Power and heat: emissions by company in Spain
34 Mt CO2e in 2025 from 302 power and heat installations in Spain, run by 191 companies; 2.3 Mt of it covered by free allowances. Source: Arcadium Data, data as of .
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Largest operating companies
| Operating company | Installations | Emissions 2025 | Free allocation | Allowances to buy |
|---|---|---|---|---|
| Naturgy Ciclos Combinados, S.L.U. | 11 | 6.1 Mt | ||
| Unión Eléctrica de Canarias Generación, S.A.U. | 11 | 5.0 Mt | ||
| Aboño Generaciones Eléctricas, S.L.U. | 1 | 2.6 Mt | ||
| Endesa Generación, S.A. | 7 | 2.4 Mt | ||
| Iberdrola Generación Térmica, S.L. | 6 | 2.3 Mt | ||
| GAS Y ELECTRICIDAD GENERACION SAU | 6 | 2.1 Mt | ||
| Repsol Generación Ciclos Combinados S.L.U. | 2 | 1.6 Mt | ||
| Generación Carteia, S.L. | 3 | 1.0 Mt | ||
| Generación Eléctrica Peninsular, S.A. | 4 | 0.7 Mt | ||
| Totalenergies Clientes, S.A.U. | 1 | 0.7 Mt | ||
| BIZKAIA ENERGIA, SLU | 1 | 0.6 Mt | ||
| Bahía de Bizkaia Electricidad, SL | 1 | 0.4 Mt | ||
| ContourGlobal La Rioja, S.L | 1 | 0.4 Mt | ||
| EDP España, S.A. | 1 | 0.4 Mt | ||
| EnergyWorks Cartagena, S.L. | 1 | 0.3 Mt | ||
| ENGIE CARTAGENA, S.L | 1 | 0.3 Mt | ||
| Tarragona Power, s.l. | 1 | 0.3 Mt | 8 kt | 0.2 Mt |
| ENERGYWORKS VIT-VALL, S.L. | 2 | 0.2 Mt | ||
| VISCOFAN ESPAÑA S.L.U. | 1 | 0.2 Mt | 21 kt | 0.2 Mt |
| ENAGAS TRANSPORTE, S.A.U | 16 | 0.2 Mt | 40 kt | 0.1 Mt |
| BIOCARBURANTES DE CASTILLA Y LEÓN, S.A. | 1 | 0.2 Mt | 75 kt | 87 kt |
| AB AZUCARERA IBERIA, S.L. | 4 | 0.2 Mt | 57 kt | 97 kt |
| Alpiq Energía España S.A.U | 1 | 0.1 Mt | ||
| Bioetanol Galicia, S.A. | 1 | 0.1 Mt | 53 kt | 90 kt |
| Zero Waste Bioenergy Castilla la Mancha, S.L.U. | 2 | 0.1 Mt | 12 kt | 97 kt |
Largest installations
| Installation | Activity | Country | Operating company | Emissions 2025 |
|---|---|---|---|---|
| Aboño Generaciones Eléctricas, S.L.U. | Combustion of fuels | Spain | Aboño Generaciones Eléctricas, S.L.U. | 2.6 Mt |
| Unión Eléctr. de Canarias Generación-CT Granadilla | Combustion of fuels | Spain | Unión Eléctrica de Canarias Generación, S.A.U. | 2.0 Mt |
| Unión Eléct.Canarias Generac.-CT Barranco Tirajana | Combustion of fuels | Spain | Unión Eléctrica de Canarias Generación, S.A.U. | 1.7 Mt |
| CCC - Cartagena | Combustion of fuels | Spain | Naturgy Ciclos Combinados, S.L.U. | 1.1 Mt |
| CCC. - Sagunto | Combustion of fuels | Spain | Naturgy Ciclos Combinados, S.L.U. | 1.1 Mt |
| CCC -Palos de la Frontera | Combustion of fuels | Spain | Naturgy Ciclos Combinados, S.L.U. | 1.0 Mt |
| Iberdrola Generación Térmica-Central C.C.Arcos | Combustion of fuels | Spain | Iberdrola Generación Térmica, S.L. | 0.9 Mt |
| Gas y Electricidad Generación SAU-CT Cas Tresorer | Combustion of fuels | Spain | GAS Y ELECTRICIDAD GENERACION SAU | 0.9 Mt |
| Repsol Generación Eléctrica(Escatrón-C.Combinado) | Combustion of fuels | Spain | Repsol Generación Ciclos Combinados S.L.U. | 0.8 Mt |
| C.T. de Ciclo Combinado Bahía de Algeciras | Combustion of fuels | Spain | Repsol Generación Ciclos Combinados S.L.U. | 0.8 Mt |
| Combustion of fuels | Combustion of fuels | Spain | 0.8 Mt | |
| Totalenergies Clientes, S.A.U. - Castejón -1 | Combustion of fuels | Spain | Totalenergies Clientes, S.A.U. | 0.7 Mt |
