ASCO GR is a 1,990 MW nuclear power station in Catalonia, Spain. It is operated by ENDESA GENERACION S.A.. Based on reported annual generation of 15,242 GWh, it can supply roughly 4,354,800 homes. It ranks #2 of 872 Spain power plants by installed capacity. Commissioned in 1983, it is around 43 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 WRI1006213.
Annual generation (GWh), WRI Global Power Plant Database (CC BY 4.0).
Operated by ENDESA GENERACION S.A.. All plants by this company →
This nuclear plant uses heat from nuclear fission to raise steam for a turbine-generator. It sits in a hot-summer Mediterranean climate (Köppen Csa) — Northern Hemisphere, latitude 41.2°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 42% 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: 33/100 — this site sits in the bottom third of the power plants we cover by heating degree-days.
In colder climates, uninsulated hot equipment (boilers, turbines, valves, steam lines) loses proportionally more heat to ambient air — exactly the loss Inzonex modular insulation is designed to cut.
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.
The #2 largest nuclear power plant of 5 in Spain by capacity.
Spain has 5 nuclear power plants in this dataset, together about 7,120 MW of capacity.
Coordinates 41.2008, 0.5679 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
