# McFarland C

CAISO Batteries · https://askthegrid.com/assets/facilities/mcfarland-c

McFarland C is a battery energy storage facility with 185 MW of EIA-reported operating capacity and 740 MWh of reported energy capacity in Yuma County, Arizona, registered as EIA Plant ID 67498. AES Clean Energy owns and operates the plant, a subsidiary of The AES Corporation. The facility interconnects at Hoodoo Wash 500 kV Switchyard at 500 kV. Its grid role is grid-scale, four-hour lithium-ion energy-storage resource contracted to provide resource adequacy with financial settlement.

## Key facts

- Technology: Batteries
- Power capacity: 185 MW
- Energy capacity: 740 MWh
- Operating status: operating

## Grid and market context

- ISO/RTO: CAISO
- Balancing authority: CAISO (CISO)
- Substation: Hoodoo Wash 500 kV Switchyard
- Point of interconnection: Hoodoo Wash 500 kV Switchyard
- Transmission owner: Arizona Public Service Company (APS) as designated interconnection/transmission filer; the Hoodoo Wash switchyard is co-owned by APS, SDG&E, and IID.
- Interconnection voltage: 500 kV

## Source-backed facts

- Owner logo domain: aes.com — AES | Accelerating the Future of Global Energy · confidence: medium
- Identifiers: [{"value":"67498","system":"EIA plant code"},{"value":"56690","system":"EIA ID"},{"value":"56691","system":"EIA ID"},{"value":"MCFRC","system":"EIA generator ID"},{"value":"CAISO","system":"ISO/RTO"},{"value":"McFarland C resource","system":"CAISO market resource"},{"value":"McFarland Solar C","system":"CAISO market resource name"},{"value":"ER24-2148-000","system":"FERC market-based-rate docket"},{"value":"EG24-193-000","system":"FERC exempt-wholesale-generator docket"}] — MBR | Index · confidence: medium
- Identifiers: [{"value":"67498","system":"EIA plant code"},{"value":"56690","system":"EIA ID"},{"value":"56691","system":"EIA ID"},{"value":"MCFRC","system":"EIA generator ID"},{"value":"CAISO","system":"ISO/RTO"},{"value":"McFarland C resource","system":"CAISO market resource"},{"value":"McFarland Solar C","system":"CAISO market resource name"},{"value":"ER24-2148-000","system":"FERC market-based-rate docket"},{"value":"EG24-193-000","system":"FERC exempt-wholesale-generator docket"}] — Federal Register :: McFarland Storage C, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: medium
- Identifiers: [{"value":"67498","system":"EIA plant code"},{"value":"56690","system":"EIA ID"},{"value":"56691","system":"EIA ID"},{"value":"MCFRC","system":"EIA generator ID"},{"value":"CAISO","system":"ISO/RTO"},{"value":"McFarland C resource","system":"CAISO market resource"},{"value":"McFarland Solar C","system":"CAISO market resource name"},{"value":"ER24-2148-000","system":"FERC market-based-rate docket"},{"value":"EG24-193-000","system":"FERC exempt-wholesale-generator docket"}] — Swift Air Solar, LLC, West Warwick Energy Storage... · confidence: medium
- Identifiers: [{"value":"67498","system":"EIA plant code"},{"value":"56690","system":"EIA ID"},{"value":"56691","system":"EIA ID"},{"value":"MCFRC","system":"EIA generator ID"},{"value":"CAISO","system":"ISO/RTO"},{"value":"McFarland C resource","system":"CAISO market resource"},{"value":"McFarland Solar C","system":"CAISO market resource name"},{"value":"ER24-2148-000","system":"FERC market-based-rate docket"},{"value":"EG24-193-000","system":"FERC exempt-wholesale-generator docket"}] — 2026 NQC List · confidence: medium
- Identifiers: [{"value":"67498","system":"EIA plant code"},{"value":"56690","system":"EIA ID"},{"value":"56691","system":"EIA ID"},{"value":"MCFRC","system":"EIA generator ID"},{"value":"CAISO","system":"ISO/RTO"},{"value":"McFarland C resource","system":"CAISO market resource"},{"value":"McFarland Solar C","system":"CAISO market resource name"},{"value":"ER24-2148-000","system":"FERC market-based-rate docket"},{"value":"EG24-193-000","system":"FERC exempt-wholesale-generator docket"}] — 2025 NQC List · confidence: medium
- Description: McFarland C is a 185 MW battery power plant in Yuma County, Arizona, with one generating unit. EIA and FERC records identify plant code 67498, generator MCFRC, and EIA IDs 56690 and 56691. Regulatory records describe the project as a transmission-connected, four-hour lithium-ion battery with 139 MW of incremental September NQC and a June 1, 2025 initial delivery date. — MBR | Index · confidence: medium
- Identifiers.0: {"value":"67498","system":"EIA plant code"} — MBR | Index · confidence: high
- Identifiers.1: {"value":"56690","system":"EIA ID"} — MBR | Index · confidence: medium
- Identifiers.2: {"value":"56691","system":"EIA ID"} — MBR | Index · confidence: medium
- Identifiers.3: {"value":"MCFRC","system":"EIA generator ID"} — MBR | Index · confidence: high
- Identifiers.4: {"value":"CAISO","system":"ISO/RTO"} — 2025 NQC List · confidence: medium
