Olkiluoto Reserve power station — Finland

Olkiluoto Reserve power station is a 100 MW oil power station in , Finland. It is operated by Fingrid Oyj. Based on its capacity (estimated), it can supply roughly 75k homes (estimated). It ranks #45 of 203 Finland power plants by installed capacity. Its annual emissions of 1,522 t CO₂/yr (EU ETS verified (EUTL 2023)) are equivalent to about 355 cars driven for a year. 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 GOGPT_olkiluotoreserve_finlan.

Data provenance

Source of the capacity and fuel values:

capacity: GEM · 2026 · L100001000057; fuel: GEM GOGPT

In context: how this plant compares

At 100 MW, Olkiluoto Reserve power station 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.

1,522 t CO₂/yr — in everyday terms

This facility's annual emissions are roughly equivalent to:

Equivalencies via US EPA Greenhouse Gas Equivalencies; emissions per EU ETS verified (EUTL 2023) (measured for US EPA/EU ETS, modelled for Climate TRACE).

Key facts

Share of Finland oil capacity

6.9% of 1,442 MW across 17 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 oil plants in Finland

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

Owner

Operated by Fingrid Oyj.

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 61.2°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 97% 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: 93/100 — 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 #6 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

• Olkiluoto 1 · Nuclear · 1,760 MW · Satakunta
• Olkiluoto kt · Other · 100.5 MW · Satakunta
• Olkiluoto tv · Wind · 1 MW · Satakunta
• Jalasjoki/Niiles · Hydro · 1 MW · Satakunta
• Rauma · Biomass · 71.5 MW · Satakunta
• Rauma · Biomass · 75 MW · Satakunta

Location

Coordinates 61.23957, 21.44796 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions