TRILLO — Spain

TRILLO is a 1,066 MW nuclear power station in Castille-La Mancha, Spain. It is operated by IBERDROLA GENERACION S.A.. Based on reported annual generation of 7,983 GWh, it can supply roughly 2.3 million homes. It ranks #18 of 899 Spain power plants by installed capacity. Commissioned in 1988, it is around 38 years old — long-established. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, nuclear supplies about 18.8% of Spain's electricity; the national grid averages 154 gCO₂/kWh (74.6% low-carbon) (2025).

Plant data: WRI Global Power Plant Database (CC BY 4.0), id WRI1007993.

Data provenance

Source of the capacity and fuel values:

capacity: GEM · 2026 · L100000500105; fuel: WRI GPPD

In context: how this plant compares

At 1,066 MW, TRILLO is around the median nuclear plant in Spain (1,087 MW). Technically it is described as pressurized water reactor. Nuclear plants split uranium to raise steam with no direct CO₂; they run as steady baseload with very high capacity factors and the longest operating lifetimes of any thermal plant.

Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.

Key facts

Load factor

85%, from 7,983 GWh of reported generation, in line with the 85% median for 5 nuclear plants in Spain

Generation trend

7,903 GWh in 2015 and 7,983 GWh in 2017 (+1%)

Highest and lowest year

2017: 7,983 GWh; 2015: 7,903 GWh

Share of Spain nuclear capacity

8.9% of 11,959 MW across 10 plants in this dataset

Age among peers

6 of 7 dated nuclear plants in Spain are older

Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).

Reported generation trend

Annual generation (GWh), WRI Global Power Plant Database (CC BY 4.0).

Owner

Operated by IBERDROLA GENERACION S.A.. All plants by this company →

Local climate & thermal context

This nuclear plant uses heat from nuclear fission to raise steam for a turbine-generator. It sits in a warm-summer Mediterranean climate (Köppen Csb) — Northern Hemisphere, latitude 40.7°N — which shapes how much energy it can produce and how its output varies through the year.

Monthly mean temperature

Heating degree-days here run 4% below the median power plant in this dataset — a proxy for how much extra energy heated equipment must replace through its surfaces in winter.

Climate heat-demand index: 49/100 — this site sits in the mid third of the power plants we cover by heating degree-days.

Climate normals: WorldClim 2.1 (1970–2000 monthly normals, 10 arc-min, CC BY 4.0); zone: Köppen-Geiger world climate classification (Kottek et al. 2006, 0.5° grid). Degree-days & heat-demand index computed by PowerAtlas — a modelled heat-demand proxy, not a measured site figure.

Site climate & environmental severity

This site sits in a mild atmospheric environment (estimated ISO 9223 class C2 — Low), with humidity / wetness the leading environmental stress.

Indicative estimate via the ISO 9223:2012 informative method (atmospheric corrosivity from temperature, time-of-wetness and airborne salinity), using WorldClim climate normals, the Köppen-Geiger class and coast distance. Indicative, not a measured corrosion rate.

How it compares & nearby plants

The #7 largest nuclear power plant of 10 in Spain by capacity.

Spain has 10 nuclear power plants in this dataset, together about 11,959 MW of capacity.

Nearby power plants

• P.E. CANREDONDO I · Wind · 28 MW · Castille-La Mancha
• ENTREPENAS GRUPO 1 · Hydro · 40.8 MW · Castille-La Mancha
• BUENDIA GRUPO 1 · Hydro · 54.5 MW · Castille-La Mancha
• BOLARQUE I GRUPO 1 · Hydro · 27.9 MW · Castille-La Mancha
• BOLARQUE II GRUPO 1 · Hydro · 220 MW · Castille-La Mancha
• P.E. EL GRANADO · Wind · 14.4 MW · Castille-La Mancha

Location

Coordinates 40.7016, -2.6227 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

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