On 7 July 2026, UK shadow energy secretary Claire Coutinho told Parliament that a whistleblower within NESO alleged senior managers ordered control room operators to hide information indicating insecure grid operation and that corporate affairs interfered with operational decisions to protect NESO’s reputation. NESO stated all operational decisions are taken by authorised personnel within established procedures and it does not instruct employees to avoid retaining records. The allegations follow recent tight electricity margins that prompted NESO to issue Electricity Margin Notices during high temperatures and low wind generation.