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374.6 MW Residual Oil operating in Honolulu, HI
Outside CONUS — spatial-market dimensions not provided by this dataset.
374.6 MW
Nameplate Capacity
6
Generators
units
Petroleum Liquids
Technology
1959
Operating Since
Coordinates
21.3890, -157.9615
County
Honolulu, HI
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Hawaiian Electric Co Inc | Hawaiian Electric Company | — |
| Owner(s) | Hawaiian Electric Co Inc | Hawaiian Electric Industries | — |
| Status | Operating | — | — |
The Waiau power plant, located in Honolulu County, Hawaii, has a total capacity of 474.6 MW. The plant began operating in 1947 and utilizes residual fuel oil (RFO) as its primary fuel source, employing petroleum liquid technologies across its eight generators. It is owned by Hawaiian Electric Industries and operated by Hawaiian Electric Co Inc.
In the most recent year with available data, Waiau generated 971,800 MWh of electricity, achieving a capacity factor of 23.4%. The plant is the second-largest of three power plants in the state of Hawaii, and ranks fifth out of six nationally. Waiau operates within the balancing authority of Hawaiian Electric Co Inc.
Generated from EIA, GEM, and public data sources
Grid Region
—
Market
—
NERC Region
—
Balancing Authority
—
Grid Voltage
138.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
117.5K MWh
Latest Month
971.8K MWh
Annual Generation
23.4%
Capacity Factor
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CO₂ Intensity
1856 lb/MWh
NOx
3 lb/MWh
SO₂
5 lb/MWh
CH₄
0.075 lb/MWh
N₂O
0.015 lb/MWh
Capacity Factor
30.9%
Annual Net Gen
1284 GWh
CO₂eq
1862 lb/MWh
Subregion
HICC Oahu
2013
$765/kW
Est. Construction Cost
Total estimated cost: $362.9M
Forward revenue, DSCR bands, and refinancing risk projected under price, demand, and policy scenarios. Powered by InfraSure's asset cashflow stack.
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This plant is in a bilateral market territory without organized wholesale pricing. Nodal pricing data is not available.
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
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