall make such DIC liable for action by the Central Transmission Utility, on behalf of inter-State transmission licensee(s) in accordance with LPS Rules.]




S.Regulation 22 Transition Period.--

Notwithstanding anything to the contrary contained in these regulations, bills for the first two billing periods, after these regulations come into force, shall be based on the Central Electricity Regulatory Commission (Sharing of Inter-State Transmission Charges and Losses) Regulations, 2010.




S.Regulation 23 Procedures to be framed under these Regulations.--

(1) The implementing agency shall, within 90 (ninety) days of the notification of these regulations, publish the detailed procedures and formats for collection of data and information from various agencies and entities for implementation of the provisions of these regulations after stakeholder consultation.

(2) The implementing agency shall be responsible for development and maintenance of the software for implementation of these regulations and shall get the same audited before it is put to use.

(3) The Central Transmission Utility, in discharge of its functions under these regulations, may make such procedure as may be necessary, which is not inconsistent with these regulations or any other regulations of the Commission.

¹[(4) The Implementing Agency shall, within 45 (forty-five) days of the notification of this amendment, publish the revised detailed procedures for implementation of the provisions of this amendment after stakeholder consultation.]<


S.Regulation 24 Timeline for furnishing the information.--

(1) On or before the end of the billing period, all entities whose transmission elements have declared COD during the billing period shall submit to the Implementing Agency, network data, date(s) of commercial operation of the new transmission element and Yearly Transmission Charge of such transmission element in the format stipulated by the Implementing Agency.

(2) The implementing agency shall publish, on its website, the peak block for the billing period on the first day of the month following the billing period.

(3) Within 7 (seven) days after end of the billing period, the Central Transmission Utility shall submit indicative cost for transmission lines for each conductor configuration at each voltage level to the implementing agency.

(4) Within 7 (seven) days after end of a billing period, DICs shall submit the following to the implementing agency for the billing period:

(a) MW and MVAR data for actual injection or actual drawal at various nodes or a


S.Regulation 25 Information to be published by the implementing agency.--

(1) The information to be made available, on its website, by the implementing agency shall include:

(a) The Basic Network, generation at nodes and drawal at nodes considered for the Base Case and the load flow results, for each billing period;

(b) Assumptions made in the Base Case, if any;

(c) Details of transformers, list of transmission elements and corresponding transmission charges considered under Regional Component for the billing period;

(d) Transmission system covered under National Component;

(e) New transmission systems added during the billing period;

(f) Yearly transmission charges for the transmission elements considered in the billing period, as submitted by the inter-State transmission licensees and intra-State transmission licensees;

(g) Details of ¹[GNA and GNARE] in respect of each DIC for the billing period;

(h) Detailed calculations of indicative cost for arriving at the average cost in respect of


S.Regulation 26 Savings and Repeal.--

(1) Save as otherwise provided in these regulations, Central Electricity Regulatory Commission (Sharing of inter -state transmission charges and losses) Regulations, 2010, as amended from time to time, is hereby repealed.

(2) Notwithstanding such repeal, anything done or any action taken or purported to have been done or taken under the repealed regulations shall be deemed to have been done or taken under these regulations.




S.Regulation 27 Power to Relax.--

The Commission may, for reasons to be recorded in writing, relax any of the provisions of these regulations on its own motion or on an application made before it by an interested person.




S.Regulation 28 Power to Remove Difficulties.--

If any difficulty arises in giving effect to any of the provisions of these regulations, the Commission may, by general or specific order, make such provisions not inconsistent with the provisions of the Act, as may appear to be necessary for removing the difficulty.




S.ANNEXURE I

ANNEXURE I

THE HYBRID METHODOLOGY FOR USAGE BASED TRANSMISSION CHARGES

1. Utilisation of the network is generally determined in terms of either average utilization or marginal utilization of the transmission assets. Pricing of transmission services based on average or marginal utilization of the network branches is known as Average Participation or Marginal Participation method respectively. A usage based methodology determines the power that flows through each of the lines in the system due to the existence of a certain network user. 2. Marginal Participation Method 2.1 The marginal participation method analyses how the flows in the grid are modified when minor changes are introduced in the generation or load of agent i. The proce S.ANNEXURE II ANNEXURE II Surge Impedance Loading to be considered for determination of utilisation of transmission line under these Regulations Voltage (KV) S.I.L (MW) 765 2250 765 Op at 400 614 400 515 400 Op at 220 155 220 132 132 50   SIL for Transmission line built with HTLS conductor or Quad conductor shall be considered, as twice the above said values for respective voltage, for the purpose of these Regulations. S.ANNEXURE III 1[ANNEXURE III Methodology of calculation of waiver of transmission charges (3) Methodology for calculation of waiver of transmission charges in respect of drawee DICs which have obtained GNA and GNA (a) The transmission charges towards ISTS for each drawee DIC shall be computed in accordance with Regulations 5 to 8 of these regulations. (b) The waiver of transmission charges shall be calculated in the following manner:-- (i) Waiver of a drawee DIC other than a drawee DIC which has obtained “GNA ” shall be calculated based on the following formulae: S.Central Electricity Regulatory Commission (Sharing of Inter-State Transmission Charges and Losses) (Second Amendment) Regulations, 2023 All Amendments Incorporated at Appropriate place CENTRAL ELECTRICITY REGULATORY COMMISSION NOTIFICATION New Delhi, the 20th October, 2023 No. L-1/250/2019/CERC.-- In exercise of the powers conferred under Section 178 read with Part V of the Electricity Act, 2003 (36 of 2003), and all other powers enabling it in this behalf, and after previous publication, the Central Electricity Regulatory Commission hereby makes the following regulations to amend the Central Electricity Regulatory Commission (Sharing of Inter-State Transmission Charges and Losses) Regulations, 2020 (hereinafter referred to as “the Principal Regulations”) namely:-- 1. SHORT TITLE AND COMMENCEMENT: (1) These regulations may be called the Central S.Central Electricity Regulatory Commission (Sharing of Inter-State Transmission Charges and Losses) (Third Amendment) Regulations, 2023 All Amendments Incorporated at Appropriate place CENTRAL ELECTRICITY REGULATORY COMMISSION NOTIFICATION New Delhi, the 26th October, 2023 No. L-1/250/2019/CERC1.-- In exercise of the powers conferred under Section 178 read with Part V of the Electricity Act, 2003 (36 of 2003), and all other powers enabling it in this behalf, and after previous publication, the Central Electricity Regulatory Commission hereby makes the following regulations to amend the Central Electricity Regulatory Commission (Sharing of Inter-State Transmission Charges and Losses) Regulations, 2020 (hereinafter referred to as “the Principal Regulations”), namely: 1. SHORT TITLE AND COMMENCEMENT: (1) Thes S.Central Electricity Regulatory Commission (Sharing of Inter-State Transmission Charges and Losses) (Fourth Amendment) Regulations, 2025 All Amendments Incorporated at Appropriate place CENTRAL ELECTRICITY REGULATORY COMMISSION NOTIFICATION New Delhi, the 26th June, 2025 F.No. L-1/250/2019/CERC-- In exercise of the powers conferred under Section 178 read with Part V of the Electricity Act, 2003 (36 of 2003), and all other powers enabling it in this behalf, and after previous publication, the Central Electricity Regulatory Commission hereby makes the following regulations to amend the Central Electricity Regulatory Commission (Sharing of Inter-State Transmission Charges and Losses) Regulations, 2020 (hereinafter referred to as “the Principal Regulations”) namely: 1. SHORT TITLE AND COMMENCEMENT: