Porsi is a 282 MW hydro power station in Norrbotten, Sweden. It is operated by 100% Vattenfall. Based on reported annual generation of 639 GWh, it can supply roughly 182k homes. It ranks #20 of 178 Sweden power plants by installed capacity. Commissioned in 1967, it is around 59 years old — an older, legacy facility. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, hydro supplies about 40.0% of Sweden's electricity; the national grid averages 35 gCO₂/kWh (98.8% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id WRI1002108.
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 · L100000603456; fuel: WRI GPPD
In context: how this plant compares
At 282 MW, Porsi is well above the median hydro plant in Sweden (35 MW). Technically it is described as conventional storage. Hydropower converts the energy of falling or flowing water into electricity; output depends on rainfall and reservoir level, and large dams also provide grid balancing and storage.
Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.
Key facts
- Load factor
- 26%, from 639 GWh of reported generation; the median for 15 hydro plants in Sweden that report generation is 40%
- Share of Sweden hydro capacity
- 2.2% of 12,709 MW across 142 plants in this dataset
- Age among peers
- 82 of 136 dated hydro plants in Sweden are older
Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).
Reported generation trend
Annual generation (GWh), WRI Global Power Plant Database (CC BY 4.0).
Owner
Operated by 100% Vattenfall. All plants by this company →
Local climate & thermal context
This hydro plant converts the energy of falling or flowing water through hydro turbines. It sits in a subarctic (boreal) climate (Köppen Dfc) — Northern Hemisphere, latitude 66.4°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 155% 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: 99/100 — 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 mild atmospheric environment (estimated ISO 9223 class C2 — Low), 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 #12 largest hydro power plant of 142 in Sweden by capacity.
Sweden has 142 hydro power plants in this dataset, together about 12,709 MW of capacity.
Nearby power plants
Location
Coordinates 66.4288, 20.6518 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is Porsi?
Porsi is a 282 MW hydro power plant in Norrbotten, Sweden, commissioned in 1967.
How much electricity does Porsi generate?
Porsi generates about 639 GWh of electricity per year.
Who operates Porsi?
Porsi is operated by 100% Vattenfall.