AR5 concluded with high confidence that climate-induced changes, including changes in water flows, will affect energy production, and the actual impact will depend on the technological processes and location of energy production facilities . SR1.5 concluded with high confidence that climate change is projected to affect the hydropower production of northern European countries positively. However, Mediterranean countries like Greece, Spain and Portugal are projected to experience approximately a 10% reduction in hydropower potential under a 2℃ warming level, which could be reduced by half if global warming could be limited to 1.5℃ . In addition, SROCC concluded with high confidence that an altered amount and seasonality of water supply from snow and glacier melt is projected to affect hydropower production negatively .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report