# Athos Solar Project CAISO Solar Photovoltaic · https://askthegrid.com/assets/facilities/athos-solar-project Athos Solar Project is a solar power facility with 250 MW of EIA-reported operating capacity in Riverside County, California, registered as EIA Plant ID 63300. SE Athos I, LLC is the registered plant entity or operator. Project filings list 821,034 solar panels and 360 inverters for the facility. ## Key facts - Technology: Solar Photovoltaic - Power capacity: 250 MW - Operating status: operating ## Grid and market context - ISO/RTO: CAISO - Balancing authority: CISO (California Independent System Operator) - Substation: SCE Red Bluff substation - Point of interconnection: SCE Red Bluff substation - Transmission owner: Southern California Edison Co. - Interconnection voltage: 220 kV ## Source-backed facts - Owner logo domain: sbenergy.com — Athos I - SB Energy · confidence: medium - Official project url: https://sbenergy.com/project/athos-i/ — Athos I - SB Energy · confidence: medium - Owner name: SB Energy — Athos I - SB Energy · confidence: medium - Canonical name: Athos Solar Project — MBR | Index · confidence: high - Parties.2: {"relationship":"Developer / original project developer","name":"Intersect Power, LLC","official_url":"https://www.intersect.com/"} — Athos Solar · confidence: medium - Parties.3: {"relationship":"PPA counterparty / offtaker","name":"Direct Energy Business","official_url":null} — Intersect Power and Direct Energy Business Sign Long-term Power Purchase Agreement on 250 MW Solar Project in California · confidence: medium - Product url: https://www.firstsolar.com/en/Products/Series-6 — Series 6 Family · confidence: medium - Product url: https://www.firstsolar.com/en/Products/Series-6 — Solar Ware Ninja™ · confidence: medium - Pcs or inverters: 360 — Q1 2022 - Going big with Cali solar project : BackIssues, altenerG.com - enerG Alternative Sources Magazine - enerG,Archives · confidence: medium - Manufacturer domain: firstsolar.com — Series 6 Family · confidence: medium - Manufacturer domain: firstsolar.com — Solar Ware Ninja™ · confidence: medium - Equipment models: [{"manufacturer_domain":"firstsolar.com","product_url":"https://www.firstsolar.com/en/Products/Series-6","count":821034,"unit_mw":null,"name":"First Solar Series 6"},{"manufacturer_domain":"tmeic.com","product_url":"https://tmeic.com/wp-content/uploads/2025/04/SolarwareNinjaBrochure0523-web.pdf","count":360,"unit_mw":0.84,"name":"TMEIC Solar Ware Ninja 840 kW"},{"manufacturer_domain":null,"product_url":null,"count":10336,"unit_mw":null,"name":"NEXTracker Horizon single-axis tracker"}] — Solar Ware Ninja™ · confidence: medium - Product family: First Solar Series 6 — Series 6 Family · confidence: medium - Equipment models.1: {"manufacturer_domain":"tmeic.com","product_url":"https://tmeic.com/wp-content/uploads/2025/04/SolarwareNinjaBrochure0523-web.pdf","count":360,"unit_mw":0.84,"name":"TMEIC Solar Ware Ninja 840 kW"} — Q1 2022 - Going big with Cali solar project : BackIssues, altenerG.com - enerG Alternative Sources Magazine - enerG,Archives · confidence: medium - Equipment models.1: {"manufacturer_domain":"tmeic.com","product_url":"https://tmeic.com/wp-content/uploads/2025/04/SolarwareNinjaBrochure0523-web.pdf","count":360,"unit_mw":0.84,"name":"TMEIC Solar Ware Ninja 840 kW"} — Solar Ware Ninja™ · confidence: medium - Description: Athos Solar Project is an operating 250 MW solar photovoltaic plant in Riverside County near Desert Center, California, with one generating unit, IPAT1. Plant records list SE Athos I, LLC as operator, CISO as balancing authority, and June 1, 2022 as the first-unit online date. In October 2019, SB Energy announced that it would acquire Athos I from original developer Intersect Power as part of a five-project portfolio; Direct Energy Business was identified as the long-term PPA counterparty. Construction documentation describes the Athos I phase as approximately 357.15 MWdc/250 MWac, with Rosendin serving as the reported design-and-build contractor. — SB Energy and Intersect Power Partner on 1.7 GW of U.S. Solar Projects · confidence: medium - Description: Athos Solar Project is an operating 250 MW solar photovoltaic plant in Riverside County near Desert Center, California, with one generating unit, IPAT1. Plant records list SE Athos I, LLC as operator, CISO as balancing authority, and June 1, 