Wailuku River Hydroelectric
Hawaii County, Hawaii · EIA plant ID 54827 · Operator: Wailuku Holding Company LLC
Nameplate10MWSummer 10 MW
Generators2in service
Net generation33GWh12 mo to Aug 2026
Capacity factor39%hydro units, summer MW
Heat rate—thermal plants only
First online1993
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), hydro units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 32.2 | 37.1% | — |
| 2002 | 26.3 | 30.4% | — |
| 2003 | 23 | 26.6% | — |
| 2004 | 24.3 | 28.0% | — |
| 2005 | 33.4 | 38.6% | — |
| 2006 | 31.5 | 36.4% | — |
| 2007 | 27.3 | 31.8% | — |
| 2008 | 17.9 | 20.8% | — |
| 2009 | 30.7 | 35.8% | — |
| 2010 | 11.9 | 13.9% | — |
| 2011 | 24.6 | 28.6% | — |
| 2012 | 26.9 | 31.3% | — |
| 2013 | 15.1 | 17.6% | — |
| 2014 | 18.2 | 21.2% | — |
| 2015 | 40.9 | 47.6% | — |
| 2016 | 36.3 | 42.1% | — |
| 2017 | 19.5 | 22.7% | — |
| 2018 | 42.4 | 49.4% | — |
| 2019 | 24 | 27.9% | — |
| 2020 | 23.2 | 27.0% | — |
| 2021 | 34.1 | 39.7% | — |
| 2022 | 43.4 | 50.6% | — |
| 2023 | 20.3 | 23.7% | — |
| 2024 | 29.9 | 34.7% | — |
| 2025 | 14.1 | 16.4% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 8101 | Conventional Hydroelectric | HY | 5.2 | 4.9 | May 1993 | Operating | — | coming soon |
| 8102 | Conventional Hydroelectric | HY | 5.2 | 4.9 | May 1993 | Operating | — | coming soon |
Owner / operator
Operator: Wailuku Holding Company LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Wailuku Holding Company LLC | 100.0% | 10 MW |
Nearby plants
Within 80 km.
| Waiau Hydro | 1 MW | 3.2 km |
| Puueo | 3 MW | 6.2 km |
| Kanoelehua | 21 MW | 9.1 km |
| W H Hill | 37 MW | 9.3 km |
| Puna | 39 MW | 15.3 km |
| Hu Honua Bioenergy Facility | — | 15.9 km |