(1) This article applies for the purpose of determining the price (the "carbon price") per tonne of carbon dioxide equivalent for a scheme year.

(2) The carbon price for the 2021 scheme year is the sum of the relevant amount for each auction of allowances held in the period beginning on 1st January 2021 and ending on 11th November 2021 under regulations made by the Treasury under the Finance Act 2020 divided by the sum of the allowances sold at all those auctions.

(3) In paragraph (2), the relevant amount for an auction is the auction clearing price (that is to say, the price per allowance that, in accordance with the auction rules, each successful bidder must pay, irrespective of the original bid) multiplied by the number of allowances sold at the auction.

(4) The carbon price for the 2022 scheme year or any subsequent scheme year (the "relevant scheme year") is the average end of day settlement price, calculated over the relevant period, of the December futures contract for the relevant scheme year, as traded on the relevant carbon market exchange.