Ofgem outlined the next phase of its electricity-system review on October 19 after receiving the National Energy System Operator’s preliminary account of events during the week beginning June 22. The new development is the review update, not a claim that the summer heat events occurred this week.

The regulator will examine system security, operational planning and decisions, electricity flows through interconnectors, demand forecasts, generation availability and balancing services. Ofgem says it has not yet reached conclusions or regulatory judgments about the events described in the preliminary report.

It plans to publish conclusions on whether Great Britain’s system remained secure and maintained required standards by January 31, 2027, at the latest. A lessons-learned assessment with an action plan is due by March 31. Enforcement investigations would be considered if the inquiry identifies a material reason to suspect a license breach; no new penalty was announced.

A separate Eversheds Sutherland investigation concerns whistleblowing allegations about operational decisions and record-keeping. Ofgem says relevant evidence from that work will inform its review, but the two inquiries are distinct. The statement does not establish a current power-supply emergency.