2022 as the first-unit online date. In October 2019, SB Energy announced that it would acquire Athos I from original developer Intersect Power as part of a five-project portfolio; Direct Energy Business was identified as the long-term PPA counterparty. Construction documentation describes the Athos I phase as approximately 357.15 MWdc/250 MWac, with Rosendin serving as the reported design-and-build contractor. — Q1 2022 - Going big with Cali solar project : BackIssues, altenerG.com - enerG Alternative Sources Magazine - enerG,Archives · confidence: medium - Quality notes: ["The EIA plant record reports 250 MW of nameplate capacity for IPAT1 and no completed uprate or derate. Historical development materials quote approximately 350–361 MWdc for Athos I; those DC figures are not a change to the plant’s 250 MW nameplate rating.","The October 2019 acquisition disclosure states that SB Energy would acquire the portfolio subject to closing conditions, but does not disclose a sale price, transaction value, or definitive closing date.","The May 2021 financing disclosure is portfolio-level for Athos I, Athos II, and three other projects; it does not identify an Athos I-only financing amount. No separate expansion, retirement, or repowering milestone is reflected in the cited operational plant records."] — Q1 2022 - Going big with Cali solar project : BackIssues, altenerG.com - enerG Alternative Sources Magazine - enerG,Archives · confidence: medium - Timeline: [{"event":"Portfolio acquisition announced","date":"2019-10-31","detail":"SB Energy Global Holdings Ltd., a SoftBank Group subsidiary, announced that it would acquire five solar projects, including Athos I, from Intersect Power. The announcement was subject to closing conditions and did not state consideration or a closing date."},{"event":"Planned construction start","date":"2020-06","detail":"The Athos I project was scheduled to begin construction in June 2020; this was a planned date rather than confirmation of actual commencement."},{"event":"Financial close and construction underway","date":"2021-05-27","detail":"SB Energy announced financial close for construction of Athos I and Athos II and stated that its five-project, 1.7-GWp portfolio had begun construction."},{"event":"EPC construction phase","date":"2021-06","detail":"Rosendin was reported as constructing the combined Athos I and Athos II installation. Project documentation identified Athos I at 357.15 MWdc/250 MWac."},{"event":"Commercial operation","date":"2022-06-01","detail":"The first generating unit, IPAT1, entered operation on June 1, 2022, according to the plant record."},{"event":"Operational status without uprate or derate","date":"2026-08-02","detail":"The available plant record continues to show one operational 250 MW generator and no completed uprate or derate; no retirement or repowering event is recorded."}] — Source · confidence: medium - Timeline: [{"event":"Portfolio acquisition announced","date":"2019-10-31","detail":"SB Energy Global Holdings Ltd., a SoftBank Group subsidiary, announced that it would acquire five solar projects, including Athos I, from Intersect Power. The announcement was subject to closing conditions and did not state consideration or a closing date."},{"event":"Planned construction start","date":"2020-06","detail":"The Athos I project was scheduled to begin construction in June 2020; this was a planned date rather than confirmation of actual commencement."},{"event":"Financial close and construction underway","date":"2021-05-27","detail":"SB Energy announced financial close for construction of Athos I and Athos II and stated that its five-project, 1.7-GWp portfolio had begun construction."},{"event":"EPC construction phase","date":"2021-06","detail":"Rosendin was reported as constructing the combined Athos I and Athos II installation. Project documentation identified Athos I at 357.15 MWdc/250 MWac."},{"event":"Commercial operation","date":"2022-06-01","detail":"The first generating unit, IPAT1, entered operation on June 1, 2022, according to the plant record."},{"event":"Operational status without uprate or derate","date":"2026-08-02","detail":"The available plant record continues to show one operational 250 MW generator and no completed uprate or derate; no retirement or repowering event is recorded."