Enabling the use of Market-Wide Half-Hourly Settlement Systems in the Capacity Market

Details of outcome

This document sets out our decision on changes to the Capacity Market Rules (the “Rules”) pursuant to Regulation 77 of the Electricity Capacity Regulations 2014 (the “Regulations”). This decision follows our Statutory Consultation on Capacity Market Rules change proposal CP391 issued on 14 January 2026.  
 
These Rule changes will come into effect when laid before Parliament, ahead of the 2026 Prequalification Window. Appendix 1 sets out our changes to the Rules. 

Read the full outcome

Original consultation

Consultation description

This consultation is for a proposal to update definitions in the Capacity Market Rules so that they reflect recent changes made by the Market-Wide Half-Hourly Settlement Programme. This will ensure that Capacity Providers using these provisions can still meet the requirements set out in the Capacity Market Rules and participate in the Capacity Market.

Who should respond

We would like views from people with an interest in the Capacity Market, particularly Capacity Market participants. We would also welcome responses from other stakeholders and the public.