# Edwards Sanborn E1A

CAISO Solar Photovoltaic, Batteries · https://askthegrid.com/assets/facilities/edwards-sanborn-e1a

Edwards Sanborn E1A is a hybrid solar and battery storage facility with 293.3 MW of EIA-reported total operating capacity and 272 MWh of reported storage energy capacity in Kern County, California, registered as EIA Plant ID 64878. Axium Infrastructure is the current owner; Terra-Gen Operating Co-Hybrid is the registered plant entity or operator. Terra-Gen describes Edwards Sanborn 1A as part of one of the largest hybrid renewable-energy facilities in the United States. The broader Edwards Sanborn franchise was historically expected to become the world's largest integrated solar-powered battery-storage project.

## Key facts

- Technology: Solar Photovoltaic, Batteries
- Power capacity: 293.3 MW
- Energy capacity: 272 MWh
- Operating status: operating

## Grid and market context

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

## Source-backed facts

- Owner logo domain: axiuminfra.com — Axium acquires interest in Canadian & US Wind Portfolio · confidence: medium
- Owner name: Axium Infrastructure affiliate (80% interest); Terra-Gen, LLC (retained interest and daily operator) — Axium acquires interest in Canadian & US Wind Portfolio · confidence: medium
- Parties: [{"relationship":"Majority owner through an affiliate (80% interest)","name":"Axium Infrastructure","official_url":"https://www.axiuminfra.com/?lang=en"},{"relationship":"Retained owner, developer, and daily operator","name":"Terra-Gen, LLC","official_url":"https://terra-gen.com/"},{"relationship":"Registered EIA operator","name":"Terra-Gen Operating Co-Hybrid","official_url":"https://terra-gen.com/"},{"relationship":"Engineering, procurement, and construction contractor","name":"Mortenson","official_url":"https://www.mortenson.com/"}] — Axium acquires interest in Canadian & US Wind Portfolio · confidence: medium
- Parties.0: {"relationship":"Majority owner through an affiliate (80% interest)","name":"Axium Infrastructure","official_url":"https://www.axiuminfra.com/?lang=en"} — Axium acquires interest in Canadian & US Wind Portfolio · confidence: high
- Parties.1: {"relationship":"Retained owner, developer, and daily operator","name":"Terra-Gen, LLC","official_url":"https://terra-gen.com/"} — Axium acquires interest in Canadian & US Wind Portfolio · confidence: high
- Product url: https://power-electronics.com/en/solar/hem — HEM | Power Electronics · confidence: medium
- Product url: https://power-electronics.com/en/solar/hem — Source · confidence: medium
- Manufacturer domain: power-electronics.com — Source · confidence: high
- Manufacturer domain: power-electronics.com — HEM | Power Electronics · confidence: high
- Product family: HEM FS3430M — Source · confidence: medium
- Product family: HEM FS3430M — HEM | Power Electronics · confidence: medium
- Manufacturer name: Power Electronics — Source · confidence: medium
- Equipment models.0: {"manufacturer_domain":"power-electronics.com","product_url":"https://power-electronics.com/en/solar/hem","count":null,"unit_mw":3.43,"name":"Power Electronics HEM FS3430M integrated inverter module"} — Source · confidence: medium
- Construction scope: Operational Edwards Sanborn E1A hybrid plant in Kern County, California, comprising two generating units: 149.3 MW of solar photovoltaic generation and a 144 MW lithium-ion battery system with 272 MWh of energy capacity, 130 MW maximum charge/discharge capability, AC coupling, and CS storage-enclosure type. Disclosed suppliers include First Solar for PV modules, LG Chem and Samsung for batteries, and Power Electronics for HEM FS3430M inverter equipment. Exact E1A-installed module, battery-unit, and enclosure counts were not disclosed; published counts of 1.9+ million panels, 120,720 batteries, and 761 enclosures refer to larger Edwards Sanborn scopes or the overall franchise. — Source · confidence: medium
