Which commencement date should I cite? 14 May 2019 (Gazette No. 160). Regulation 1(2) provides that these regulations come into force from the date of Gazette publication — not the 8 March 2019 notification date, which is when CERC signed them.

What's the difference between the First and Second Amendments? The First Amendment (2023) is narrow — it only introduced the SNA Charge. The Second Amendment (2025) is a near-total rewrite: it replaces the legacy LTA/MTOA/STOA access terminology with GNA/T-GNA and widens the Applicant definition, touching roughly 20 of the regulation's 37 operative clauses.

What is the SNA Charge? 0.50 paisa (half paisa) per kWh on the energy scheduled, payable by participating entities located in the neighbouring countries to the Settlement Nodal Agency (Regulation 30(2), introduced by the First Amendment, 2023).

What is the CTU "Due Date"? The 45th day from presentation of the bill raised by the Central Transmission Utility. It's a term that didn't exist in the original 2019 text — it was newly defined by the 2025 Second Amendment (Regulation 2(x-i)).

Is market coupling live yet? No. It remains in a shadow-pilot/simulation phase run by Grid India. The Draft Second Amendment, 2026 would make Grid India the sole permanent Market Coupling Operator, but it has not been notified.

What did the Supreme Court decide on 3 August 2026? It dismissed a legal challenge to market coupling brought by IEX as premature, without ruling on the merits. CERC told the Court notification of the Second Amendment was 4–6 weeks away — a window that has since passed with no Sl. No. yet assigned.

Which commencement date should I cite for PMR 2021? 15 August 2021 (Gazette No. 327). The regulation was notified 15 February 2021 and published in the Gazette on 16 June 2021 (No. 241), but it came into force on 15 August 2021.

What's the fee cap for exchanges and facilitators? Both the transaction fee and the Facilitator service charge are capped at 2 paise/kWh (Regs. 23–24).

What are Tariff Regulations? The primary regulations for determination of tariff of Thermal Stations, Hydro Stations, Transmission Systems and Integrated Mines owned/controlled by Govt. companies, under Section 62 read with Section 79 of the Electricity Act.

What is the control period? Five years, except the first (3 years). Currently in the 6th control period, 2024–29. Earlier periods: 2019–24, 2014–19, 2009–14, 2004–09, 2001–04.

Where did DSM come from? Originally Unscheduled Interchange Charges, folded into Tariff Regulations (2004–09, 2009–14). Split into standalone DSM Regulations in 2014, with a major structural update in November 2015 for renewable generators.

Why so many effective dates? The 2024 regulation was rolled out in stages: most provisions took effect 16.09.2024, Regulation 8(8) (deficit recovery from the Deviation & Ancillary Service Pool) followed on 01.12.2024 and then 23.12.2024 once the Detailed Procedure was approved (15.10.2024). The First Amendment (Dec 2024) and Second Amendment (notified 25.06.2025, gazetted 02.07.2025) followed, the latter letting thermal generators recover infirm power at the Normal Rate of Charges for Deviations, capped at ₹2.86/kWh. Most recently, a Commission order dated 31.03.2026 fixed the deviation-computation value “X” for Wind & Solar sellers from 01.04.2026.

What changed in the Second and Third Amendments? The Second Amendment (notified 25.06.2025, gazetted 02.07.2025, effective 01.07.2025) let thermal generating stations recover infirm power — from first synchronisation to successful trial-run completion — at the Normal Rate of Charges for Deviations, capped at ₹2.86/kWh (Regulation 8(8)). The Third Amendment (notified 25.08.2026, effective 31.08.2026) made four further changes: a WS/General-Seller parity rule under which a Wind & Solar Seller is treated as a General Seller for deviation if its project is bid/tendered on or after 01.01.2027, or (for non-bid projects) commissioned on or after 01.01.2029 (new Clause 4A, Regulation 8); a dedicated deviation rate for standalone Pumped Hydro Storage Projects, set at the energy charge rate under Regulation 66(3) of the CERC Tariff Regulations, 2024, in place of a contract rate; infirm-power compensation for standalone Energy Storage Systems, at the Normal Rate capped at ₹2.00/kWh (new Clause 2A, Regulation 8); and payment-timeline flexibility under Regulation 10, letting a Commission-approved Detailed Procedure set an alternative to the default 10-day payment window.

Is this still in force? No — superseded by the DSM Regulations, 2024 (Sl.no.192) above. Kept here as an archive since several 2022-era CERC orders still reference it.

