JM Shafer Generating Station
Natural gas power plant · Weld County, Colorado
Nameplate capacity
397 MW
Rank in Colorado
#17
of 326 plants
In service since
1994
June 1994
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combined Cycle
- Operator
- Tri-State G & T Assn, Inc
- County
- Weld County
- Generating units
- 7
- Share of state capacity
- 1.73%
- Rank among natural gas plants in Colorado
- #9 of 30
- EIA plant code
- 50707
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| LMA | Natural Gas Fired Combined Cycle | 59 MW | 272 MW | 1994 | Operating |
| LMB | Natural Gas Fired Combined Cycle | 59 MW | — | 1994 | Operating |
| LMC | Natural Gas Fired Combined Cycle | 59 MW | — | 1994 | Operating |
| LMD | Natural Gas Fired Combined Cycle | 59 MW | — | 1994 | Operating |
| LME | Natural Gas Fired Combined Cycle | 59 MW | — | 1994 | Operating |
| STA | Natural Gas Fired Combined Cycle | 52 MW | — | 1994 | Operating |
| STB | Natural Gas Fired Combined Cycle | 52 MW | — | 1994 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Colorado
| Spindle Hill Energy Center | Natural gas | 420 MW |
| Blue Spruce Energy Center | Natural gas | 398 MW |
| Thunder Wolf Energy Center Hybrid | Solar | 348 MW |
| Cedar Creek Wind | Wind | 301 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 397 MW solar plant and a 397 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Colorado power plants · What Colorado actually generates