- Construction scope: Operational Edwards Sanborn E1A hybrid plant in Kern County, California, comprising two generating units: 149.3 MW of solar photovoltaic generation and a 144 MW lithium-ion battery system with 272 MWh of energy capacity, 130 MW maximum charge/discharge capability, AC coupling, and CS storage-enclosure type. Disclosed suppliers include First Solar for PV modules, LG Chem and Samsung for batteries, and Power Electronics for HEM FS3430M inverter equipment. Exact E1A-installed module, battery-unit, and enclosure counts were not disclosed; published counts of 1.9+ million panels, 120,720 batteries, and 761 enclosures refer to larger Edwards Sanborn scopes or the overall franchise. — Source · confidence: medium
- Product url: https://power-electronics.com/en/solar/hem — Source · confidence: medium
- Manufacturer domain: power-electronics.com — Source · confidence: high
- Manufacturer domain: power-electronics.com — Source · confidence: high
- Equipment models: [{"manufacturer_domain":"power-electronics.com","product_url":"https://power-electronics.com/en/solar/hem","count":null,"unit_mw":3.43,"name":"Power Electronics HEM FS3430M integrated inverter module"},{"manufacturer_domain":"firstsolar.com","product_url":null,"count":null,"unit_mw":null,"name":"First Solar photovoltaic modules; exact model not disclosed"},{"manufacturer_domain":"lgchem.com","product_url":null,"count":null,"unit_mw":null,"name":"LG Chem lithium-ion battery units; exact model not disclosed"},{"manufacturer_domain":"samsungsdi.com","product_url":null,"count":null,"unit_mw":null,"name":"Samsung lithium-ion battery units; exact model not disclosed"}] — Source · confidence: medium
- Equipment models: [{"manufacturer_domain":"power-electronics.com","product_url":"https://power-electronics.com/en/solar/hem","count":null,"unit_mw":3.43,"name":"Power Electronics HEM FS3430M integrated inverter module"},{"manufacturer_domain":"firstsolar.com","product_url":null,"count":null,"unit_mw":null,"name":"First Solar photovoltaic modules; exact model not disclosed"},{"manufacturer_domain":"lgchem.com","product_url":null,"count":null,"unit_mw":null,"name":"LG Chem lithium-ion battery units; exact model not disclosed"},{"manufacturer_domain":"samsungsdi.com","product_url":null,"count":null,"unit_mw":null,"name":"Samsung lithium-ion battery units; exact model not disclosed"}] — Source · confidence: medium
- Product family: HEM FS3430M — Source · confidence: medium
- Manufacturer name: Power Electronics — Source · confidence: high
- Manufacturer name: Power Electronics — Source · confidence: high
- Equipment models.0: {"manufacturer_domain":"power-electronics.com","product_url":"https://power-electronics.com/en/solar/hem","count":null,"unit_mw":3.43,"name":"Power Electronics HEM FS3430M integrated inverter module"} — Source · confidence: medium
- Equipment models.1: {"manufacturer_domain":"firstsolar.com","product_url":null,"count":null,"unit_mw":null,"name":"First Solar photovoltaic modules; exact model not disclosed"} — Source · confidence: medium
- Equipment models.2: {"manufacturer_domain":"lgchem.com","product_url":null,"count":null,"unit_mw":null,"name":"LG Chem lithium-ion battery units; exact model not disclosed"} — Source · confidence: medium
- Equipment models.3: {"manufacturer_domain":"samsungsdi.com","product_url":null,"count":null,"unit_mw":null,"name":"Samsung lithium-ion battery units; exact model not disclosed"} — Source · confidence: medium
- Significance: Terra-Gen describes Edwards Sanborn 1A as part of one of the largest hybrid renewable-energy facilities in the United States. The broader Edwards Sanborn franchise was historically expected to become the world's largest integrated solar-powered battery-storage project. — Edwards Sanborn 1A - Terra-Gen · confidence: medium
- Description: Edwards Sanborn E1A is an operational solar-photovoltaic and battery plant in Kern County, California, listed in the EIA-based plant record at 293.3 MW across two generating units; its first unit entered service on August 1, 2022. Terra-Gen's project page describes E1A as 397 MW of solar generation and 548 MW / 1,501 MWh of energy storage, commissioned in phases and reaching full commercial operations in 2022. An Axium Infrastructure affiliate acquired an 80% interest from Terra-Gen in October 2022, while Terra-Gen retained an interest and managed daily operations. Mortenson served as the full EPC contractor for the solar and storage scopes, within a broader project constructed in phases beginning in 2020. — Edwards Sanborn 1A - Terra-Gen · confidence: medium
