Brownfield & Retired Power Plant Sites in Wyoming
11 catalogued brownfield and retired-generation sites in Wyoming, listed by former capacity. Each carries an existing utility-scale grid interconnection that a new datacenter load may be able to re-use.
At a glance
What kinds of former sites are in Wyoming?
By former use, the list includes 4 natural gas, 3 mine, 2 coal, 1 RCRA hazardous-waste, 1 Superfund. Recorded retirement dates run from March 2014 to April 2022, with 3 retirements in 2015 or later. 10 of 11 sites with a measured distance sit within 2 miles of a transmission substation.
How does Wyoming compare with other states?
Wyoming ranks 43rd of 50 states and DC by number of brownfield and retired-generation sites, out of 2,085 nationally. By recorded capacity (447 MW) it ranks 42nd, against 289,280 MW across all states. The state also has 1,639 scored datacenter candidate sites, 5 of them classed as brownfield sites, averaging 52.2 on the 0–100 DC Readiness scale.
Where in Wyoming are these sites?
- Laramie County · 1
- Weston County · 1
- Campbell County · 1
- Sheridan County · 1
- Carbon County · 1
- Goshen County · 1
All brownfield and retired plant sites in Wyoming
| Site | Former use | Capacity | Retired | County |
|---|---|---|---|---|
| Dave Johnston Mine / Rolling Hills | mine | 119 MW | — | — |
| Dave Johnston Mine / Glenrock Wind I | mine | 119 MW | — | — |
| Cheyenne Prairie Generating Station | gas | 80 MW | — | Laramie |
| Dave Johnston Mine / Glenrock Wind III | mine | 39 MW | — | — |
| Osage (WY) | coal | 35 MW | 2014-03-01 | Weston |
| Neil Simpson | coal | 22 MW | 2014-03-01 | Campbell |
| Chevron Casper Wind Farm | rcra | 17 MW | — | — |
| Arvada | gas | 8 MW | 2021-12-01 | Sheridan |
| Sinclair Oil Refinery | gas | 5 MW | 2022-04-01 | Carbon |
| Warren AFB Wind | superfund | 3 MW | — | — |
| Western Sugar Coop - Torrington | gas | 2 MW | 2019-02-01 | Goshen |
Frequently asked questions
How many retired power plants are in Wyoming?
GridCensus lists 6 retired power plant sites in Wyoming from EIA-860 retirement records. 5 have a recorded retirement date, 3 of them in 2015 or later.
What is the largest retired power plant or brownfield site in Wyoming?
Dave Johnston Mine / Rolling Hills in Glenrock is the largest by recorded capacity, at 118.5 MW. It is followed by Dave Johnston Mine / Glenrock Wind I (118.5 MW) and Cheyenne Prairie Generating Station (80 MW).
Which power plant in Wyoming retired most recently?
Sinclair Oil Refinery has the latest recorded retirement date in the state, April 2022, with 5.2 MW of capacity.
Which county in Wyoming has the most brownfield and retired plant sites?
Laramie County has the most, with 1, followed by Weston County with 1.
How many EPA brownfield sites in Wyoming have completed cleanup?
5 of the 5 EPA-tracked sites listed for Wyoming are recorded as cleanup complete.
Looking for a specific record? The directory lists every brownfield site, A to Z.
More on Wyoming, and states with similar counts
- Datacenter candidate sites in Wyoming· 1,639 sites
- Electric substations in Wyoming· 73 named
- Brownfield candidate sites nationwide
- Brownfield sites by state
- Brownfield sites in Nebraska· 12 sites
- Brownfield sites in South Dakota· 10 sites
- Brownfield sites in Mississippi· 13 sites
- Brownfield sites in Delaware· 9 sites
About this data
Source: EIA-860 retired generating units and EPA RE-Powering America's Land contaminated-site records, as published March 6, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “Brownfield and retired power plant sites in Wyoming”, https://gridcensus.com/brownfield-sites/wyoming (data as of March 6, 2026).
Dataset updated . Screening estimates derived from public data sources.
Go deeper than the public screen
Every site and score for brownfield sites in Wyoming is free to browse. Pro adds Watchtower on 25 sites, alerts when new candidate sites, datacenters or interconnection-queue requests appear in your markets, score and capacity history, and CSV export. Enterprise adds team seats, weekly data files for all 147,272 sites, the REST API and an MCP server for AI tools.