Where is Lake Preston?

In Kingsbury County, South Dakota (SD). 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 Lake Preston?

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

Who owns Lake Preston?

EIA-860M names Otter Tail 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 Lake Preston LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Otter Tail 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 "Lake Preston LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Lake Preston still running?

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

Lake Preston

Lake Preston is a 24 MW oil-fired power plant in Kingsbury County, South Dakota, operated by Otter Tail Power Co. EIA-860M lists 1 generating unit here, inside MISO. Its unit entered service in 1978.

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: 24.1 MW; 18.6 MW net summer
Generating units: 1
In service: 1978
EIA plant ID: 3352

Where it is

Loading map…

County: Kingsbury County, South Dakota
Coordinates: 44.3649, -97.3811
Balancing authority: MISO
Sector: Electric Utility

Units, technology and status

Operator of record: Otter Tail Power Co
Primary energy source: Petroleum
Technologies: Petroleum Liquids
Status: Standby/Backup

Every plant Otter Tail Power Co reports to EIA →

Lake Preston: FAQ

Where is Lake Preston?: In Kingsbury County, South Dakota (SD). 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 Lake Preston?: 24 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
Who owns Lake Preston?: EIA-860M names Otter Tail 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 Lake Preston LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Otter Tail 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 "Lake Preston LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Lake Preston still running?: EIA-860M files it as "Standby/Backup" for 2026-07. Statuses change monthly, and this page follows the monthly release.