Waiau
Honolulu County, Hawaii · EIA plant ID 766 · Operator: Hawaiian Electric Co Inc
×100 MW oil retired since 2020 (latest Dec 2024)
Nameplate375MWSummer 362 MW
Generators6in service
Net generation1,049GWh12 mo to Aug 2026
Capacity factor33%gas/coal/oil units, summer MW
Heat rate12,021Btu/kWhfossil units, electric fuel, HHV
First online1959Runs as intermediate
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), gas/coal/oil 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.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 1,192.2 | — | — |
| 2002 | 1,316.5 | — | — |
| 2003 | 1,204.2 | 30.1% | 11,148 |
| 2004 | 1,276.5 | 31.8% | 11,472 |
| 2005 | 1,324.7 | 33.1% | 11,589 |
| 2006 | 1,310.8 | 32.8% | 11,273 |
| 2007 | 1,342.7 | 33.6% | 11,459 |
| 2008 | 1,243.4 | 31.0% | 10,960 |
| 2009 | 1,389.6 | 34.7% | 10,999 |
| 2010 | 1,137.7 | 28.4% | 10,937 |
| 2011 | 1,023.3 | 25.6% | 10,760 |
| 2012 | 1,041.5 | 26.0% | 10,096 |
| 2013 | 1,035.9 | 25.9% | 10,697 |
| 2014 | 1,044.9 | 26.1% | 11,064 |
| 2015 | 1,191 | 29.8% | 11,098 |
| 2016 | 912.9 | 22.8% | 11,338 |
| 2017 | 912.2 | 22.8% | 11,579 |
| 2018 | 983.9 | 24.6% | 11,312 |
| 2019 | 1,002.2 | 25.1% | 11,084 |
| 2020 | 736.9 | 18.4% | 11,257 |
| 2021 | 891.6 | 22.3% | 11,240 |
| 2022 | 904.8 | 22.6% | 11,627 |
| 2023 | 1,283.6 | 32.1% | 11,376 |
| 2024 | 991.3 | 24.7% | 11,650 |
| 2025 | 974.8 | 30.8% | 11,692 |
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 |
|---|---|---|---|---|---|---|---|---|
| W10 | Petroleum Liquids | GT | 51.3 | 51.2 | Dec 1973 | Operating | — | coming soon |
| W5 | Petroleum Liquids | ST | 54.4 | 51.9 | Sep 1959 | Operating | — | coming soon |
| W6 | Petroleum Liquids | ST | 54.4 | 51.8 | Jun 1961 | Operating | — | coming soon |
| W7 | Petroleum Liquids | ST | 81.6 | 77.8 | Oct 1966 | Operating | — | coming soon |
| W8 | Petroleum Liquids | ST | 81.6 | 77.8 | Nov 1968 | Operating | — | coming soon |
| W9 | Petroleum Liquids | GT | 51.3 | 51.2 | Jun 1973 | Operating | — | coming soon |
| W3 | Petroleum Liquids | ST | 50 | 47.2 | Dec 1947 | Retired Dec 2024 | — | coming soon |
| W4 | Petroleum Liquids | ST | 50 | 47.7 | Oct 1950 | Retired Dec 2024 | — | coming soon |
Owner / operator
Operator: Hawaiian Electric Co Inc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Hawaiian Electric Co Inc | 100.0% | 375 MW |
Nearby plants
Within 80 km.
| Pearl City Peninsula Solar Park | 1 MW | 1.6 km |
| Waiawa Solar Power Hybrid | 72 MW | 3.6 km |
| Waipio Peninsula | 11 MW | 3.8 km |
| Puuloa Energy | — | 4.7 km |
| AES Waiawa Phase 2 Solar | — | 4.9 km |
| Puuloa Solar | — | 5.5 km |