Extreme heat is placing mounting strain on Europe's electricity grids as rising temperatures boost the need for air conditioning in homes, offices, and businesses. The June 2026 heatwave drove up electricity demand and wholesale power prices across the continent, underscoring how cooling needs are reshaping power systems.
Although air conditioning remains far less common in Europe than in many other regions, ownership is climbing as heatwaves become more frequent. According to the International Energy Agency (IEA), roughly 20% of European households now have AC, and that share is expected to grow as the continent warms.
“As Europe heats up, a growing number of people are reconsidering. Over the past 10 years, ownership of ACs has increased by about half, and annual sales are now about 30% higher than they were only 5 years ago,” said Fabian Voswinkel, energy efficiency policy analyst at the IEA.
Last week, Germany recorded exceptionally high temperatures on three consecutive days, with the eastern town of Coschen reaching 41.7°C on 28 June. France saw its hottest June day on record on 24 June, with temperatures hitting 43.8°C in Palluau in western France. Spain also experienced its hottest June days on record on 23 and 24 June, prompting alerts across nine regions as temperatures neared 42°C, as reported in Spain's Second Heatwave of Summer 2026.
Electricity Demand Spikes Across Major Economies
Analysis of daily electricity demand in the EU's four largest economies—Germany, France, Italy, and Spain—reveals a clear pattern: hotter weather translated into higher consumption. According to data from Eurelectric, Germany's daily consumption rose from 1,267 GWh on 11 June to 1,396 GWh on 25 June. France recorded an even larger increase, from 1,048 GWh to 1,255 GWh over the same period, while demand also climbed in Italy and Spain.
The largest absolute increase was in France, where daily electricity demand rose by almost 20% over the two-week period. The French grid operator RTE noted that for every degree Celsius increase during intense heat, energy consumption generally rises by between 0.7 GW and 1 GW—three times less than the impact of a one-degree drop in winter. It is highly likely that cooling needs drove the average daily increase of 10 to 14 GW in consumption last week, compared to a period with seasonal temperatures.
Wholesale Prices Surge as Supply Tightens
The rise in demand, coupled with tighter supply, was mirrored in wholesale power markets. Prices climbed sharply across Europe's largest electricity markets, though the increase varied by country's energy mix and market conditions. Wholesale electricity prices are what suppliers pay before selling to households and businesses; they respond almost immediately to supply-demand changes and are a key indicator of system stress.
According to Eurelectric data, wholesale prices peaked between 23 and 24 June, coinciding with the highest temperatures and demand. Germany, which shares a market with Luxembourg, recorded the highest prices, exceeding €200/MWh. France saw prices reach almost €160/MWh, while Spain recorded a more moderate rise, peaking at just over €110/MWh.
The surge reflected more than just higher demand. Across northwestern Europe, Germany's wind generation fell sharply just as demand increased. With less cheap wind power available, the market relied on more expensive gas- and coal-fired generation, setting the wholesale price. Normally, France is Germany's main source of relatively cheap imported electricity, but this time France was forced to reduce nuclear power generation. EDF cut nuclear output by 4.1 GW—roughly 7% of France's electricity demand at the time—because river water temperatures rose too high, limiting safe cooling water for reactors.
This dual pressure of rising demand and constrained supply highlights the growing complexity of managing Europe's power grids during extreme heat events. The June heatwave linked to over 4,000 excess deaths across Western Europe further underscores the human toll of such weather.
The IEA expects cooling demand to become a growing source of electricity consumption, though it is unlikely to overtake other drivers such as electric vehicles, data centres, and heat pumps. “Cooling is an important, though not dominant, contributor to electricity demand growth in Europe,” Voswinkel said.
As Europe's climate continues to warm, the interplay between cooling needs and electricity systems will demand careful planning, investment in grid resilience, and a diversified energy mix to avoid price spikes and supply disruptions.
