Krsko (NEK) — Slovenia

Krsko (NEK) is a 727 MW nuclear power station in Krsko, Slovenia. It is operated by Hrvatska elektroprivreda dd [50%]; GEN energija doo [50%]. Based on reported annual generation of 5,959 GWh, it can supply roughly 1.7 million homes. It ranks #2 of 10 Slovenia power plants by installed capacity. Commissioned in 1983, it is around 43 years old — long-established. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, nuclear supplies about 39.3% 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 WRI1022414.

Data provenance

Source of the capacity and fuel values:

capacity: GEM · 2026 · L100000500165; fuel: WRI GPPD

In context: how this plant compares

Technically it is described as pressurized water reactor. Nuclear plants split uranium to raise steam with no direct CO₂; they run as steady baseload with very high capacity factors and the longest operating lifetimes of any thermal plant.

Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.

Key facts

Load factor

94%, from 5,959 GWh of reported generation

Generation trend

5,362 GWh in 2015 and 5,959 GWh in 2017 (+11%)

Highest and lowest year

2017: 5,959 GWh; 2015: 5,362 GWh

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 Hrvatska elektroprivreda dd [50%]; GEN energija doo [50%].

Local climate & thermal context

This nuclear plant uses heat from nuclear fission to raise steam for a turbine-generator. It sits in a temperate oceanic climate (Köppen Cfb) — Northern Hemisphere, latitude 45.9°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 21% 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: 62/100 — 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

Slovenia has 1 nuclear power plant in this dataset, together about 727 MW of capacity.

Nearby power plants

• Brestanica (TEB) · Gas · 337 MW · Krsko
• Ozalj Hydroelectric Power Plant Croatia Croatia · Hydro · 5.5 MW · Karlovacka
• Zagreb El-To CHP Power Plant Croatia · Gas · 86.8 MW · Grad Zagreb
• TET · Coal · 110 MW · Hrastnik
• Zagreb Te-To CHP Power Plant Croatia · Gas · 328 MW · Grad Zagreb
• Jertovec CCGT Power Plant Croatia · Gas · 78 MW · Krapinsko-Zagorska

Location

Coordinates 45.9389, 15.516 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions