CERC Sharing Regulations
The CERC has issued the Sharing of Inter-State Transmission Charges and Losses regulations dated 15th June 2010 and new regulations dated 4th May 2020. The primary purpose of these regulations is to develop and implement a national transmission tariff framework which is sensitive to distance, direction and quantum of flow of electric energy.
Sharing of Inter-State Transmission Charges and Losses Regulations, 2020
Resolution By
CERC
Notification No. and date
L-1/250/2019/CERC Dated 4th May 2020
Objectives
To develop and implement a national transmission tariff framework sensitive to distance, direction and quantum of flow
Regulations called as
The Central Electricity Regulatory Commission (Sharing of Inter-State Transmission Charges and Losses) Regulations, 2020
Effective Control period
Date to be separately notified by the Commission
Applicability
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).
Principles of sharing transmission charges
1. The transmission charges shall be shared amongst the DICs on monthly basis based on the Yearly Transmission Charges (YTC).
2. YTCs for transmission system shall be shared on monthly basis by DICs in accordance with Regulations 5 to 8 of these regulations.
3. Long Term Access or Medium Term Open Access for projects covered under Clause (1) of Regulation 13 shall not be considered for apportionment of YTC under Regulations 5 to 8 of these regulations.
4.Sharing of transmission charges for DICs shall be based on the technical and commercial information provided by the DICs, inter-State transmission licensees, NLDC, RLDCs, SLDCs and CTU to the Implementing Agency.
[clause 3]
2. YTCs for transmission system shall be shared on monthly basis by DICs in accordance with Regulations 5 to 8 of these regulations.
3. Long Term Access or Medium Term Open Access for projects covered under Clause (1) of Regulation 13 shall not be considered for apportionment of YTC under Regulations 5 to 8 of these regulations.
4.Sharing of transmission charges for DICs shall be based on the technical and commercial information provided by the DICs, inter-State transmission licensees, NLDC, RLDCs, SLDCs and CTU to the Implementing Agency.
[clause 3]
Processes of sharing transmission charges and losses
1. Transmission charges for DICs shall have National Component (NC), Regional Component (RC), Transformer Component (TC)and AC System Component (ACC)
2. National Component shall be sum of NC Renewable Energy (NC-RE) and NC-HVDC , Regional Component shall be sum of RC-HVDC and YTC for static compensators (STATCOMs), static VAR compensators (SVCs), spare reactors and any other transmission element(s) located in the concerned region, Transformer Component(TC) for a State shall comprise of YTC for inter-connecting transformers (ICTs) planned for drawal of power by the concerned State and AC System Component shall have Usage Based Component (AC-UBC) and Balance Component (AC-BC)
3. Transmission charges for Short Term Open Access Rate (in paise/kWh) shall be published for each billing month by the Implementing Agency which shall be calculated State-wise.
4. Transmission charges for Short Term Open Access shall be payable by generating stations and embedded entities located in the State.
5. No transmission charges for Short Term Open Access, shall be payable by a distribution licensee which has Long Term Access or Medium Term Open Access or both, or by a trading licensee
6. Transmission losses for ISTS shall be calculated on all India average basis by the Implementing Agency for each week.
[chapter 2]
2. National Component shall be sum of NC Renewable Energy (NC-RE) and NC-HVDC , Regional Component shall be sum of RC-HVDC and YTC for static compensators (STATCOMs), static VAR compensators (SVCs), spare reactors and any other transmission element(s) located in the concerned region, Transformer Component(TC) for a State shall comprise of YTC for inter-connecting transformers (ICTs) planned for drawal of power by the concerned State and AC System Component shall have Usage Based Component (AC-UBC) and Balance Component (AC-BC)
3. Transmission charges for Short Term Open Access Rate (in paise/kWh) shall be published for each billing month by the Implementing Agency which shall be calculated State-wise.
4. Transmission charges for Short Term Open Access shall be payable by generating stations and embedded entities located in the State.
