Southern Power Co · San Bernardino County · CAISO
Stateline Solar is a solar power facility with 299.5 MW of EIA-reported nameplate capacity in San Bernardino County, California, registered as EIA Plant ID 58646. Southern Power Co owns and operates the plant. Project filings list 3,200,000 solar panels for the facility. Southern Power Company acquired a 51% interest in the plant from First Solar, Inc. in August 2015.
Investigate technology, capacity, output, price behavior, ownership, and related facilities using this profile plus current grid data.
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Primary generation technology.
Southern Power Co · San Bernardino County · CAISO
Installed equipment documented in public project records.
Solar Photovoltaic
CAISO
CAISO · San Bernardino County
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| STL | 75.9 MW 76 MW summer | Solar Photovoltaic Solar · PV | Dec 2015 | Operating |
| STL2 | 34.1 MW 34 MW summer | Solar Photovoltaic Solar · PV | Dec 2015 | Operating |
| STL3 | 37.9 MW 38 MW summer | Solar Photovoltaic Solar · PV | Jan 2016 | Operating |
| STL4 | 37.9 MW 38 MW summer |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
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Project milestones and public references behind the asset profile.
CPUC-approved 20-year PPA for electricity and RECs; 300 MW capacity, approximately 673 GWh/year. PPA approved without modification; pricing confidential.
Solar Photovoltaic Solar · PV |
| Feb 2016 |
| Operating |
| STL5 | 37.9 MW 38 MW summer | Solar Photovoltaic Solar · PV | Apr 2016 | Operating |
| STL6 | 37.9 MW 38 MW summer | Solar Photovoltaic Solar · PV | Jun 2016 | Operating |
| STL7 | 37.9 MW 38 MW summer | Solar Photovoltaic Solar · PV | Jul 2016 | Operating |
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| H Allen Franklin Combined Cycle | 1,995.7 MW | AL | |
| E B Harris Electric Generating Plant | 1,304 MW | AL | |
| Wansley Combined Cycle | 1,239 MW | GA | |
| Rowan | 1,192 MW | NC | |
| Dahlberg | 919 MW | GA | |
| Cleveland Cnty Generating Facility | 736 MW | NC | |
| Edward L. Addison Generating Plant | 701.2 MW | GA | |
| Deuel Harvest Wind Energy LLC | 300 MW | SD |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioConstruction of the Desert Stateline Facility began in October 2014.
In August 2015, First Solar sold a 51% ownership interest in the partially constructed Desert Stateline project to a Southern Power subsidiary. In March 2016, the agreement was amended to transfer an additional 15%, bringing Southern Power's controlling interest to 66%.
Southern Power announced that it had acquired a controlling interest in the 300 MW facility from First Solar; First Solar retained the remaining interest.
EIA-860 lists generator STL, generator STL2 with this operating date.
EIA-860 lists generator STL3 with this operating date.
EIA-860 lists generator STL4 with this operating date.
EIA-860 lists generator STL5 with this operating date.
EIA-860 lists generator STL6 with this operating date.
EIA-860 lists generator STL7 with this operating date.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Stateline Solar has a reported capacity of 299.5 MW. Source: EIA Form 860.
Stateline Solar is a Solar Photovoltaic facility in San Bernardino County, CA, participating in the CAISO market.
Stateline Solar is in San Bernardino County, CA, inside the CAISO balancing area.
Stateline Solar is operated by Southern Power Co according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Stateline Solar reported 619.9 GWh over the twelve months to 2024-12. Figures are net generation as filed to EIA-923.
Stateline Solar on the Southern California Edison Co system.
By capacity, Stateline Solar ranks #57 of 7,234 operating plants of the same technology nationally. It ranks #10 of 939 in CA.
Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.
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