- Description: Edwards Sanborn E1A is an operational solar-photovoltaic and battery plant in Kern County, California, listed in the EIA-based plant record at 293.3 MW across two generating units; its first unit entered service on August 1, 2022. Terra-Gen's project page describes E1A as 397 MW of solar generation and 548 MW / 1,501 MWh of energy storage, commissioned in phases and reaching full commercial operations in 2022. An Axium Infrastructure affiliate acquired an 80% interest from Terra-Gen in October 2022, while Terra-Gen retained an interest and managed daily operations. Mortenson served as the full EPC contractor for the solar and storage scopes, within a broader project constructed in phases beginning in 2020. — Axium Infrastructure Invests In Phase 1 Of Edwards Sanborn Solar Storage Facility - Terra-Gen · confidence: medium
- Description: Edwards Sanborn E1A is an operational solar-photovoltaic and battery plant in Kern County, California, listed in the EIA-based plant record at 293.3 MW across two generating units; its first unit entered service on August 1, 2022. Terra-Gen's project page describes E1A as 397 MW of solar generation and 548 MW / 1,501 MWh of energy storage, commissioned in phases and reaching full commercial operations in 2022. An Axium Infrastructure affiliate acquired an 80% interest from Terra-Gen in October 2022, while Terra-Gen retained an interest and managed daily operations. Mortenson served as the full EPC contractor for the solar and storage scopes, within a broader project constructed in phases beginning in 2020. — Edwards Sanborn (Edsan) Solar Storage Phase 1A & 1B - Terra-Gen · confidence: medium
- Quality notes: ["Reported capacity varies by source and reporting boundary: the EIA-based plant record lists 293.3 MW for E1A, while Terra-Gen reports 397 MW of solar plus 548 MW of battery power and 1,501 MWh of storage for the project phase.","The August 2021 first-phase financing announcement describes 346 MWac and 1,501 MWh, whereas Terra-Gen's later project page reports 397 MW of solar and 548 MW / 1,501 MWh of storage; these figures should not be added together.","The October 2022 80% acquisition announcement identifies the buyer and seller but does not disclose purchase consideration. No separate E1A retirement or repowering milestone is reported; the current plant record remains operational with two operational units."] — Edwards Sanborn 1A - Terra-Gen · confidence: medium
- Quality notes: ["Reported capacity varies by source and reporting boundary: the EIA-based plant record lists 293.3 MW for E1A, while Terra-Gen reports 397 MW of solar plus 548 MW of battery power and 1,501 MWh of storage for the project phase.","The August 2021 first-phase financing announcement describes 346 MWac and 1,501 MWh, whereas Terra-Gen's later project page reports 397 MW of solar and 548 MW / 1,501 MWh of storage; these figures should not be added together.","The October 2022 80% acquisition announcement identifies the buyer and seller but does not disclose purchase consideration. No separate E1A retirement or repowering milestone is reported; the current plant record remains operational with two operational units."] — OCTOBER 26, 2022 - AXIUM INFRASTRUCTURE INVESTS IN PHASE 1 OF EDWARDS SANBORN SOLAR STORAGE FACILITY – Axium Infrastructure · confidence: medium
- Financing summary: First-phase project financing reached financial close in July 2021. Terra-Gen announced on August 2, 2021 that the initial phase had $804 million of senior secured credit facilities: a $400 million construction and term loan, a $328 million tax-equity bridge facility, and a $76 million construction and revolving letter-of-credit facility. J.P. Morgan provided the tax-equity commitment, while Deutsche Bank led the construction and term financing; Deutsche Bank acted as sole bookrunner and joint lead arranger with BNP Paribas and ING Capital, with Mizuho Bank, CoBank, Kookmin Bank, Rabobank, and KeyBank also named as lead arrangers. This $804 million was project financing, not sale consideration. In a separate October 2022 transaction, an Axium affiliate acquired 80% of E1A from Terra-Gen; the cited announcement disclosed no purchase price. — OCTOBER 26, 2022 - AXIUM INFRASTRUCTURE INVESTS IN PHASE 1 OF EDWARDS SANBORN SOLAR STORAGE FACILITY – Axium Infrastructure · confidence: medium
