Schofield Generating Station
Honolulu County, Hawaii · EIA plant ID 60328 · Operator: Hawaiian Electric Co Inc
Nameplate50MWSummer 50 MW
Generators6in service
Net generation19GWh12 mo to Aug 2026
Capacity factor4%other units, summer MW
Heat rate—Btu/kWhfossil units, electric fuel, HHV
First online2018
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), other 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) |
|---|---|---|---|
| 2018 | 31.2 | 12.1% | — |
| 2019 | 50.7 | 11.5% | — |
| 2020 | 27 | 6.1% | — |
| 2021 | 22.7 | 5.1% | — |
| 2022 | 14.9 | 3.4% | — |
| 2023 | 22.9 | 3.6% | 8,462 |
| 2024 | 22.7 | 2.9% | 9,077 |
| 2025 | 9.3 | 1.8% | 9,726 |
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 |
|---|---|---|---|---|---|---|---|---|
| S1 | Other Waste Biomass | IC | 8.4 | 8.4 | Jun 2018 | Operating | — | coming soon |
| S2 | Other Waste Biomass | IC | 8.4 | 8.4 | Jun 2018 | Operating | — | coming soon |
| S3 | Other Waste Biomass | IC | 8.4 | 8.4 | Jun 2018 | Operating | — | coming soon |
| S4 | Other Waste Biomass | IC | 8.4 | 8.4 | Jun 2018 | Operating | — | coming soon |
| S5 | Other Waste Biomass | IC | 8.4 | 8.4 | Jun 2018 | Operating | — | coming soon |
| S6 | Other Waste Biomass | IC | 8.4 | 8.4 | Jun 2018 | Operating | — | 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% | 50 MW |
Nearby plants
Within 80 km.
| Waihonu South Solar | 2 MW | 4.4 km |
| Waihonu North Solar | 5 MW | 4.7 km |
| Lanikuhana Solar LLC | 15 MW | 6.6 km |
| Ho'Ohana Solar 1 | 117 MW | 7.1 km |
| Waipio Solar | 46 MW | 8.3 km |
| AES Waiawa Phase 2 Solar | — | 9.9 km |