Where is Aberdeen CT?

In Brown 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 Aberdeen CT?

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

Who owns Aberdeen CT?

EIA-860M names NorthWestern Energy - (SD) 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 Aberdeen CT LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — NorthWestern Energy - (SD) 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 "Aberdeen CT LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Aberdeen CT still running?

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

Aberdeen CT

Aberdeen CT is a 111 MW natural gas power plant in Brown County, South Dakota, operated by NorthWestern Energy - (SD). EIA-860M lists 2 generating units here, inside SPP. Its units entered service between 1978 and 2013.

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: 111 MW; 72.5 MW net summer
Generating units: 2
In service: 1978–2013
EIA plant ID: 3338

Where it is

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County: Brown County, South Dakota
Coordinates: 45.4299, -98.494
Balancing authority: SWPP
Sector: Electric Utility

Units, technology and status

Operator of record: NorthWestern Energy - (SD)
Primary energy source: Natural gas
Technologies: Natural Gas Fired Combustion Turbine, Petroleum Liquids
Status: Operating

This site runs on more than one energy source. EIA-860M capacity splits: Natural gas 82 MW, Petroleum 29 MW. It is filed here under Natural gas, the source with the most capacity.

Every plant NorthWestern Energy - (SD) reports to EIA →

Aberdeen CT: FAQ

Where is Aberdeen CT?: In Brown 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 Aberdeen CT?: 111 MW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.
Who owns Aberdeen CT?: EIA-860M names NorthWestern Energy - (SD) 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 Aberdeen CT LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — NorthWestern Energy - (SD) 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 "Aberdeen CT LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Aberdeen CT still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.