Waiau — Plant Summary
- EIA Plant ID
- 766
- Capacity
- 474.6 MW
- Primary Fuel
- RFO
- Technology
- Petroleum Liquids
- Status
- Operating
- Location
- Honolulu, HI
- Operating Since
- 1947
- Generators
- 8
- Operator
- Hawaiian Electric Co Inc
- Parent Company
- Hawaiian Electric Industries
- Annual Generation
- 971,800 MWh
- Capacity Factor
- 23.4%
- Balancing Authority
- —
- ISO/RTO
- —
- NERC Region
- —
Waiau
OperatingDistillate OilResidual Oil
Ranked #2 of 5 Residual Oil plants in HI#8 of 13 nationally
474.6 MW Residual Oil operating in Honolulu, HI
EIAWD
474.6 MW
Nameplate Capacity
8
Generators
units
Petroleum Liquids
Technology
1947
Operating Since
Location
Coordinates
21.3890, -157.9615
County
Honolulu, HI
Nearby Plants
- Waiawa Solar Power HybridBESS72 MW · 3.6 km
- Waipio PeninsulaSolar11 MW · 3.8 km
- Puuloa EnergyBio. Liquids103.4 MW · 4.7 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Hawaiian Electric Co Inc | Hawaiian Electric Company | — |
| Owner(s) | Hawaiian Electric Co Inc | Hawaiian Electric Industries | — |
| Status | Operating | — | — |
Ownership Chain
About
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
Engineering & Generators
Grid Context
NERC Region
—
Balancing Authority
—
Grid Voltage
138 kV
Regulatory Status
RE
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Generation
117.5K MWh
Latest Month
971.8K MWh
Annual Generation
23.4%
Capacity Factor
Jan 2023 – Dec 2025
Financial Data
No financial data available for this plant.
Pricing & Market Data
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
News & Articles (10)Beta
General
Waiau power plant Biofuel project approved
STAR-ADVERTISER / 2023. Redevelopment of the Hawaiian Electric Waiau Power Plant was proposed to start up in three phases from 2029 to 2033.
Honolulu Star-Advertiser·Yesterday
Hazards·flooding
Flash Flood Warning: Oahu in Honolulu, HI
Flash Flood Warning issued March 21 at 8:40AM HST until March 21 at 11:00AM HST by NWS Honolulu HI
Flash Flood Warning (hazard)
NWS Honolulu HI·5 days ago
Hazards·flooding
Flood Watch: Waianae Coast; Oahu North Shore; Olomana; Central Oahu; Waianae Mountains; Lanai Mauka; Kahoolawe; M
Flood Watch issued March 21 at 3:53AM HST until March 22 at 6:00PM HST by NWS Honolulu HI
Flood Watch (hazard)
NWS Honolulu HI·5 days ago
General
Japan energy giant proposes LNG-fired power plant for Oahu
The largest energy company in Japan is proposing to develop a power plant on Oahu run on liquefied natural gas that cuts the cost to make...
Honolulu Star-Advertiser·1 weeks ago
Last updated 2026-03-26
View all 10 articles