Tomakomai power station is a 250 MW gas power station in Hokkaido, Japan. It is operated by Hokkaido Electric Power Co Inc [100%]. Based on its capacity (estimated), it can supply roughly 282k homes (estimated). It ranks #186 of 692 Japan power plants by installed capacity. Commissioned in 1973, it is around 53 years old — an older, legacy facility. In context, gas supplies about 32.8% 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 GOGPT_tomakomai_japan.
Data status
Known data
Calculated from dataset
Not available
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
Data provenance
Source of the capacity and fuel values:
capacity: GEM · 2026 · L100000408489; fuel: GEM GOGPT
In context: how this plant compares
At 250 MW, Tomakomai power station is below the median gas plant in Japan (847.4 MW). Technically it is described as Steam. Gas plants burn natural gas either in open-cycle turbines for fast peaking, or in combined-cycle units that recover exhaust heat in an HRSG to reach roughly 55–62% efficiency — the cleanest-burning fossil option.
Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.
Key facts
- Share of Japan gas capacity
- 0.3% of 74,949 MW across 66 plants in this dataset
- Age among peers
- 6 of 58 dated gas plants in Japan are older
Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).
Capacity vs largest gas plants in Japan
Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).
Owner
Operated by Hokkaido Electric Power Co Inc [100%].
Local climate & thermal context
This gas plant burns natural gas in a turbine — often in a combined-cycle setup — to generate electricity. It sits in a warm-summer humid continental climate (Köppen Dfb) — Northern Hemisphere, latitude 42.6°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.
A gas turbine here also runs ~0% below its ISO (15°C) rating at this annual mean (typical CCGT curve, 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 #48 largest gas power plant of 66 in Japan by capacity.
Japan has 66 gas power plants in this dataset, together about 74,949 MW of capacity.
Nearby power plants
- Tomakomai - Mitsui Fudosan Solar Power Plant · Solar · 23 MW · Hokkaido
- Yufutsu A · Solar · 14 MW · Hokkaido
- Tomakomai - Japan Petroleum Solar Power Plant · Solar · 2.4 MW · Hokkaido
- Tomakomai Mill power station · Coal · 73 MW · Hokkaido
- Tomakomai - Marubeni Solar Power Plant · Solar · 29.8 MW · Hokkaido
- Tomatoh no Mori Solar Power Plant · Solar · 45.6 MW · Hokkaido
Location
Coordinates 42.638823, 141.659897 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is Tomakomai power station?
Tomakomai power station is a 250 MW gas power plant in Hokkaido, Japan, commissioned in 1973.
Who operates Tomakomai power station?
Tomakomai power station is operated by Hokkaido Electric Power Co Inc [100%].