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Prairie Island 1 - 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

Scram # 57813
2025-07-17 2025-07-22 6 182d - -
Scheduled
2024-09-21 2025-01-16 118 223d 2024-09-15 +6d
Unscheduled
2024-02-09 2024-02-11 3 16d - -
Scram # 56803
2023-10-20 2024-01-24 97 345d - -
Scheduled
2022-10-15 2022-11-09 26 732d 2022-10-14 +1d
Scheduled
2020-09-19 2020-10-13 25 20d 2020-09-18 +1d
Scram # 54859
2020-08-27 2020-08-30 4 672d - -
Scheduled
2018-09-22 2018-10-25 34 671d 2018-09-21 +1d
Scheduled
2016-10-16 2016-11-20 36 502d 2016-10-14 +2d
Scram # 51107
2015-06-01 2015-06-02 2 24d - -
Unscheduled
2015-04-08 2015-05-08 31 56d - -
Unscheduled
2015-01-27 2015-02-11 16 32d - -
Unscheduled
2014-12-11 2014-12-26 16 20d - -
Scheduled
2014-10-08 2014-11-21 45 645d 2014-10-08 0d
Scheduled
2012-10-23 2013-01-01 71 66d 2012-10-27 -4d
Unscheduled
2012-08-15 2012-08-18 4 410d - -
Scram # 47017
2011-07-02 2011-07-02 1 22d - -
Scheduled
2011-04-30 2011-06-10 42 525d 2011-04-30 0d
Scheduled
2009-09-12 2009-11-21 71 114d 2009-09-11 +1d
Unscheduled
2009-05-19 2009-05-21 3 290d - -
Unscheduled
2008-08-01 2008-08-02 2 133d - -
Scheduled
2008-02-13 2008-03-21 38 51d 2008-02-28 -15d
Unscheduled
2007-12-22 2007-12-24 3 218d - -
Unscheduled
2007-05-18 2007-05-18 1 3d - -
Unscheduled
2007-05-12 2007-05-15 4 341d - -
Scheduled
2006-04-29 2006-06-05 38 14d 2006-04-28 +1d
Unscheduled
2006-04-15 2006-04-15 1 408d - -
Unscheduled
2005-03-03 2005-03-03 1 5d - -
Unscheduled
2005-02-19 2005-02-26 8 89d - -
Scheduled
2004-09-11 2004-11-22 73 515d 2004-09-10 +1d
Unscheduled
2003-04-15 2003-04-15 1 131d - -
Scheduled
2002-11-16 2002-12-05 20 432d 2002-11-16 0d
Unscheduled
2001-08-02 2001-09-10 40 158d - -
Scheduled
2001-01-20 2001-02-25 37 38d 2001-01-20 0d
Unscheduled
2000-12-02 2000-12-13 12 556d - -
Scheduled
1999-04-17 1999-05-26 40 96d 1999-04-17 0d
Unscheduled
1999-01-06 1999-01-11 6 - - -
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