Hydro power plant in San Juan, Argentina. Approximate location -31.4557, -68.7556.
HydroSan JuanArgentinaunknown
ULLUM is a 42 MW hydro power plant in San Juan, Argentina. It is operated by AES ARGENTINA GENERACION S.A.. Based on its capacity (estimated), it can supply roughly 42k homes (estimated). It ranks #122 of 275 Argentina power plants by installed capacity. Commissioned in 2016, it is around 10 years old — relatively modern. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, hydro supplies about 17.1% of Argentina's electricity; the national grid averages 346 gCO₂/kWh (41.6% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id ARG0000290.
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 (location L100001054533); fuel: WRI source-record fuel
At 42 MW, ULLUM is around the median hydro plant in Argentina (42 MW). Technically it is described as unknown. 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.
Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).
Operated by AES ARGENTINA GENERACION S.A.. All plants by this company →
This hydro plant converts the energy of falling or flowing water through hydro turbines. It sits in a cold desert climate (Köppen BWk) — Southern Hemisphere, latitude 31.5°S — 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% below 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: 33/100 — this site sits in the bottom 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 benign, low-corrosion environment (estimated ISO 9223 class C1 — Very low), with dust abrasion 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 #25 largest hydro power plant of 50 in Argentina by capacity.
Argentina has 50 hydro power plants in this dataset, together about 9,991 MW of capacity.
Coordinates -31.4557, -68.7556 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
ULLUM is a 42 MW source-record hydro power plant in San Juan, Argentina, commissioned in 2016.
Its output is enough to supply roughly 42,048 homes (estimated).
ULLUM is operated by AES ARGENTINA GENERACION S.A..
