Great Britain’s electricity grid operator issued alerts regarding potential power supply constraints expected for Wednesday evening, coinciding with a near-total solar eclipse that could obscure up to 95% of the sun across parts of the country. The eclipse represents the most dramatic such event visible in Great Britain since 1999.
The National Energy System Operator initially warned of a potential shortfall exceeding 1,700 megawatts of electricity generation compared to peak evening demand, equivalent to the capacity of a solar farm spanning approximately 8,500 football pitches. A second notice issued the following morning reduced that estimate to approximately 1,200 megawatts. The grid operator later cancelled the alert. The shortfall stems from the eclipse simultaneously eliminating between 300 and 1,100 megawatts of solar power generation while demand for electricity surges due to the fifth heatwave of the season, driving consumption for air conditioning, fans, and refrigeration systems.
To address the anticipated supply constraint, the grid operator secured backup electricity at substantially elevated costs. The Connah’s Quay gas plant in Flintshire agreed to generate power at £875 per megawatt-hour, representing approximately four times the prevailing market price of just below £212 per megawatt-hour. Grid data indicates requests for imported electricity via interconnections to continental Europe totalling 1,200 megawatts for one hour beginning in the afternoon, increasing to 2,550 megawatts between 5pm and 6pm, and returning to 1,200 megawatts in the evening.
Margin notices such as these remain relatively uncommon during summer months, with this representing the first instance of supply warnings issued during the season due to persistent heatwaves. Energy analysts attribute the squeeze partly to broader climate patterns and existing infrastructure challenges, including reduced nuclear capacity across Europe due to low river water levels affecting cooling systems, maintenance season approaches for gas plants, and transmission line constraints from elevated temperatures. Britain’s largest household electricity supplier has requested customers defer operating washing machines and dishwashers between 6pm and 8pm on Wednesday to reduce demand.
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