What is ancillary services in power generation? Functions that help grid operators maintain a reliable system — managing the flow and direction of electricity, addressing supply-demand imbalances, and helping the grid recover after an event.

What types are covered, and when did each take effect? Primary (PRAS) and Secondary (SRAS) reserve ancillary services took effect 05.12.2022; Tertiary (TRAS) followed on 01.04.2023 once its Detailed Procedure was finalised. Other services such as voltage control and black start are specified separately in the Grid Code.

What changed from the 2010 regulations? CERC notified these on 09.05.2022 in supersession of the 2010 REC Regulations, removing the forbearance and floor price ceiling that previously capped and floored REC prices.

What changed in the First Amendment, 2026? It recognises Virtual Power Purchase Agreements for the first time (new Regulation 14A), widens which self-consumption plants qualify as captive, shifts the REC application deadline for obligated entities to the State Commission's certification date, and replaces the old tariff-only Certificate Multiplier with a 3-factor weighted score — raising the multiplier for offshore wind (4.0x) and storage/firm technologies (3.0x).

What does the 2026 Amendment actually change? It rewrites Regulation 4(1)(b) so all Advanced Metering Infrastructure must include prepayment functionality and be interoperable, and lets a Smart Meter of accuracy class 1.0/0.5S double as the Interface Meter for open-access consumers at or below 650 V. It also splits Regulation 7's Table-1 (Sl. No. 4 & 5) cleanly at the 650 V threshold for Main/Check Meter placement.

Is the 10 April 2026 Corrigendum a substantive change? No — it's a Hindi-text translation fix and an English typo correction (“pentries” → “entries”) only. The 1 April 2026 operative rules are unchanged in substance.

Who does this regulation apply to? Generating companies, captive generating plants & Energy Storage Systems with installed capacity ≥ 50 MW, transmission & distribution licensees, National/Regional/State Load Despatch Centres, and power exchanges/OTC platforms (except Regulations 6, 11 & 12) that own, operate or manage OT infrastructure tied to the interconnected power system, plus their connected IT infrastructure. Entities below 50 MW are encouraged, not mandated, to adopt CERT-In's "15 Elemental Cyber Defense Controls for MSMEs" as a minimum baseline.

What are the key compliance timelines? Cyber security incidents must be reported to CSIRT-Power and CERT-In within 6 hours (24 hours for confirmed cyber sabotage of critical systems). Cyber security audits must be completed within 6 weeks of commencement, with critical/high-risk findings fixed within 1 month and medium/low-risk findings within 3 months. The regulations come into force from 1 April 2027, though select sub-regulations (5(9), 5(24), 5(33), 5(39), 6(2), 6(7)) commence on dates to be separately notified.

Who does this regulation apply to? All coal-based thermal power generating units connected to the grid — whether owned or controlled by the Central Government, State Governments, or any private company — and the load despatch centres responsible for scheduling them, covering both existing and new units.

What are the key compliance timelines? Units must achieve a minimum power level of 40% of Maximum Continuous Rating (MCR) without oil support, with units not yet compliant required to reach an interim 55% MCR within one year of notification (30 January 2023). Ramp rates must reach at least 3%/min between 70–100% MCR, 2%/min between 55–70% MCR, and 1%/min between 40–55% MCR (phased), with the Authority prescribing unit-wise implementation timelines and case-by-case relaxations by reasoned order.

Who does this regulation apply to? Generating companies, transmission & distribution licensees, CTU and STUs building or operating electrical plants, sub-stations, switchyards and electric lines (2022 base). From the 2026 amendment, the same technical-standards discipline extends to solar (including floating solar), onshore & offshore wind, and BESS developers — covering Parts A, A1, B, B1 and C of the new Chapter VI.

What changed across the three notifications? The 2022 base regulation lays down chapter-wise standards for General, Thermal, Hydro-Electric, Sub-stations & Switchyards, Electric Lines and HVDC works. The 2025 amendment substitutes Schedule VII with Right-of-Way values keyed to voltage class, conductor, terrain and approach-section — any new conductor configuration or technology needs separate CEA approval. The 2026 amendment inserts Regulations 106A–106ZS, mandating ≥25-year design life, AWS & PMU integration, and use-case-specific technical requirements for RE and BESS assets (including AGC, grid-forming inverters and black-start capability for BESS ≥50 MW), coming into force 1 April 2027.