HE Formin is a 116 MW hydro power station in Zavrc, Slovenia. It is operated by Dravske Elektrarne Maribor (DEM) [100%]. Based on its capacity (estimated), it can supply roughly 116k homes (estimated). It ranks #5 of 10 Slovenia power plants by installed capacity. Commissioned in 1978, it is around 48 years old — long-established. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, hydro supplies about 27.2% of Slovenia's electricity; the national grid averages 183 gCO₂/kWh (78.9% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id WRI1022416.
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 · L100000603312; fuel: WRI GPPD
In context: how this plant compares
Technically it is described as run-of-river. 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
- Share of Slovenia hydro capacity
- 28.2% of 412 MW across 3 plants in this dataset
- Age among peers
- 1 of 3 dated hydro plants in Slovenia is older
Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).
Capacity vs largest hydro plants in Slovenia
Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).
Owner
Operated by Dravske Elektrarne Maribor (DEM) [100%].
Local climate & thermal context
This hydro plant converts the energy of falling or flowing water through hydro turbines. It sits in a temperate oceanic climate (Köppen Cfb) — Northern Hemisphere, latitude 46.4°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 27% 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: 66/100 — this site sits in the mid 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 humidity / wetness 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 #2 largest hydro power plant of 3 in Slovenia by capacity.
Slovenia has 3 hydro power plants in this dataset, together about 412 MW of capacity.
Nearby power plants
- Varazdin Hydroelectric Power Plant Croatia Croatia · Hydro · 95 MW · Varazdinska
- HE Zlatoličje · Hydro · 116 MW · Starse
- Cakovec Hydroelectric Power Plant Croatia Croatia · Hydro · 77 MW · Medimurska
- Jertovec CCGT Power Plant Croatia · Gas · 78 MW · Krapinsko-Zagorska
- Weissenegg · Hydro · 1 MW · Styria
- Retznei · Hydro · 1 MW · Styria
Location
Coordinates 46.4026, 16.0339 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is HE Formin?
HE Formin is a 116 MW hydro power plant in Zavrc, Slovenia, commissioned in 1978.
Who operates HE Formin?
HE Formin is operated by Dravske Elektrarne Maribor (DEM) [100%].