Ahvenkoski is a 24 MW hydro power plant in Kymenlaakso, Finland. It is operated by Oy Mankala Ab. Based on reported annual generation of 184 GWh, it can supply roughly 52,457 homes. It ranks #88 of 185 Finland power plants by installed capacity. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, hydro supplies about 15.1% 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 WRI1002305.
Annual generation (GWh), WRI Global Power Plant Database (CC BY 4.0).
Operated by Oy Mankala Ab. All plants by this company →
This hydro plant converts the energy of falling or flowing water through hydro turbines. It sits in a warm-summer humid continental climate (Köppen Dfb) — Northern Hemisphere, latitude 60.5°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 99% 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.
In colder climates, uninsulated hot equipment (boilers, turbines, valves, steam lines) loses proportionally more heat to ambient air — exactly the loss Inzonex modular insulation is designed to cut.
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.
The #32 largest hydro power plant of 95 in Finland by capacity.
Finland has 95 hydro power plants in this dataset, together about 2,382 MW of capacity.
Coordinates 60.5, 26.5 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
