Atwell Island
Atwell Island is a 20 MW solar farm in Tulare County, California, operated by SPS Atwell Island LLC. EIA-860M lists 1 generating unit here, inside CAISO. Its unit entered service in 2013.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 20.2 MW
- 17.4 MW net summer
- Generating units
- 1
- In service
- 2013
- EIA plant ID
- 58366
Where it is
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- County
- Tulare County, California
- Coordinates
- 35.895, -119.5108
- Balancing authority
- CISO
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- SPS Atwell Island LLC
- Primary energy source
- Solar
- Technologies
- Solar Photovoltaic
- Status
- Operating
Atwell Island: FAQ
- Where is Atwell Island?
- In Tulare County, California (CA). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Atwell Island?
- 20 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Atwell Island?
- EIA-860M names SPS Atwell Island LLC as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as Atwell Island LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — SPS Atwell Island LLC here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Atwell Island LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Atwell Island still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.