en.Wedoany.com Reported - In May, solar photovoltaic (PV) power accounted for 28.5% of Spain's total electricity generation, setting a new historical record for this technology in the country's power mix. According to data from Red Eléctrica de España (REE), after adjusting for temperature and working-day effects, national electricity demand increased by 0.1% year-on-year.

Spain's gross electricity demand in May was 19,783 GWh, up 1.2% from the same month in 2025. Based on available data, self-consumption generation facilities produced approximately 1,368 GWh. In the first five months of the year, total electricity demand in Spain reached 104,801 GWh, a 1.4% increase year-on-year; after adjusting for working-day and temperature effects, the growth rate was 1%.

Renewable energy technologies generated a total of 13,259 GWh in May, up 3.2% from the same month last year, accounting for 60.5% of total generation. Solar PV led all energy sources for the second consecutive month, producing 6,254 GWh, or 28.5% of the total. May 29 recorded the highest daily solar PV output ever, with 269 GWh generated, representing 33.4% of that day's generation mix.

In the May generation ranking, nuclear power ranked second with a 17.1% share, wind power third at 14.8%, combined cycle gas turbines at 13.6%, and hydropower fifth at 12.9%. During the month, 77.7% of electricity came from CO2-free sources, with emission-free generation increasing by 7% year-on-year. When including self-consumption generation, the share of renewables in Spain's power mix rose to 62%.

To promote better utilization of renewable energy, a total of 1,182 GWh of electricity was integrated into the grid in May through battery storage and pumped storage facilities, which subsequently fed 489 GWh back into the grid. By the end of the month, these storage technologies had retained 693 GWh of electricity.

In the extra-peninsular system areas, electricity demand in the Balearic Islands in May (adjusted for working-day and temperature effects) increased by 3.1% year-on-year. Gross demand for the month was estimated at 494,445 MWh, up 3.5% from the same month in 2025. In the first five months of 2026, electricity demand in the Balearic Islands reached 2,301,697 MWh, a 2.8% increase compared to the same period in 2025. In terms of generation, combined cycle power plants accounted for 64.1% of the islands' monthly output, making it the largest power source; solar PV generation grew by 6.3%, representing 15.4% of the total. Renewable energy generation increased by 9.2% compared to May 2025, accounting for 18.9% of the islands' total generation. Additionally, the submarine power line between the mainland and Mallorca met 23.2% of the islands' electricity demand.

In the Canary Islands, electricity demand in May (adjusted for working-day and temperature effects) rose by 7.8% year-on-year, with gross demand reaching 764,993 MWh, up 7.3% from May 2025. Cumulative electricity demand for 2026 stood at 3,665,764 MWh, a 2.4% increase over the same period in 2025. In terms of generation, combined cycle power plants accounted for 39.3% of the monthly output, making it the largest power source. Wind power represented 16.8%, up 29.2% from May 2025; solar PV generation grew by 29.6% to 58,008 MWh, accounting for 7.6% of the total, setting a new record for the islands. In May, renewable energy generation in the islands accounted for 24.4% of total output.

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