}] — Rosendins Renewable Energy Group Partners With Sb... · confidence: medium - Commercial parties: [{"relationship":"Owner / asset owner","name":"SB Energy","detail":"SB Energy, through its U.S. platform and project entities, announced the acquisition and subsequent ownership, construction, and operation of the Athos portfolio.","official_url":"https://sbenergy.com/"},{"relationship":"Operator / registered project company","name":"SE Athos I, LLC","detail":"Registered operator of the EIA plant 63300 and its IPAT1 generating unit.","official_url":null},{"relationship":"Developer / original project developer / seller","name":"Intersect Power, LLC","detail":"Original developer and announced seller of Athos I as part of the five-project portfolio acquired by SB Energy in October 2019.","official_url":"https://www.intersect.com/"},{"relationship":"PPA counterparty / offtaker","name":"Direct Energy Business","detail":"Long-term PPA counterparty identified for Athos I in the 2019 project announcement.","official_url":"https://www.directenergy.com/"},{"relationship":"EPC / design-and-build contractor","name":"Rosendin","detail":"Reported construction contractor for the Athos I and Athos II solar installation, including the 357.15 MWdc/250 MWac Athos I phase.","official_url":"https://www.rosendin.com/"}] — Intersect Power · confidence: medium - Commercial parties: [{"relationship":"Owner / asset owner","name":"SB Energy","detail":"SB Energy, through its U.S. platform and project entities, announced the acquisition and subsequent ownership, construction, and operation of the Athos portfolio.","official_url":"https://sbenergy.com/"},{"relationship":"Operator / registered project company","name":"SE Athos I, LLC","detail":"Registered operator of the EIA plant 63300 and its IPAT1 generating unit.","official_url":null},{"relationship":"Developer / original project developer / seller","name":"Intersect Power, LLC","detail":"Original developer and announced seller of Athos I as part of the five-project portfolio acquired by SB Energy in October 2019.","official_url":"https://www.intersect.com/"},{"relationship":"PPA counterparty / offtaker","name":"Direct Energy Business","detail":"Long-term PPA counterparty identified for Athos I in the 2019 project announcement.","official_url":"https://www.directenergy.com/"},{"relationship":"EPC / design-and-build contractor","name":"Rosendin","detail":"Reported construction contractor for the Athos I and Athos II solar installation, including the 357.15 MWdc/250 MWac Athos I phase.","official_url":"https://www.rosendin.com/"}] — Direct Energy: Electricity Company & Natural Gas Provider · confidence: medium - Commercial parties: [{"relationship":"Owner / asset owner","name":"SB Energy","detail":"SB Energy, through its U.S. platform and project entities, announced the acquisition and subsequent ownership, construction, and operation of the Athos portfolio.","official_url":"https://sbenergy.com/"},{"relationship":"Operator / registered project company","name":"SE Athos I, LLC","detail":"Registered operator of the EIA plant 63300 and its IPAT1 generating unit.","official_url":null},{"relationship":"Developer / original project developer / seller","name":"Intersect Power, LLC","detail":"Original developer and announced seller of Athos I as part of the five-project portfolio acquired by SB Energy in October 2019.","official_url":"https://www.intersect.com/"},{"relationship":"PPA counterparty / offtaker","name":"Direct Energy Business","detail":"Long-term PPA counterparty identified for Athos I in the 2019 project announcement.","official_url":"https://www.directenergy.com/"},{"relationship":"EPC / design-and-build contractor","name":"Rosendin","detail":"Reported construction contractor for the Athos I and Athos II solar installation, including the 357.15 MWdc/250 MWac Athos I phase.","official_url":"https://www.rosendin.com/"}] — Rosendins Renewable Energy Group Partners With Sb Energy To Construct One Of Californias Largest Solar Power Projects - Informed Infrastructure · confidence: medium - Commercial parties: [{"relationship":"Owner / asset owner","name":"SB Energy","detail":"SB Energy, through its U.S. platform and project entities, announced the acquisition and subsequent ownership, construction, and operation of the Athos portfolio.","official_url":"https://sbenergy.com/"},{"relationship":"Operator / registered project company","name":"SE Athos