- Identifiers.5: {"value":"McFarland C resource","system":"CAISO market resource"} — 2025 NQC List · confidence: medium
- Identifiers.6: {"value":"McFarland Solar C","system":"CAISO market resource name"} — 2026 NQC List · confidence: medium
- Identifiers.7: {"value":"ER24-2148-000","system":"FERC market-based-rate docket"} — Federal Register :: McFarland Storage C, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: high
- Parties.0: {"relationship":"Operator","name":"AES Clean Energy","official_url":"https://www.aes.com"} — MBR | Index · confidence: medium
- Parties.4: {"relationship":"Resource-adequacy customer/offtaker","name":"Southern California Edison Company","official_url":"https://www.sce.com"} — Source · confidence: medium
- Kind: bess — Source · confidence: high
- Financing summary: AES's May 2025 green-financing report allocated $176.8 million to McFarland C Storage from the $887.6 million of net proceeds of AES's $900 million, 5.45% senior notes due 2028, issued in May 2023. This was corporate green-bond funding allocated to eligible renewable-energy expenditures, not disclosed sale consideration. AES also reports third-party tax-equity investors with variable economic interests, but no investor name or separate project-level debt amount is disclosed. SCE contract costs were confidential. — Source · confidence: high
- Financing summary: AES's May 2025 green-financing report allocated $176.8 million to McFarland C Storage from the $887.6 million of net proceeds of AES's $900 million, 5.45% senior notes due 2028, issued in May 2023. This was corporate green-bond funding allocated to eligible renewable-energy expenditures, not disclosed sale consideration. AES also reports third-party tax-equity investors with variable economic interests, but no investor name or separate project-level debt amount is disclosed. SCE contract costs were confidential. — 03-03-25 Q4-FY 2024 Fact Sheet_FINAL · confidence: high
- Timeline.1: {"event":"Planned predecessor construction window","date":"2017","detail":"The 2016 permit schedule forecast construction during 2017–2018; the cited record does not establish that this schedule was completed or that the original solar configuration entered service."} — Special Use Permit Application · confidence: high
- Timeline.3: {"event":"Corporate green-bond allocation","date":"2023-05","detail":"AES issued $900 million of 5.45% senior notes due 2028 and subsequently reported $176.8 million of the $887.6 million net proceeds allocated to McFarland C Storage, shown at 75% ownership and 185 MW."} — Source · confidence: medium
- Timeline.4: {"event":"SCE mid-term reliability contract","date":"2024-03-21","detail":"California regulatory records documented SCE's 15-year resource-adequacy-with-financial-settlement contract for McFarland C, covering 185 MW of nameplate capacity, 139 MW of incremental September NQC, and an initial delivery date of June 1, 2025."} — Source · confidence: medium
- Timeline.5: {"event":"FERC market-based-rate filing","date":"2024-06-06","detail":"The Federal Energy Regulatory Commission published a supplemental notice concerning McFarland Storage C, LLC's initial market-based-rate application and request for blanket Section 204 authorization under docket ER24-2148-000."} — Federal Register :: McFarland Storage C, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: high
- Commercial parties.2: {"relationship":"Registered project company and FERC applicant","name":"McFarland Storage C, LLC","detail":"Project company named in the FERC market-based-rate and blanket Section 204 authorization proceeding for McFarland C.","official_url":null} — Federal Register :: McFarland Storage C, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: high
- Commercial parties.3: {"relationship":"Parent company","name":"The AES Corporation","detail":"Parent company of AES Clean Energy; AES reports the project at a 75% equity interest alongside third-party tax-equity investors.","official_url":"https://www.aes.com"} — 03-03-25 Q4-FY 2024 Fact Sheet_FINAL · confidence: medium
- Commercial parties.4: {"relationship":"Resource-adequacy customer/offtaker","name":"Southern California Edison Company","detail":"SCE contracted for McFarland C's resource adequacy with financial settlement for a 15-year delivery period beginning June 1, 2025.","official_url":"https://www.sce.com"} — Source · confidence: high
- Substation: Hoodoo Wash 500 kV Switchyard — Source · confidence: high
- Interconnection voltage kv: 500 — Source · confidence: high
- Interconnection voltage kv: 500 — wwwww@ww@w@w HHHHHHHHHHHH · confidence: high
- Status detail: Operating single-unit 185 MW battery plant. CAISO records identify the associated market resource as McFarland Solar C and show it in resource and outage records; the project entered service in 2025 with a June 1, 2025 initial delivery date. — Source · confidence: high