- Timeline: [{"event":"Construction began","date":"2020","detail":"Terra-Gen states that construction of the Edwards Sanborn 1A/1B facility began in 2020."},{"event":"First-phase financial close","date":"2021-07","detail":"The first phase reached financial close in July 2021."},{"event":"First-phase financing announced","date":"2021-08-02","detail":"Terra-Gen announced $804 million of senior secured project-financing facilities for the initial phase."},{"event":"First unit entered service","date":"2022-08-01","detail":"The EIA-based plant record lists the first E1A unit as online on August 1, 2022."},{"event":"Full commercial operations","date":"2022","detail":"Terra-Gen states that E1A was commissioned in phases and reached full commercial operations in 2022."},{"event":"80% ownership transaction completed","date":"2022-10-26","detail":"An Axium Infrastructure affiliate acquired an 80% interest in Edwards Sanborn 1A from Terra-Gen. Terra-Gen retained an interest and continued managing daily operations."},{"event":"Separate future phases advanced","date":"2022","detail":"Terra-Gen continued developing separate future Edwards Sanborn phases for additional solar and storage connected to CAISO. — Edwards Sanborn (Edsan) Solar Storage Phase 1A & 1B - Terra-Gen · confidence: medium
- Timeline: [{"event":"Construction began","date":"2020","detail":"Terra-Gen states that construction of the Edwards Sanborn 1A/1B facility began in 2020."},{"event":"First-phase financial close","date":"2021-07","detail":"The first phase reached financial close in July 2021."},{"event":"First-phase financing announced","date":"2021-08-02","detail":"Terra-Gen announced $804 million of senior secured project-financing facilities for the initial phase."},{"event":"First unit entered service","date":"2022-08-01","detail":"The EIA-based plant record lists the first E1A unit as online on August 1, 2022."},{"event":"Full commercial operations","date":"2022","detail":"Terra-Gen states that E1A was commissioned in phases and reached full commercial operations in 2022."},{"event":"80% ownership transaction completed","date":"2022-10-26","detail":"An Axium Infrastructure affiliate acquired an 80% interest in Edwards Sanborn 1A from Terra-Gen. Terra-Gen retained an interest and continued managing daily operations."},{"event":"Separate future phases advanced","date":"2022","detail":"Terra-Gen continued developing separate future Edwards Sanborn phases for additional solar and storage connected to CAISO. — Edwards Sanborn 1A - Terra-Gen · confidence: medium
- Timeline: [{"event":"Construction began","date":"2020","detail":"Terra-Gen states that construction of the Edwards Sanborn 1A/1B facility began in 2020."},{"event":"First-phase financial close","date":"2021-07","detail":"The first phase reached financial close in July 2021."},{"event":"First-phase financing announced","date":"2021-08-02","detail":"Terra-Gen announced $804 million of senior secured project-financing facilities for the initial phase."},{"event":"First unit entered service","date":"2022-08-01","detail":"The EIA-based plant record lists the first E1A unit as online on August 1, 2022."},{"event":"Full commercial operations","date":"2022","detail":"Terra-Gen states that E1A was commissioned in phases and reached full commercial operations in 2022."},{"event":"80% ownership transaction completed","date":"2022-10-26","detail":"An Axium Infrastructure affiliate acquired an 80% interest in Edwards Sanborn 1A from Terra-Gen. Terra-Gen retained an interest and continued managing daily operations."},{"event":"Separate future phases advanced","date":"2022","detail":"Terra-Gen continued developing separate future Edwards Sanborn phases for additional solar and storage connected to CAISO. — Axium Infrastructure Invests In Phase 1 Of Edwards Sanborn Solar Storage Facility - Terra-Gen · confidence: medium
