Temelín — Czech Republic

Temelín is a 2,164 MW nuclear power station in Jihocesky, Czech Republic. It is operated by CEZ Group. Based on reported annual generation of 15,655 GWh, it can supply roughly 4.5 million homes. It ranks #1 of 481 Czech Republic power plants by installed capacity. Commissioned in 2002, it is around 24 years old — relatively modern. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, nuclear supplies about 42.3% of Czech Republic's electricity; the national grid averages 401 gCO₂/kWh (59.2% low-carbon) (2025).

Plant data: WRI Global Power Plant Database (CC BY 4.0), id WRI1019174.

Data provenance

Source of the capacity and fuel values:

capacity: GEM · 2026 · L100000500096; 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

83%, from 15,655 GWh of reported generation

Generation trend

13,514 GWh in 2015 and 15,655 GWh in 2017 (+16%)

Highest and lowest year

2017: 15,655 GWh; 2016: 11,057 GWh

Share of Czech Republic nuclear capacity

52.0% of 4,164 MW across 2 plants in this dataset

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 CEZ Group. All plants by this company →

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 49.2°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 41% 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: 75/100 — 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 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 #1 largest nuclear power plant of 2 in Czech Republic by capacity.

Czech Republic has 2 nuclear power plants in this dataset, together about 4,164 MW of capacity.

Nearby power plants

• Dívčice Solar Power Plant · Solar · 2.8 MW · Jihocesky
• Stará Obora Solar Power Plant · Solar · 2.8 MW · Jihocesky
• Protivín Solar Power Plant · Solar · 3.2 MW · Jihocesky
• Bežerovice Solar Power Plant · Solar · 3 MW · Jihocesky
• Ševětín Solar Power Plant · Solar · 29.9 MW · Jihocesky
• Borek Solar Power Plant · Solar · 1 MW · Jihocesky

Location

Coordinates 49.1796, 14.3795 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions