GENERATION 2025
Non renewable electricity generation
Information based on provisional data as of January 2026
In 2025, national non-renewable electricity generation increased after two consecutive years of decline
Non-renewable electricity generation in the Spanish electricity system in 2025 increased by 7.0% compared to the previous year, standing at 121,212 GWh. This accounted for 44.5% of the national generation structure, compared to the 43.2% recorded in 2024.
Non-renewable energy in the peninsular system registered a total generation of 109,543 GWh in 2025, 7.3% higher than in 2024. This increase in non-renewable generation resulted in an increase in its contribution to total peninsular generation, reaching a share of 42.5% in 2025, compared to 41.0% in 2024. This increase in non-renewable generation is due to increased combined cycle generation, which generated 33.3% more than in 2024.
In the Islas Baleares, non-renewable energy generation increased by 7.8% in 2025 due to a increase in electricity generation from diesel engines and gas turbine and combined cycle power plants, which was 20.8%, 0.8%, and 7.3% higher than in 2024.
In the Islas Canarias, generation from fossil fuel power plants increased by 0.9%, due to a 6.2% increase in electricity generation from gas turbines and a 5.1% increase in production from steam turbines. Combined cycle power plants generated 1.6% more than in 2024 and recorded the highest electricity generation rate since records began in 2006, with 3,796,042 MWh.
Annual evolution of national non-renewable electricity generation
Non-renewable electricity generation structure by power station type and by autonomous communities
The net production of non-renewable UGH installations has been adjusted to account for their own consumption. In these types of generation, negative generation indicates that the electricity consumed for the power plant’s uses exceeds its gross electricity generation.
Pumped storage: Pure pumped storage + estimated mixed pumped storage.
Utilisation rate of peninsular thermal power plants
Utilisation rate of thermal power plants: the utilisation rate is the ratio between actual electricity generation and the available electricity generation capacity, or maximum electricity generation, that the power plant could achieve by operating at its rated power during the entire time it is available.
Electricity generation from coal-fired power plants on the Peninsula recorded a historic low in 2025
The decarbonisation challenges set by the European Union to reduce CO2 emissions have led to a 50% decline in coal-based electricity generation in the Spanish electricity system in 2025 compared to the previous year. Coal continues to have a minimal share in the energy mix, reaching a historic low of just 0.6% of total generation.
In 2025, coal-fired plants on the Peninsula generated 1,420 GWh, 52.2% less than the previous year. This year marks the lowest values since statistical records began. Throughout every month of 2025, except for January and February, monthly coal-based electricity generation was lower than in the same months of the previous year, with no electricity generation from coal occurring in the entire month of August. In addition, the period from March to December recorded the lowest monthly coal-based monthly electricity generation rates to date for each of these months.
The utilisation rate (the ratio between actual electricity generation and the maximum electricity generation that the power plants could have achieved by operating at their rated power during the entire time they were available) of peninsular coal-fired power plants in 2025 stood at 24.3%, up from 23.4% the previous year.
Utilisation and availability of coal generators on the Peninsula, 2025
(1)It is the ratio of actual output to available output, or the maximum output the plant could achieve while operating at rated capacity during the hours it is available.
(2)It is the ratio of actual output to the total output the plant could have achieved had it been operating at rated capacity during the hours it was online (generating).
(3) Set to end in July 2025
In mid-July 2025, the Aboño II thermal power plant (located in Asturias) was modified to remove its coal-burning capacity and convert it to gas. The plant is now registered in the Facility registry under the steam turbine technology.
Utilisation and availability of steam turbines on the Peninsula, 2025
It is the ratio of actual output to available output, or the maximum output the plant could achieve while operating at rated capacity during the hours it is available.
It is the ratio of actual output to the total output the plant could have achieved had it been operating at rated capacity during all the hours it was online (generating power).
In 2025, combined cycle was once again the fourth largest source of national generation
In line with total non-renewable energy generation, in 2025, electricity generation from combined cycle plants in the Spanish electricity system increased by 27.9% compared to the previous year, once again ranking fourth in the national generation mix, with a share of 16.8% of the total, 3.2 percentage points more than in 2024.
In 2025, electricity generation from combined cycle plants on the Peninsula was 33.3% higher than in 2024, with the greatest increases recorded during the third and fourth quarters of the year. Throughout almost every month of 2025 (except for January and December), monthly electricity generation from combined cycle plants on the Peninsula was lower than in the same period of the previous year, with June seeing the most pronounced monthly increase, rising by 143.5%.
The higher rate of annual electricity generation from combined cycle plants on the Peninsula resulted in a 3.3 percentage points increase in their representation in the energy mix, reaching a share of 15% in the peninsular structure in 2025, compared to 11.7% in 2024.
The utilisation rate of peninsular combined cycle generation in 2025 was 23.8% (16.9% in 2024).
In 2025, the combined cycle power plants of the Islas Baleares electricity system generated 3,25,439 MWh, 7.3% more than in 2024. For the sixth consecutive year, this technology represented the main source of generation in the Islas Baleares mix, with a share of 65.4% in the electricity generation structure.
In the Islas Canarias electricity system, combined cycle power plants produced 1.6% more in 2025 than in 2024, reaching an all-time high of 3,796,042 MWh. Furthermore, combined cycle power plants were once again, and for the fifteenth consecutive year, the leading technology in the Islas Canarias generation mix, with a share of 42.2%. On Thursday, 18 September 2025, electricity generation from combined cycle power plants reached the highest value ever recorded to date, with 15,803 MWh.
Utilisation and availability of combined cycle plants on the Peninsula, 2025
Among non-renewable energy technologies, nuclear generated a total of 51,846 GWh in 2025, 1% less than the previous year.
In April, nuclear generation fell by 16.3% and in May, it dropped by 13.6% due to the unavailability of the Trillo power plants for refuelling work from 24 March to 26 April and Ascó 2 for inspection and refuelling work from 2 May to 18 June. In September, nuclear electricity generation decreased by 9.5%, and in October, by 20.3% due to the unavailability of the Cofrentes, Vandellós II, and Almaraz 2 power plants, which underwent refuelling from September until November.
In 2025, nuclear power plants were the second-largest source of electricity generation on the Peninsula, with a share of 20.1% of the peninsular generation mix, a slightly lower share than in 2024, when it also ranked second with 21.1%. During February, nuclear power was the leading technology in the peninsular generation mix, with a share of 23.1%.
The utilisation rate was 97.4%, higher than in 2024, when it was 94.9%.
Utilisation and availability of nuclear generators on the Peninsula, 2025
(1)It is the ratio of actual output to available output, or the maximum output the plant could achieve while operating at rated capacity during the hours it is available.
(2)It is the ratio of actual output to the total output the plant could have achieved had it been operating at rated capacity during all the hours it was online (generating).
2025 saw a rise in CO2 equivalent emissions from national electricity generation
In 2025, CO2-equivalent emissions from national electricity generation reached 29.5 million tonnes of CO2 equivalent, representing an increase of 9.1% compared to 2024 (the historical minimum) while still marking a 9.1% reduction compared to 2023 (the previous historical minimum).
CO2 emissions and CO2 equivalent emission factors associated with national electricity generation
Electricity generation
Renewable electricity generation
Electricity generation
Non renewable electricity generation