Britain’s electricity system operator has gained new authority to implement rotating power cuts across the country with minimal advance warning, according to rule changes that took effect this week. Under the revised grid codes approved by the industry regulator last month, the system operator can disconnect homes and businesses in designated areas with only eight hours’ notice, reducing electricity consumption by more than a fifth in each block to avert potential system-wide collapse.
The National Energy System Operator characterized the measure as a last-resort contingency to be deployed only after all alternative options have been exhausted. The measure represents the first time the system operator can execute large-scale power cuts to stabilize the grid without requiring emergency government powers. Planned blackouts would rotate across the country in three-hour intervals to limit cumulative effects on individual households and businesses while system operators manage short-term supply constraints.
The new protocol fills a gap between the system operator’s existing limited powers, unused since the 1970s, and the government’s broader emergency code designed for prolonged disruptions. The government’s electricity supply emergency code, which has never been invoked, can only be activated by the energy secretary and would affect 90 percent of electricity users but is designed for longer-duration outages rather than rapid-onset supply squeezes. Ofgem determined that the government’s approach is unsuitable for short-notice deployment, making the new system operator authority necessary for managing unpredictable short-term imbalances.
Certain facilities designated as critical infrastructure, including hospitals, water treatment facilities, and national security sites, would be exempt from any planned power cuts. The measure joins other existing tools available to the system operator, such as disconnecting major industrial users and reducing voltage across regional grids, to manage electricity shortages and prevent uncontrolled system collapse.
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