Great Britain’s electricity grid operator is preparing for a significant power supply challenge as a near-total solar eclipse is forecast to occur Wednesday evening. The eclipse is expected to block up to 95% of the sun over parts of the country, marking the most dramatic solar eclipse visible in Great Britain since 1999.
The loss of solar power generation during the eclipse—estimated between 300 and 1,100 megawatts—comes as the country experiences its fifth heatwave of the summer, driving elevated electricity demand for cooling systems. The National Energy System Operator initially projected a shortfall exceeding 1,700 megawatts compared to peak evening demand, equivalent to the capacity of a solar farm covering 8,500 football pitches. A second assessment later revised this figure to approximately 1,200 megawatts.
To address the anticipated supply gap, the grid operator issued market notices requesting additional generating capacity, prompting gas plants to offer electricity at substantially elevated rates. The Connah’s Quay gas plant in Flintshire agreed to supply power at £875 per megawatt-hour, roughly four times the standard market price of £212 per megawatt-hour. The grid operator later cancelled the initial alarm after securing commitments for imported electricity via high voltage cables from continental Europe.
The supply warnings represent an unusual occurrence for summer months, as margin notices are typically issued during winter when heating demand peaks. Energy analysts attribute the summer squeeze to persistent heatwaves intensified by climate factors, compounded by broader European energy challenges including reduced nuclear capacity offline due to low river water levels and maintenance scheduling at gas facilities.
Britain’s largest household electricity supplier, Octopus Energy, issued guidance recommending customers avoid operating washing machines and dishwashers between 6pm and 8pm Wednesday to help manage demand during the critical period.
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