5. No transmission charges for Short Term Open Access, shall be payable by a distribution licensee which has Long Term Access or Medium Term Open Access or both, or by a trading licensee
6. Transmission losses for ISTS shall be calculated on all India average basis by the Implementing Agency for each week.
[chapter 2]
Specific transmission charges applicable for a Designated ISTS Customer
1. No transmission charges and losses for the use of ISTS shall be payable for:
1.1. Generation based on solar power resource for the useful life of the projects commissioned during the period from 1.7.2011 to 30.6.2017
1.2. Generation based on solar or wind power resources for a period of 25 years from the date of commercial operation
2. A generating station or any other sellerwho has been granted LTA or MTOA and has entered into PPA for supply of power, then the transmission charges towards such LTA and MTOA shall be determined at the drawal nodes, and billed to the buyer(s) after COD of generating station or unit(s).
3.When COD of a generating station or unit(s) thereof is delayed and the Associated Transmission System has achieved COD, which is not earlier than its SCOD, the generating station shall pay Yearly Transmission Charges for the Associated Transmission System.
4.A generating station is connected to both ISTS and intra-State transmission system, only ISTS charges and losses shall be applicable on the quantum ofLTA and MTOA corresponding to capacity connected to ISTS.
[chapter 3]
1.1. Generation based on solar power resource for the useful life of the projects commissioned during the period from 1.7.2011 to 30.6.2017
1.2. Generation based on solar or wind power resources for a period of 25 years from the date of commercial operation
2. A generating station or any other sellerwho has been granted LTA or MTOA and has entered into PPA for supply of power, then the transmission charges towards such LTA and MTOA shall be determined at the drawal nodes, and billed to the buyer(s) after COD of generating station or unit(s).
3.When COD of a generating station or unit(s) thereof is delayed and the Associated Transmission System has achieved COD, which is not earlier than its SCOD, the generating station shall pay Yearly Transmission Charges for the Associated Transmission System.
4.A generating station is connected to both ISTS and intra-State transmission system, only ISTS charges and losses shall be applicable on the quantum ofLTA and MTOA corresponding to capacity connected to ISTS.
[chapter 3]
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 for the week.
(2) Transmission losses for ISTS shall be considered as zero while preparing injection schedule of DICs including that for Collective Transactions in the Power Exchanges.
(Clause 10)
[(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 for the week.
(2) Transmission losses for ISTS shall be considered as zero while preparing injection schedule of DICs including that for Collective Transactions in the Power Exchanges.
(Clause 10)
Accounting of charges
1. The Implementing Agency shall publish transmission charges payable by drawee DICs and injecting DICs with untied LTA for the billing month in Rupee terms.
2.Transmission charges shall be prepared by the Secretariat of the respective Regional Power Committee on the basis of DIC-wise transmission charges for the billing month as furnished by the Implementing Agency and meter readings of all Special Energy Meters for computation of Transmission Deviations, as furnished by respective RLDCs.
[clause 14]
2.Transmission charges shall be prepared by the Secretariat of the respective Regional Power Committee on the basis of DIC-wise transmission charges for the billing month as furnished by the Implementing Agency and meter readings of all Special Energy Meters for computation of Transmission Deviations, as furnished by respective RLDCs.
[clause 14]
Billing
1. The Central Transmission Utility shall, raise the bills for transmission charges, as per the timelines specified.
2. The bills for transmission charges for the DICs shall be raised by the CTU for following three categories:
3.1. The first bill of each billing month shall contain the transmission charges for the billing period
3.2. The second bill shall be raised the quaterly billisi to adjust variations on account of any revision in transmission charges allowed by the Commission
3.3. The third bill shall be raised in each billing month for Transmission Deviation charges, along with the first bill.
[clause 15]
2. The bills for transmission charges for the DICs shall be raised by the CTU for following three categories:
3.1. The first bill of each billing month shall contain the transmission charges for the billing period
3.2. The second bill shall be raised the quaterly billisi to adjust variations on account of any revision in transmission charges allowed by the Commission
3.3. The third bill shall be raised in each billing month for Transmission Deviation charges, along with the first bill.
[clause 15]
Corrigendum/ Amendment, if any
No
Sharing of Inter-State Transmission Charges and Losses Regulations, 2020 (1st Amendment)
Resolution By
CERC
Notification No. and date
L-1/250/2019/CERC dated 07.02.2023
Objectives
No Amendment
Regulations called as
Central Electricity Regulatory Commission (Sharing of Inter-State Transmission Charges and Losses) (First Amendment) Regulations, 2023
Effective Control period
These regulations shall come into effect from the date as notified by the Commission.
