Keahole — United States of America
Oil power plant in Hawaii, United States of America. Approximate location 19.7317, -156.0283.
OilHawaiiUnited States of AmericaCCGT · HRSGCO₂ modelled
Keahole is a 89.1 MW oil power plant in Hawaii, United States of America. It is operated by Hawaii Electric Light Co Inc. Based on reported annual generation of 302 GWh, it can supply roughly 86k homes. It ranks #2946 of 10,884 United States of America power plants by installed capacity. Commissioned in 2000, it is around 26 years old — long-established. Its modelled annual emissions are 51,515 t CO₂/yr (Climate TRACE), equivalent to about 12k cars driven for a year. In context, oil supplies about 0.7% of United States of America's electricity; the national grid averages 384 gCO₂/kWh (43.0% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id USA0008083.
Data status
Known data
Modelled source data
Calculated from dataset
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
Capacity provenance
The public capacity above is the current source-record value. A 2026 tracker candidate lists 64 MW for Keahole power station, but it is not used as the public primary value until scope is verified (unit vs operating vs installed/project total).
Data provenance
Source of the capacity and fuel values:
capacity: Wikidata P2109; fuel: WRI GPPD
In context: how this plant compares
At 89.1 MW, Keahole is well above the median oil plant in United States of America (7.2 MW). Technically it is described as CCGT; combined-cycle with a heat-recovery steam generator (HRSG). Oil-fired plants burn heavy fuel oil or diesel, usually as peaking or backup capacity on islands and grids without gas pipelines; high fuel cost keeps their utilisation low.
Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.
~51,515 t CO₂/yr (modelled) — in everyday terms
This facility's annual emissions are roughly equivalent to:
Equivalencies via US EPA Greenhouse Gas Equivalencies; modelled emissions from Climate TRACE.
Key facts
- Load factor
- 39%, from 302 GWh of reported generation; the median for 469 oil plants in United States of America that report generation is 0%
- Generation trend
- 261 GWh in 2013 and 302 GWh in 2019 (+16%)
- Highest and lowest year
- 2018: 349 GWh; 2013: 261 GWh
- Share of United States of America oil capacity
- 0.2% of 40,022 MW across 902 plants in this dataset
- Age among peers
- 527 of 877 dated oil 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 Hawaii Electric Light Co Inc.
Local climate & thermal context
This oil plant burns oil or diesel to drive turbines or reciprocating engines. It sits in a tropical rainforest climate (Köppen Af) — Northern Hemisphere, latitude 19.7°N — which shapes how much energy it can produce and how its output varies through the year.
Monthly mean temperature
Heating degree-days here run 98% 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: 14/100 — 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.
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 #70 largest oil power plant of 902 in United States of America by capacity.
United States of America has 902 oil power plants in this dataset, together about 40,022 MW of capacity.
Nearby power plants
- Waimea · Oil · 7.5 MW · Hawaii
- Hawi Wind Farm · Wind · 10.6 MW · Hawaii
- Hamakua Energy Plant · Oil · 66 MW · Hawaii
- Pakini Nui Wind Farm · Wind · 21 MW · Hawaii
- Wailuku River Hydroelectric · Hydro · 10.4 MW · Hawaii
- Waiau Hydro · Hydro · 1 MW · Hawaii
Location
Coordinates 19.7317, -156.0283 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is Keahole?
Keahole is a 89.1 MW oil power plant in Hawaii, United States of America, commissioned in 2000.
How much electricity does Keahole generate?
Keahole generates about 302 GWh of electricity per year.
Who operates Keahole?
Keahole is operated by Hawaii Electric Light Co Inc.
How much CO₂ does Keahole emit?
Keahole has modelled emissions of about 51,515 tonnes of CO₂ per year (Climate TRACE).