# Arlington Energy Center III

CAISO Batteries, Solar Photovoltaic · https://askthegrid.com/assets/facilities/arlington-energy-center-iii

Arlington Energy Center III is a hybrid solar and battery storage facility with 241 MW of EIA-reported total operating capacity and 440 MWh of reported storage energy capacity in Riverside County, California, registered as EIA Plant ID 64564. Arlington Energy Center III owns and operates the plant. Its grid role is hybrid solar photovoltaic generation with co-located battery storage; the battery is identified as supporting ramping and spinning reserve and absorbing excess wind and solar generation.

## Key facts

- Technology: Batteries, Solar Photovoltaic
- Power capacity: 241 MW
- Energy capacity: 440 MWh
- Operating status: operating

## Grid and market context

- ISO/RTO: CAISO
- Balancing authority: CISO
- Substation: Colorado River Substation
- Point of interconnection: Colorado River Substation
- Transmission owner: Southern California Edison Co
- Interconnection voltage: 220 kV

## Source-backed facts

- Owner logo domain: clearwayenergygroup.com — FERC CID Listing 11-1-2023 · confidence: medium
- Owner logo domain: clearwayenergygroup.com — Clearway Energy - Leading US clean energy developer & operator · confidence: medium
- Identifiers: [{"value":"64564","system":"EIA plant ID"},{"value":"CAISO","system":"ISO/RTO market"},{"value":"CISO","system":"Balancing authority"},{"value":"11921","system":"FERC MBR asset appendix ID"},{"value":"ER22-415-000","system":"FERC docket"},{"value":"Arlington Energy Ctr III - Solar","system":"FERC MBR resource name"},{"value":"caiso-gen-64564","system":"CAISO generation node"},{"value":"SUNCAT_7_CN1","system":"CAISO LMP node"}] — Asset Appendix Report - MBR · confidence: medium
- Official project url: https://www.clearwayenergygroup.com/ — Clearway Energy - Leading US clean energy developer & operator · confidence: medium
- Parties: [{"relationship":"Owner / FERC market participant","name":"Arlington Energy Center III, LLC","official_url":"https://www.clearwayenergygroup.com/"},{"relationship":"EIA-listed operator","name":"Arlington Energy Center III","official_url":null}] — Asset Appendix Report - MBR · confidence: medium
- Identifiers.3: {"value":"11921","system":"FERC MBR asset appendix ID"} — Asset Appendix Report - MBR · confidence: medium
- Identifiers.4: {"value":"ER22-415-000","system":"FERC docket"} — Asset Appendix Report - MBR · confidence: high
- Identifiers.5: {"value":"Arlington Energy Ctr III - Solar","system":"FERC MBR resource name"} — Asset Appendix Report - MBR · confidence: medium
- Parties.0: {"relationship":"Owner / FERC market participant","name":"Arlington Energy Center III, LLC","official_url":"https://www.clearwayenergygroup.com/"} — Asset Appendix Report - MBR · confidence: medium
- Description: Arlington Energy Center III is an operating hybrid solar-and-storage facility in Riverside County near Blythe, California, with two generating units totaling 241 MW: 131 MW of solar photovoltaic capacity and 110 MW of battery capacity. NextEra Energy Resources developed and owns the project through Arlington Energy Center III, LLC, with NextEra portfolio records showing 100% ownership of both the solar and storage components. The solar and battery components entered service in August 2022 and operate within the California Independent System Operator balancing authority. The project received FERC market-based-rate treatment following a November 2021 filing, and its project company later became subject to a 2024 FERC enforcement settlement involving CAISO-market sales. — FPL_NextEra Energy Resources Generation Portfolios_9.30.2025.xlsx · confidence: medium
- Description: Arlington Energy Center III is an operating hybrid solar-and-storage facility in Riverside County near Blythe, California, with two generating units totaling 241 MW: 131 MW of solar photovoltaic capacity and 110 MW of battery capacity. NextEra Energy Resources developed and owns the project through Arlington Energy Center III, LLC, with NextEra portfolio records showing 100% ownership of both the solar and storage components. The solar and battery components entered service in August 2022 and operate within the California Independent System Operator balancing authority. The project received FERC market-based-rate treatment following a November 2021 filing, and its project company later became subject to a 2024 FERC enforcement settlement involving CAISO-market sales. — Federal Register :: Arlington Energy Center III, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: medium
