Ofgem opens consultation on Sizewell C regulatory framework

Ofgem launched a statutory consultation on 16 July 2026 proposing modifications to the Sizewell C regulatory framework. The regulator is specifically targeting revenue-setting mechanics and financial administration. Both are central to how a Regulated Asset Base structure translates construction costs into allowed returns for investors.

The consultation follows the project's progression through the UK government's nuclear financing framework. Modifications at this stage typically address how periodic revenue is determined and what financial ring-fencing or administration procedures apply if the project encounters stress. No draft numbers or revenue floors have been published in the consultation notice itself.

Also active this week: Ofgem is finalising its ranking methodology for the LDES Cap & Floor scheme, and EEX separately issued a revised auction calendar for 2026 EUA lots. All three items signal a busy regulatory pipeline across both GB and EU markets heading into Q3.