- Combustion
- Retired
- 10 · 100 · 1,000 MW
Map
- Combustion
- Retired
Mobile Unit: location. Basemap: Protomaps, © OpenStreetMap contributors, ODbL.
Mobile Unit
Power plant · Oil
Key facts
Power plant · Oil Retired- Capacity
- Capacity: sourceEIA-860M · Open licenseMW
- Commissioned
- 1955
- Net generation, 2019
- -92 MWh
- Grid
- 69 kV to NorthWestern Energy - (SD) (SWPP)
- Location
- Beadle County, South Dakota
- Operated by
- NorthWestern Energy - (SD)SourceEIA-860M Preliminary Monthly Electric Generator Inventory
Output
- Oil
Details
Who’s behind it
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- Technology
- Oil source: “Petroleum Liquids”
- Age
- 71 years since 1955
1 attribute from EIA-860M Preliminary Monthly Electric Generator Inventory
| Attribute | Value |
|---|---|
| Balancing authority code | SWPP |
Retirement
EIA-860M September 2026StatusEvery generator EIA lists at this plant has retired. As of EIA-860M for September 2026.- Retired
- December 2019
- First unit retired
- September 2008
- Capacity retired
- 4.2 MW
- Generators retired
- 3
| Generator | Technology | Nameplate | State | Date |
|---|---|---|---|---|
| 1 | Petroleum Liquids | 0.5 MW | Retired | September 2008 |
| 2 | Petroleum Liquids | 1.7 MW | Retired | December 2019 |
| 3 | Petroleum Liquids | 2 MW | Retired | December 2019 |
Grid
EIA-860 2025Grid fieldsAs the plant reported them to EIA-860 for 2025 (Schedule 2).- Grid voltage at the plant
- 69 kV
- Transmission or distribution system owner
- NorthWestern Energy - (SD)
- Balancing authority
- Southwest Power Pool
- NERC region
- MRO
Transmission lines within 25 km (1)
Can the connection be reused?
A plant that retires usually leaves its substation, transmission connection and interconnection agreement behind, and those may be reusable by a new project at the same site. FERC Order No. 845 lets an interconnection customer use surplus interconnection service at an existing site, and some transmission providers' tariffs let a replacement resource take over a retiring unit's interconnection service, usually within a set time after the retirement. Whether any such right still exists here, who holds it and on what terms depends on the owner, the transmission provider and timing; this page does not establish any of that.
Timeline
- Stated Units 2, 3 scheduled to retire, 3.7 MW · EIA-860M
- Stated Unit 1 scheduled to retire, 0.5 MW · EIA-860M
- In service · EIA-860M
Sources
4 sourcesSources EIA-860M · LBNL · EIA · EIA-860M Preliminary Monthly Electric Generator Inventory
Sources
- EIA-860M Preliminary Monthly Electric Generator Inventory
- LBNL — A Harmonized Geospatial Dataset of U.S. Transmission Lines: Linking FERC Form 1 and HIFLD, 1994-2024 (OEDI submission 8742)Yin, Nait Belaid & Heleno (2026), Lawrence Berkeley National Laboratory, OEDI, CC BY 4.0: A Harmonized Geospatial Dataset of U.S. Transmission Lines: Linking FERC Form 1 and HIFLD, 1994-2024. Modified by Inframation: HIFLD-side fields only, names re-cased, coordinates rounded.
- EIA Open Data bulk file — Electricity (ELEC.zip; monthly plant net generation and fuel consumption since 2001)Source: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)
- EIA-860M Preliminary Monthly Electric Generator Inventory