Europe power system faces solar eclipse strain amid heatwave outages

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Europe power system under strain

Highlights

Wednesday’s solar eclipse will reduce European solar generation by up to 9.7GW between 7.15pm and 9.30pm, intensifying supply pressures amid existing outages.
Heatwave-driven low river levels force shutdowns or reduced output at multiple nuclear and coal plants in Hungary, Romania, France, Italy and Poland, eliminating at least 4.3GW of capacity.
Norwegian hydropower reservoirs are at their lowest in 30 years, with Ably Intelligence putting the chance of stocks returning to normal by year-end at under 1 percent.

Eclipse adds to supply pressure

As reported by Financial Times, citing the European Commission, heatwaves have forced power plants in Hungary, Romania, Slovenia, France, Italy and Poland to shut down or cut output because low river levels are limiting the cooling water needed for nuclear and coal facilities.

Grid operators warn Wednesday’s solar eclipse will intensify that strain. The eclipse is total across northern Spain and the northeast corner of Portugal, and exceeds 90 percent across much of the UK, France and northern Italy.

Spain’s grid operator Red Eléctrica says the event could cut Spanish solar generation by as much as 5GW, equal to 13 percent of maximum demand for a typical Wednesday in August. ENTSO-E says it expects 9.7 gigawatts of power production to be lost across Europe between 7.15pm and 9.30pm local time, matching earlier estimates from French grid operator RTE, while operators prepare to balance the system with other sources.

In Britain, which trades electricity with mainland Europe, the national system operator expects about a 700-megawatt reduction in solar generation, although historic modelling suggests the impact could reach 1.3GW. An official from the operator says the eclipse’s effects extend widely across the region as the moon blocks 95 percent of the sun between 6pm and 8pm local time.

Heatwave damage exposes wider risks

Low water levels are already disrupting generation across Europe. In Hungary, the 2GW Paks nuclear plant on the Danube comes within a few millimetres of shutting down before water levels rise, while Romania uses explosives to redirect the Danube’s flow towards the Cernavodă nuclear plant to avoid a full shutdown.

In Poland, two large coal-fired stations temporarily reduce or shut generating units because the Vistula is too low to provide sufficient cooling water, removing about 1.3GW of capacity. In France, three nuclear reactors go offline because of low water levels, although the country continues exporting electricity to other parts of Europe.

Hydropower is also under pressure. According to Ably Intelligence, Norwegian reservoirs, a key source of exported electricity for Europe, are at their lowest levels in 30 years, and the firm estimates the chance of stocks returning to normal by the new year at less than 1 percent.

EDF chief executive Bernard Fontana says reactor shutdowns will weigh on the state-owned utility’s full-year profit and that the company will bring forward an 8.7 billion euro plan to adapt nuclear and hydroelectric assets for higher temperatures. Brussels says there are no immediate security-of-supply concerns, but Commission spokesperson Anna-Kaisa Itkonen describes the system as tight and says officials are closely monitoring weather forecasts, including expected rain in Austria that could lift Danube water levels.

Our earlier report on Britain’s power export limits during the heatwave explained how the National Energy System Operator temporarily cut day-ahead export capacity to zero on several interconnector links to protect domestic supply during “margin extremes.” It also highlighted how rising summer demand, lower renewable output at times, and operational constraints are making cross-border power flows more volatile and adding pressure to grid security.

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