# CA Flats Solar 150, LLC

CAISO Solar Photovoltaic · https://askthegrid.com/assets/facilities/ca-flats-solar-150-llc

CA Flats Solar 150, LLC is a solar power facility with 150 MW of EIA-reported operating capacity and 240 MWh of reported energy capacity in San Luis Obispo County, California, registered as EIA Plant ID 60034. Arevon Energy, Inc. is the registered plant entity or operator. The plant's generating configuration is one operational 150 MW solar photovoltaic (PV) generating unit, GEN01. Its grid role is utility-scale solar generation serving the CAISO grid, with associated battery storage that stores energy during peak solar hours and dispatches it during periods of peak demand.

## Key facts

- Technology: Solar Photovoltaic
- Power capacity: 150 MW
- Energy capacity: 240 MWh
- Operating status: operating

## Grid and market context

- ISO/RTO: CAISO
- Balancing authority: CISO (CAISO)

## Source-backed facts

- Owner logo domain: capdyn.com — Capital Dynamics: Private Asset Management | Investment... · confidence: medium
- Identifiers: [{"value":"60034","system":"EIA plant ID"},{"value":"GEN01","system":"EIA generator ID"},{"value":"CISO","system":"Balancing authority"},{"value":"CAISO","system":"ISO/RTO market"},{"value":"ER18-713-000","system":"FERC docket"}] — Federal Register :: CA Flats Solar 150, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: medium
- Identifiers.4: {"value":"ER18-713-000","system":"FERC docket"} — Federal Register :: CA Flats Solar 150, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: high
- Parties.0: {"relationship":"Registered project entity and FERC applicant","name":"CA Flats Solar 150, LLC","official_url":null} — Federal Register :: CA Flats Solar 150, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: high
- Parties.3: {"relationship":"Developer, EPC contractor, and solar module supplier","name":"First Solar, Inc.","official_url":"https://www.firstsolar.com/"} — Source · confidence: medium
- Product url: https://www.firstsolar.com/en/Products/Series-6 — Series 6 Family · confidence: high
- Product url: https://www.firstsolar.com/en/Products/Series-6 — Megapack · confidence: high
- Equipment models.0: {"manufacturer_domain":"firstsolar.com","product_url":"https://www.firstsolar.com/en/Products/Series-6","count":null,"unit_mw":null,"name":"First Solar Series 6"} — Series 6 Family · confidence: medium
- Construction scope: CA Flats Solar 150, LLC is the 150 MW second phase of the 280 MWAC California Flats photovoltaic project and has one operational 150 MW solar generating unit. The broader California Flats site was built with photovoltaic modules, pad-mounted inverters and transformers, and later received a co-located 60 MW/240 MWh battery-storage system using 84 Tesla Megapack units. — First Solar Sells California Flats Project to Capital Dynamics · confidence: medium
- Construction scope: CA Flats Solar 150, LLC is the 150 MW second phase of the 280 MWAC California Flats photovoltaic project and has one operational 150 MW solar generating unit. The broader California Flats site was built with photovoltaic modules, pad-mounted inverters and transformers, and later received a co-located 60 MW/240 MWh battery-storage system using 84 Tesla Megapack units. — A Legacy Preserved: How Solar Power and Ranching Can Coexist | Arevon · confidence: medium
- Product url: https://www.firstsolar.com/en/Products/Series-6 — Series 6 Family · confidence: medium
- Timeline: [{"event":"First Solar acquired the California Flats project","date":"2015","detail":"First Solar acquired the project and subsequently completed its development and construction."},{"event":"Capital Dynamics acquired the project from First Solar","date":"2017-08-22","detail":"First Solar announced completion of the sale of the 280 MWac California Flats Solar Project to Capital Dynamics. The 150 MW second phase, corresponding to the EIA plant, was under construction at the time; sale consideration was not disclosed."},{"event":"Construction of the 150 MW second phase","date":"2017-08","detail":"The second phase was under construction and was expected to be commissioned by the end of 2018 under a long-term power purchase agreement."},{"event":"GEN01 entered service","date":"2019-02-01","detail":"The single 150 MW photovoltaic generating unit recorded for EIA plant 60034 entered service."},{"event":"Broader California Flats project achieved commercial operation","date":"2019-05-28","detail":"Capital Dynamics and First Solar announced completion and commercial operation of the broader 280 MWac, two-phase California Flats Solar Project."},{"event":"Battery-storage tax equity secured","date":"2021-07-29","detail":"Capital Dynamics announced tax-equity investments from Goldman Sachs and U.S. Bank for a 60 MW/240 MWh battery system to be retrofitted at the operating California Flats site."},{"event":"California Flats battery system entered service","date":"2021","detail":"The associated 240 MWh battery energy storage system went online and began shifting solar energy toward periods of peak demand."}] — Capital Dynamics, First Solar Celebrate Commissioning of the 280MWac California Flats Solar Project · confidence: high
- Commercial parties.1: {"relationship":"Owner and buyer","name":"Capital Dynamics","detail":"Acquired the California Flats project from First Solar in August 2017 and owns the project through its clean-energy infrastructure business.","official_url":"https://www.capdyn.com/"} — Capital Dynamics, First Solar Celebrate Commissioning of the 280MWac California Flats Solar Project · confidence: high
- Commercial parties.2: {"relationship":"Developer, construction contractor, module supplier, and seller","name":"First Solar, Inc.","detail":"Acquired the project in 2015, completed development and construction, supplied Series 6 thin-film modules, and sold the project to Capital Dynamics in August 2017.","official_url":"https://www.firstsolar.com/"} — Capital Dynamics, First Solar Celebrate Commissioning of the 280MWac California Flats Solar Project · confidence: high
- Timeline.0: {"event":"First Solar acquired the California Flats project","date":"2015","detail":"First Solar acquired the project and subsequently completed its development and construction."} — Capital Dynamics, First Solar Celebrate Commissioning of the 280MWac California Flats Solar Project · confidence: high
- Timeline.2: {"event":"Construction of the 150 MW second phase","date":"2017-08","detail":"The second phase was under construction and was expected to be commissioned by the end of 2018 under a long-term power purchase agreement."} — First Solar Sells California Flats Project to Capital Dynamics · confidence: high
- Timeline.4: {"event":"Broader California Flats project achieved commercial operation","date":"2019-05-28","detail":"Capital Dynamics and First Solar announced completion and commercial operation of the broader 280 MWac, two-phase California Flats Solar Project."} — Capital Dynamics, First Solar Celebrate Commissioning of the 280MWac California Flats Solar Project · confidence: high
- Quality notes.3: The cited history contains no retirement or repowering milestone; the EIA record identifies the plant as operational. — A Legacy Preserved: How Solar Power and Ranching Can Coexist | Arevon · confidence: medium
- Status detail: CA Flats Solar 150, LLC is operating with one 150 MW generating unit, GEN01. The current plant record shows the unit as operational, while project documentation describes an expected 30–40 year operating life and eventual decommissioning but does not establish a fixed cessation date. A co-located California Flats battery system went online in 2021 and shifts stored solar energy to periods of peak demand. — A Legacy Preserved: How Solar Power and Ranching Can Coexist | Arevon · confidence: medium
- Grid role: Utility-scale solar generation serving the CAISO grid, with associated battery storage that stores energy during peak solar hours and dispatches it during periods of peak demand. — A Legacy Preserved: How Solar Power and Ranching Can Coexist | Arevon · confidence: medium

