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GAS POWER PLANTS · OIL-FIRED POWER PLANTSMystic Generating Station
Mystic Generating Station is a 2,844 MW retired power plant in Middlesex County, Massachusetts, operated by Constellation Mystic Power LLC.
Plant statusClosed
- Planning (completed)
- Consented (completed)
- Construction (completed)
- OperatingNov 1957 (completed)
- ClosedJun 2024 (current stage)
Generators
Each generating unit EIA lists at this plant.
| Unit | Technology | Capacity | Status |
|---|---|---|---|
| 7 | Petroleum Liquids | 617 MW | Retired |
| ST85 | Natural Gas Fired Combined Cycle | 315 MW | Retired |
| ST96 | Natural Gas Fired Combined Cycle | 315 MW | Retired |
| GT81 | Natural Gas Fired Combined Cycle | 279 MW | Retired |
| GT82 | Natural Gas Fired Combined Cycle | 279 MW | Retired |
| GT93 | Natural Gas Fired Combined Cycle | 279 MW | Retired |
| GT94 | Natural Gas Fired Combined Cycle | 279 MW | Retired |
| 4 | Petroleum Liquids | 156 MW | Retired |
| 5 | Petroleum Liquids | 156 MW | Retired |
| 6 | Petroleum Liquids | 156 MW | Retired |
| GT1 | Petroleum Liquids | 14 MW | Retired |
Plant details
- Operator
- Constellation Mystic Power LLC
- Location
- Middlesex County, Massachusetts
- Balancing authority
- ISNE
- Sector
- IPP Non-CHP
- Capacity
- Retired: 2,844 MW
- First unit online
- Nov 1957
- EIA plant ID
- 1588
Location
42.3908, -71.0675
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Source: U.S. Energy Information Administration, Form EIA-860M, September 2026. Planned dates are targets reported by the developer and often change. Report a problem