Seminoe — Plant Summary
- EIA Plant ID
- 4182
- Capacity
- 51.6 MW
- Primary Fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Status
- Operating
- Location
- Carbon, WY
- Operating Since
- 1939
- Generators
- 3
- Operator
- U S Bureau of Reclamation
- Parent Company
- —
- Annual Generation
- 136,952 MWh
- Capacity Factor
- 30.1%
- Balancing Authority
- Western Area Power Administration UGP West
- ISO/RTO
- —
- NERC Region
- WECC
Seminoe
OperatingHydro
Ranked #2 of 16 Hydro plants in WY#294 of 1454 nationally
51.6 MW Hydro operating in Carbon, WY — Western Area Power Administration UGP West
EIAGEMWD
51.6 MW
Nameplate Capacity
3
Generators
units
Conventional Hydroelectric
Technology
1939
Operating Since
Location
Ownership & Operator
Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | U S Bureau of Reclamation | US Bureau of Reclamation | United States Bureau of Reclamation |
| Owner(s) | U S Bureau of Reclamation | US Bureau of Reclamation | United States Bureau of Reclamation |
| Status | Operating | operating | — |
Ownership Chain
GEM identifies the owner as US Bureau of Reclamation
This entity is not yet in the GEM ownership database — chain unavailable.
About
Seminoe Dam is a concrete thick-arch dam on the North Platte River in the U.S. state of Wyoming. The dam stores water for irrigation and hydroelectricity generation and is owned and operated by the U.S. Bureau of Reclamation. It is the uppermost dam on the North Platte River and is located directly upstream from the Kortes Dam. It lies in a narrow, isolated canyon formed by the North Platte cutting through the Seminoe Mountains about 40 miles (64 km) northeast of Rawlins. The 295-foot (90 m) dam forms Seminoe Reservoir, which covers more than 20,000 acres (8,100 ha) when full. Seminoe State Park is adjacent to the reservoir. The small village of Seminoe Dam abuts the dam and reservoir and provides residence for the dam attendants and park services personnel.
Read more on WikipediaThe Seminoe hydroelectric plant is located in Carbon County, Wyoming. It is owned and operated by the U.S. Bureau of Reclamation. Commissioned in 1939, the plant has a total capacity of 51.6 MW derived from three generators utilizing conventional hydroelectric technology. Seminoe is the second-largest hydroelectric plant in Wyoming (out of 16) and ranks 298th nationally (out of 1464).
In the most recent year with available data, Seminoe generated 136,952 MWh of electricity, achieving a capacity factor of 30.1%. The plant operates within the Western Electricity Coordinating Council (WECC) NERC region and is under the balancing authority of the Western Area Power Administration UGP West. Its primary fuel source is water (WAT).
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
Western Area Power Administration UGP West
Grid Voltage
115 kV
Regulatory Status
RE
Entity Type
Federal
Sector
Electric Utility
Generation
4.2K MWh
Latest Month
137.0K MWh
Annual Generation
30.1%
Capacity Factor
Jan 2022 – Dec 2024
Financial Data
No financial data available for this plant.
Pricing & Market Data
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
News & Articles (10)Beta
Last updated 2026-03-26
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