Calvert Cliffs Nuclear Power Plant
Nuclear power plant · Calvert County, Maryland
Nameplate capacity
1,850 MW
Rank in Maryland
#1
of 234 plants
In service since
1975
May 1975
Details
- Primary fuel
- Nuclear
- Technology
- Nuclear
- Operator
- Constellation Nuclear
- County
- Calvert County
- Generating units
- 2
- Share of state capacity
- 13.92%
- Rank among nuclear plants in Maryland
- #1 of 1
- EIA plant code
- 6011
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 2 | Nuclear | 932 MW | 861 MW | 1977 | Operating |
| 1 | Nuclear | 918 MW | 884 MW | 1975 | 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 Maryland
| Chalk Point Power | Natural gas | 1,825 MW |
| Brandon Shores | Coal | 1,370 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 1,850 MW solar plant and a 1,850 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