Old Faithful
Old Faithful is a 2 MW oil-fired power plant in Teton County, Wyoming, operated by NorthWestern Energy (MT wind/thermal). EIA-860M lists 2 generating units here. Its units entered service in 1979.
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
- 2
- In service
- 1979
- EIA plant ID
- 2196
Where it is
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- County
- Teton County, Wyoming
- Coordinates
- 44.4533, -110.8347
- Balancing authority
- NWMT
- Sector
- Electric Utility
Units, technology and status
- Operator of record
- NorthWestern Energy (MT wind/thermal)
- Primary energy source
- Petroleum
- Technologies
- Petroleum Liquids
- Status
- Standby/Backup
Every plant NorthWestern Energy (MT wind/thermal) reports to EIA →
Old Faithful: FAQ
- Where is Old Faithful?
- In Teton County, Wyoming (WY). 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 Old Faithful?
- 2 MW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.
- Who owns Old Faithful?
- EIA-860M names NorthWestern Energy (MT wind/thermal) 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 Old Faithful LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — NorthWestern Energy (MT wind/thermal) 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 "Old Faithful LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Old Faithful still running?
- EIA-860M files it as "Standby/Backup" for 2026-07. Statuses change monthly, and this page follows the monthly release.