Changes to grid regulations that entered effect this week grant the National Energy System Operator (Neso) expanded authority to initiate controlled power cuts during acute supply shortages. The modifications to the grid codes were approved by industry regulators late last month and represent the first instance in which the system operator can implement large-scale blackouts without requiring formal government emergency powers.
Under the new framework, Neso could disconnect enough households and businesses within designated areas to reduce electricity consumption by more than one-fifth, with residents receiving only eight hours’ advance notice. These rolling blackouts would last approximately three hours each and rotate across different regions to distribute impact. The measure is designed to function as a last-resort contingency to prevent complete system collapse, which could otherwise require five to seven days for full electricity restoration, comparable to events experienced in Spain and Portugal in previous years.
Neso characterized the power cuts as an “extreme and unlikely” measure to be deployed solely after all alternative options have been exhausted. Certain facilities including hospitals, water treatment works, and national security sites would remain exempt from planned outages. The new rules fill a gap between existing short-term power reduction capabilities—last invoked during the miners’ strikes in the 1970s—and the government’s broader emergency code, which has never been activated and would require the energy secretary’s authorization.
The regulatory change reflects mounting concerns about short-term power system imbalances that are harder to predict in advance compared to large-scale, prolonged outages. Other mitigation tools available to the system operator include disconnecting major industrial consumers and reducing regional grid voltages. The approval followed allegations from whistleblowers at Neso’s control room regarding potential suppression of blackout risk communications during recent high-temperature weather events.
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