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.
Reported plant capacity and configuration.
Primary generation technology.
Platinum Energy Storage LLC · Fannin County · ERCOT
Battery subsystem rating.
Platinum Storage is operating.
345 kV · Oncor Electric Delivery Company LLC
Installed equipment documented in public project records.
Best-supported operating milestone.
Batteries
1.3-hour storage duration
Platinum Storage is operating.
345 kV · Oncor Electric Delivery Company LLC
Similar plants ranked by technology, capacity, and distance.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| PLAT | 348 MW 300 MW summer | Batteries Electricity used for energy storage · BA | Feb 2026 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
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Project milestones and public references behind the asset profile.
Belltown Power incorporated BT Block Storage LLC as the business subsidiary used for the Fannin County project.
ERCOT
ERCOT · Fannin County
EIA-923 reports gross generation and net grid exchange for storage plants. Gross generation is shown as a discharge proxy; it is not a cycle count or conventional capacity factor.
Matched to the latest available ERCOT generation-interconnection queue record. Queue status and completion dates describe the queue record; operating status is verified separately against plant and market registrations.
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
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.
The ERCOT Standard Generation Interconnection Agreement between Oncor Electric Delivery Company LLC and Platinum Energy Storage LLC was dated November 17, 2022.
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.
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.
FERC’s notice listed Platinum Energy Storage LLC under docket EG24-278-000 in its notice of effectiveness of Exempt Wholesale Generator status.
The 2024 interconnection schedule listed March 3, 2025 as the scheduled commercial-operation date.
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.
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.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Platinum Storage has a reported capacity of 348 MW and an energy capacity of 380 MWh. Source: EIA Form 860.
Platinum Storage is a batteries facility in Fannin County, TX, participating in the ERCOT market.
Platinum Storage is in Fannin County, TX, inside the ERCOT balancing area.
Platinum Storage is operated by Platinum Energy Storage LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Platinum Storage reported 82.9 GWh over the twelve months to 2026-06. For a storage plant this is reported gross generation — a discharge proxy, not a cycle count or a conventional capacity factor.
Platinum Storage interconnects at Valley South Switching Station, on the Oncor Electric Delivery Company LLC system.
By capacity, Platinum Storage ranks #8 of 962 operating plants of the same technology nationally. It ranks #1 of 223 in TX.
Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.
