Nuclear power plant in Rio de Janeiro, Brazil. Approximate location -23.0087, -44.4574.
NuclearRio de JaneiroBrazilPRE KONVOIpressurized water reactor
Almirante Álvaro Alberto - Unidade I (Antiga Angra I) is a 640 MW nuclear power station in Rio de Janeiro, Brazil. It is operated by Eletrobras Eletronuclear SA [100%]. Based on its capacity (estimated), it can supply roughly 1.4 million homes (estimated). It ranks #78 of 2,572 Brazil power plants by installed capacity. Commissioned in 1985, it is around 41 years old — long-established. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, nuclear supplies about 2.1% of Brazil's electricity; the national grid averages 110 gCO₂/kWh (88.7% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id BRA0000100.
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
The capacity and fuel fields on this page are source-record values from the upstream open dataset. They are useful for identification and ranking, but they have not been upgraded to a 2026 registry/GEM-location verified value.
capacity: WRI Global Power Plant Database source-record (legacy); 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 Eletrobras Eletronuclear SA [100%].
This nuclear plant uses heat from nuclear fission to raise steam for a turbine-generator. It sits in a humid subtropical climate (Köppen Cfa) — Southern Hemisphere, latitude 23.0°S — which shapes how much energy it can produce and how its output varies through the year.
Monthly mean temperature
This site has effectively no heating season (tropical/equatorial climate), so winter heat loss is not the driver here. The thermal concern shifts to year-round process heat and humidity/heat-driven corrosion of hot equipment.
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 an aggressive, high-corrosion environment (estimated ISO 9223 class C5 — Very high), with marine salt corrosion 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 #2 largest nuclear power plant of 2 in Brazil by capacity.
Brazil has 2 nuclear power plants in this dataset, together about 1,990 MW of capacity.
Coordinates -23.0087, -44.4574 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Almirante Álvaro Alberto - Unidade I (Antiga Angra I) is a 640 MW source-record nuclear power plant in Rio de Janeiro, Brazil, commissioned in 1985.
Its output is enough to supply roughly 1,441,645 homes (estimated).
Almirante Álvaro Alberto - Unidade I (Antiga Angra I) is operated by Eletrobras Eletronuclear SA [100%].
