Waiau Hydro
Hydro power plant in Hawaii County, Hawaii. 1 MW of nameplate capacity across 2 generators, operated by Hawaii Electric Light Co Inc.
Also known as EIA plant 774
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 1 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- December 1921First generator online
- Operator
- Hawaii Electric Light Co IncEIA operator ID 8287
- Grid
- Not reported
- Price nodes
- None linkedNo verified ISO node
- Location
- Hawaii County, HI19.7203, −155.1189
- EIA plant ID
- 774EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Waiau Hydro produces
Free · EIA-923Net generation, 2025
0 MWh
0 MWh, final
Capacity factor, 2025
0.0%
2024: 0.0%
January to July 2026
0 MWh
Provisional
Range, 2015 to 2025
0.0–6.0
GWh a year. Low 2019, high 2015
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 0 | Not reported | 12 of 12 |
| 2001 | 5,259 | Not reported | 12 of 12 |
| 2002 | 464 | Not reported | 12 of 12 |
| 2003 | 2,124 | Not reported | 12 of 12 |
| 2004 | 6,277 | Not reported | 12 of 12 |
| 2005 | 3,626 | Not reported | 12 of 12 |
| 2006 | 6,764 | Not reported | 12 of 12 |
| 2007 | 6,423 | Not reported | 12 of 12 |
| 2008 | 5,815 | Not reported | 12 of 12 |
| 2009 | 8,195 | Not reported | 12 of 12 |
| 2010 | 4,630 | 52.9% | 12 of 12 |
| 2011 | 4,142 | 47.3% | 12 of 12 |
| 2012 | 7,930 | 90.3% | 12 of 12 |
| 2013 | 5,128 | 58.5% | 12 of 12 |
| 2014 | 6,795 | 77.6% | 12 of 12 |
| 2015 | 5,972 | 68.2% | 12 of 12 |
| 2016 | 3,377 | 38.4% | 12 of 12 |
| 2017 | 4,251 | 48.5% | 12 of 12 |
| 2018 | 4,326 | 49.4% | 12 of 12 |
| 2019 | 0 | 0.0% | 12 of 12 |
| 2020 | 0 | 0.0% | 12 of 12 |
| 2021 | 0 | 0.0% | 12 of 12 |
| 2022 | 0 | 0.0% | 12 of 12 |
| 2023 | 0 | 0.0% | 12 of 12 |
| 2024 | 0 | 0.0% | 12 of 12 |
| 2025 | 0 | 0.0% | 12 of 12 |
| 2026 (provisional, partial year) | 0 | 0.0% | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Conventional Hydroelectric | 0.7 | December 1921 |
| 2 | Conventional Hydroelectric | 0.3 | December 1928 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Hawaii Electric Light Co Inc as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Power plants near Waiau Hydro
More plants operated by Hawaii Electric Light Co Inc
Questions about Waiau Hydro
How much power does Waiau Hydro produce?
Waiau Hydro reported 0 MWh (0 MWh) of net generation in 2025. From January to July 2026 it reported 0 MWh, which is provisional.
Where is Waiau Hydro?
Waiau Hydro is in Hawaii County, Hawaii, at 19.7203, −155.1189.
Who operates Waiau Hydro?
EIA-860M for August 2026 lists Hawaii Electric Light Co Inc as the operator (EIA operator ID 8287). The operator is not always the owner.
When did Waiau Hydro start operating?
Its first generator began operating in December 1921, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page