Principles of sharing transmission charges
" 1. The words “amongst the DICs” after the words “shall be shared” shall be deleted in Clause (1) of Regulation 3 of the Principal Regulations.
2. The word “drawee” shall be added before the words “DICs” in Clause (2) of Regulation 3 of the Principal Regulations
3. Clause (3) of the Regulation 3 of the Principal Regulations shall be substituted as under:
“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 necessary, shall be made in terms of the PPA or as per the mutual agreement between the concerned parties.”
4. The yearly transmission charges shall be shared by the drawee DIC's of the receiving region in proportion to their quantum of GNA and GNA(RE).
[Regulation 5]"
2. The word “drawee” shall be added before the words “DICs” in Clause (2) of Regulation 3 of the Principal Regulations
3. Clause (3) of the Regulation 3 of the Principal Regulations shall be substituted as under:
“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 necessary, shall be made in terms of the PPA or as per the mutual agreement between the concerned parties.”
4. The yearly transmission charges shall be shared by the drawee DIC's of the receiving region in proportion to their quantum of GNA and GNA(RE).
[Regulation 5]"
Processes of sharing transmission charges and losses
"1. The words “along with their associated bays and downstream bays” shall be added before the words “planned for drawal” in Clause (1) of Regulation 7 of the Principal Regulations.
2. ) The words “Long Term Access plus Medium Term Open Access” shall be substituted with the word “GNA and GNA-RE” in Clause (2) of Regulation 7 of the Principal Regulations.
[Regulation 7]"
2. ) The words “Long Term Access plus Medium Term Open Access” shall be substituted with the word “GNA and GNA-RE” in Clause (2) of Regulation 7 of the Principal Regulations.
[Regulation 7]"
Specific transmission charges applicable for a Designated ISTS Customer
"1. The words “and injecting DICs with untied LTA” after the words “drawee DICs” shall be deleted in Clause (3) of Regulation 8 of the Principal Regulations.
2. Transmission charges under AC-BC shall be shared by all drawee DICs in proportion to their quantum of GNA and GNA-RE.
[Regulation 8]
3. The waiver if transmission charges for the users shall be applicable for scheduling the power from:
a) REGS or RHGS based on wind or solar.
b) ESS sourcd from REGS or RHGS.
c) Hydro.
[Regulation 13]"
2. Transmission charges under AC-BC shall be shared by all drawee DICs in proportion to their quantum of GNA and GNA-RE.
[Regulation 8]
3. The waiver if transmission charges for the users shall be applicable for scheduling the power from:
a) REGS or RHGS based on wind or solar.
b) ESS sourcd from REGS or RHGS.
c) Hydro.
[Regulation 13]"
Accounting of charges
"1. The words “and injecting DICs with united LTA” in Clause (1) of Regulation 14 of the Principal Regulations shall be deleted.
[Regulation 14]"
[Regulation 14]"
Billing
"1. The main heading of Regulation 11 of the Principal Regulations shall be substituted as “Transmission charges for T-GNA and T-GNA-RE.
2. Clause (1) to (6) of Regulation 11 of the Principal Regulations shall be substituted by Clause (1) to (3) as under:
“(1) T-GNA Rate (in Rs./MW/block) shall be published for each billing month by the Implementing Agency on its website and shall be calculated State-wise.
“(2) Transmission charges shall be payable by the entities granted T-GNA and T-GNA- RE under regulation 26.1 of the GNA regulation 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-GNA-RE 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 after adjustment of such charges as per sub-clause (d) of Clause (2) of Annexure-III to these regulations.”