- Commercial parties: [{"relationship":"Majority owner through an affiliate; buyer in the 2022 ownership transaction","name":"Axium Infrastructure","detail":"An Axium affiliate acquired an 80% interest in Edwards Sanborn 1A from Terra-Gen on October 26, 2022.","official_url":"https://www.axiuminfra.com/"},{"relationship":"Retained owner, developer, seller of the 80% interest, and daily operator","name":"Terra-Gen, LLC","detail":"Terra-Gen developed the facility, sold an 80% interest to Axium, retained an interest, and continued managing daily operations.","official_url":"https://terra-gen.com/"},{"relationship":"Registered EIA operator","name":"Terra-Gen Operating Co-Hybrid","detail":"The EIA-based plant record identifies Terra-Gen Operating Co-Hybrid as the operator of plant 64878.","official_url":"https://terra-gen.com/"},{"relationship":"Engineering, procurement, and construction contractor","name":"Mortenson","detail":"Mortenson was the full EPC contractor for both the solar-generation and energy-storage scopes.","official_url":"https://www.mortenson.com/"},{"relationship":"Tax-equity provider for the initial phase","name":"J.P. Morgan","detail":"J.P. Morgan provided the tax-equity commitment for the initial phase financing.","official_url":"https://www.jpmorgan.com/"},{"relationship":"Construction and term-financing lead arranger","name":"Deutsche Bank","detail":"Deutsche Bank led the construction and term financing and served as sole bookrunner and joint lead arranger.","official_url":"https://www.db.com/"},{"relationship":"Joint lead arranger","name":"BNP Paribas","detail":"BNP Paribas was named as a joint lead arranger for the initial-phase construction and term financing.","official_url":"https://group.bnpparibas/en"},{"relationship":"Joint lead arranger","name":"ING Capital","detail":"ING Capital was named as a joint lead arranger for the initial-phase construction and term financing.","official_url":"https://www.ing.com/"},{"relationship":"Solar-module supplier","name":"First Solar","detail":"First Solar supplied the solar modules for the initial phase.","official_url":"https://www.firstsolar.com/"},{"relationship":"Battery supplier","name":"LG Chem","detail":"LG Chem supplied batteries for the initial phase.","official_url":"https://www.lgchem.com/"},{"relationship":"Battery supplier","name":"Samsung","detail":"Samsung was identified by Terra-Gen as a battery supplier for the initial phase; the cited announcement does not specify the Samsung legal entity or product subsidiary.","official_url":null},{"relationship":"Transaction financial adviser to Axium","name":"Citi","detail":"Citi acted as Axium's exclusive financial adviser for the 80% ownership transaction.","official_url":"https://www.citigroup.com/"},{"relationship":"Transaction financial adviser to Terra-Gen","name":"BofA Securities","detail":"BofA Securities acted as Terra-Gen's exclusive financial adviser for the 80% ownership transaction.","official_url":"https://business.bofa.com/"},{"relationship":"Transaction legal counsel to Axium","name":"King & Spalding","detail":"King & Spalding acted as legal counsel to Axium for the ownership transaction.","official_url":"https://www.kslaw.com/"},{"relationship":"Transaction and financing legal counsel to Terra-Gen","name":"Latham & Watkins","detail":"Latham & Watkins represented Terra-Gen in the sale of the 80% interest and also advised on Edwards Sanborn project-financing matters.","official_url":"https://www.lw.com/"}] — Axium Infrastructure Invests In Phase 1 Of Edwards Sanborn Solar Storage Facility - Terra-Gen · confidence: medium
- Quality notes.0: Reported capacity varies by source and reporting boundary: the EIA-based plant record lists 293.3 MW for E1A, while Terra-Gen reports 397 MW of solar plus 548 MW of battery power and 1,501 MWh of storage for the project phase. — Edwards Sanborn (Edsan) Solar Storage Phase 1A & 1B - Terra-Gen · confidence: medium
- Quality notes.0: Reported capacity varies by source and reporting boundary: the EIA-based plant record lists 293.3 MW for E1A, while Terra-Gen reports 397 MW of solar plus 548 MW of battery power and 1,501 MWh of storage for the project phase. — Axium Infrastructure Invests In Phase 1 Of Edwards Sanborn Solar Storage Facility - Terra-Gen · confidence: medium
