KOZLODUY is a 2,080 MW nuclear power station in Vratsa, Bulgaria. It is operated by Kozloduy NPP EAD (Bulgarian Energy Holding). Based on reported annual generation of 15,381 GWh, it can supply roughly 4.4 million homes. It ranks #1 of 55 Bulgaria power plants by installed capacity. Commissioned in 1974, it is around 52 years old — an older, legacy facility. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, nuclear supplies about 39.1% of Bulgaria's electricity; the national grid averages 276 gCO₂/kWh (71.9% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id WRI1008053.
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
The capacity and/or fuel fields on this page include a source-backed provenance label from GEM, an official registry, Wikidata, OSM, or a cross-source match.
capacity: GEM tracker 2026 operating-unit sum (location L100000500097); fuel: WRI source-record fuel
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.
Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).
Operated by Kozloduy NPP EAD (Bulgarian Energy Holding).
This nuclear plant uses heat from nuclear fission to raise steam for a turbine-generator. It sits in a humid subtropical climate (Köppen Cfa) — Northern Hemisphere, latitude 43.7°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 10% 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: 55/100 — 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.
For a plant’s outdoor hardware — heat-recovery steam generators (HRSG), expansion joints, valves, flanges and their insulation — the local climate sets how fast unprotected steel and coatings degrade. This site sits in a mild atmospheric environment (estimated ISO 9223 class C2 — Low), with humidity / wetness the leading environmental stress.
Higher environmental severity is exactly where protective removable insulation pays back most: a sheltered micro-climate slows corrosion, UV and thermal-cycling damage and extends outdoor hardware service life. This is an indicative site-climate context — not a condition assessment of any specific plant or operator.
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.
The #1 largest nuclear power plant of 2 in Bulgaria by capacity.
Bulgaria has 2 nuclear power plants in this dataset, together about 4,080 MW of capacity.
Coordinates 43.7438, 23.7723 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
KOZLODUY is a 2,080 MW source-record nuclear power plant in Vratsa, Bulgaria, commissioned in 1974.
KOZLODUY generates about 15,381 GWh of electricity per year.
Its output is enough to supply roughly 4,394,514 homes.
KOZLODUY is operated by Kozloduy NPP EAD (Bulgarian Energy Holding).
