Nameplate capacity
12 MW
Rank in Maryland
#47
of 234 plants
In service since
1968
May 1968
Details
- Primary fuel
- Other
- Technology
- Petroleum Liquids
- Operator
- Calpine Mid-Atlantic Generation LLC
- County
- Somerset County
- Generating units
- 4
- Share of state capacity
- 0.09%
- Rank among other plants in Maryland
- #10 of 19
- EIA plant code
- 1563
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| CRIS | Petroleum Liquids | 2.9 MW | 2.6 MW | 1968 | Standby/Backup: available for service but not normally used |
| CRS2 | Petroleum Liquids | 2.9 MW | 2.6 MW | 1968 | Standby/Backup: available for service but not normally used |
| CRS3 | Petroleum Liquids | 2.9 MW | 2.6 MW | 1968 | Standby/Backup: available for service but not normally used |
| CRS4 | Petroleum Liquids | 2.9 MW | 2.6 MW | 1968 | Standby/Backup: available for service but not normally used |
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 Maryland
| Annapolis Solar Park, LLC | Solar | 12 MW |
| Kieffer Funk | Solar | 12 MW |
| Rockfish Solar LLC | Solar | 10 MW |
| Roth Rock North Wind Farm, LLC | Wind | 10 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 12 MW solar plant and a 12 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 Maryland power plants · What Maryland actually generates