- Quality notes.0: Reported capacity varies by source and reporting boundary: the EIA-based plant record lists 293.3 MW for E1A, while Terra-Gen reports 397 MW of solar plus 548 MW of battery power and 1,501 MWh of storage for the project phase. — Edwards Sanborn 1A - Terra-Gen · confidence: medium
- Quality notes.1: The August 2021 first-phase financing announcement describes 346 MWac and 1,501 MWh, whereas Terra-Gen's later project page reports 397 MW of solar and 548 MW / 1,501 MWh of storage; these figures should not be added together. — Edwards Sanborn 1A - Terra-Gen · confidence: medium
- Quality notes.2: The October 2022 80% acquisition announcement identifies the buyer and seller but does not disclose purchase consideration. No separate E1A retirement or repowering milestone is reported; the current plant record remains operational with two operational units. — OCTOBER 26, 2022 - AXIUM INFRASTRUCTURE INVESTS IN PHASE 1 OF EDWARDS SANBORN SOLAR STORAGE FACILITY – Axium Infrastructure · confidence: medium
- Timeline.0: {"event":"Construction began","date":"2020","detail":"Terra-Gen states that construction of the Edwards Sanborn 1A/1B facility began in 2020."} — Edwards Sanborn (Edsan) Solar Storage Phase 1A & 1B - Terra-Gen · confidence: medium
- Timeline.4: {"event":"Full commercial operations","date":"2022","detail":"Terra-Gen states that E1A was commissioned in phases and reached full commercial operations in 2022."} — Edwards Sanborn 1A - Terra-Gen · confidence: high
- Timeline.5: {"event":"80% ownership transaction completed","date":"2022-10-26","detail":"An Axium Infrastructure affiliate acquired an 80% interest in Edwards Sanborn 1A from Terra-Gen. Terra-Gen retained an interest and continued managing daily operations."} — Axium Infrastructure Invests In Phase 1 Of Edwards Sanborn Solar Storage Facility - Terra-Gen · confidence: high
- Timeline.6: {"event":"Separate future phases advanced","date":"2022","detail":"Terra-Gen continued developing separate future Edwards Sanborn phases for additional solar and storage connected to CAISO. — Axium Infrastructure Invests In Phase 1 Of Edwards Sanborn Solar Storage Facility - Terra-Gen · confidence: medium
- Commercial parties.0: {"relationship":"Majority owner through an affiliate; buyer in the 2022 ownership transaction","name":"Axium Infrastructure","detail":"An Axium affiliate acquired an 80% interest in Edwards Sanborn 1A from Terra-Gen on October 26, 2022.","official_url":"https://www.axiuminfra.com/"} — Axium Infrastructure Invests In Phase 1 Of Edwards Sanborn Solar Storage Facility - Terra-Gen · confidence: high
- Commercial parties.1: {"relationship":"Retained owner, developer, seller of the 80% interest, and daily operator","name":"Terra-Gen, LLC","detail":"Terra-Gen developed the facility, sold an 80% interest to Axium, retained an interest, and continued managing daily operations.","official_url":"https://terra-gen.com/"} — Axium Infrastructure Invests In Phase 1 Of Edwards Sanborn Solar Storage Facility - Terra-Gen · confidence: high
- Commercial parties.3: {"relationship":"Engineering, procurement, and construction contractor","name":"Mortenson","detail":"Mortenson was the full EPC contractor for both the solar-generation and energy-storage scopes.","official_url":"https://www.mortenson.com/"} — Terra-Gen Closes Financing for First Phase of Edwards Sanborn Solar Storage Facility in California - Terra-Gen · confidence: high
- Commercial parties.4: {"relationship":"Tax-equity provider for the initial phase","name":"J.P. Morgan","detail":"J.P. Morgan provided the tax-equity commitment for the initial phase financing.","official_url":"https://www.jpmorgan.com/"} — Terra-Gen Closes Financing for First Phase of Edwards Sanborn Solar Storage Facility in California - Terra-Gen · confidence: high
- Commercial parties.8: {"relationship":"Solar-module supplier","name":"First Solar","detail":"First Solar supplied the solar modules for the initial phase.","official_url":"https://www.firstsolar.com/"} — Terra-Gen Closes Financing for First Phase of Edwards Sanborn Solar Storage Facility in California - Terra-Gen · confidence: high

