Jurisdiction(s):
United Kingdom

Related legal acts

Key definition

Capacity Market definition

What does Capacity Market mean? In practice, a capacity market is the framework under which generators, battery storage and demand‑side response are paid to be available at times of system stress, to support security of electricity supply and underpin investment and plant retention. In Great Britain, the Capacity Market is established by the Energy Act 2013 and detailed regulations and rules. National Grid ESO (as EMR Delivery Body) runs T‑4 and T‑1 capacity auctions. Successful bidders enter capacity agreements with availability payments and performance penalties for non‑delivery; agreement lengths vary (typically one year for existing plant and up to 15 years for new...

Great Britain Capacity Market: Legal and Regulatory Tracker of Rules, Regulations, Consultations, Auctions and Guidance (2015–2026)

Published by a LexisNexis Energy expert

Practice notes

Capacity Market (Cm)

The Capacity Market (CM) exists to secure adequate Investment in dependable capacity across the electricity system so that supplies remain reliable and secure. It operates by paying capacity providers a regular retainer in exchange for a clear commitment to deliver capacity when the system is under strain, acting as an explicit hedge against potential black outs in future. For a summary of the CM’s principal features and operation, see Practice Note: Capacity Market—key features. The CM is one of the principal tools used by government to deliver electricity market reform (EMR) (see Practice Note: Electricity Market Reform (EMR)). The other central instrument introduced via EMR is the Contracts for Difference revenue support framework for low carbon generation projects, see Practice Note: Contracts for Difference (CfD)—key features for further details. This CM tracker presents, in reverse chronological order (ie most recent first), key developments concerning the CM since February 2015, including all consultations, regulatory guidance publications and significant amendments to CM legislation and the Capacity Market Rules, as they have been issued recently...

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Web page updated on 21/05/2026

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