## Timeline

- 2015 — First Solar acquired the California Flats project
  First Solar acquired the project and subsequently completed its development and construction.
  Source: Capital Dynamics, First Solar Celebrate Commissioning of the 280MWac California Flats Solar Project (https://capdyn.com/Customer-Content/www/news/PDFs/CA_Flats_-_Commissioning_Press_Release_FINAL.pdf)
- 2017-08 — Construction of the 150 MW second phase
  The second phase was under construction and was expected to be commissioned by the end of 2018 under a long-term power purchase agreement.
  Source: First Solar Sells California Flats Project to Capital Dynamics (https://capdyn.com/Customer-Content/www/news/PDFs/california-flats-sale-to-capital-dynamics-media-release-final-082117.pdf)
- 2017-08-22 — Capital Dynamics acquired the project from First Solar
  First Solar announced completion of the sale of the 280 MWac California Flats Solar Project to Capital Dynamics. The 150 MW second phase, corresponding to the EIA plant, was under construction at the time; sale consideration was not disclosed.
  Source: Capital Dynamics, First Solar Celebrate Commissioning of the 280MWac California Flats Solar Project (https://capdyn.com/Customer-Content/www/news/PDFs/CA_Flats_-_Commissioning_Press_Release_FINAL.pdf)
- 2019-05-28 — Broader California Flats project achieved commercial operation
  Capital Dynamics and First Solar announced completion and commercial operation of the broader 280 MWac, two-phase California Flats Solar Project.
  Source: Capital Dynamics, First Solar Celebrate Commissioning of the 280MWac California Flats Solar Project (https://capdyn.com/Customer-Content/www/news/PDFs/CA_Flats_-_Commissioning_Press_Release_FINAL.pdf)
- 2021 — California Flats battery system entered service
  The associated 240 MWh battery energy storage system went online and began shifting solar energy toward periods of peak demand.
  Source: A Legacy Preserved: How Solar Power and Ranching Can Coexist | Arevon (https://arevonenergy.com/news/blog/powering-americas-future-protecting-its-past-the-story-of-california-flats-solar-plus-storage)
- 2021-07-29 — Battery-storage tax equity secured
  Capital Dynamics announced tax-equity investments from Goldman Sachs and U.S. Bank for a 60 MW/240 MWh battery system to be retrofitted at the operating California Flats site.
  Source: Capital Dynamics Secures Tax Equity to Retrofit its California Flats Solar Project with Battery Energy Storage | Capital Dynamics (https://www.capdyn.com/news/capital-dynamics-secures-tax-equity-to-retrofit-its-california-flats-solar-proj/)