## Timeline

- 2016-06-21 — Original predecessor development application
  Sustainable Power Group, doing business as McFarland Solar, LLC, submitted a Yuma County special-use-permit application for the proposed McFarland C Solar Project, described as a utility-scale solar facility of up to 100 MW.
  Source: Special Use Permit Application (https://public.destinyhosted.com/yumacdocs/2016/BOSREG/20161121_975/7218_McFarland%20C%20Solar%20SUP%20Application.pdf)
- 2017 — Planned predecessor construction window
  The 2016 permit schedule forecast construction during 2017–2018; the cited record does not establish that this schedule was completed or that the original solar configuration entered service.
  Source: Special Use Permit Application (https://public.destinyhosted.com/yumacdocs/2016/BOSREG/20161121_975/7218_McFarland%20C%20Solar%20SUP%20Application.pdf)
- 2017-02-19 — Corporate predecessor acquisition agreement
  AES and Alberta Investment Management Corporation agreed to acquire FTP Power LLC, doing business as sPower, from a majority-member affiliate of Fir Tree Partners, for $853 million in cash subject to adjustment plus assumption of $724 million of sPower non-recourse debt. This was a corporate sPower portfolio transaction, not a disclosed project-level McFarland C sale; closing was expected in the third quarter of 2017, but the actual closing month is not identified.
  Source: Source (https://www.sec.gov/Archives/edgar/data/874761/000114420417010800/v460369_8k.htm)
- 2023-05 — Corporate green-bond allocation
  AES issued $900 million of 5.45% senior notes due 2028 and subsequently reported $176.8 million of the $887.6 million net proceeds allocated to McFarland C Storage, shown at 75% ownership and 185 MW.
  Source: Source (https://www.aes.com/sites/vault/files/2025-05/AES-Green-Financing-Framework-Reporting-May-2025.pdf)
- 2024-03-21 — SCE mid-term reliability contract
  California regulatory records documented SCE's 15-year resource-adequacy-with-financial-settlement contract for McFarland C, covering 185 MW of nameplate capacity, 139 MW of incremental September NQC, and an initial delivery date of June 1, 2025.
  Source: Source (https://docs.cpuc.ca.gov/PublishedDocs/Published/G000/M525/K468/525468913.PDF)
- 2024-06-06 — FERC market-based-rate filing
  The Federal Energy Regulatory Commission published a supplemental notice concerning McFarland Storage C, LLC's initial market-based-rate application and request for blanket Section 204 authorization under docket ER24-2148-000.
  Source: Federal Register :: McFarland Storage C, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization (https://www.federalregister.gov/documents/2024/06/06/2024-12425/mcfarland-storage-c-llc-supplemental-notice-that-initial-market-based-rate-filing-includes-request)