- Financing summary: NextEra's September 30, 2025 generation portfolio lists the 131 MW solar component as 100% owned, eligible for the investment tax credit, and financed through DMI (Differential Membership Interest), which NextEra defines for solar as a traditional solar ITC tax-equity structure. The 110 MW Arlington III storage component is listed as 100% owned with no tax credit and no financing type reported. No project-level financing amount, debt principal, lender, tax-equity investor name, sale price, or acquisition consideration is disclosed. The reported DMI financing is a project-financing structure and is not a sale consideration or portfolio transaction value. — FPL_NextEra Energy Resources Generation Portfolios_9.30.2025.xlsx · confidence: medium
- Financing summary: NextEra's September 30, 2025 generation portfolio lists the 131 MW solar component as 100% owned, eligible for the investment tax credit, and financed through DMI (Differential Membership Interest), which NextEra defines for solar as a traditional solar ITC tax-equity structure. The 110 MW Arlington III storage component is listed as 100% owned with no tax credit and no financing type reported. No project-level financing amount, debt principal, lender, tax-equity investor name, sale price, or acquisition consideration is disclosed. The reported DMI financing is a project-financing structure and is not a sale consideration or portfolio transaction value. — NextEra Energy Generation Portfolio_12312022_Website.xlsx · confidence: medium
- Timeline: [{"event":"Storage development announced","date":"2020-08-31","detail":"NextEra Energy Resources announced a 110 MW Arlington Solar Energy Center battery project as one of six fully contracted California storage developments planned for operation before the end of 2022."},{"event":"FERC market-based-rate filing","date":"2021-11-16","detail":"Arlington Energy Center III, LLC filed an application for market-based-rate authorization, with an intended effective date of January 16, 2022; the filing also included a request for blanket Section 204 authorization."},{"event":"Commercial operation / first operation","date":"2022-08","detail":"The solar component is reported as a 131 MW project commissioned in August 2022, while the EIA-derived plant record reports the first unit online on August 1, 2022 and identifies the combined plant as 241 MW across two generating units."},{"event":"Ownership and financing classification","date":"2022-12-31","detail":"NextEra's year-end portfolio listed Arlington Solar III at 131 MW and 100% ownership with ITC and N/A financing, and Arlington III Storage at 110 MW and 100% ownership with N/A tax credit and N/A financing. The later portfolio record classifies the solar component's financing as DMI."},{"event":"FERC enforcement settlement","date":"2024-08-08","detail":"FERC approved a settlement involving Arlington Energy Center III, LLC and related companies requiring $381,724 of revenue disgorgement and a $105,000 civil penalty."},{"event":"CAISO allocation of disgorged funds","date":"2024-09-18","detail":"CAISO announced the allocation of the $381,724 disgorgement associated with Arlington Energy Center III, LLC under FERC docket IN24-10-000."}] — NextEra Energy Resources readies significant portfolio of California energy storage projects to enhance reliability and support the state's clean energy goals – NextEra Energy, Inc. · confidence: medium
- Timeline: [{"event":"Storage development announced","date":"2020-08-31","detail":"NextEra Energy Resources announced a 110 MW Arlington Solar Energy Center battery project as one of six fully contracted California storage developments planned for operation before the end of 2022."},{"event":"FERC market-based-rate filing","date":"2021-11-16","detail":"Arlington Energy Center III, LLC filed an application for market-based-rate authorization, with an intended effective date of January 16, 2022; the filing also included a request for blanket Section 204 authorization."},{"event":"Commercial operation / first operation","date":"2022-08","detail":"The solar component is reported as a 131 MW project commissioned in August 2022, while the EIA-derived plant record reports the first unit online on August 1, 2022 and identifies the combined plant as 241 MW across two generating units."},{"event":"Ownership and financing classification","date":"2022-12-31","detail":"NextEra's year-end portfolio listed Arlington Solar III at 131 MW and 100% ownership with ITC and N/A financing, and Arlington III Storage at 110 MW and 100% ownership with N/A tax credit and N/A financing. The later portfolio record classifies the solar component's financing as DMI."},{"event":"FERC enforcement settlement","date":"2024-08-08","detail":"FERC approved a settlement involving Arlington Energy Center III, LLC and related companies requiring $381,724 of revenue disgorgement and a $105,000 civil penalty."},{"event":"CAISO allocation of disgorged funds","date":"2024-09-18","detail":"CAISO announced the allocation of the $381,724 disgorgement associated with Arlington Energy Center III, LLC under FERC docket IN24-10-000."}] — Power plant profile: Arlington Energy Center III Solar PV Park, US · confidence: medium
