Forsmark is a 3,227 MW nuclear power station in Uppsala, Sweden. It is operated by 65% Vattenfall; E.ON 8.5%; Mellansvensk Kraftgrupp 25.5%. Based on reported annual generation of 24,576 GWh, it can supply roughly 7,021,714 homes. It ranks #2 of 168 Sweden power plants by installed capacity. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, nuclear supplies about 27.6% of Sweden's electricity; the national grid averages 35 gCO₂/kWh (98.8% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id WRI1002098.
Annual generation (GWh), WRI Global Power Plant Database (CC BY 4.0).
Operated by 65% Vattenfall; E.ON 8.5%; Mellansvensk Kraftgrupp 25.5%.
This nuclear plant uses heat from nuclear fission to raise steam for a turbine-generator. It sits in a warm-summer humid continental climate (Köppen Dfb) — Northern Hemisphere, latitude 60.4°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 84% above 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: 91/100 — this site sits in the top 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 3 in Sweden by capacity.
Sweden has 3 nuclear power plants in this dataset, together about 9,762 MW of capacity.
Coordinates 60.4028, 18.1744 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
