Octopus Energy, Great Britain’s biggest household energy supplier, has appealed to millions of customers to decrease electricity consumption this week during a significant solar eclipse expected to block up to 95% of the sun over parts of Britain. The supplier specifically requested that customers avoid operating washing machines and dishwashers between 6pm and 8pm on Wednesday, when the eclipse will occur.
The eclipse presents a particular challenge to the nation’s power system because solar energy generation is expected to drop sharply at the precise moment when electricity demand typically peaks in the early evening. This timing coincides with the country’s fifth heatwave of the year, which is driving increased electricity consumption for air conditioning, fans, and refrigeration. In recognition of their participation, Octopus will provide participating customers with a free hour of electricity to use the following weekend through its rewards programme for those enrolled in “saving sessions.”
The company estimates that British households possess approximately 13 gigawatts of flexible electricity capacity that could be mobilized to support the grid through smart appliances, electric vehicles, and home batteries, though only a fraction of this potential is currently being utilized. Octopus believes that if sufficient households delay non-essential electricity use during the eclipse window, it could reduce the requirement for the electricity system operator to activate additional gas-fired power stations to compensate for lost solar generation.
The National Energy System Operator has been preparing for over a year to manage the eclipse’s effects, describing it as “one of the most unusual evenings our control room will manage this year.” Across Europe, the eclipse is projected to eliminate approximately 9.7 gigawatts of power production between specified times, with Spain potentially losing up to 5 gigawatts of solar capacity. The situation is compounded by existing pressures on Europe’s electricity supply from ongoing heatwaves, which have forced nuclear and coal plants to reduce output or shut down due to insufficient water for cooling and severely depleted hydropower reservoirs.
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