Power plant · EIA plant code 766
Waiau
- Operator
- Hawaiian Electric Co Inc
- Location
- Honolulu, HI (county level only)
- Balancing authority
- Not reported
- Nameplate capacity
- 374.6 MW
- Summer capacity
- 361.7 MW
U.S. Energy Information Administration · Annual Electric Generator Report (Form EIA-860) · data for 2025 · as of Sep 10, 2026 · retrieved Oct 31, 2026 · CC-BY-4.0 May be out of date. The next release was due by Sep 10, 2027. Last checked for an update: Oct 31, 2026.
Generation in 2025
- Net generation
- 974,784 MWh
- Capacity factor
- 29.7%
Capacity factor is net generation divided by nameplate capacity times the hours each generator was in service that year, counted by month.
U.S. Energy Information Administration · Power Plant Operations Report (Form EIA-923) · data for 2025 · as of Sep 11, 2026 · retrieved Oct 31, 2026 · CC-BY-4.0 May be out of date. The next release was due by Sep 11, 2027. Last checked for an update: Oct 31, 2026.
Emissions
- Carbon dioxide in 2023
- 1,080,853 metric tons
- Carbon dioxide per MWh
- 1,856 lb/MWh
eGRID reports 1,191,436 short tons. One short ton is 0.90718474 metric tons.
Emissions are for 2023, the newest eGRID year. Generation is for 2025, the newest EIA-923 year.
U.S. Environmental Protection Agency · Emissions & Generation Resource Integrated Database (eGRID) · data for 2023 · as of Jun 16, 2025 · retrieved Oct 31, 2026 · CC-BY-4.0 May be out of date. The next release was due by Jan 31, 2026. Last checked for an update: Oct 31, 2026.
Generators
| Generator | Technology | Energy source | Nameplate | Operating since | Status |
|---|---|---|---|---|---|
| W10 | Petroleum Liquids | DFO | 51.3 MW | 1973 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| W5 | Petroleum Liquids | RFO | 54.4 MW | 1959 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| W6 | Petroleum Liquids | RFO | 54.4 MW | 1961 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| W7 | Petroleum Liquids | RFO | 81.6 MW | 1966 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| W8 | Petroleum Liquids | RFO | 81.6 MW | 1968 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
| W9 | Petroleum Liquids | DFO | 51.3 MW | 1973 | Operable · As of September 2026 (EIA-860M): (OP) Operating |
U.S. Energy Information Administration · Monthly Update to the Annual Electric Generator Report (Form EIA-860M) · data for 2026-09 · as of Oct 23, 2026 · retrieved Oct 31, 2026 · CC-BY-4.0 May be out of date. The next release was due by Nov 23, 2026. Last checked for an update: Oct 31, 2026.