Data last collected:
PowerPlantFactsEvidence report · prepared 19 October 2026https://powerplantfacts.com/entity/566
EIA plant 566
Waterford · New London · CT
Millstone
Operated by Dominion Energy Nuclear Conn Inc
Published location
Where is Millstone?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
41.310700, -72.167700
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Capacity is not generation. Nameplate MW describes equipment; annual MWh describes recorded output. Proposed and retired units are not added to operating capacity.
Equipment mix
Operating capacity by technology
Grouped from this plant’s represented generator records. Use the CT plant index for regional peers.
See the evidence
Electricity output across the year
Monthly net generation shows the seasonal shape of this plant's represented output. A negative value is retained when the source reports net consumption.
11,263,781
21,466,547
31,568,155
41,517,438
51,557,143
61,508,201
71,548,361
81,514,012
91,070,529
10972,997
111,321,169
121,561,972
MWh net generation · 2024 final edition · EIA 923 represented operating rows. 12 of 12 supplied rows shown; 0 missing values omitted. Months with no reported numeric value are omitted, not treated as zero.
Read the chart as a table
| Record | MWh net generation |
|---|---|
| 1 | 1,263,781 |
| 2 | 1,466,547 |
| 3 | 1,568,155 |
| 4 | 1,517,438 |
| 5 | 1,557,143 |
| 6 | 1,508,201 |
| 7 | 1,548,361 |
| 8 | 1,514,012 |
| 9 | 1,070,529 |
| 10 | 972,997 |
| 11 | 1,321,169 |
| 12 | 1,561,972 |
2024 monthly net generation
| Month | Net generation |
|---|---|
| 1 | 1,263,781 MWh |
| 2 | 1,466,547 MWh |
| 3 | 1,568,155 MWh |
| 4 | 1,517,438 MWh |
| 5 | 1,557,143 MWh |
| 6 | 1,508,201 MWh |
| 7 | 1,548,361 MWh |
| 8 | 1,514,012 MWh |
| 9 | 1,070,529 MWh |
| 10 | 972,997 MWh |
| 11 | 1,321,169 MWh |
| 12 | 1,561,972 MWh |
Operating generators
| ID | Technology | Fuel | MW | Status |
|---|---|---|---|---|
| 3 | Nuclear | NUC | 1,350 | OP |
| 2 | Nuclear | NUC | 909.9 | OP |
Continue exploring
Similar-capacity plants in the same state
Identity, technology and limitations
EIA plant ID
566
Sector
IPP Non-CHP
Water source
Long Island Sound
Data edition
2024-final
Use this record
Questions this evidence can answer
01What exactly is this record?
Use the name, place, date and identifiers above to confirm that you have the right Millstone power plant: capacity and generation | PowerPlantFacts record.
02What does the evidence establish?
Read the reported values with their units, coverage dates and source notes. Keep observed facts separate from estimates or interpretation.
03What should I verify next?
Follow the primary-source links and check the limitations before using this evidence for a decision, comparison or citation.
A closer look at Millstone
Variation in the published months
Across 12 numeric monthly generation entries, 3 has the highest recorded value (1,568,155 MWh) and 10 the lowest (972,997 MWh). Their difference is 595,158 MWh. Missing months have not been treated as zero.
Generator capacity in different operating conditions
| Generator ID | Technology | Nameplate MW | Summer MW | Winter MW | Minimum load MW |
|---|---|---|---|---|---|
| 2 | Nuclear | 909.9 | 861.0 | 869.8 | 50.0 |
| 3 | Nuclear | 1350.0 | 1243.2 | 1251.3 | 65.0 |
EIA-860 2024 final source. Ratings describe capacity, not actual generation or availability. Missing ratings are not zero.
Source: US Energy Information Administration Form EIA-860 2024 plant and operable-generator workbooks; archive 2024. US EIA-authored information is generally public domain; cite EIA, preserve third-party exceptions, changes and no-endorsement context. Source-specific derived data.