| Endesa Generación, S.A. - As Pontes | Combustion of fuels | Spain | Endesa Generación, S.A. | 0.6 Mt |
| CCC- Central de Barcelona | Combustion of fuels | Spain | Naturgy Ciclos Combinados, S.L.U. | 0.6 Mt |
| Bizkaia Energía, S.L.U. - Amorebieta | Combustion of fuels | Spain | BIZKAIA ENERGIA, SLU | 0.6 Mt |
| CCC - Besos | Combustion of fuels | Spain | Naturgy Ciclos Combinados, S.L.U. | 0.6 Mt |
| Gas y Electricidad Generación S.A.U.-C.T. Son Reus | Combustion of fuels | Spain | GAS Y ELECTRICIDAD GENERACION SAU | 0.5 Mt |
| Central Térmica Ciclo Combinado Besós 5 | Combustion of fuels | Spain | Endesa Generación, S.A. | 0.5 Mt |
| CCC-Aceca | Combustion of fuels | Spain | Naturgy Ciclos Combinados, S.L.U. | 0.5 Mt |
| CCC Campo de Gibraltar Grupo 10 | Combustion of fuels | Spain | Naturgy Ciclos Combinados, S.L.U. | 0.5 Mt |
| CCC Campo de Gibraltar Grupo 20 | Combustion of fuels | Spain | Generación Carteia, S.L. | 0.5 Mt |
| C. Térmica Ciclo Combinado de San Roque-(Grupo 2) | Combustion of fuels | Spain | Endesa Generación, S.A. | 0.5 Mt |
| Unión Eléctr. Canarias Generación-CD Punta Grande | Combustion of fuels | Spain | Unión Eléctrica de Canarias Generación, S.A.U. | 0.5 Mt |
| CCC Sabón | Combustion of fuels | Spain | Naturgy Ciclos Combinados, S.L.U. | 0.4 Mt |
| Bahía de Bizkaia Electricidad - BBE | Combustion of fuels | Spain | Bahía de Bizkaia Electricidad, SL | 0.4 Mt |
Emissions are verified EU Emissions Trading System emissions in tonnes of CO2 equivalent for 2025: the installations, aircraft operators and shipping companies covered by the ETS, not a company's total footprint (no scope 2 or 3, no sites outside the ETS). Free allocation is the free allowances allocated for the same year; "allowances to buy" is emissions minus free allocation, the exposure that grows as free allocation is phased out under CBAM from 2026. Companies only: an account holder that is not a company is never shown. Data as of 2026-10-25, updated yearly.
Emissions and allocation: European Commission, Union Registry of the EU ETS (verified emissions, free allocation, compliance and the list of operators; Commission reuse policy, CC BY 4.0). Parent company and pollutant releases of facilities: European Environment Agency, Industrial Emissions Portal (CC BY 4.0). Legal-entity identifiers: GLEIF (CC0).
Questions
Where does this data come from?
The European Commission publishes verified emissions, free allocation and compliance of every installation in the EU Emissions Trading System, and the list of operators with company registration number and LEI. We join them to the operating company, its website and its ultimate parent, and record changes each year.
Is this a full carbon footprint?
No. It covers emissions that fall under the EU ETS (power and heat, heavy industry, aviation within Europe, shipping). It has no scope 2 or scope 3 emissions and no sites outside the ETS.
Does the list show private persons?
No. Operators are shown only when they are companies. Account holders that could be natural persons are left out, and the data has no addresses or contact details.
Cite as: Arcadium Data, "Power and heat: emissions by company in Spain: 34 Mt in 2025", https://arcadiumdata.io/emissions/es/power-and-heat/, data as of 2026-10-25.