Tomari is a 2,070 MW nuclear power station in Hokkaido, Japan. It ranks #29 of 692 Japan power plants by installed capacity. Commissioned in 1989, it is around 37 years old — long-established. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, nuclear supplies about 9.1% of Japan's electricity; the national grid averages 477 gCO₂/kWh (32.7% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id WRI1000674.
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
The capacity and/or fuel fields on this page include a source-backed provenance label from GEM, an official registry, Wikidata, OSM, or a cross-source match.
capacity: Wikidata P2109; fuel: WRI GPPD
At 2,070 MW, Tomari is around the median nuclear plant in Japan (2,070 MW). Technically it is described as pressurized water reactor. Its current lifecycle status is “Mothballed” — so it is not yet, or no longer, generating at full output. 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.
The #12 largest nuclear power plant of 24 in Japan by capacity.
Japan has 24 nuclear power plants in this dataset, together about 61,851 MW of capacity.
Coordinates 43.0367, 140.5125 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Tomari is a 2,070 MW nuclear power plant in Hokkaido, Japan, commissioned in 1989.
