North Hyde Review
The National Energy System Operator (NESO) publishes its interim findings from the review into the North Hyde Substation outage which took place on 20 March and led to over 60,000 customers and businesses losing power and the closure of Heathrow Airport.
NESO was commissioned by the Department for Energy Security and Net Zero (DESNZ) and Ofgem to conduct a review into the outage, with an initial report submitted to the Secretary of State and Ofgem within six weeks. NESO will provide a final report to the Secretary of State and Ofgem by the end of June 2025, including recommendations and lessons for the future.
The interim findings published today are an initial assessment of the evidence we have gathered so far. This includes establishing a timeline and sequence of events of the outage, explaining the roles and responsibilities of the key stakeholders involved, and outlines further investigation required to deliver the final report by the end of June 2025. Information contained within the interim report may be refined or subject to change as the review progresses and further evidence comes to light.