Schedule 25B, paragraph 3

The “relevant date” in relation to a generator means— 1st January 2019, in the case of a Tranche B generator; 1st October 2019, in the case of a Tranche A generator with a rated thermal input greater than 5 megawatts which— has an emission of nitrogen oxides of equal to or greater than 500mg/Nm3, and operates for more than 50 hours per year; 1st January 2025, in the case of a Tranche A generator with a rated thermal input greater than 5 megawatts which— has an emission of nitrogen oxides of less than 500mg/Nm3, or operates for less than or equal to 50 hours per year; 1st January 2030, in the case of a Tranche A generator with a rated thermal input equal to or less than 5 megawatts. The “permitting date”— in relation to a specified generator falling within paragraph 2(1)(a), is the relevant date in relation to that specified generator; in relation to a specified generator falling within paragraph 2(1)(b) or (c), is the earliest of the relevant dates in relation to the generators comprising that specified generator. For the purposes of sub-paragraph (1)— “Tranche A generator” means a generator— provided that a generator ceases to be a Tranche A generator if it is the subject of a capacity agreement, or an agreement for provision of balancing services, where that agreement is entered into after 31st October 2017 and remains in force after 31st December 2018; with a rated thermal input equal to or greater than 1 megawatt and less than 50 megawatts— which came into operation before 1st December 2016, which is the subject of a capacity agreement arising from the 2014 or 2015 capacity auctions (whether or not the generator came into operation before 1st December 2016), or for which a Feed-in Tariff preliminary accreditation application was received by the Gas and Electricity Markets Authority before 1st December 2016; with a rated thermal input of less than 1 megawatt— which is the subject of a capacity agreement arising from the 2014, 2015 or 2016 capacity auctions (whether or not the generator came into operation before 1st December 2016), for which a Feed-in Tariff preliminary accreditation application was received by the Gas and Electricity Markets Authority before 1st December 2017; or which is the subject of an agreement to provide balancing services entered into before 31st October 2017, “Tranche B generator” means any generator which is not a Tranche A generator or an excluded generator (and includes a specified generator which has ceased to be a Tranche A generator). For the purposes of sub-paragraph (1), in the case of a generator which is comprised in a specified generator falling within paragraph 2(1)(b) or (c), the generator is deemed to have the total rated thermal input of all the generators comprised in the specified generator.

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Source: legislation.gov.uk · retrieved 2026-07-30