Vermont Yankee
DecommissionedNorthStar Group Services·Vernon, VT·BWR·506 MWe
?
Current reactor power level from the most recent NRC daily report.
Shut Down
?
Days of continuous operation since the last outage ended. Ranked against all operating units.
4,293
Current Run
days
?
Longest recorded period of continuous operation between outages.
4,293
Record Run
days
?
Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (464 days for this 18-month cycle unit) with no trips to 0% power.
4
B2B Runs
?
Lifetime capacity factor: average power level across all recorded days (100% = always at full power). Ranked against all NRC-tracked units.
92.2%
Capacity Factor
?
Total NRC-reported scram events (emergency reactor shutdowns). Ranked fleet-wide — fewer scrams = better rank.
0
Scrams
?
Years since commercial operation began.
42.1
Operating Age
years
Excellence Score, Records & Plant Facts
Breaker-to-Breaker Runs 4 runs
Breaker-to-breaker runs measure continuous operation between refueling outages using a cycle-adjusted threshold (90% of cycle length minus RFO duration). An active streak means the unit has been running continuously since the last refueling with no trips to 0% power.
Vermont Yankee has logged 4 breaker-to-breaker runs, continuous stretches from one refueling to the next with no trip to zero power. Its longest ran 634 days, and its runs average 552 days.
634
Best Run (days)
RFO 30 (2013-04-05) → 2014-12-30
552
Avg Run (days)
All Runs
| 2013-04-05 | 2014-12-30 | 634 days | RFO 30 → ? |
| 2011-11-03 | 2013-03-10 | 493 days | RFO 29 → RFO 30 |
| 2008-11-10 | 2010-04-25 | 531 days | RFO 27 → RFO 28 |
| 2005-11-12 | 2007-05-14 | 548 days | RFO 25 → RFO 26 |
About This Site
Written by NukeWorker from public records: facts that do not change. Operator, status and capacity come from the live data elsewhere on this page. Sources: Wikipedia: Vermont Yankee Nuclear Power Plant.
Vermont Yankee Nuclear Power Plant was on the Connecticut River at Vernon, Vermont, which supplied its cooling water. It had one General Electric BWR-4 boiling water reactor with Mark I containment.
Read more
The Vermont Yankee Nuclear Power Corporation was the original owner, and the plant entered commercial operation on November 30, 1972. Entergy bought it in 2002. In February 2010 tritium was found in groundwater near the reactor, traced to steam pipes and repaired, and the Vermont Senate voted 26 to 4 against allowing the Public Service Board to consider re-certifying the plant beyond 2012. Entergy shut the reactor down on December 29, 2014. All spent fuel was in dry storage casks by August 2018, and two cooling towers were demolished in July 2019.
Facility Statistics
Key performance and lifecycle metrics calculated from NRC operational data. Includes operating age, construction timeline, capacity factor, efficiency, generation totals, and reliability records.
Vermont Yankee has operated for about 42.1 years and averaged a 92.2% lifetime capacity factor, generating roughly 65.5 TWh of electricity. Its longest unbroken run reached 4,293 days.
Lifecycle & Tenure
Operating Age: 42.1 Yrs
Build Time: 5 Yrs
Lic. Remaining: N/A Yrs
Production & Power
Lifetime CF: 92.2%
Efficiency: 31.8%
Generated: 65.5 TWh
Reliability & Outages
Record Run: 4,293 Days
Refuelings: 10
Avg Startup: 4.2 Days
Ownership & Construction
The utility or company that owns and operates the facility, the architect-engineer responsible for plant design, and the primary construction contractor. Click names to view all facilities by that entity on the map.
Ownership, operation and management history
| Date | Change | From | To |
|---|---|---|---|
| Jul 2002 | Sold | Vermont Yankee Nuclear Power Corp | Entergy |
| Jan 11, 2019 | Sold | Entergy | NorthStar |
Publicly Traded
No — Privately held
Technical Specs
Reactor design specifications including type (PWR/BWR), containment design, nuclear steam supply system manufacturer, thermal and electrical power ratings, and current operational status.
Reactor Type:
BWR
Containment:
BWR-MARK 1
NSS Supplier:
GE 4
Turbine Supplier:
GENERAL ELECTRIC CO. IAEA
Thermal Power:
1593 MWt
Net Capacity:
506 MWe
Gross Capacity:
635 MWe IAEA
Design Capacity:
514 MWe IAEA
Efficiency:
31.8%
Status:
Decommissioned
Lifetime Output:
163.4 TWh through 2025 IAEA
Licensing
NRC licensing history including docket number, license type and number, construction permit date, operating license issuance, commercial operation date, license renewal, and expiration date.
Docket #:
05000271
License #:
DPR-28
License Type:
OL-FP
Const. Permit:
1967-12-11
Construction Start:
1967-12-11 IAEA
Operating Lic:
1973-02-28
First Criticality:
1972-03-24 IAEA
Grid Connection:
1972-09-20 IAEA
Commercial Op:
1972-11-30
License Renewed:
2011-03-21
License Exp:
2012-03-21