I, LLC","detail":"Registered operator of the EIA plant 63300 and its IPAT1 generating unit.","official_url":null},{"relationship":"Developer / original project developer / seller","name":"Intersect Power, LLC","detail":"Original developer and announced seller of Athos I as part of the five-project portfolio acquired by SB Energy in October 2019.","official_url":"https://www.intersect.com/"},{"relationship":"PPA counterparty / offtaker","name":"Direct Energy Business","detail":"Long-term PPA counterparty identified for Athos I in the 2019 project announcement.","official_url":"https://www.directenergy.com/"},{"relationship":"EPC / design-and-build contractor","name":"Rosendin","detail":"Reported construction contractor for the Athos I and Athos II solar installation, including the 357.15 MWdc/250 MWac Athos I phase.","official_url":"https://www.rosendin.com/"}] — Rosendin | Largest Employee-Owned Electrical Contractor · confidence: medium - Quality notes.0: The EIA plant record reports 250 MW of nameplate capacity for IPAT1 and no completed uprate or derate. Historical development materials quote approximately 350–361 MWdc for Athos I; those DC figures are not a change to the plant’s 250 MW nameplate rating. — Q1 2022 - Going big with Cali solar project : BackIssues, altenerG.com - enerG Alternative Sources Magazine - enerG,Archives · confidence: medium - Timeline.1: {"event":"Planned construction start","date":"2020-06","detail":"The Athos I project was scheduled to begin construction in June 2020; this was a planned date rather than confirmation of actual commencement."} — Source · confidence: medium - Timeline.3: {"event":"EPC construction phase","date":"2021-06","detail":"Rosendin was reported as constructing the combined Athos I and Athos II installation. Project documentation identified Athos I at 357.15 MWdc/250 MWac."} — Rosendins Renewable Energy Group Partners With Sb... · confidence: medium - Timeline.3: {"event":"EPC construction phase","date":"2021-06","detail":"Rosendin was reported as constructing the combined Athos I and Athos II installation. Project documentation identified Athos I at 357.15 MWdc/250 MWac."} — Q1 2022 - Going big with Cali solar project : BackIssues, altenerG.com - enerG Alternative Sources Magazine - enerG,Archives · confidence: medium - Commercial parties.0: {"relationship":"Owner / asset owner","name":"SB Energy","detail":"SB Energy, through its U.S. platform and project entities, announced the acquisition and subsequent ownership, construction, and operation of the Athos portfolio.","official_url":"https://sbenergy.com/"} — Athos I - SB Energy · confidence: medium - Commercial parties.2: {"relationship":"Developer / original project developer / seller","name":"Intersect Power, LLC","detail":"Original developer and announced seller of Athos I as part of the five-project portfolio acquired by SB Energy in October 2019.","official_url":"https://www.intersect.com/"} — Intersect Power · confidence: high - Commercial parties.3: {"relationship":"PPA counterparty / offtaker","name":"Direct Energy Business","detail":"Long-term PPA counterparty identified for Athos I in the 2019 project announcement.","official_url":"https://www.directenergy.com/"} — SB Energy and Intersect Power Partner on 1.7 GW of U.S. Solar Projects · confidence: high - Commercial parties.3: {"relationship":"PPA counterparty / offtaker","name":"Direct Energy Business","detail":"Long-term PPA counterparty identified for Athos I in the 2019 project announcement.","official_url":"https://www.directenergy.com/"} — Direct Energy: Electricity Company & Natural Gas Provider · confidence: high - Commercial parties.4: {"relationship":"EPC / design-and-build contractor","name":"Rosendin","detail":"Reported construction contractor for the Athos I and Athos II solar installation, including the 357.15 MWdc/250 MWac Athos I phase.","official_url":"https://www.rosendin.com/"} — Rosendins Renewable Energy Group Partners With Sb Energy To Construct One Of Californias Largest Solar Power Projects - Informed Infrastructure · confidence: medium - Commercial parties.4: {"relationship":"EPC / design-and-build contractor","name":"Rosendin","detail":"Reported construction contractor for the Athos I and Athos II solar installation, including the 357.15 MWdc/250 MWac Athos I phase.","official_url":"https://www.rosendin.com/"} — Rosendin | Largest