[Regulation 11]"
2. Clause (1) to (6) of Regulation 11 of the Principal Regulations shall be substituted by Clause (1) to (3) as under:
“(1) T-GNA Rate (in Rs./MW/block) shall be published for each billing month by the Implementing Agency on its website and shall be calculated State-wise.
“(2) Transmission charges shall be payable by the entities granted T-GNA and T-GNA- RE under regulation 26.1 of the GNA regulation 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-GNA-RE 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 after adjustment of such charges as per sub-clause (d) of Clause (2) of Annexure-III to these regulations.”
[Regulation 11]"
Transmission Service Agreement (TSA)
"1. If COD of a Connectivity grantee other than Renewable Power Park developer is delayed from start date of Connectivity in terms of GNA Regulations, and the Associated Transmission System has achieved COD, which is not earlier than such start date of Connectivity, the Connectivity grantee shall pay Yearly Transmission Charges for the Associated Transmission System corresponding to Connectivity capacity which have not achieved COD.
[Clause 3 of Regulation 13]
2. If Connectivity is granted to a Connectivity grantee other than Renewable Power Park Developer, on margins of existing system or on the augmented system with no ATS, and if the COD of such grantee is delayed beyond start date of connectivity, the Connectivity grantee shall, corresponding to the capacity that is delayed, pay transmission charges from the start date of such Connectivity at the rate of Rs. 3000/MW/month:
Provided that where a Connectivity grantee is Renewable Power Park Developer and the generation capacity within the Renewable Power Park has not declared COD on or before start date of Connectivity in terms of GNA Regulations, the Renewable Power Park Developer shall pay transmission charges from the start date of such Connectivity at the rate of Rs. 3000/MW/month corresponding to generation capacity which have not achieved COD.
[Clause 7 of Regulation 13]
3. The words “Long Term Access” shall be substituted by the word “Connectivity” in Clause (8) of Regulation 13 of the Principal Regulations [Regulation 13]"
[Clause 3 of Regulation 13]
2. If Connectivity is granted to a Connectivity grantee other than Renewable Power Park Developer, on margins of existing system or on the augmented system with no ATS, and if the COD of such grantee is delayed beyond start date of connectivity, the Connectivity grantee shall, corresponding to the capacity that is delayed, pay transmission charges from the start date of such Connectivity at the rate of Rs. 3000/MW/month:
Provided that where a Connectivity grantee is Renewable Power Park Developer and the generation capacity within the Renewable Power Park has not declared COD on or before start date of Connectivity in terms of GNA Regulations, the Renewable Power Park Developer shall pay transmission charges from the start date of such Connectivity at the rate of Rs. 3000/MW/month corresponding to generation capacity which have not achieved COD.
[Clause 7 of Regulation 13]
3. The words “Long Term Access” shall be substituted by the word “Connectivity” in Clause (8) of Regulation 13 of the Principal Regulations [Regulation 13]"
Sharing of Inter-State Transmission Charges and Losses Regulations, 2020 (2nd Amendment)
Resolution By
CERC
Notification No. and date
L-1/250/2019/CERC dated 20 October 2023
Objectives
No Amendment
Regulations called as
Central Electricity Regulatory Commission (Sharing of Inter-State Transmission Charges and Losses) (Second Amendment) Regulations, 2023
Effective Control period
These regulations shall come into effect from 1.11.2023
Billing
"The words “after adjustment of such charges as per sub-clause (d) of Clause (2) of Annexure-III to these regulations” in Clause (3) of Regulation 11 of the Principal Regulations, shall be substituted with words “after adjustment of such charges as per sub-clause (d) of Clause (2) of Annexure-III followed by adjustment as per sub-clause (c) of Clause (12) of Regulation 13 of these regulations”."
Transmission Service Agreement (TSA)
"1. The words “is delayed” in the main provision of Clause (3) of Regulation 13 of the Principal Regulations shall be substituted with the words “has not been achieved”.