- Timeline: [{"event":"Storage development announced","date":"2020-08-31","detail":"NextEra Energy Resources announced a 110 MW Arlington Solar Energy Center battery project as one of six fully contracted California storage developments planned for operation before the end of 2022."},{"event":"FERC market-based-rate filing","date":"2021-11-16","detail":"Arlington Energy Center III, LLC filed an application for market-based-rate authorization, with an intended effective date of January 16, 2022; the filing also included a request for blanket Section 204 authorization."},{"event":"Commercial operation / first operation","date":"2022-08","detail":"The solar component is reported as a 131 MW project commissioned in August 2022, while the EIA-derived plant record reports the first unit online on August 1, 2022 and identifies the combined plant as 241 MW across two generating units."},{"event":"Ownership and financing classification","date":"2022-12-31","detail":"NextEra's year-end portfolio listed Arlington Solar III at 131 MW and 100% ownership with ITC and N/A financing, and Arlington III Storage at 110 MW and 100% ownership with N/A tax credit and N/A financing. The later portfolio record classifies the solar component's financing as DMI."},{"event":"FERC enforcement settlement","date":"2024-08-08","detail":"FERC approved a settlement involving Arlington Energy Center III, LLC and related companies requiring $381,724 of revenue disgorgement and a $105,000 civil penalty."},{"event":"CAISO allocation of disgorged funds","date":"2024-09-18","detail":"CAISO announced the allocation of the $381,724 disgorgement associated with Arlington Energy Center III, LLC under FERC docket IN24-10-000."}] — NextEra Energy Generation Portfolio_12312022_Website.xlsx · confidence: medium
- Timeline: [{"event":"Storage development announced","date":"2020-08-31","detail":"NextEra Energy Resources announced a 110 MW Arlington Solar Energy Center battery project as one of six fully contracted California storage developments planned for operation before the end of 2022."},{"event":"FERC market-based-rate filing","date":"2021-11-16","detail":"Arlington Energy Center III, LLC filed an application for market-based-rate authorization, with an intended effective date of January 16, 2022; the filing also included a request for blanket Section 204 authorization."},{"event":"Commercial operation / first operation","date":"2022-08","detail":"The solar component is reported as a 131 MW project commissioned in August 2022, while the EIA-derived plant record reports the first unit online on August 1, 2022 and identifies the combined plant as 241 MW across two generating units."},{"event":"Ownership and financing classification","date":"2022-12-31","detail":"NextEra's year-end portfolio listed Arlington Solar III at 131 MW and 100% ownership with ITC and N/A financing, and Arlington III Storage at 110 MW and 100% ownership with N/A tax credit and N/A financing. The later portfolio record classifies the solar component's financing as DMI."},{"event":"FERC enforcement settlement","date":"2024-08-08","detail":"FERC approved a settlement involving Arlington Energy Center III, LLC and related companies requiring $381,724 of revenue disgorgement and a $105,000 civil penalty."},{"event":"CAISO allocation of disgorged funds","date":"2024-09-18","detail":"CAISO announced the allocation of the $381,724 disgorgement associated with Arlington Energy Center III, LLC under FERC docket IN24-10-000."}] — 20240808-188FERC61117-IN24-10-000-Arlington Energy... · confidence: medium
- Timeline.0: {"event":"Storage development announced","date":"2020-08-31","detail":"NextEra Energy Resources announced a 110 MW Arlington Solar Energy Center battery project as one of six fully contracted California storage developments planned for operation before the end of 2022."} — NextEra Energy Resources readies significant portfolio of California energy storage projects to enhance reliability and support the state's clean energy goals – NextEra Energy, Inc. · confidence: medium
