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Diablo Canyon 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

Unscheduled
2025-12-17 2025-12-18 2 214d - -
Scheduled
2025-04-13 2025-05-17 35 484d 2025-04-13 0d
Unscheduled
2023-12-09 2023-12-16 8 27d - -
Scheduled
2023-10-01 2023-11-12 43 528d 2023-10-04 -3d
Scheduled
2022-03-27 2022-04-21 26 511d 2022-03-27 0d
Scheduled
2020-10-04 2020-11-01 29 568d 2020-10-04 0d
Scheduled
2019-02-10 2019-03-16 35 599d 2019-02-10 0d
Unscheduled
2017-06-21 2017-06-21 1 2d - -
Scheduled
2017-04-23 2017-06-19 58 533d 2017-04-30 -7d
Scheduled
2015-10-04 2015-11-07 35 273d 2015-09-27 +7d
Unscheduled
2015-01-01 2015-01-04 4 281d - -
Unscheduled
2014-03-17 2014-03-26 10 5d - -
Scheduled
2014-02-09 2014-03-12 32 223d 2014-02-09 0d
Unscheduled
2013-06-27 2013-07-01 5 377d - -
Scheduled
2012-04-23 2012-06-15 54 530d 2012-04-22 +1d
Scheduled
2010-10-03 2010-11-10 39 377d 2010-10-04 -1d
Unscheduled
2009-09-20 2009-09-21 2 181d - -
Scheduled
2009-01-26 2009-03-23 57 530d 2009-01-26 0d
Unscheduled
2007-08-11 2007-08-15 5 75d - -
Scheduled
2007-05-01 2007-05-28 28 518d 2007-04-30 +1d
Scheduled
2005-10-24 2005-11-29 37 458d 2005-10-23 +1d
Unscheduled
2004-07-22 2004-07-23 2 49d - -
Scheduled
2004-03-23 2004-06-03 73 468d 2004-10-20 (Model) -211d (Model)
Scheduled
2002-10-21 2002-12-11 52 139d 2002-10-21 0d
Unscheduled
2002-06-04 2002-06-04 1 9d - -
Unscheduled
2002-04-29 2002-05-26 28 524d - -
Unscheduled
2000-11-21 2000-11-21 1 8d - -
Scheduled
2000-10-08 2000-11-13 37 135d 2000-10-08 0d
Unscheduled
2000-05-15 2000-05-26 12 177d - -
Unscheduled
1999-11-20 1999-11-20 1 21d - -
Unscheduled
1999-10-29 1999-10-30 2 36d - -
Unscheduled
1999-09-23 1999-09-23 1 193d - -
Scheduled
1999-02-08 1999-03-14 35 - 1999-02-08 0d
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