## Sources

- [AES | Accelerating the Future of Global Energy](https://www.aes.com/) — aes.com · tier other
- [MBR | Index](https://mbrweb.ferc.gov/SearchlkpEIA/Index?page=805) — mbrweb.ferc.gov · tier regulatory
- [Federal Register :: McFarland Storage C, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization](https://www.federalregister.gov/documents/2024/06/06/2024-12425/mcfarland-storage-c-llc-supplemental-notice-that-initial-market-based-rate-filing-includes-request) — federalregister.gov · tier regulatory
- [Swift Air Solar, LLC, West Warwick Energy Storage ...](https://www.regulations.gov/document/FERC-2024-1086-0001) — regulations.gov · tier regulatory
- [2026 NQC List](https://www.caiso.com/documents/net-qualifying-capacity-report-for-compliance-year-2026.xlsx) — caiso.com · tier other
- [2025 NQC List](https://www.caiso.com/documents/final-net-qualifying-capacity-report-for-compliance-year-2025.xlsx) — caiso.com · tier other
- [Source](https://docs.cpuc.ca.gov/PublishedDocs/Published/G000/M525/K468/525468913.PDF) — docs.cpuc.ca.gov · tier regulatory
- [Site Plan](https://public.destinyhosted.com/yumacdocs/2016/BOSREG/20161121_975/7215_SUP16-05-SITE%20PLAN.pdf) — public.destinyhosted.com · tier other
- [WORD](https://docs.cpuc.ca.gov/PublishedDocs/Published/G000/M554/K849/554849464.docx) — docs.cpuc.ca.gov · tier regulatory
- [Source](https://aes.com/sustainability-impact/people-communities/projects) — aes.com · tier other
- [2025](https://www.aes.com/sites/vault/files/2026-03/AES-Corp-2025-Annual-Report-03-20-2026.pdf) — aes.com · tier other
- [fema flood zone x](https://public.destinyhosted.com/yumacdocs/2016/BOSREG/20161121_975/7218_SUP16-07_SITE%20PLAN.pdf) — public.destinyhosted.com · tier other
- [03-03-25 Q4-FY 2024 Fact Sheet_FINAL](https://www.aes.com/sites/vault/files/2025-04/AES-Q4-FY24-Fact-Sheet-03-03-25.pdf) — aes.com · tier other
- [Special Use Permit Application](https://public.destinyhosted.com/yumacdocs/2016/BOSREG/20161121_975/7218_McFarland%20C%20Solar%20SUP%20Application.pdf) — public.destinyhosted.com · tier other
- [Source](https://www.sec.gov/Archives/edgar/data/874761/000114420417010800/v460369_8k.htm) — sec.gov · tier regulatory
- [Source](https://www.aes.com/sites/vault/files/2025-05/AES-Green-Financing-Framework-Reporting-May-2025.pdf) — aes.com · tier other
- [aes-20251231](https://www.sec.gov/Archives/edgar/data/874761/000087476126000063/aes-20251231.htm) — sec.gov · tier regulatory
- [wwwww@ww@w@w HHHHHHHHHHHH](https://www.aps.com/-/media/APS/APSCOM-PDFs/About/Construction-and-Power-Line-Siting/Power-Line-Siting/Power-Line-Siting-Projects/Hoodoo/AmendedCEC_52.pdf?la=en&sc_lang=en&hash=6B8FB659826331623ED289509896B7E4) — aps.com · tier other
- [CAISO Resource Visibility Template](https://www.caiso.com/documents/caiso-resource-visibility-template.xlsx) — caiso.com · tier other
- [Announced Resource Retirement and Mothball List posted | California ISO](https://www.caiso.com/notices/announced-resource-retirement-and-mothball-list-posted-4) — caiso.com · tier other

## Data quality

- The cited records do not establish a project-level sale of McFarland C, the actual closing month, or project-specific sale consideration. The operation timeline therefore uses 2025 and identifies May as directory-reported.

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