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Columbia Generating Station - 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 # 58163
2026-02-13 2026-02-16 4 230d - -
Unscheduled
2025-06-24 2025-06-28 5 11d - -
Scheduled
2025-04-12 2025-06-13 63 664d 2025-05-11 -29d
Scheduled
2023-05-06 2023-06-18 44 510d 2023-05-05 +1d
Unscheduled
2021-12-07 2021-12-12 6 173d - -
Scheduled
2021-05-09 2021-06-17 40 692d 2021-05-07 +2d
Scheduled
2019-05-12 2019-06-17 37 354d 2019-05-15 -3d
Scram # 53410
2018-05-19 2018-05-23 5 261d - -
Scram # 52918
2017-08-21 2017-08-31 11 67d - -
Scheduled
2017-05-14 2017-06-15 33 141d 2017-05-13 +1d
Scram # 52442
2016-12-19 2016-12-24 6 264d - -
Scram # 51826
2016-03-29 2016-03-30 2 278d - -
Scheduled
2015-05-10 2015-06-25 47 687d 2015-05-06 +4d
Scheduled
2013-05-12 2013-06-22 42 349d 2013-05-09 +3d
Unscheduled
2012-05-21 2012-05-28 8 245d - -
Scheduled
2011-04-03 2011-09-19 170 507d 2011-04-06 -3d
Unscheduled
2009-11-08 2009-11-12 5 38d - -
Unscheduled
2009-09-29 2009-10-01 3 29d - -
Unscheduled
2009-08-06 2009-08-31 26 37d - -
Unscheduled
2009-06-27 2009-06-30 4 7d - -
Scheduled
2009-05-09 2009-06-20 43 86d 2009-05-10 -1d
Unscheduled
2009-02-09 2009-02-12 4 82d - -
Unscheduled
2008-11-16 2008-11-19 4 85d - -
Unscheduled
2008-08-22 2008-08-23 2 419d - -
Unscheduled
2007-06-29 2007-06-30 2 6d - -
Scheduled
2007-05-13 2007-06-23 42 31d 2007-05-12 +1d
Unscheduled
2007-04-10 2007-04-12 3 155d - -
Unscheduled
2006-11-01 2006-11-06 6 489d - -
Unscheduled
2005-06-24 2005-06-30 7 3d - -
Unscheduled
2005-06-16 2005-06-21 6 7d - -
Scheduled
2005-05-07 2005-06-09 34 260d 2005-05-06 +1d
Unscheduled
2004-08-18 2004-08-20 3 2d - -
Unscheduled
2004-08-16 2004-08-16 1 2d - -
Unscheduled
2004-07-31 2004-08-14 15 395d - -
Unscheduled
2003-07-01 2003-07-02 2 7d - -
Scheduled
2003-05-04 2003-06-24 52 52d 2003-05-20 (Model) -16d (Model)
Unscheduled
2003-03-01 2003-03-13 13 371d - -
Unscheduled
2002-02-15 2002-02-23 9 198d - -
Unscheduled
2001-07-27 2001-08-01 6 26d - -
Unscheduled
2001-06-29 2001-07-01 3 5d - -
Scheduled
2001-05-20 2001-06-24 36 241d 2001-04-17 (Model) +33d (Model)
Unscheduled
2000-09-19 2000-09-21 3 14d - -
Unscheduled
2000-09-02 2000-09-05 4 61d - -
Unscheduled
2000-06-27 2000-07-03 7 249d - -
Unscheduled
1999-09-19 1999-10-22 34 80d - -
Scheduled
1999-04-18 1999-07-01 75 - - -
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