2. In case an inter-State transmission licensee is responsible for the delay in the commencement of power flow in the inter-State transmission system of another inter-State transmission licensee which has achieved deemed COD, inter-State transmission licensee of the delayed inter-State transmission system shall pay 50% of YTC of its transmission system or 50% of YTC of the transmission system which has achieved deemed COD, whichever is lower, till its delayed inter-State transmission system achieves COD.
[Clause 12(e) of Regulation 13]
3. In case an intra-State transmission licensee is responsible for the delay in commencement of power flow in the inter-State transmission system which has achieved deemed COD, such intra-State transmission licensee of the delayed intra-State transmission system shall pay 50% of YTC of the delayed intra-State transmission system or 50% of YTC of the inter-State transmission system which has achieved deemed COD (excluding transmission elements covered under sub-clause (d) of this Clause), whichever is lower, till the delayed intra-State transmission system achieves COD.
[Clause 12(f) of Regulation 13]"
2. In case an inter-State transmission licensee is responsible for the delay in the commencement of power flow in the inter-State transmission system of another inter-State transmission licensee which has achieved deemed COD, inter-State transmission licensee of the delayed inter-State transmission system shall pay 50% of YTC of its transmission system or 50% of YTC of the transmission system which has achieved deemed COD, whichever is lower, till its delayed inter-State transmission system achieves COD.
[Clause 12(e) of Regulation 13]
3. In case an intra-State transmission licensee is responsible for the delay in commencement of power flow in the inter-State transmission system which has achieved deemed COD, such intra-State transmission licensee of the delayed intra-State transmission system shall pay 50% of YTC of the delayed intra-State transmission system or 50% of YTC of the inter-State transmission system which has achieved deemed COD (excluding transmission elements covered under sub-clause (d) of this Clause), whichever is lower, till the delayed intra-State transmission system achieves COD.
[Clause 12(f) of Regulation 13]"
Applicability
No Amendment
Principles of sharing transmission charges
No Amendment
Processes of sharing transmission charges and losses
No Amendment
Specific transmission charges applicable for a Designated ISTS Customer
No Amendment
Sharing of Transmission Losses
No Amendment
Accounting of charges
No Amendment
Sharing of Inter-State Transmission Charges and Losses Regulations, 2020 (3rd Amendment)
Resolution By
CERC
Notification No. and date
L-1/250/2019/CERC dated 26 October 2023
Objectives
No Amendment
Regulations called as
Central Electricity Regulatory Commission (Sharing of Inter-State Transmission Charges and Losses) (Third Amendment) Regulations, 2023
Effective Control period
Date of publishing in Gazette
Processes of sharing transmission charges and losses
"The following proviso shall be inserted in sub-clause (D) of clause (3) of regulation 5 of the principal Regulations:
“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 National component shall be 30% or more in accordance with sub-clause (a) of Clause (1) of Regulation 6 of these regulations.”
3. Sub-clause (a) of clause (1) of regulation 6 of the principal regulations shall be substituted as follows:
“(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) X 100
Where, HVDCr (in %) is more than 30%, the Yearly Transmission Charges corresponding to HVDCr shall be considered in the National component and the balance in the regional component.
Where, HVDCr (in %) is equal to or less than 30%, 30% of Yearly Transmission Charges shall be considered in the National component and 70% in the Regional component:
Provided further that the MW capacity of power flow in reverse direction shall be certified by NLDC by way of actual power flow equal to such capacity"
“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 National component shall be 30% or more in accordance with sub-clause (a) of Clause (1) of Regulation 6 of these regulations.”
3. Sub-clause (a) of clause (1) of regulation 6 of the principal regulations shall be substituted as follows:
“(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) X 100
Where, HVDCr (in %) is more than 30%, the Yearly Transmission Charges corresponding to HVDCr shall be considered in the National component and the balance in the regional component.
Where, HVDCr (in %) is equal to or less than 30%, 30% of Yearly Transmission Charges shall be considered in the National component and 70% in the Regional component:
Provided further that the MW capacity of power flow in reverse direction shall be certified by NLDC by way of actual power flow equal to such capacity"