Other power plant in Hawaii, United States of America. Approximate location 21.3364, -157.9194.
OtherHawaiiUnited States of America
HNL Emergency Power Facility is a 10 MW other power plant in Hawaii, United States of America. It is operated by Hawaiian Electric Co Inc. Based on reported annual generation of 1 GWh, it can supply roughly 200 homes. It ranks #5708 of 10,938 United States of America power plants by installed capacity. Commissioned in 2017, it is around 9 years old — relatively modern. In context, the national grid averages 384 gCO₂/kWh (43.0% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id USA0058469.
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: Wikidata P2109 nameplate capacity; fuel: WRI source-record fuel
At 10 MW, HNL Emergency Power Facility is below the median other plant in United States of America (22 MW). This facility converts its energy source into electricity for the grid; its capacity, fuel type and location determine its role in the national power mix.
Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.
Annual generation (GWh), WRI Global Power Plant Database (CC BY 4.0).
Operated by Hawaiian Electric Co Inc.
This other plant generates electricity for the grid. It sits in a tropical savanna climate (Köppen As) — Northern Hemisphere, latitude 21.3°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 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 #16 largest other power plant of 19 in United States of America by capacity.
United States of America has 19 other power plants in this dataset, together about 681 MW of capacity.
Coordinates 21.3364, -157.9194 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
HNL Emergency Power Facility is a 10 MW source-record other power plant in Hawaii, United States of America, commissioned in 2017.
HNL Emergency Power Facility generates about 1 GWh of electricity per year.
Its output is enough to supply roughly 200 homes.
HNL Emergency Power Facility is operated by Hawaiian Electric Co Inc.
