HNL Emergency Power Facility — United 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 #5654 of 10,884 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.

Data provenance

Source of the capacity and fuel values:

capacity: Wikidata P2109; fuel: WRI GPPD

In context: how this plant compares

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.

Key facts

Load factor

1%, from 1 GWh of reported generation; the median for 14 other plants in United States of America that report generation is 50%

Share of United States of America other capacity

1.5% of 681 MW across 19 plants in this dataset

Age among peers

14 of 16 dated other plants in United States of America are older

Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).

Reported generation trend

Annual generation (GWh), WRI Global Power Plant Database (CC BY 4.0).

Owner

Operated by Hawaiian Electric Co Inc.

Local climate & thermal context

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.

Site climate & environmental severity

This site sits in an aggressive, high-corrosion environment (estimated ISO 9223 class C5 — Very high), with marine salt corrosion the leading environmental stress.

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.

How it compares & nearby plants

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.

Nearby power plants

• Pearl City Peninsula Solar Park · Solar · 1 MW · Hawaii
• Waiau · Oil · 474.6 MW · Hawaii
• West Loch Solar One · Solar · 20 MW · Hawaii
• Kalaeloa Renewable Energy Park · Solar · 5 MW · Hawaii
• Waipio Solar · Solar · 45.9 MW · Hawaii
• Lanikuhana Solar LLC · Solar · 14.7 MW · Hawaii

Location

Coordinates 21.3364, -157.9194 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions