Generation

Hydroelectric power generation was 3.6% lower than last year, due to higher rainfall, although it was a year with favourable rainfall, reaching 33,685 GWh. This type of electricity generation accounted for 12.4% of total national generation, which is lower than last year's 13.3%.

Hydroelectric power generation in Spain is highly variable, reaching over 40,000 GWh in wet years, while this volume drops by more than half in dry years. The year 2025 saw medium-high rainfall, with hydroelectric power generation reaching 33,685 GWh, 3.6% lower than in 2024. As a result, hydroelectric power contributed 12.4% of total national electricity generation, ranked fifth among generating technologies.

Evolution of hydroelectric power generation

Among all renewable energy sources, hydroelectric power ranked third, after wind power and solar photovoltaic, with 22.3% of the total renewable energy generated at the national level.

Annual share of hydroelectric power generation in total generation

In terms of hydroelectric power generation by autonomous communities, Castilla y León, Galicia, Extremadura, and Cataluña are the ones with the highest hydroelectric production in 2025.

Hydroelectric power generation in 2025

Hydroelectric power generation in each autonomous community as a share of national hydroelectric power generation

Historically, the final months of winter and the early months of spring are the periods with the greatest water contribution, mainly due to thawing and also to the higher rainfall in those months.

In 2025, March was the month in which most hydroelectric power generation was delivered, with 4,152 GWh (12.4% lower than the maximum value in 2024). April was also the month with the highest contribution from this technology to overall electricity generation, with 19.5% of total generation that month, followed by February, with 19.2%. February 2014 continues to hold the record.

Monthly hydroelectric power generation, peaks, and share of total generation

One of the main advantages of this technology over other renewable energies is its manageability, which is evident from the average daily curve of the share of hydroelectric power in total generation, which shows how the greatest contribution of this technology coincides with peak demand in the morning and in the evening.

Average hourly profile of hydroelectric power generation as a share of total generation in 2025

Hydroelectric power generation by hydrographic zone