# Platinum Storage

ERCOT Batteries · https://askthegrid.com/assets/facilities/platinum-storage

Platinum Storage is a battery energy storage facility with 348 MW of EIA-reported nameplate capacity and 380 MWh of reported energy capacity in Fannin County, Texas, registered as EIA Plant ID 69044. Platinum Energy Storage LLC owns and operates the plant. SC4000UD-MV-US equipment; public project records list 87 PCS units. Commercial operation began in February 2026. Its grid role is grid-connected battery energy storage resource.

## Key facts

- Technology: Batteries
- Power capacity: 348 MW
- Energy capacity: 380 MWh
- Operating status: operating

## Grid and market context

- ISO/RTO: ERCOT
- Balancing authority: ERCOT (EIA balancing-authority code ERCO)
- Substation: Valley South Switching Station
- Point of interconnection: Valley South Switching Station
- Transmission owner: Oncor Electric Delivery Company LLC
- Interconnection voltage: 345 kV

## Source-backed facts

- Owner logo domain: engie-na.com — Source · confidence: medium
- Owner logo domain: engie-na.com — ENGIE North America | Clean Energy Solutions · confidence: medium
- Description: Platinum Storage is an operating battery energy storage plant in Fannin County, Texas, with its point of interconnection at Oncor's Valley South Switching Station near Savoy. EIA's February 2026 operating-company table lists plant ID 69044, generator ID PLAT, and 300.0 MW of net summer capacity; the filed interconnection amendment identifies 348 MVA of gross capacity and 309.53 MW of net plant output. ERCOT lists the facility's storage resources as PLATINUM_BES1 and PLATINUM_BES2, using Sungrow SC4000UD-MV-US BESS equipment. — Source · confidence: medium
- Identifiers.3: {"value":"ERCOT","system":"ISO/RTO"} — Source · confidence: medium
- Identifiers.5: {"value":"PLATINUM","system":"ERCOT Resource Name"} — Source · confidence: medium
- Identifiers.6: {"value":"PLATINUM_BES1","system":"ERCOT Resource ID"} — Source · confidence: high
- Identifiers.7: {"value":"PLATINUM_BES2","system":"ERCOT Resource ID"} — Source · confidence: high
- Parties.1: {"relationship":"Corporate parent","name":"ENGIE North America Inc.","official_url":"https://www.engie-na.com/"} — Source · confidence: high
- Parties.1: {"relationship":"Corporate parent","name":"ENGIE North America Inc.","official_url":"https://www.engie-na.com/"} — ENGIE North America | Clean Energy Solutions · confidence: high
- Parties.3: {"relationship":"Transmission service provider listed on the Texas PUC registration","name":"Rayburn Electric Cooperative","official_url":"https://www.rayburnelectric.com/"} — Rayburn Electric Cooperative · confidence: medium
- Parties.4: {"relationship":"Battery energy storage equipment OEM","name":"Sungrow Power Supply Co., Ltd.","official_url":"https://www.sungrowpower.com/ca/en/products/power-conversion-systems/b-sc4000ud-mv-us"} — ~ > X E T ~ · confidence: high
- Parties.4: {"relationship":"Battery energy storage equipment OEM","name":"Sungrow Power Supply Co., Ltd.","official_url":"https://www.sungrowpower.com/ca/en/products/power-conversion-systems/b-sc4000ud-mv-us"} — PDP B SC4000UD-MV-US - SUNGROW · confidence: high
- Unit configuration: Battery energy storage system comprising 87 Sungrow SC4000U D-MV-US inverters. ERCOT identifies two operating resource units, PLATINUM_BES1 and PLATINUM_BES2; the facility provides approximately 300 MW net output at the POI. — ~ > X E T ~ · confidence: medium
- Unit configuration: Battery energy storage system comprising 87 Sungrow SC4000U D-MV-US inverters. ERCOT identifies two operating resource units, PLATINUM_BES1 and PLATINUM_BES2; the facility provides approximately 300 MW net output at the POI. — Source · confidence: medium
- Power mw: 300 — Source · confidence: high
- Unit count: 87 — ~ > X E T ~ · confidence: medium
- Product url: https://www.sungrowpower.com/ca/en/products/power-conversion-systems/b-sc4000ud-mv-us — PDP B SC4000UD-MV-US - SUNGROW · confidence: high
- Manufacturer domain: sungrowpower.com — PDP B SC4000UD-MV-US - SUNGROW · confidence: high
- Equipment models: [{"manufacturer_domain":"sungrowpower.com","product_url":"https://www.sungrowpower.com/ca/en/products/power-conversion-systems/b-sc4000ud-mv-us","count":87,"unit_mw":null,"name":"SC4000UD-MV-US"}] — Source · confidence: medium
- Equipment models: [{"manufacturer_domain":"sungrowpower.com","product_url":"https://www.sungrowpower.com/ca/en/products/power-conversion-systems/b-sc4000ud-mv-us","count":87,"unit_mw":null,"name":"SC4000UD-MV-US"}] — PDP B SC4000UD-MV-US - SUNGROW · confidence: medium
- Product family: SC4000UD-MV-US — Source · confidence: high
- Product family: SC4000UD-MV-US — PDP B SC4000UD-MV-US - SUNGROW · confidence: high
- Manufacturer name: Sungrow Power Supply Co., Ltd. — Source · confidence: medium
- Manufacturer name: Sungrow Power Supply Co., Ltd. — PDP B SC4000UD-MV-US - SUNGROW · confidence: medium
- Equipment models.0: {"manufacturer_domain":"sungrowpower.com","product_url":"https://www.sungrowpower.com/ca/en/products/power-conversion-systems/b-sc4000ud-mv-us","count":87,"unit_mw":null,"name":"SC4000UD-MV-US"} — Source · confidence: medium
- Equipment models.0: {"manufacturer_domain":"sungrowpower.com","product_url":"https://www.sungrowpower.com/ca/en/products/power-conversion-systems/b-sc4000ud-mv-us","count":87,"unit_mw":null,"name":"SC4000UD-MV-US"} — PDP B SC4000UD-MV-US - SUNGROW · confidence: medium
- Description: Platinum Storage is a standalone battery energy-storage facility in Fannin County, Texas, interconnected at Oncor’s Valley South Switching Station at 345 kV. EIA lists Platinum Energy Storage LLC as the independent power producer for plant ID 69044, generator PLAT, with 300.0 MW of net summer capacity; the interconnection amendment specifies 348 MVA of gross capacity and 309.53 MW of net plant output. Initial development was carried out by Belltown Power, and ENGIE acquired the project through its October 2022 purchase of Belltown Power U.S.’s 6 GW development portfolio; the project company formerly known as BT Block Storage LLC is now Platinum Energy Storage LLC. ERCOT lists PLATINUM_BES1 and PLATINUM_BES2 as the facility’s standalone battery resources, and EIA records the plant as operating in February 2026. — Electric Power Monthly - U.S. Energy Information Administration (EIA) · confidence: medium
- Description: Platinum Storage is a standalone battery energy-storage facility in Fannin County, Texas, interconnected at Oncor’s Valley South Switching Station at 345 kV. EIA lists Platinum Energy Storage LLC as the independent power producer for plant ID 69044, generator PLAT, with 300.0 MW of net summer capacity; the interconnection amendment specifies 348 MVA of gross capacity and 309.53 MW of net plant output. Initial development was carried out by Belltown Power, and ENGIE acquired the project through its October 2022 purchase of Belltown Power U.S.’s 6 GW development portfolio; the project company formerly known as BT Block Storage LLC is now Platinum Energy Storage LLC. ERCOT lists PLATINUM_BES1 and PLATINUM_BES2 as the facility’s standalone battery resources, and EIA records the plant as operating in February 2026. — ~ > X E T ~ · confidence: medium
- Description: Platinum Storage is a standalone battery energy-storage facility in Fannin County, Texas, interconnected at Oncor’s Valley South Switching Station at 345 kV. EIA lists Platinum Energy Storage LLC as the independent power producer for plant ID 69044, generator PLAT, with 300.0 MW of net summer capacity; the interconnection amendment specifies 348 MVA of gross capacity and 309.53 MW of net plant output. Initial development was carried out by Belltown Power, and ENGIE acquired the project through its October 2022 purchase of Belltown Power U.S.’s 6 GW development portfolio; the project company formerly known as BT Block Storage LLC is now Platinum Energy Storage LLC. ERCOT lists PLATINUM_BES1 and PLATINUM_BES2 as the facility’s standalone battery resources, and EIA records the plant as operating in February 2026. — Engie seeks to reassure locals on safety of 300MW BESS project in Texas - Energy-Storage.News · confidence: medium
- Description: Platinum Storage is a standalone battery energy-storage facility in Fannin County, Texas, interconnected at Oncor’s Valley South Switching Station at 345 kV. EIA lists Platinum Energy Storage LLC as the independent power producer for plant ID 69044, generator PLAT, with 300.0 MW of net summer capacity; the interconnection amendment specifies 348 MVA of gross capacity and 309.53 MW of net plant output. Initial development was carried out by Belltown Power, and ENGIE acquired the project through its October 2022 purchase of Belltown Power U.S.’s 6 GW development portfolio; the project company formerly known as BT Block Storage LLC is now Platinum Energy Storage LLC. ERCOT lists PLATINUM_BES1 and PLATINUM_BES2 as the facility’s standalone battery resources, and EIA records the plant as operating in February 2026. — Source · confidence: medium
- Quality notes: ["Capacity figures use different rating bases: EIA reports 300.0 MW net summer capacity, ERCOT lists 153 MW and 157 MW resources, and the interconnection amendment specifies 348 MVA gross capacity and 309.53 MW net plant output.","The project has multiple schedule and operating milestones rather than one consistently reported commercial-operation date: the interconnection agreement scheduled commercial operation for March 3, 2025, an ERCOT report cited August 19, 2025 for commercial-operations clearance, and EIA records the plant as operating in February 2026.","No documented post-commissioning expansion, retirement, or repowering milestone was identified; the 2024 interconnection amendment documents the project’s configuration and ratings rather than a later expansion."] — Electric Power Monthly - U.S. Energy Information Administration (EIA) · confidence: medium
- Quality notes: ["Capacity figures use different rating bases: EIA reports 300.0 MW net summer capacity, ERCOT lists 153 MW and 157 MW resources, and the interconnection amendment specifies 348 MVA gross capacity and 309.53 MW net plant output.","The project has multiple schedule and operating milestones rather than one consistently reported commercial-operation date: the interconnection agreement scheduled commercial operation for March 3, 2025, an ERCOT report cited August 19, 2025 for commercial-operations clearance, and EIA records the plant as operating in February 2026.","No documented post-commissioning expansion, retirement, or repowering milestone was identified; the 2024 interconnection amendment documents the project’s configuration and ratings rather than a later expansion."] — Source · confidence: medium
- Quality notes: ["Capacity figures use different rating bases: EIA reports 300.0 MW net summer capacity, ERCOT lists 153 MW and 157 MW resources, and the interconnection amendment specifies 348 MVA gross capacity and 309.53 MW net plant output.","The project has multiple schedule and operating milestones rather than one consistently reported commercial-operation date: the interconnection agreement scheduled commercial operation for March 3, 2025, an ERCOT report cited August 19, 2025 for commercial-operations clearance, and EIA records the plant as operating in February 2026.","No documented post-commissioning expansion, retirement, or repowering milestone was identified; the 2024 interconnection amendment documents the project’s configuration and ratings rather than a later expansion."] — ~ > X E T ~ · confidence: medium
- Quality notes: ["Capacity figures use different rating bases: EIA reports 300.0 MW net summer capacity, ERCOT lists 153 MW and 157 MW resources, and the interconnection amendment specifies 348 MVA gross capacity and 309.53 MW net plant output.","The project has multiple schedule and operating milestones rather than one consistently reported commercial-operation date: the interconnection agreement scheduled commercial operation for March 3, 2025, an ERCOT report cited August 19, 2025 for commercial-operations clearance, and EIA records the plant as operating in February 2026.","No documented post-commissioning expansion, retirement, or repowering milestone was identified; the 2024 interconnection amendment documents the project’s configuration and ratings rather than a later expansion."] — Engie seeks to reassure locals on safety of 300MW BESS project in Texas - Energy-Storage.News · confidence: medium
- Financing summary: No project-specific construction debt, tax-equity amount, lender, or financial-close date was disclosed. Fannin County approved a ten-year property-tax-abatement framework for the project in May 2022, which is an incentive rather than project financing. ENGIE’s October 2022 acquisition announcement disclosed a 6 GW, 33-project portfolio transaction but no sale consideration; that portfolio figure is not project financing. — ENGIE acquires 6 GW of solar and battery storage capacity projects from Belltown Power U.S. and significantly strengthens its renewable development pipeline - ENGIE North America · confidence: medium
- Timeline.0: {"event":"Predecessor project company established","date":"2021-07","detail":"Belltown Power incorporated BT Block Storage LLC as the business subsidiary used for the Fannin County project."} — Engie seeks to reassure locals on safety of 300MW BESS project in Texas - Energy-Storage.News · confidence: medium
- Timeline.2: {"event":"Acquisition from Belltown Power U.S.","date":"2022-10-27","detail":"ENGIE North America announced the acquisition of Belltown Power U.S.’s 6 GW portfolio of 33 solar, paired-storage, and standalone-storage development projects. Project-specific consideration was not disclosed, and the transaction announcement did not separately allocate value to Platinum Storage."} — ENGIE acquires 6 GW of solar and battery storage capacity projects from Belltown Power U.S. and significantly strengthens its renewable development pipeline - ENGIE North America · confidence: medium
- Timeline.2: {"event":"Acquisition from Belltown Power U.S.","date":"2022-10-27","detail":"ENGIE North America announced the acquisition of Belltown Power U.S.’s 6 GW portfolio of 33 solar, paired-storage, and standalone-storage development projects. Project-specific consideration was not disclosed, and the transaction announcement did not separately allocate value to Platinum Storage."} — Engie seeks to reassure locals on safety of 300MW BESS project in Texas - Energy-Storage.News · confidence: medium
- Timeline.4: {"event":"Construction notice milestone","date":"2023-08-08","detail":"The interconnection schedule identified August 8, 2023 as the date by which Platinum Energy Storage was to provide notice to commence construction and the required security."} — ~ > X E T ~ · confidence: high
- Timeline.7: {"event":"Scheduled commercial-operation date","date":"2025-03-03","detail":"The 2024 interconnection schedule listed March 3, 2025 as the scheduled commercial-operation date."} — ~ > X E T ~ · confidence: high
- Timeline.8: {"event":"Construction nearing completion","date":"2025-05-23","detail":"A project report stated that ENGIE was nearing completion of the 300 MW standalone BESS near Savoy and identified the project as having been developed initially by Belltown Power."} — Engie seeks to reassure locals on safety of 300MW BESS project in Texas - Energy-Storage.News · confidence: medium
- Timeline.9: {"event":"ERCOT commercial-operations clearance target","date":"2025-08-19","detail":"The project report cited ERCOT’s interconnection queue report as scheduling the facility to be cleared for commercial operations on August 19, 2025."} — Engie seeks to reassure locals on safety of 300MW BESS project in Texas - Energy-Storage.News · confidence: medium
- Timeline.10: {"event":"EIA operating record","date":"2026-02","detail":"EIA’s February 2026 operating-company table listed Platinum Storage as an operating battery plant with plant ID 69044, generator ID PLAT, and 300.0 MW of net summer capacity."} — Electric Power Monthly - U.S. Energy Information Administration (EIA) · confidence: high
- Commercial parties.0: {"relationship":"Owner, operator, developer, and registered power-generation company","name":"Platinum Energy Storage LLC","detail":"Project company associated with Platinum Storage; EIA lists it as the IPP entity for plant 69044 and the Texas PUC registration identifies it as the registered power-generation company. Its predecessor legal name was BT Block Storage LLC.","official_url":null} — Electric Power Monthly - U.S. Energy Information Administration (EIA) · confidence: medium
- Commercial parties.0: {"relationship":"Owner, operator, developer, and registered power-generation company","name":"Platinum Energy Storage LLC","detail":"Project company associated with Platinum Storage; EIA lists it as the IPP entity for plant 69044 and the Texas PUC registration identifies it as the registered power-generation company. Its predecessor legal name was BT Block Storage LLC.","official_url":null} — ~ > X E T ~ · confidence: medium
- Commercial parties.0: {"relationship":"Owner, operator, developer, and registered power-generation company","name":"Platinum Energy Storage LLC","detail":"Project company associated with Platinum Storage; EIA lists it as the IPP entity for plant 69044 and the Texas PUC registration identifies it as the registered power-generation company. Its predecessor legal name was BT Block Storage LLC.","official_url":null} — Engie seeks to reassure locals on safety of 300MW BESS project in Texas - Energy-Storage.News · confidence: medium
- Commercial parties.0: {"relationship":"Owner, operator, developer, and registered power-generation company","name":"Platinum Energy Storage LLC","detail":"Project company associated with Platinum Storage; EIA lists it as the IPP entity for plant 69044 and the Texas PUC registration identifies it as the registered power-generation company. Its predecessor legal name was BT Block Storage LLC.","official_url":null} — ENGIE acquires 6 GW of solar and battery storage capacity projects from Belltown Power U.S. and significantly strengthens its renewable development pipeline - ENGIE North America · confidence: medium
- Commercial parties.0: {"relationship":"Owner, operator, developer, and registered power-generation company","name":"Platinum Energy Storage LLC","detail":"Project company associated with Platinum Storage; EIA lists it as the IPP entity for plant 69044 and the Texas PUC registration identifies it as the registered power-generation company. Its predecessor legal name was BT Block Storage LLC.","official_url":null} — Source · confidence: medium
- Commercial parties.1: {"relationship":"Acquirer and current corporate sponsor","name":"ENGIE North America Inc.","detail":"Acquired Belltown Power U.S.’s portfolio in October 2022, including the development pipeline containing the Platinum project; ENGIE’s North American development arm subsequently advanced the project under Platinum Energy Storage LLC.","official_url":"https://www.engie-na.com/"} — ENGIE acquires 6 GW of solar and battery storage capacity projects from Belltown Power U.S. and significantly strengthens its renewable development pipeline - ENGIE North America · confidence: medium
- Commercial parties.1: {"relationship":"Acquirer and current corporate sponsor","name":"ENGIE North America Inc.","detail":"Acquired Belltown Power U.S.’s portfolio in October 2022, including the development pipeline containing the Platinum project; ENGIE’s North American development arm subsequently advanced the project under Platinum Energy Storage LLC.","official_url":"https://www.engie-na.com/"} — Engie seeks to reassure locals on safety of 300MW BESS project in Texas - Energy-Storage.News · confidence: medium
- Commercial parties.2: {"relationship":"Predecessor developer and portfolio seller","name":"Belltown Power U.S.","detail":"Initially developed the project through BT Block Storage LLC and sold its U.S. solar and storage development portfolio to ENGIE in October 2022.","official_url":"https://belltownpower.com/"} — ENGIE acquires 6 GW of solar and battery storage capacity projects from Belltown Power U.S. and significantly strengthens its renewable development pipeline - ENGIE North America · confidence: medium
- Commercial parties.2: {"relationship":"Predecessor developer and portfolio seller","name":"Belltown Power U.S.","detail":"Initially developed the project through BT Block Storage LLC and sold its U.S. solar and storage development portfolio to ENGIE in October 2022.","official_url":"https://belltownpower.com/"} — Engie seeks to reassure locals on safety of 300MW BESS project in Texas - Energy-Storage.News · confidence: medium
- Commercial parties.5: {"relationship":"ISO/RTO and grid operator","name":"Electric Reliability Council of Texas","detail":"ERCOT identifies the project’s standalone resources as PLATINUM_BES1 and PLATINUM_BES2 and administers the project’s interconnection and commercial-operation process.","official_url":"https://www.ercot.com/"} — Source · confidence: high
- Commercial parties.6: {"relationship":"Battery energy-storage equipment OEM","name":"Sungrow Power Supply Co., Ltd.","detail":"The interconnection configuration identifies Sungrow SC4000UD-MV-US BESS equipment for the project.","official_url":"https://www.sungrowpower.com/ca/en/products/power-conversion-systems/b-sc4000ud-mv-us"} — Source · confidence: medium
- Commercial parties.7: {"relationship":"Transmission service provider listed in the Texas PUC registration","name":"Rayburn Electric Cooperative","detail":"Listed as a transmission service provider associated with the Platinum Energy Storage registration in Fannin County and the ERCOT North region.","official_url":"https://www.rayburnelectric.com/"} — Source · confidence: medium
- Quality notes.0: Capacity figures use different rating bases: EIA reports 300.0 MW net summer capacity, ERCOT lists 153 MW and 157 MW resources, and the interconnection amendment specifies 348 MVA gross capacity and 309.53 MW net plant output. — Electric Power Monthly - U.S. Energy Information Administration (EIA) · confidence: medium
- Quality notes.0: Capacity figures use different rating bases: EIA reports 300.0 MW net summer capacity, ERCOT lists 153 MW and 157 MW resources, and the interconnection amendment specifies 348 MVA gross capacity and 309.53 MW net plant output. — Source · confidence: medium
- Quality notes.0: Capacity figures use different rating bases: EIA reports 300.0 MW net summer capacity, ERCOT lists 153 MW and 157 MW resources, and the interconnection amendment specifies 348 MVA gross capacity and 309.53 MW net plant output. — ~ > X E T ~ · confidence: medium
- Quality notes.0: Capacity figures use different rating bases: EIA reports 300.0 MW net summer capacity, ERCOT lists 153 MW and 157 MW resources, and the interconnection amendment specifies 348 MVA gross capacity and 309.53 MW net plant output. — Engie seeks to reassure locals on safety of 300MW BESS project in Texas - Energy-Storage.News · confidence: medium

## Timeline

- 2021-07 — Predecessor project company established
  Belltown Power incorporated BT Block Storage LLC as the business subsidiary used for the Fannin County project.
  Source: Engie seeks to reassure locals on safety of 300MW BESS project in Texas - Energy-Storage.News (https://www.energy-storage.news/engie-seeks-to-reassure-locals-on-safety-of-300mw-bess-project-in-texas/)
- 2022-10-27 — Acquisition from Belltown Power U.S.
  ENGIE North America announced the acquisition of Belltown Power U.S.’s 6 GW portfolio of 33 solar, paired-storage, and standalone-storage development projects. Project-specific consideration was not disclosed, and the transaction announcement did not separately allocate value to Platinum Storage.
  Source: ENGIE acquires 6 GW of solar and battery storage capacity projects from Belltown Power U.S. and significantly strengthens its renewable development pipeline - ENGIE North America (https://www.engie-na.com/engie-acquires-6-gw-of-solar-and-battery-storage-capacity-projects-from-belltown-power-u-s-and-significantly-strengthens-its-renewable-development-pipeline/)
- 2022-11-17 — Interconnection agreement executed
  The ERCOT Standard Generation Interconnection Agreement between Oncor Electric Delivery Company LLC and Platinum Energy Storage LLC was dated November 17, 2022.
  Source: ~ > X E T ~ (https://interchange.puc.texas.gov/Documents/35077_1767_1378345.PDF)
- 2023-08-08 — Construction notice milestone
  The interconnection schedule identified August 8, 2023 as the date by which Platinum Energy Storage was to provide notice to commence construction and the required security.
  Source: ~ > X E T ~ (https://interchange.puc.texas.gov/Documents/35077_1767_1378345.PDF)
- 2024-02-29 — Interconnection amendment and final configuration
  Oncor and Platinum Energy Storage executed an amendment to the interconnection agreement. It identified the Valley South Switching Station point of interconnection and specified 348 MVA gross BESS capacity with 309.53 MW net plant output.
  Source: ~ > X E T ~ (https://interchange.puc.texas.gov/Documents/35077_1767_1378345.PDF)
- 2024-12-04 — Exempt wholesale generator status became effective
  FERC’s notice listed Platinum Energy Storage LLC under docket EG24-278-000 in its notice of effectiveness of Exempt Wholesale Generator status.
  Source: 99241 (https://www.govinfo.gov/content/pkg/FR-2024-12-10/pdf/2024-28952.pdf)
- 2025-03-03 — Scheduled commercial-operation date
  The 2024 interconnection schedule listed March 3, 2025 as the scheduled commercial-operation date.
  Source: ~ > X E T ~ (https://interchange.puc.texas.gov/Documents/35077_1767_1378345.PDF)
- 2025-05-23 — Construction nearing completion
  A project report stated that ENGIE was nearing completion of the 300 MW standalone BESS near Savoy and identified the project as having been developed initially by Belltown Power.
  Source: Engie seeks to reassure locals on safety of 300MW BESS project in Texas - Energy-Storage.News (https://www.energy-storage.news/engie-seeks-to-reassure-locals-on-safety-of-300mw-bess-project-in-texas/)
- 2026-02 — EIA operating record
  EIA’s February 2026 operating-company table listed Platinum Storage as an operating battery plant with plant ID 69044, generator ID PLAT, and 300.0 MW of net summer capacity.
  Source: Electric Power Monthly - U.S. Energy Information Administration (EIA) (https://www.eia.gov/electricity/monthly/epm_table_grapher.php?t=table_6_03)

## Sources

- [Source](https://interchange.puc.texas.gov/Documents/57211_1_1435472.PDF) — interchange.puc.texas.gov · tier regulatory
- [ENGIE North America | Clean Energy Solutions](https://www.engie-na.com/) — engie-na.com · tier other
- [Electric Power Monthly - U.S. Energy Information Administration (EIA)](https://www.eia.gov/electricity/monthly/epm_table_grapher.php?t=table_6_03) — eia.gov · tier regulatory
- [~ > X E T ~](https://interchange.puc.texas.gov/Documents/35077_1767_1378345.PDF) — interchange.puc.texas.gov · tier regulatory
- [Monthly Outlook for Resource Adequacy (MORA)](https://www.ercot.com/files/docs/2026/07/02/MORA_September2026.pdf) — ercot.com · tier regulatory
- [99241](https://www.govinfo.gov/content/pkg/FR-2024-12-10/pdf/2024-28952.pdf) — govinfo.gov · tier regulatory
- [PDP B SC4000UD-MV-US - SUNGROW](https://www.sungrowpower.com/ca/en/products/power-conversion-systems/b-sc4000ud-mv-us) — sungrowpower.com · tier other
- [Rayburn Electric Cooperative](https://www.rayburnelectric.com/) — rayburnelectric.com · tier other
- [Source](https://www.ercot.com/files/docs/2025/09/02/Stand-Alone-Generation-Resources-as-of-09.01.25-v2.pdf) — ercot.com · tier regulatory
- [Fannin County battery facility sparks a lawsuit | Texas Headline | kten.com](https://www.kten.com/news/texas-headlines/fannin-county-battery-facility-sparks-a-lawsuit/article_4c12fdcd-78d9-449d-9fb0-a1cc6c69f17a.html) — kten.com · tier other
- [Source](https://interchange.puc.texas.gov/Documents/53385_2600_1454590.PDF) — interchange.puc.texas.gov · tier regulatory
- [Source](https://www.prnewswire.com/news-releases/sungrow-supplies-a-100-mw-energy-storage-project-in-texas-301213083.html) — prnewswire.com · tier other
- [Engie seeks to reassure locals on safety of 300MW BESS project in Texas - Energy-Storage.News](https://www.energy-storage.news/engie-seeks-to-reassure-locals-on-safety-of-300mw-bess-project-in-texas/) — energy-storage.news · tier other
- [Source](https://agendasuite.org/iip/fannin/file/getfile/24102) — agendasuite.org · tier other
- [ENGIE acquires 6 GW of solar and battery storage capacity projects from Belltown Power U.S. and significantly strengthens its renewable development pipeline - ENGIE North America](https://www.engie-na.com/engie-acquires-6-gw-of-solar-and-battery-storage-capacity-projects-from-belltown-power-u-s-and-significantly-strengthens-its-renewable-development-pipeline/) — engie-na.com · tier other
- [ENGIE acquires 6 GW of solar and battery storage capacity projects from Belltown Power U.S. and significantly strengthens its renewable development pipeline](https://www.prnewswire.com/news-releases/engie-acquires-6-gw-of-solar-and-battery-storage-capacity-projects-from-belltown-power-us-and-significantly-strengthens-its-renewable-development-pipeline-301660934.html) — prnewswire.com · tier other
- [Interchange - Filings](https://interchange.puc.texas.gov/Search/Filings?ControlNumber=57211) — interchange.puc.texas.gov · tier regulatory
- [~* TEX>~ - PUC Interchange - Texas.gov](https://interchange.puc.texas.gov/Documents/58237_1_1507204.PDF) — interchange.puc.texas.gov · tier regulatory

## Data quality

- Capacity figures use different rating bases: EIA reports 300.0 MW net summer capacity, ERCOT lists 153 MW and 157 MW resources, and the interconnection amendment specifies 348 MVA gross capacity and 309.53 MW net plant output. The project has multiple schedule and operating milestones rather than one consistently reported commercial-operation date: the interconnection agreement scheduled commercial operation for March 3, 2025, an ERCOT report cited August 19, 2025 for commercial-operations clearance, and EIA records the plant as operating in February 2026. No documented post-commissioning expansion, retirement, or repowering milestone was identified; the 2024 interconnection amendment documents the project’s configuration and ratings rather than a later expansion.

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