French power prices surge as heatwave squeezes supply and boosts cooling demand

Tuesday 11 August 2026 - 10:00

By: Sahili Aya

French power prices surge as heatwave squeezes supply and boosts cooling demand

French wholesale electricity prices surged by more than 20% on Tuesday as an intense heatwave increased demand for cooling while tightening power supply, according to LSEG data.

Day-ahead electricity prices rose 20.5% to €141 per megawatt-hour, reflecting growing pressure on the French power market as temperatures climb across the country.

The combination of stronger consumption and reduced generation capacity is creating a particularly challenging environment for the market, with further restrictions on nuclear output expected on Wednesday.

Heatwave pushes electricity consumption higher

Demand for electricity is increasing as households and businesses rely more heavily on air conditioning and other cooling equipment.

French day-ahead electricity consumption was forecast to rise by 1.6 gigawatts to 46.4 GW on Wednesday, according to LSEG data.

Average temperatures across France are expected to reach 28.8 degrees Celsius, around 7.4 degrees above the seasonal norm.

The unusually high temperatures are therefore adding a significant load to the electricity system at a time when available generation is also coming under pressure.

Nuclear output faces further constraints

France's nuclear fleet is expected to face additional curtailments on Wednesday as temperatures continue to rise.

High temperatures can complicate the operation of nuclear power plants, particularly when cooling systems depend on water resources whose temperature and availability become increasingly constrained during heatwaves.

Any reduction in nuclear generation can have a particularly visible impact on the French market because nuclear power represents a major component of the country's electricity supply.

The expected curtailments are therefore contributing to the upward pressure on wholesale prices.

Market reacts to tighter supply

The sharp increase in day-ahead prices reflects the market's response to the narrowing balance between electricity availability and consumption.

At €141/MWh, Tuesday's price was more than one-fifth higher than the previous session, illustrating how quickly weather conditions can affect European power markets.

The situation could remain volatile if temperatures stay elevated and additional generation capacity is taken offline.

Heat puts energy resilience in focus

The latest price surge highlights the growing importance of weather conditions for electricity markets.

Heatwaves can create a double pressure: consumers require more electricity to keep buildings cool, while certain forms of generation may become less available.

For France, the combination of elevated temperatures, stronger demand and expected nuclear curtailments is putting additional stress on the power system.

Market conditions over the coming days will depend largely on the evolution of temperatures and the extent to which nuclear generation is reduced.