Hamaoka is a 3,504 MW nuclear power station in Shizuoka, Japan. It ranks #13 of 692 Japan power plants by installed capacity. Commissioned in 1976, it is around 50 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 WRI1000680.
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 3,504 MW, Hamaoka is well above the median nuclear plant in Japan (2,070 MW). Technically it is described as boiling 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 #5 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 34.6235, 138.1421 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Hamaoka is a 3,504 MW nuclear power plant in Shizuoka, Japan, commissioned in 1976.
