Great Britain’s National Energy System Operator (Neso) has engaged an external legal firm to investigate claims that staff members were discouraged from documenting decisions related to power grid stabilization efforts during an intense heat event in late June. The allegations emerged after a whistleblower contacted Conservative shadow minister Claire Couthing, who raised the matter in parliament.
According to the whistleblower’s account, senior management at Neso instructed control room staff to avoid creating audit trails or permanent records of key operational decisions. The allegations also suggest that the organization’s corporate affairs team attempted to pressure operators to make certain decisions primarily to protect Neso’s institutional reputation rather than based on grid management priorities. Couthing emphasized that whistleblowers have contacted her due to concerns about the grid’s manageability and lack of confidence in internal processes for addressing these issues.
During the heatwave period, the power system experienced conditions that tested operational stability. Industry data shows that grid frequency fell below normal operational thresholds as high temperatures reduced renewable energy generation capacity and caused unplanned outages at gas facilities, while simultaneous demand for electricity surged from cooling systems. The grid’s frequency dipped to 49.66Hz during the period from 17:30 to 18:30 on 23 June, falling beneath Neso’s operational limits of 49.8Hz to 50.2Hz, though remaining above the statutory regulatory minimum of 49.5Hz.
Neso has stated that the grid operated securely throughout the period and that frequency and voltage remained within required statutory parameters. The system operator was compelled to issue emergency alerts twice in late June due to heatwave impacts. Craig Dyke, a Neso director, confirmed that a comprehensive operational review would be conducted alongside the independent investigation. Both reports are expected to be made public.
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