West Loch Solar One
Honolulu County, Hawaii · EIA plant ID 61987 · Operator: Hawaiian Electric Co Inc
Nameplate20MWSummer 20 MW
Generators1in service
Net generation40GWh12 mo to Dec 2025
Capacity factor23%solar units, summer MW
Heat rate—thermal plants only
First online2019
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), solar 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) |
|---|---|---|---|
| 2019 | 4.5 | 15.5% | — |
| 2020 | 38.8 | 22.1% | — |
| 2021 | 37.2 | 21.2% | — |
| 2022 | 38.2 | 21.8% | — |
| 2023 | 39.3 | 22.4% | — |
| 2024 | 36.5 | 20.8% | — |
| 2025 | 39.9 | 22.8% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| WLS1 | Solar Photovoltaic | PV | 20 | 20 | Nov 2019 | 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% | 20 MW |
Nearby plants
Within 80 km.
| Kalaeloa Renewable Energy Park | 5 MW | 2.9 km |
| Waipio Peninsula | 11 MW | 4 km |
| AES West Oahu Solar Hybrid | 25 MW | 6 km |
| Pearl City Peninsula Solar Park | 1 MW | 6.2 km |
| Puuloa Energy | — | 6.7 km |
| Waiau | 375 MW | 7.7 km |