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- Clean firm
- Wind & solar
- Under construction
- Operating
- 10 · 100 · 1,000 MW
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- Clean firm
- Wind & solar
- Under construction
- Operating
Millstone: location and 2 exact-grade projects within 25 km. Basemap: Protomaps, © OpenStreetMap contributors, ODbL.
Millstone
Power plant · Nuclear
Key facts
Power plant · Nuclearran 84% of 2025 Operating- Capacity
- Capacity: sourceEIA-860M · Open licenseMW
- Commissioned
- 1975
- Net generation, 2025
- 16,708,717 MWh
- Grid
- 345 kV to NSTAR Electric Company (ISNE)
- Location
- New London County, Connecticut
- Operated by
- Dominion Energy Nuclear Conn Inc
Output
- Nuclear
Details
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- Technology
- Nuclear source: “Nuclear”
- Age
- 51 years since 1975
- Heat rate
- 10,443 Btu/kWh 2025
All 7 attributes from EIA-860M Preliminary Monthly Electric Generator Inventory
| Attribute | Value |
|---|---|
| Gem |
|
| Grid |
|
| Fuel burned (MMBtu), 2025 | 174,495,593 |
| Capacity factor, 2025 | 0.844 |
| Heat rate (Btu/kWh), 2025 | 10,443.4 |
| Net generation (MWh), 2025 | 16,708,717 |
| Balancing authority code | ISNE |
Ownership
3 companies4| Company | Role | Share | As of | Source |
|---|---|---|---|---|
| Dominion Energy Nuclear Conn Inc | Operator | EIA-860M | ||
| Massachusetts Mun Wholes Electric Co | Owner | 2.9% | 31 Dec 2025 | EIA-860 |
| Dominion Energy Nuclear Conn Inc | Owner | 55.8% | 31 Dec 2025 | EIA-860 |
| Green Mountain Power Corp | Owner | 1.0% | 31 Dec 2025 | EIA-860 |
Timeline
- In service · EIA-860M
Sources
5 sourcesSources EIA-860M · GEM · EIA · EIA-860M Preliminary Monthly Electric Generator Inventory · EIA-860 Annual Electric Generator Report — Schedule 4 Owner (ownership shares per generator), plus Plant/Generator schedules
Sources
- EIA-860M Preliminary Monthly Electric Generator Inventory
- Global Energy Monitor — Global Integrated Power Tracker (unit-level power plants, eight technologies, all statuses)Global Integrated Power Tracker, Global Energy Monitor, September 2026 release (https://globalenergymonitor.org/projects/global-integrated-power-tracker), CC BY 4.0. Modified by Inframation: TransitionZero-sourced rows removed; statuses and technologies mapped to Inframation's vocabulary; figures aggregated. Copyright © Global Energy Monitor. Global Integrated Power Tracker, September 2026 release. Distributed under a Creative Commons Attribution 4.0 International License.
- EIA Open Data bulk file — Electricity (ELEC.zip; monthly plant net generation and fuel consumption since 2001)Source: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)
- EIA-860M Preliminary Monthly Electric Generator Inventory
- EIA-860 Annual Electric Generator Report — Schedule 4 Owner (ownership shares per generator), plus Plant/Generator schedules
Around this plant
Nearby
within 25 km| Project | Kind | Away | MW |
|---|---|---|---|
| Groton Flanders Road Landfill Under construction | Solar | 10.8 km | 5 |
| Subase Microgrid Project Postponed | Gas, reciprocating engine | 12.0 km | 13.1 |