Mertaniemi 1 ja 2 is a 102 MW other power station in South Karelia, Finland. It is operated by Lappeenrannan Lämpövoima Oy. Based on its capacity (estimated), it can supply roughly 77k homes (estimated). It ranks #42 of 203 Finland power plants by installed capacity. In context, the national grid averages 57 gCO₂/kWh (96.3% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id WRI1002455.
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 · L100000407829; fuel: WRI GPPD
In context: how this plant compares
This facility converts its energy source into electricity for the grid; its capacity, fuel type and location determine its role in the national power mix.
Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.
Key facts
- Share of Finland other capacity
- 36.1% of 282 MW across 4 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 other plants in Finland
Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).
Owner
Operated by Lappeenrannan Lämpövoima Oy.
Local climate & thermal context
This other plant generates electricity for the grid. It sits in a warm-summer humid continental climate (Köppen Dfb) — Northern Hemisphere, latitude 61.1°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 108% 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: 95/100 — 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 #1 largest other power plant of 4 in Finland by capacity.
Finland has 4 other power plants in this dataset, together about 282 MW of capacity.
Nearby power plants
- Lappeenranta Kaukaan tehdas · Biomass · 119 MW · South Karelia
- Lappeenranta TG9 · Biomass · 67.3 MW · South Karelia
- Lappeenranta kombi · Gas · 26.3 MW · South Karelia
- Sunila · Biomass · 35.7 MW · South Karelia
- Joutseno · Biomass · 85 MW · South Karelia
- Kaarni · Hydro · 1.2 MW · South Karelia
Location
Coordinates 61.0587, 28.1887 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is Mertaniemi 1 ja 2?
Mertaniemi 1 ja 2 is a 102 MW other power plant in South Karelia, Finland.
Who operates Mertaniemi 1 ja 2?
Mertaniemi 1 ja 2 is operated by Lappeenrannan Lämpövoima Oy.