## Timeline

- 2020 — Construction began
  Terra-Gen states that construction of the Edwards Sanborn 1A/1B facility began in 2020.
  Source: Edwards Sanborn (Edsan) Solar Storage Phase 1A & 1B - Terra-Gen (https://terra-gen.com/edwards-sanborn/)
- 2021-07 — First-phase financial close
  The first phase reached financial close in July 2021.
  Source: Latham Advises Terra-Gen in Project Financing and Tax Equity Financing of Edwards Sanborn Project (https://www.lw.com/en/news/2022/09/latham-advises-terra-gen-in-project-financing-and-tax-equity-financing-of-edwards-sanborn-project)
- 2022 — Full commercial operations
  Terra-Gen states that E1A was commissioned in phases and reached full commercial operations in 2022.
  Source: Edwards Sanborn 1A - Terra-Gen (https://terra-gen.com/terragen_project/edwards-sanborn-1a)
- 2022 — Separate future phases advanced
  Terra-Gen continued developing separate future Edwards Sanborn phases for additional solar and storage connected to CAISO.
  Source: Axium Infrastructure Invests In Phase 1 Of Edwards Sanborn Solar Storage Facility - Terra-Gen (https://terra-gen.com/axium-infrastructure-invests-in-phase-1-of-edwards-sanborn-solar-storage-facility/)

