Tomakomai Mill power station is a 73 MW coal power plant in Hokkaido, Japan. It is operated by Oji Paper Co Ltd. Based on its capacity (estimated), it can supply roughly 91k homes (estimated). It ranks #280 of 692 Japan power plants by installed capacity. Commissioned in 1986, it is around 40 years old — long-established. Its modelled annual emissions are 1,614,000 t CO₂/yr (Climate TRACE), equivalent to about 376k cars driven for a year. In context, coal supplies about 32.1% 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 WRI1020052.
Data status
Known data
Modelled source data
Calculated from dataset
Not available
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
Data provenance
Capacity and fuel are the upstream open-dataset record, not yet matched to a 2026 registry or GEM entry.
capacity: WRI GPPD; fuel: WRI GPPD
In context: how this plant compares
At 73 MW, Tomakomai Mill power station is below the median coal plant in Japan (250 MW). Coal plants burn pulverised coal to raise high-pressure steam for a turbine; they run as baseload but are the most carbon-intensive mainstream source and the first targeted for retirement or efficiency retrofits.
Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.
~1,614,000 t CO₂/yr (modelled) — in everyday terms
This facility's annual emissions are roughly equivalent to:
Equivalencies via US EPA Greenhouse Gas Equivalencies; modelled emissions from Climate TRACE.
Key facts
- Share of Japan coal capacity
- 0.1% of 53,431 MW across 94 plants in this dataset
- Age among peers
- 15 of 83 dated coal 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 coal plants in Japan
Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).
Owner
Operated by Oji Paper Co Ltd.
Local climate & thermal context
This coal plant burns coal to raise high-pressure steam that spins a turbine-generator. 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.
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 #82 largest coal power plant of 94 in Japan by capacity.
Japan has 94 coal power plants in this dataset, together about 53,431 MW of capacity.
Nearby power plants
- Tomakomai power station · Gas · 250 MW · Hokkaido
- Tomakomai - Mitsui Fudosan Solar Power Plant · Solar · 23 MW · Hokkaido
- Tomakomai - Japan Petroleum Solar Power Plant · Solar · 2.4 MW · Hokkaido
- Yufutsu A · Solar · 14 MW · Hokkaido
- Tomakomai - Marubeni Solar Power Plant · Solar · 29.8 MW · Hokkaido
- Chitose · Solar · 28 MW · Hokkaido
Location
Coordinates 42.6359, 141.5886 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is Tomakomai Mill power station?
Tomakomai Mill power station is a 73 MW coal power plant in Hokkaido, Japan, commissioned in 1986.
Who operates Tomakomai Mill power station?
Tomakomai Mill power station is operated by Oji Paper Co Ltd.
How much CO₂ does Tomakomai Mill power station emit?
Tomakomai Mill power station has modelled emissions of about 1,614,000 tonnes of CO₂ per year (Climate TRACE).