Search
Search plants, projects, owners, and states
Search plants, projects, owners, and states
474.6 MW Residual Oil operating in Honolulu, HI
474.6 MW
Nameplate Capacity
8
Generators
units
Petroleum Liquids
Technology
1947
Operating Since
Coordinates
21.3890, -157.9615
County
Honolulu, HI
Nearby Plants
| 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
117.5K MWh
Latest Month
971.8K MWh
Annual Generation
23.4%
Capacity Factor
CO₂ Intensity
1856 lb/MWh
NOx
3 lb/MWh
SO₂
2013
$765/kW
Est. Construction Cost
Total estimated cost: $362.9M
This plant is in a bilateral market territory without organized wholesale pricing. Nodal pricing data is not available.
Last updated 2026-03-26
View all 6 articlesNo ask pi reports yet for this entity.
ask pi about Waiau—
Grid Voltage
138.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
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