## Sources

- [Axium acquires interest in Canadian & US Wind Portfolio](https://www.axiuminfra.com/wp-content/uploads/2022/10/Axium_News-Release_Edwards-Sanborn-1A.pdf) — axiuminfra.com · tier other
- [Edwards Sanborn 1A - Terra-Gen](https://terra-gen.com/terragen_project/edwards-sanborn-1a) — terra-gen.com · tier other
- [Edwards & Sanborn Solar + Energy Storage | Mortenson](https://www.mortenson.com/projects/edwards-sanborn-solar-plus-storage) — mortenson.com · tier other
- [Source](https://mortenson.com/projects/edwards-sanborn-solar-plus-storage) — mortenson.com · tier other
- [HEM | Power Electronics](https://power-electronics.com/en/solar/hem) — power-electronics.com · tier other
- [Source](https://sanjosecleanenergy.org/wp-content/uploads/2021/02/Terra-Gen.Edwards.LGIA_.PUBLIC.pdf) — sanjosecleanenergy.org · tier other
- [Edwards & Sanborn: US's Largest Solar Storage Project | Coffman Engineers](https://www.coffman.com/news/edwards-sanborn-solar-energy-storage/) — coffman.com · tier other
- [Terra-Gen Closes Financing for First Phase of Edwards Sanborn Solar Storage Facility in California - Terra-Gen](https://terra-gen.com/news-release/) — terra-gen.com · tier other
- [Source](https://altenerg.com/back_issues/story.php?sid=3125) — altenerg.com · tier other
- [Edwards Sanborn Solar Storage](https://terra-gen.com/wp-content/uploads/2026/04/20260421-Edwards-Sanborn-Solar-Storage.pdf) — terra-gen.com · tier other
- [Axium Infrastructure Invests In Phase 1 Of Edwards Sanborn Solar Storage Facility - Terra-Gen](https://terra-gen.com/axium-infrastructure-invests-in-phase-1-of-edwards-sanborn-solar-storage-facility/) — terra-gen.com · tier other
- [Edwards Sanborn (Edsan) Solar Storage Phase 1A & 1B - Terra-Gen](https://terra-gen.com/edwards-sanborn/) — terra-gen.com · tier other
- [OCTOBER 26, 2022 - AXIUM INFRASTRUCTURE INVESTS IN PHASE 1 OF EDWARDS SANBORN SOLAR STORAGE FACILITY – Axium Infrastructure](https://www.axiuminfra.com/2022/10/26/october-26-2022-axium-infrastructure-invests-in-phase-1-of-edwards-sanborn-solar-storage-facility/?lang=en) — axiuminfra.com · tier other
- [Latham Advises Terra-Gen in Project Financing and Tax Equity Financing of Edwards Sanborn Project](https://www.lw.com/en/news/2022/09/latham-advises-terra-gen-in-project-financing-and-tax-equity-financing-of-edwards-sanborn-project) — lw.com · tier other
- [Latham Watkins Advises Terra Gen Sale Interest Phase 1 Edwards Sanborn Solar Storage Facility](https://www.lw.com/en/news/2022/11/latham-watkins-advises-terra-gen-sale-interest-phase-1-edwards-sanborn-solar-storage-facility) — lw.com · tier other
- [Source](https://axiuminfra.com/wp-content/uploads/2022/10/Axium_News-Release_Edwards-Sanborn-1A.pdf) — axiuminfra.com · tier other
- [2026 NQC List](https://www.caiso.com/documents/net-qualifying-capacity-report-for-compliance-year-2026.xlsx) — caiso.com · tier other
- [Edwards Sanborn 1A - Terra-Gen](https://terra-gen.com/terragen_project/edwards-sanborn-1a/) — terra-gen.com · tier other
- [Edwards Sanborn (Edsan) Solar Storage Phase 1A & 1B - Terra-Gen](https://terra-gen.com/edwards-sanborn) — terra-gen.com · tier other
- [Briefing on Resources available for near term interconnection](https://www.caiso.com/documents/briefing-resourcesavailable-nearterminterconnection.pdf) — caiso.com · tier other

## Data quality

- Reported capacity varies by source and reporting boundary: the EIA-based plant record lists 293.3 MW for E1A, while Terra-Gen reports 397 MW of solar plus 548 MW of battery power and 1,501 MWh of storage for the project phase. The August 2021 first-phase financing announcement describes 346 MWac and 1,501 MWh, whereas Terra-Gen's later project page reports 397 MW of solar and 548 MW / 1,501 MWh of storage; these figures should not be added together. The October 2022 80% acquisition announcement identifies the buyer and seller but does not disclose purchase consideration. No separate E1A retirement or repowering milestone is reported; the current plant record remains operational with two operational units.

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Source: Ask the Grid — https://askthegrid.com/