Tomakomai - Marubeni Solar Power Plant — Japan

Tomakomai - Marubeni Solar Power Plant is a 29.8 MW solar power plant in Hokkaido, Japan. It is operated by Tomakomai Yufutsu Mega-Solar Corporation. Based on its capacity (estimated), it can supply roughly 13k homes (estimated). It ranks #394 of 692 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 WRI1026576.

Data provenance

Source of the capacity and fuel values:

capacity: GEM · 2026 · L100000801494; fuel: WRI GPPD

In context: how this plant compares

At 29.8 MW, Tomakomai - Marubeni Solar Power Plant is well above the median solar plant in Japan (13 MW). Solar PV converts sunlight directly into electricity with no moving parts or fuel; output varies by time of day and weather, so it pairs with storage or flexible backup.

Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.

Key facts

Share of Japan solar capacity

0.5% of 5,680 MW across 324 plants in this dataset

Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).

Capacity vs largest solar plants in Japan

Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).

Owner

Operated by Tomakomai Yufutsu Mega-Solar Corporation.

Local climate & thermal context

This solar plant converts sunlight directly into electricity with photovoltaic panels. It sits in a warm-summer humid continental climate (Köppen Dfb) — Northern Hemisphere, latitude 42.7°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 67% 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: 85/100 — this site sits in the top third of the power plants we cover by heating degree-days.

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.

Site climate & environmental severity

This site sits in a moderately corrosive environment (estimated ISO 9223 class C3 — Medium), with thermal cycling the leading environmental stress.

Indicative estimate via the ISO 9223:2012 informative method (atmospheric corrosivity from temperature, time-of-wetness and airborne salinity), using WorldClim climate normals, the Köppen-Geiger class and coast distance. Indicative, not a measured corrosion rate.

How it compares & nearby plants

The #55 largest solar power plant of 324 in Japan by capacity.

Japan has 324 solar power plants in this dataset, together about 5,680 MW of capacity.

Nearby power plants

• Tomakomai - Japan Petroleum Solar Power Plant · Solar · 2.4 MW · Hokkaido
• Yufutsu A · Solar · 14 MW · Hokkaido
• Tomakomai - Mitsui Fudosan Solar Power Plant · Solar · 23 MW · Hokkaido
• Tomakomai power station · Gas · 250 MW · Hokkaido
• Tomatoh no Mori Solar Power Plant · Solar · 45.6 MW · Hokkaido
• Sanix Energy Tomakomai power station · Biomass · 74 MW · Hokkaido

Location

Coordinates 42.6584, 141.7268 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions