In Twin Falls County, Idaho (ID). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.

How big is Filer BESS?

2 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.

EIA-860M names Idaho Power Co as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.

Is this the same as Filer BESS LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Idaho Power Co here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Filer BESS LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Filer BESS still running?

EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.

Filer BESS

Filer BESS is a 2 MW battery storage project in Twin Falls County, Idaho, operated by Idaho Power Co. EIA-860M lists 1 generating unit here. Its unit entered service in 2025.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Nameplate capacity: 2 MW; 2 MW net summer
Generating units: 1
In service: 2025
EIA plant ID: 66328

Where it is

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County: Twin Falls County, Idaho
Coordinates: 42.5716, -114.5951
Balancing authority: IPCO
Sector: Electric Utility

Units, technology and status

Operator of record: Idaho Power Co
Primary energy source: Battery
Technologies: Batteries
Status: Operating

Every plant Idaho Power Co reports to EIA →

Filer BESS: FAQ

Where is Filer BESS?: In Twin Falls County, Idaho (ID). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
How big is Filer BESS?: 2 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
Who owns Filer BESS?: EIA-860M names Idaho Power Co as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
Is this the same as Filer BESS LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Idaho Power Co here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Filer BESS LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Filer BESS still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.