ISO-NE Nuclear Supply
ISO-NE Today
as of Sep 14, 2026The Generators in ISO-NE
3 units · click any unit for its full record| Unit | Owner | St | MW | Power | MW off | Status | RecordIndividual | Overrun | B2B |
|---|---|---|---|---|---|---|---|---|---|
| Seabrook 1 | NextEra Energy | NH | 1,246 | 100.0% | — | At power | ██ | ██ | ██ |
| Millstone 3 | Dominion Energy | CT | 1,243 | 100.0% | — | At power | ██ | ██ | ██ |
| Millstone 2 | Dominion Energy | CT | 863 | 100.0% | — | At power | ██ | ██ | ██ |
Every reactor scored 0-100 on capacity factor, forced-outage days, streak length, refuel and startup speed, so a published date from a top-decile unit is read differently from one from a bottom-decile unit.
- Operational Excellence per unit
- Projected overrun days
- Breaker-to-breaker streaks
- Rank within reactor type and cycle length
ISO-NE Outage Pipeline
IndividualWhen every unit in ISO-NE comes off line next, on one timeline, with the utility's published dates and our projected ones side by side.
The next eighteen months of outages for this market on a single chart, so overlapping refuelings are obvious before they bite.
- Published + projected start dates
- MW at stake per outage
- Confidence on every date
- Projected overrun days
ISO-NE Fleet Operating Record
IndividualHow the 3 reactors in ISO-NE actually run, as a fleet: the average Operational Excellence score, forced-outage days per unit, how many are in a qualifying breaker-to-breaker run, and which unit in this market is the most and least reliable.
ISO-NE This Season
Full seasonal comparisonEighteen months of MW offline, broken out by market and stacked, so you can see whose supply moved and when.
- Stacked MW-offline history by market
- Per-market forward curve
- Ontario as a parallel fleet
- CSV of any board