Atwell Island — Plant Summary
- EIA Plant ID
- 58366
- Capacity
- 20.2 MW
- Primary Fuel
- Solar
- Technology
- Solar Photovoltaic
- Status
- Operating
- Location
- Tulare, CA
- Operating Since
- 2013
- Generators
- 1
- Operator
- SPS Atwell Island LLC
- Parent Company
- —
- Annual Generation
- 33,268 MWh
- Capacity Factor
- 18.8%
- Balancing Authority
- California Independent System Operator
- ISO/RTO
- CAISO
- NERC Region
- WECC
Atwell Island
OperatingSolar
Ranked #179 of 963 Solar plants in CA#1548 of 7447 nationally
20.2 MW Solar operating in Tulare, CA — California Independent System Operator
EIAGEMWD
20.2 MW
Nameplate Capacity
1
Generators
unit
Solar Photovoltaic
Technology
2013
Operating Since
Location
Coordinates
35.8154, -119.4511
County
Tulare, CA
Nearby Plants
- Atwell Island West SolarSolar20 MW · 0.8 km
- Angela Solar ProjectBESS80 MW · 5.6 km
- White River Solar 2Solar19.8 MW · 6.6 km
Ownership & Operator
Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | SPS Atwell Island LLC | SPS Atwell | — |
| Owner(s) | Atwell Solar Trust 2012 | SunEdison Inc [100%] | — |
| Status | Operating | operating | — |
Ownership Chain
GEM identifies the owner as SunEdison Inc [100%]
This entity is not yet in the GEM ownership database — chain unavailable.
About
Atwell Island is a 20.2 MW solar photovoltaic power plant located in Tulare County, California. The plant began operating in 2013 and has one generator. It is owned and operated by SPS Atwell Island LLC. The plant utilizes a fixed-tilt solar tracking system. Atwell Island is connected to the California Independent System Operator (CAISO) balancing authority within the Western Electricity Coordinating Council (WECC) NERC region.
In the most recent year of data, Atwell Island generated 33,268 MWh of electricity, achieving a capacity factor of 18.8%. The plant ranks 112th in size among California's 862 power plants and 1349th nationally out of 7108 plants. Financial data is available for Atwell Island from LBNL, though specific metrics are not provided.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
California Independent System Operator
Grid Voltage
115 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Generation
1.3K MWh
Latest Month
33.3K MWh
Annual Generation
18.8%
Capacity Factor
Jan 2022 – Dec 2024
Financial DataBeta
Source: LBNL Utility-Scale SolarHIGH
$143.8/MWh
LCOE (Levelized Cost)
$6.0/MWh
Energy Value
Pricing & Market Data
HIGH confidenceMarket Position
ISO/RTO Market
CAISO
LMP Node
ATWELL_1_N001
Pricing Hub
TH_ZP26_GEN-APND
Location Type
Pricing Node
Node Source
Curated node match
News & Articles (2)Beta
General
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California drought: Central Valley farmland on its last legs
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Last updated 2026-03-14
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