Geothermal power plant in Guanacaste, Costa Rica. Approximate location 10.7002, -85.1944.
GeothermalGuanacasteCosta Rica
Miravalles I and II Geothermal Power Plant Costa Rica is a 115 MW geothermal power station in Guanacaste, Costa Rica. Based on its capacity (estimated), it can supply roughly 216k homes (estimated). It ranks #8 of 27 Costa Rica power plants by installed capacity. As a non-combustion source, it has no direct CO₂ emissions from generation. In context, geothermal supplies about 11.9% 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 GEODB0004310.
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
At 115 MW, Miravalles I and II Geothermal Power Plant Costa Rica is well above the median geothermal plant in Costa Rica (28 MW). Geothermal plants tap underground heat to raise steam for a turbine; they provide steady, low-carbon baseload but are limited to geologically active regions.
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).
This geothermal plant taps underground heat to raise steam that drives a turbine. It sits in a tropical savanna climate (Köppen Aw) — Northern Hemisphere, latitude 10.7°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 #1 largest geothermal power plant of 5 in Costa Rica by capacity.
Costa Rica has 5 geothermal power plants in this dataset, together about 199 MW of capacity.
Coordinates 10.7002, -85.1944 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Miravalles I and II Geothermal Power Plant Costa Rica is a 115 MW source-record geothermal power plant in Guanacaste, Costa Rica.
Its output is enough to supply roughly 215,871 homes (estimated).
