Amidst one of the worst heatwaves in European history, Britain’s national grid saw itself faced with a quiet crisis this summer. On June 23rd, the grid frequency dropped to 49.657 …. How Britain Narrowly Escaped a Grid Blackout in June 2026.
On June 23rd, the grid frequency dropped to 49.657 Hz, down from the nominal 50 Hz — getting very close to the lower bound before safeties would start disconnecting parts of the grid. In a video by [The Electric Brit] this event is investigated, including its causes and how France’s spare capacity managed to save the day. Under normal operating conditions the UK grid is kept above 49.8 Hz, with the statutory lower limit being 49.5.
Meaning that another drop of 0.157 Hz would have set in motion a series of quite extreme grid protection mechanisms including the possibility of local blackouts. Fortunately the cessation of energy exports and the importing of French power from hydro and nuclear power stations managed to nip this issue in the bud before it could get any worse. Although an example of correct grid management, it also shows how poorly planned maintenance and events like a heatwave can line up quite a few holes in the cheese slices that invite disaster.
The problems here began weeks before the event, with 21.2 GW of generating capacity offline.
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