Employee-Owned Electrical Contractor · confidence: medium - Acquisition date: 2019 — SDCP and SB Energy ink hedging agreement for offtake of 1.6GWh BESS in California - Energy-Storage.News · confidence: medium - Substation: SCE Red Bluff substation — Athos Solar · confidence: medium - Interconnection voltage kv: 220 — Athos Solar · confidence: medium - Grid role: Utility-scale solar photovoltaic generation serving the CAISO transmission grid; the EIA plant record identifies no energy-storage component. — Athos Solar · confidence: high ## Sources - [Athos I - SB Energy](https://sbenergy.com/project/athos-i/) — sbenergy.com · tier other - [SB Energy and Intersect Power Partner on 1.7 GW of U.S. Solar Projects](https://www.prnewswire.com/news-releases/sb-energy-and-intersect-power-partner-on-1-7-gw-of-us-solar-projects-300949311.html) — prnewswire.com · tier other - [MBR | Index](https://mbrweb.ferc.gov/SearchlkpEIA/Index?page=547) — mbrweb.ferc.gov · tier regulatory - [Athos Solar](https://ceqanet.lci.ca.gov/2018051021) — ceqanet.lci.ca.gov · tier regulatory - [Intersect Power and Direct Energy Business Sign Long-term Power Purchase Agreement on 250 MW Solar Project in California](https://www.prnewswire.com/news-releases/intersect-power-and-direct-energy-business-sign-long-term-power-purchase-agreement-on-250-mw-solar-project-in-california-300949376.html) — prnewswire.com · tier other - [Source](https://sbenergy.com/project/athos-i) — sbenergy.com · tier other - [Q1 2022 - Going big with Cali solar project : BackIssues, altenerG.com - enerG Alternative Sources Magazine - enerG,Archives](https://www.altenerg.com/back_issues/story.php?sid=2615) — altenerg.com · tier other - [Series 6 Family](https://www.firstsolar.com/en/Products/Series-6) — firstsolar.com · tier other - [Solar Ware Ninja™](https://tmeic.com/wp-content/uploads/2025/04/SolarwareNinjaBrochure0523-web.pdf) — tmeic.com · tier other - [SB Energy Announces Closing of Financing and Building of 1.7GW of Solar Projects Across California and Texas | Newswire](https://www.newswire.com/news/sb-energy-announces-closing-of-financing-and-building-of-1-7gw-of-21400158) — newswire.com · tier other - [Rosendins Renewable Energy Group Partners With Sb ...](https://informedinfrastructure.com/post/rosendins-renewable-energy-group-partners-with-sb-energy-to-construct-one-of-californias-largest-solar-power-projects) — informedinfrastructure.com · tier other - [Intersect Power](https://www.intersect.com/) — intersect.com · tier other - [Direct Energy: Electricity Company & Natural Gas Provider](https://www.directenergy.com/) — directenergy.com · tier other - [Rosendins Renewable Energy Group Partners With Sb Energy To Construct One Of Californias Largest Solar Power Projects - Informed Infrastructure](https://www.informedinfrastructure.com/post/rosendins-renewable-energy-group-partners-with-sb-energy-to-construct-one-of-californias-largest-solar-power-projects) — informedinfrastructure.com · tier other - [Rosendin | Largest Employee-Owned Electrical Contractor](https://www.rosendin.com/) — rosendin.com · tier other - [SDCP and SB Energy ink hedging agreement for offtake of 1.6GWh BESS in California - Energy-Storage.News](https://www.energy-storage.news/sdcp-and-sb-energy-ink-hedging-agreement-for-offtake-of-1-6gwh-bess-in-california/) — energy-storage.news · tier other - [Resource category and phase](https://www.caiso.com/documents/resourcecategoryandphaseallparticipatingresourceids.xlsx) — caiso.com · tier other ## Data quality - The EIA plant record reports 250 MW of nameplate capacity for IPAT1 and no completed uprate or derate. Historical development materials quote approximately 350–361 MWdc for Athos I; those DC figures are not a change to the plant’s 250 MW nameplate rating. The October 2019 acquisition disclosure states that SB Energy would acquire the portfolio subject to closing conditions, but does not disclose a sale price, transaction value, or definitive closing date. The May 2021 financing disclosure is portfolio-level for Athos I, Athos II, and three other projects; it does not identify an Athos I-only financing amount. No separate expansion, retirement, or repowering milestone is reflected in the cited operational plant records. --- Canonical page: https://askthegrid.com/assets/facilities/athos-solar-project Source: Ask the Grid — https://askthegrid.com/