Clark (SD)
Clark (SD) is a 3 MW oil-fired power plant in Clark County, South Dakota, operated by NorthWestern Energy - (SD). EIA-860M lists 1 generating unit here, inside SPP. Its unit entered service in 1970.
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
- 2.7 MW
- 2.6 MW net summer
- Generating units
- 1
- In service
- 1970
- EIA plant ID
- 3341
Where it is
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- County
- Clark County, South Dakota
- Coordinates
- 44.8765, -97.7321
- Balancing authority
- SWPP
- Sector
- Electric Utility
Units, technology and status
- Operator of record
- NorthWestern Energy - (SD)
- Primary energy source
- Petroleum
- Technologies
- Petroleum Liquids
- Status
- Standby/Backup
Clark (SD): FAQ
- Where is Clark (SD)?
- In Clark 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 Clark (SD)?
- 3 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Clark (SD)?
- 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 Clark (SD) 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 "Clark (SD) LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Clark (SD) still running?
- EIA-860M files it as "Standby/Backup" for 2026-07. Statuses change monthly, and this page follows the monthly release.