On that baking Tuesday, June 23rd, we came close to suffering an event as dramatic as the blackout that occurred in Spain and Portugal in 2025 when trains stopped, industry and commerce were suspended, and hospitals were forced to switch to emergency backup supplies to prevent patients from dying.
Control room engineers at the National Energy System Operator (Neso) the little-known government body responsible for balancing Britain's electricity supply and demand, were panicking. The grid's frequency had destabilised and dropped below Neso's strict operating limit, threatening widespread blackouts.
As Britain moves towards a carbon-free electricity system, around 80 per cent of generation is expected to come from wind and solar. The greater the share supplied by weather-dependent sources, the smaller the proportion of the system that grid operators can directly control when balancing supply and demand.
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