Onahama 2 Solar Power Plant is a 6 MW solar power plant in Fukushima, Japan. It is operated by Onahama Izumi Solar LLC. Based on its capacity (estimated), it can supply roughly 2,552 homes (estimated). It ranks #556 of 659 Japan power plants by installed capacity. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, solar supplies about 9.8% 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 WRI1026542.
Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).
Operated by Onahama Izumi Solar LLC.
This solar plant converts sunlight directly into electricity with photovoltaic panels. It sits in a humid subtropical climate (Köppen Cfa) — Northern Hemisphere, latitude 36.9°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 12% 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: 46/100 — this site sits in the mid 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.
Solar PV loses ~0.35%/°C above 25°C cell temperature — roughly 0.0% at warm-season highs here (estimate).
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 #233 largest solar power plant of 324 in Japan by capacity.
Japan has 324 solar power plants in this dataset, together about 5,687 MW of capacity.
Coordinates 36.9331, 140.8544 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
