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Monticello - Status & History

Comprehensive reactor performance metrics, cycle analysis, and historical outage data.

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Duration of each outage in days, shown chronologically. Green bars are scheduled refueling outages, red bars are forced/unscheduled. The orange dashed line marks the average duration. Extended outages (>180 days) and D&D periods are excluded.

Outage Duration Trend

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Days between consecutive scheduled refueling outage starts, showing operating cycle regularity. The purple dashed line marks the average cycle length. Most U.S. reactors operate on 18-month (547 day) or 24-month (730 day) cycles.

Cycle Length History

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Monthly capacity factor with outage events overlaid as red bands. Green bars show average power level per month. Toggle to Daily view for raw daily data.

Power History

Unscheduled
2026-02-21 2026-04-02 41 188d - -
Unscheduled
2025-08-14 2025-08-17 4 13d - -
Scram # 57832
2025-07-29 2025-08-01 4 56d - -
Unscheduled
2025-06-02 2025-06-03 2 9d - -
Scheduled
2025-04-19 2025-05-24 36 28d 2025-04-12 +7d
Scram # 57618
2025-03-20 2025-03-22 3 354d - -
Unscheduled
2024-03-27 2024-03-31 5 25d - -
Scram # 56995
2024-02-29 2024-03-02 3 146d - -
Scram # 56759
2023-09-28 2023-10-06 9 138d - -
Scheduled
2023-04-15 2023-05-13 29 16d 2023-04-15 0d
Unscheduled
2023-03-26 2023-03-30 5 423d - -
Unscheduled
2022-01-25 2022-01-27 3 251d - -
Scheduled
2021-04-18 2021-05-19 32 706d 2021-04-17 +1d
Scheduled
2019-04-14 2019-05-13 30 700d 2019-04-13 +1d
Scheduled
2017-04-15 2017-05-14 30 503d 2017-04-15 0d
Scram # 51560
2015-11-24 2015-11-29 6 180d - -
Scheduled
2015-04-13 2015-05-28 46 432d 2015-04-11 +2d
Unscheduled
2014-01-19 2014-02-05 18 185d - -
Scheduled
2013-03-02 2013-07-18 139 156d 2013-03-02 0d
Scram # 48341
2012-09-26 2012-09-27 2 40d - -
Unscheduled
2012-08-15 2012-08-17 3 251d - -
Unscheduled
2011-11-29 2011-12-08 10 2d - -
Scram # 47460
2011-11-20 2011-11-27 8 24d - -
Scram # 47364
2011-10-22 2011-10-27 6 117d - -
Unscheduled
2011-06-25 2011-06-27 3 34d - -
Scheduled
2011-03-05 2011-05-22 79 102d 2011-03-05 0d
Unscheduled
2010-11-18 2010-11-23 6 561d - -
Scheduled
2009-03-15 2009-05-06 53 170d 2009-03-16 -1d
Unscheduled
2008-09-12 2008-09-26 15 505d - -
Scheduled
2007-03-14 2007-04-26 44 50d 2007-03-13 +1d
Unscheduled
2007-01-11 2007-01-23 13 641d - -
Scheduled
2005-03-06 2005-04-10 36 258d 2005-03-05 +1d
Unscheduled
2004-06-19 2004-06-21 3 369d - -
Unscheduled
2003-06-15 2003-06-16 2 21d - -
Scheduled
2003-04-27 2003-05-25 29 457d 2003-04-27 0d
Unscheduled
2002-01-22 2002-01-25 4 40d - -
Scheduled
2001-11-04 2001-12-13 40 10d 2001-11-04 0d
Unscheduled
2001-10-24 2001-10-25 2 204d - -
Unscheduled
2001-02-26 2001-04-03 37 178d - -
Unscheduled
2000-08-28 2000-09-01 5 183d - -
Scheduled
2000-01-06 2000-02-27 53 224d 2000-01-06 0d
Unscheduled
1999-05-09 1999-05-27 19 10d - -
Unscheduled
1999-04-22 1999-04-29 8 - - -
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