- Timeline.2: {"event":"Commercial operation / first operation","date":"2022-08","detail":"The solar component is reported as a 131 MW project commissioned in August 2022, while the EIA-derived plant record reports the first unit online on August 1, 2022 and identifies the combined plant as 241 MW across two generating units."} — Power plant profile: Arlington Energy Center III Solar PV Park, US · confidence: medium
- Timeline.3: {"event":"Ownership and financing classification","date":"2022-12-31","detail":"NextEra's year-end portfolio listed Arlington Solar III at 131 MW and 100% ownership with ITC and N/A financing, and Arlington III Storage at 110 MW and 100% ownership with N/A tax credit and N/A financing. The later portfolio record classifies the solar component's financing as DMI."} — NextEra Energy Generation Portfolio_12312022_Website.xlsx · confidence: medium
- Timeline.4: {"event":"FERC enforcement settlement","date":"2024-08-08","detail":"FERC approved a settlement involving Arlington Energy Center III, LLC and related companies requiring $381,724 of revenue disgorgement and a $105,000 civil penalty."} — 20240808-188FERC61117-IN24-10-000-Arlington Energy... · confidence: high
- Commercial parties.0: {"relationship":"Developer / owner and operator","name":"NextEra Energy Resources, LLC","detail":"NextEra Energy Resources developed the project and its portfolio records show 100% ownership of the Arlington Solar III and Arlington III Storage components. The EIA-derived profile identifies NextEra as the owner and operator of the hybrid facility.","official_url":"https://www.nexteraenergyresources.com/"} — FPL_NextEra Energy Resources Generation Portfolios_9.30.2025.xlsx · confidence: medium
- Commercial parties.0: {"relationship":"Developer / owner and operator","name":"NextEra Energy Resources, LLC","detail":"NextEra Energy Resources developed the project and its portfolio records show 100% ownership of the Arlington Solar III and Arlington III Storage components. The EIA-derived profile identifies NextEra as the owner and operator of the hybrid facility.","official_url":"https://www.nexteraenergyresources.com/"} — Power plant profile: Arlington Energy Center III Solar PV Park, US · confidence: medium
- Commercial parties.1: {"relationship":"Project company / FERC market participant","name":"Arlington Energy Center III, LLC","detail":"The project company filed the FERC market-based-rate application for Arlington Energy Center III and is the named entity in the FERC asset and enforcement records.","official_url":null} — Federal Register :: Arlington Energy Center III, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: high
- Quality notes.1: Public records use both Arlington Energy Center III and NextEra-associated names for the asset. The exact EIA plant record is plant 64564, while NextEra portfolio records identify the corresponding solar and storage components as West Arlington Solar III and West Arlington III Storage. — FPL_NextEra Energy Resources Generation Portfolios_9.30.2025.xlsx · confidence: medium
- Quality notes.1: Public records use both Arlington Energy Center III and NextEra-associated names for the asset. The exact EIA plant record is plant 64564, while NextEra portfolio records identify the corresponding solar and storage components as West Arlington Solar III and West Arlington III Storage. — NextEra Energy Generation Portfolio_12312022_Website.xlsx · confidence: medium
- Quality notes.2: No buyer, seller, predecessor owner, sale consideration, or acquisition month/year is disclosed for this California asset. The October 2022 Masdar transaction concerned the UK-based Arlington Energy developer and is not treated as a transaction involving Arlington Energy Center III. — Masdar acquires UK-based BESS developer, Arlington Energy · confidence: medium
- Quality notes.3: No retirement, expansion, or repowering event is identified; the latest cited portfolio record continues to show the solar and storage components as operating 2022 assets. — FPL_NextEra Energy Resources Generation Portfolios_9.30.2025.xlsx · confidence: medium
- Quality notes.3: No retirement, expansion, or repowering event is identified; the latest cited portfolio record continues to show the solar and storage components as operating 2022 assets. — NextEra Energy Generation Portfolio_12312022_Website.xlsx · confidence: medium
- Substation: Colorado River Substation — SCE 2022 - Annual Progress Report_Final · confidence: medium
- Interconnection voltage kv: 220 — SCE 2022 - Annual Progress Report_Final · confidence: medium

