The ongoing transition from fossil fuels to renewables is currently facing a challenge that is simultaneously ironic and pressing as the climate instability that renewables are built to address is now degrading their performance. Extreme heat reduces solar output, volatile precipitation undermines hydropower, and intensifying storms are forcing wind turbines into protective shutdowns. The global warming that makes the transition necessary is making it harder to execute.
For solar energy, the semiconductor materials that generate electricity from sunlight lose efficiency as they heat up. Studies measure the penalty at 0.4 to 0.5 percentage points for every degree above 25°C. During last summer’s heatwaves, for instance, generation fell sharply at precisely the point when cooling demand peaked.
Surface temperatures on solar panels were high enough to cut output by close to a fifth of rated capacity. A study of hundreds of European cities found that climate-driven warming raised average summer temperatures by 3.6°C in 2025.
Wind energy faces a different but equally disruptive challenge. When output peaks, grids receive more power than they can route, obliging operators to curtail turbines. Gas plants are then brought back online, a cycle that cost the UK close to $1.7 billion last year and Germany roughly $511,000.
At the other extreme, speeds above roughly 90 km/h (55.9 mph) trigger automatic shutdowns. Storm Ciarán in late 2023 demonstrated the risk, grounding offshore turbines across northern Europe and creating immediate dependence on gas generation.
Norway’s experience this winter illustrates a third dimension of climate vulnerability for renewables. The country, currently the largest hydroelectric operator in Europe, saw winter snowpack drop sharply after an unusually dry, mild season. Researchers put the resulting energy shortfall at roughly 25 terawatt-hours, broadly enough to supply several million homes annually.
The underlying driver is a shift in how precipitation falls across Europe. Rising temperatures are converting snowfall to rainfall, removing the natural winter water storage that snow gradually releases through spring.
Meanwhile, research by Ember, a clean energy think tank, found that half of all European grid operators cannot currently accommodate the renewable projects planned for their regions. Over 65% of planned large-scale wind and solar capacity due by 2030 will undoubtedly face major connection delays.
Around 16 gigawatts of smaller-scale installations are also at risk, affecting more than 1.5 million households. The constraints are most severe across a cluster of countries including Poland, Portugal, the Netherlands, and Romania.
Europe’s response has centered on a large-scale grid overhaul program, with the European Commission committing funds in excess of $1.4 trillion to rebuilding the continent’s electrical infrastructure. In the meantime, annual grid spending approaching $99.8 billion will be necessary to keep pace with the demands of a decarbonized system.
While the physics of renewable energy always demands infrastructure at scale, it has become quite evident how rapidly climate change can undermine the performance of the green energy systems being built to address it.
As the energy transition progresses, more thought needs to be given to leveraging electric vehicles and marine vessels, such as those being electrified by companies like Vision Marine Technologies Inc. (NASDAQ: VMAR), as integrated energy storage systems to stabilize grids when extreme weather stresses energy generation.
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