## Sources

- [Capital Dynamics: Private Asset Management | Investment ...](https://www.capitaldynamics.com/) — capitaldynamics.com · tier other
- [First Solar Sells California Flats Project to Capital Dynamics](https://www.capdyn.com/Customer-Content/www/news/PDFs/california-flats-sale-to-capital-dynamics-media-release-final-082117.pdf) — capdyn.com · tier other
- [Federal Register :: CA Flats Solar 150, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization](https://www.federalregister.gov/documents/2018/02/01/2018-01975/ca-flats-solar-150-llc-supplemental-notice-that-initial-market-based-rate-filing-includes-request) — federalregister.gov · tier regulatory
- [A Legacy Preserved: How Solar Power and Ranching Can Coexist | Arevon](https://arevonenergy.com/news/blog/powering-americas-future-protecting-its-past-the-story-of-california-flats-solar-plus-storage/) — arevonenergy.com · tier other
- [Capital Dynamics, First Solar Celebrate Commissioning of the ...](https://www.capdyn.com/Customer-Content/www/news/PDFs/CA_Flats_-_Commissioning_Press_Release_FINAL.pdf) — capdyn.com · tier other
- [closeout letter](https://www.pge.com/assets/rates/tariffs/assets/pdf/adviceletter/ELEC_4367-E.pdf) — pge.com · tier other
- [First Solar Sells California Flats Project to Capital Dynamics](https://capdyn.com/Customer-Content/www/news/PDFs/california-flats-sale-to-capital-dynamics-media-release-final-082117.pdf) — capdyn.com · tier other
- [Renewable Energy - Hearst Ranch Beef](https://www.hearstranch.com/renewable-energy/) — hearstranch.com · tier other
- [Series 6 Family](https://www.firstsolar.com/en/Products/Series-6) — firstsolar.com · tier other
- [Megapack](https://www.tesla.com/megapack) — tesla.com · tier other
- [Pacific Gas & Electric Company ELC (Corp ID 39) Status of Advice Letter 6192E Disposition: Accepted Effective Date: 06-10-2021](https://www.pge.com/tariffs/assets/pdf/adviceletter/ELEC_6192-E.pdf) — pge.com · tier other
- [A Legacy Preserved: How Solar Power and Ranching Can Coexist | Arevon](https://arevonenergy.com/news/blog/powering-americas-future-protecting-its-past-the-story-of-california-flats-solar-plus-storage) — arevonenergy.com · tier other
- [California Flats Solar Project - CEQAnet](https://ceqanet.lci.ca.gov/2013041031/2) — ceqanet.lci.ca.gov · tier regulatory
- [Capital Dynamics, First Solar Celebrate Commissioning of the 280MWac California Flats Solar Project](https://capdyn.com/Customer-Content/www/news/PDFs/CA_Flats_-_Commissioning_Press_Release_FINAL.pdf) — capdyn.com · tier other
- [Capital Dynamics Secures Tax Equity to Retrofit its California Flats Solar Project with Battery Energy Storage | Capital Dynamics](https://www.capdyn.com/news/capital-dynamics-secures-tax-equity-to-retrofit-its-california-flats-solar-proj/) — capdyn.com · tier other
- [Capital Dynamics spins out solar and storage development ...](https://www.energy-storage.news/capital-dynamics-spins-out-solar-and-storage-development-group-arevon/) — energy-storage.news · tier other
- [Resource category and phase](https://www.caiso.com/documents/resourcecategoryandphaseallparticipatingresourceids.xlsx) — caiso.com · tier other
- [Source](https://www.fws.gov/sites/default/files/documents/FONSI-and-EA_California-Flats-Solar-eagle-permit-disturb-2017.pdf) — fws.gov · tier regulatory

## Data quality

- EIA plant 60034 identifies CA Flats Solar 150, LLC as one operational 150 MW photovoltaic generator, GEN01, online February 1, 2019; the 280 MWac figure refers to the broader two-phase California Flats project, not this plant’s EIA nameplate capacity. The 60 MW/240 MWh battery is an associated retrofit at the California Flats site and should not be counted as an additional photovoltaic generator in the EIA plant record. Historical project sources describe the broader facility as being near the San Luis Obispo–Monterey County border and in Monterey County, while the EIA record specifically assigns plant 60034 to San Luis Obispo County. The cited history contains no retirement or repowering milestone; the EIA record identifies the plant as operational.

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