Hydro power plant in Guanacaste, Costa Rica. Approximate location 10.4755, -84.9989.
HydroGuanacasteCosta Ricaconventional storage
Arenal Hydroelectric Power Plant Costa Rica is a 158 MW hydro power station in Guanacaste, Costa Rica. It is operated by Instituto Costarricense de Electricidad [100%]. Based on its capacity (estimated), it can supply roughly 158k homes (estimated). It ranks #5 of 27 Costa Rica power plants by installed capacity. Commissioned in 1979, it is around 47 years old — long-established. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, hydro supplies about 74.8% of Costa Rica's electricity; the national grid averages 24 gCO₂/kWh (100.0% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id GEODB0002153.
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 L100000601437); fuel: WRI source-record fuel
At 158 MW, Arenal Hydroelectric Power Plant Costa Rica is well above the median hydro plant in Costa Rica (50 MW). Technically it is described as conventional storage. 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 Instituto Costarricense de Electricidad [100%].
This hydro plant converts the energy of falling or flowing water through hydro turbines. It sits in a tropical savanna climate (Köppen Aw) — Northern Hemisphere, latitude 10.5°N — 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 a corrosive environment (estimated ISO 9223 class C4 — High), 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 #3 largest hydro power plant of 18 in Costa Rica by capacity.
Costa Rica has 18 hydro power plants in this dataset, together about 1,254 MW of capacity.
Coordinates 10.4755, -84.9989 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Arenal Hydroelectric Power Plant Costa Rica is a 158 MW source-record hydro power plant in Guanacaste, Costa Rica, commissioned in 1979.
Its output is enough to supply roughly 157,680 homes (estimated).
Arenal Hydroelectric Power Plant Costa Rica is operated by Instituto Costarricense de Electricidad [100%].