## Timeline

- 2024-09-18 — CAISO allocation of disgorged funds
  CAISO announced the allocation of the $381,724 disgorgement associated with Arlington Energy Center III, LLC under FERC docket IN24-10-000.
  Source: Allocation of Disgorged Funds from Two FERC Enforcement Settlement Agreements | California ISO (https://www.caiso.com/notices/allocation-of-disgorged-funds-from-two-ferc-enforcement-settlement-agreements)

## Sources

- [FERC CID Listing 11-1-2023](https://www.ferc.gov/sites/default/files/2023-11/FERC-CID-Listing_11-1-2023.xlsx) — ferc.gov · tier regulatory
- [Clearway Energy - Leading US clean energy developer & operator](https://www.clearwayenergygroup.com/) — clearwayenergygroup.com · tier other
- [MBR | Asset Appendix Report - MBR Portal - FERC](https://mbrweb.ferc.gov/SearchMBRAssetAppendix/AssetAppendixDetails?page=1&AssetAppendixId=13524) — mbrweb.ferc.gov · tier regulatory
- [Federal Register :: Arlington Energy Center III, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization](https://www.federalregister.gov/documents/2021/12/07/2021-26493/arlington-energy-center-iii-llc-supplemental-notice-that-initial-market-based-rate-filing-includes) — federalregister.gov · tier regulatory
- [Arlington Solar Energy Center and BESS - Nextera Energy Resources - NV5](https://www.nv5.com/projects/arlington-solar-energy-center-and-bess-nextera-energy-resources/) — nv5.com · tier other
- [FPL_NextEra Energy Resources Generation Portfolios_9.30.2025.xlsx](https://www.investor.nexteraenergy.com/~/media/Files/N/NEE-IR/investor-materials/supplemental-resources/generation-portfolios/2025/Copy%20of%20FPL_NextEra%20Energy%20Resources%20Generation%20Portfolios_9302025.pdf) — investor.nexteraenergy.com · tier other
- [Masdar acquires UK-based BESS developer, Arlington Energy](https://meconstructionnews.com/55029/masdar-acquires-uk-based-bess-developer-arlington-energy) — meconstructionnews.com · tier other
- [NextEra Energy Generation Portfolio_12312022_Website.xlsx](https://www.investor.nexteraenergy.com/~/media/Files/N/NEE-IR/investor-materials/supplemental-resources/generation-portfolios/2022/Generation%20Portfolio_12312022_Website.pdf) — investor.nexteraenergy.com · tier other
- [NextEra Energy Resources readies significant portfolio of California energy storage projects to enhance reliability and support the state's clean energy goals – NextEra Energy, Inc.](https://www.investor.nexteraenergy.com/news-and-events/news-releases/2020/08-31-2020-170028306) — investor.nexteraenergy.com · tier other
- [Arlington Energy Center III Solar PV Park, US](https://www.power-technology.com/data-insights/power-plant-profile-arlington-energy-center-iii-solar-pv-park-us/) — power-technology.com · tier other
- [20240808-188FERC61117-IN24-10-000-Arlington Energy ...](https://ferc.gov/media/20240808-188ferc61117-in24-10-000-arlington-energy-et-al-settlement-agreement) — ferc.gov · tier regulatory
- [Allocation of Disgorged Funds from Two FERC Enforcement Settlement Agreements | California ISO](https://www.caiso.com/notices/allocation-of-disgorged-funds-from-two-ferc-enforcement-settlement-agreements) — caiso.com · tier other
- [eLibrary | Docket Search Results](https://elibrary.ferc.gov/eLibrary/docketsheet?docket_number=ER22-415) — elibrary.ferc.gov · tier regulatory
- [SCE 2022 - Annual Progress Report_Final](https://www.wecc.org/sites/default/files/documents/progress_report/2024/SCE%202024%20APR.pdf) — wecc.org · tier other
- [Operable](https://downloads.regulations.gov/EPA-HQ-OAR-2024-0419-0013/attachment_35.xlsx) — downloads.regulations.gov · tier regulatory

## Data quality

- The 241 MW total is the sum of separately reported 131 MW solar and 110 MW battery nameplate capacities; the battery's 440 MWh figure is an energy-capacity measure, not additional MW capacity. Public records use both Arlington Energy Center III and NextEra-associated names for the asset. The exact EIA plant record is plant 64564, while NextEra portfolio records identify the corresponding solar and storage components as West Arlington Solar III and West Arlington III Storage. No buyer, seller, predecessor owner, sale consideration, or acquisition month/year is disclosed for this California asset. The October 2022 Masdar transaction concerned the UK-based Arlington Energy developer and is not treated as a transaction involving Arlington Energy Center III. No retirement, expansion, or repowering event is identified; the latest cited portfolio record continues to show the solar and storage components as operating 2022 assets.

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