Mamm Creek
Battery storage power plant · Garfield County, Colorado
Nameplate capacity
22 MW
Rank in Colorado
#98
of 326 plants
In service since
2025
December 2025
Details
- Primary fuel
- Battery storage
- Technology
- Batteries
- Operator
- AES Clean Energy
- County
- Garfield County
- Generating units
- 2
- Share of state capacity
- 0.10%
- Rank among battery storage plants in Colorado
- #4 of 14
- EIA plant code
- 67322
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| MCESS | Batteries | 11 MW | 10 MW | 2025 | Operating |
| MCSCO | Solar Photovoltaic | 11 MW | 16 MW | 2025 | 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
| Rawhide Prairie Solar Hybrid | Solar | 23 MW |
| High Mesa CO | Battery storage | 22 MW |
| Greater Sandhill I | Solar | 19 MW |
| SR Platte Solar Farm | Solar | 16 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 22 MW solar plant and a 22 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