Hamaoka — Japan

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.

Data provenance

Source of the capacity and fuel values:

capacity: Wikidata P2109; fuel: WRI GPPD

In context: how this plant compares

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.

How it compares & nearby plants

The #5 largest nuclear power plant of 24 in Japan by capacity.

Japan has 24 nuclear power plants in this dataset, together about 58,491 MW of capacity.

Nearby power plants

• Jitōgata A · Solar · 14 MW · Shizuoka
• Jitōgata B · Solar · 6.5 MW · Shizuoka
• Kikugawa B · Solar · 7.6 MW · Shizuoka
• Kikugawa Ishiyama Solar Power Plant · Solar · 9.4 MW · Shizuoka
• Omaezaki power station · Biomass · 75 MW · Shizuoka
• Kikugawa Horinouchiya Solar Power Plant · Solar · 7.5 MW · Shizuoka

Location

Coordinates 34.6235, 138.1421 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions