West Loch Solar One
Solar power plant in Honolulu County, Hawaii. 20 MW of nameplate capacity across 1 generator, operated by Hawaiian Electric Co Inc.
Also known as EIA plant 61987
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 20 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- November 2019First generator online
- Operator
- Hawaiian Electric Co IncEIA operator ID 19547
- Grid
- HECOBalancing authority HECO
- Price nodes
- None linkedNo verified ISO node
- Location
- Honolulu County, HI21.3403, −158.0151
- EIA plant ID
- 61987EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power West Loch Solar One produces
Free · EIA-923Net generation, 2025
39.9 GWh
39,866 MWh, final
Capacity factor, 2025
22.8%
2024: 20.8%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2020 to 2025
36.5–39.9
GWh a year. Low 2024, high 2025
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | Not reported | Not reported | 0 of 12 |
| 2013 | Not reported | Not reported | 0 of 12 |
| 2014 | Not reported | Not reported | 0 of 12 |
| 2015 | Not reported | Not reported | 0 of 12 |
| 2016 | Not reported | Not reported | 0 of 12 |
| 2017 | Not reported | Not reported | 0 of 12 |
| 2018 | Not reported | Not reported | 0 of 12 |
| 2019 | 4,536 | Not reported | 2 of 12 |
| 2020 | 38,804 | 22.1% | 12 of 12 |
| 2021 | 37,156 | 21.2% | 12 of 12 |
| 2022 | 38,233 | 21.8% | 12 of 12 |
| 2023 | 39,309 | 22.4% | 12 of 12 |
| 2024 | 36,464 | 20.8% | 12 of 12 |
| 2025 | 39,866 | 22.8% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| WLS1 | Solar Photovoltaic | 20.0 | November 2019 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Hawaiian Electric Co Inc as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Modeled curtailment
A range, not one number. The lower bound counts hours inside the production tax credit window; the upper bound is the no-credit case.
Expected vs reported generation
Monthly modeled expected output and physical potential next to EIA-923 reported output.
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Power plants near West Loch Solar One
More plants operated by Hawaiian Electric Co Inc
Questions about West Loch Solar One
How much power does West Loch Solar One produce?
West Loch Solar One reported 39,866 MWh (39.9 GWh) of net generation in 2025, a 22.8% capacity factor on 20 MW of nameplate capacity.
Where is West Loch Solar One?
West Loch Solar One is in Honolulu County, Hawaii, at 21.3403, −158.0151. It is in the Hawaiian Electric Co Inc balancing area (HECO).
Who operates West Loch Solar One?
EIA-860M for August 2026 lists Hawaiian Electric Co Inc as the operator (EIA operator ID 19547). The operator is not always the owner.
When did West Loch Solar One start operating?
Its first generator began operating in November 2019, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page