Kellosaari is a 120 MW oil power station in Uusimaa, Finland. It is operated by Helsingin Energia. Based on its capacity (estimated), it can supply roughly 90k homes (estimated). It ranks #35 of 203 Finland power plants by installed capacity. Commissioned in 1974, it is around 52 years old — an older, legacy facility. In context, oil supplies about 2.3% of Finland's electricity; the national grid averages 57 gCO₂/kWh (96.3% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id WRI1002386.
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 · L100001000061; fuel: WRI GPPD
In context: how this plant compares
At 120 MW, Kellosaari is well above the median oil plant in Finland (52 MW). Technically it is described as OCGT. Oil-fired plants burn heavy fuel oil or diesel, usually as peaking or backup capacity on islands and grids without gas pipelines; high fuel cost keeps their utilisation low.
Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.
Key facts
- Share of Finland oil capacity
- 8.3% of 1,442 MW across 17 plants in this dataset
- Age among peers
- 2 of 5 dated oil plants in Finland are older
Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).
Capacity vs largest oil plants in Finland
Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).
Owner
Operated by Helsingin Energia. All plants by this company →
Local climate & thermal context
This oil plant burns oil or diesel to drive turbines or reciprocating engines. It sits in a warm-summer humid continental climate (Köppen Dfb) — Northern Hemisphere, latitude 60.2°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 87% 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: 91/100 — 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 corrosive environment (estimated ISO 9223 class C4 — High), with marine corrosion 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 #5 largest oil power plant of 17 in Finland by capacity.
Finland has 17 oil power plants in this dataset, together about 1,442 MW of capacity.
Nearby power plants
- Salmisaari B · Coal · 163 MW · Uusimaa
- Hanasaari B · Coal · 212 MW · Uusimaa
- Suomenoja power station · Coal · 279 MW · Uusimaa
- Martinlaakso · Gas · 171.7 MW · Uusimaa
- Vuosaari A · Gas · 163 MW · Uusimaa
- Vuosaari B · Gas · 485 MW · Uusimaa
Location
Coordinates 60.16188, 24.90872 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is Kellosaari?
Kellosaari is a 120 MW oil power plant in Uusimaa, Finland, commissioned in 1974.
Who operates Kellosaari?
Kellosaari is operated by Helsingin Energia.