D.C. Cook 1

Power Ascension · 12%

Indiana Michigan Power·Bridgman, MI·PWR·1,009 MWe

Data refreshed 9.4h ago Rx Status: Oct 22, 2026 at 5:16 AM (M-F)

Outage History Daily Power Log Get alerts

Reactor Status Timeline

Power Ascension · 12% NRC data, Mon to Fri ? Actual daily reactor status from NRC reports (Mon to Fri) and the current state. What is coming -- the utility's published Scheduled outage and NukeWorker's model Projection -- is part of a subscription. Colored by status. How far ahead you can see depends on your plan.
Nov2025DecJan2026FebMarAprMayJunJulAugSepOctNovOnline: Oct 22, 2025 to Sep 16, 2026Coastdown: Sep 17, 2026 to Sep 18, 2026Refueling Outage (U1C34): Sep 19, 2026 to Oct 21, 2026U1C34Power Ascension: Oct 22, 2026Today
OnlineCoastdownPower AscensionRefueling Outage
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Composite Operational Excellence Score (0-100) — average percentile rank across 7 dimensions in three sub-scores: Reliability (capacity factor, forced outage days, B2B avg streak), Efficiency (fuel utilization, refuel duration), and Discipline (startup duration, scram count). 5-year window. Higher = more operationally excellent. Click to see the full breakdown.
   
Excellence
Rank locked · 93 units
Subscribers
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Days of continuous operation since the last outage ended (Started 2026-10-21). Has forced outage(s) since last refueling.
1
Current Run
days
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Longest recorded period of continuous operation between outages (2011-10-25 to 2013-03-27).
519
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold set for this unit with no trips to 0% power.
7
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
78.2%
Capacity Factor
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Net electricity actually generated over the most recent 12 months reported by the U.S. EIA (Form EIA-923), summed across every unit at this plant. Authoritative actuals, not an estimate.
18.51 TWh
Net Generation
EIA-923 · 12 mo to 2026-07 · plant total
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Total number of scheduled refueling outages detected in the historical data.
17
Outages
since 1999
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Average time from first power generation (>0%) to sustained full power (≥95% for 2+ days) across the last 3 scheduled outages. Click to compare against the fleet on the Operator Efficiency Leaderboard.
6.3
Avg Startup
days (last 3)
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Average fuel utilization — percent of the designed fuel cycle that this unit consumes before refueling, derived from the historical burn-down trajectory. Higher = more efficient operator (refuels with less margin remaining; closer to coastdown). Computed as 100% minus the unit's average refuel-point fuel %, using the last 3 years where available, otherwise lifetime average. Click to compare against the fleet on the Operator Efficiency Leaderboard.
98.5%
Fuel Utilization
3yr avg

Reactor Status

Current Reactor Status Oct 22, 2026

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Current power output from NRC daily reactor status reports, updated Monday through Friday, except federal holidays. The gauge shows power level as a percentage of rated capacity. The sparkline shows the last 14 days of power history. Click to view the full unit dashboard.
D.C. Cook 1 is in Power Ascension at 12% of rated power as of Oct 22, 2026. Over the last 14 reported days it has run between 0% and 12% power.
D.C. Cook 1 is in Power Ascension Get alerts
12↑
PERCENT
0 200 400 600 800 1,009 RATED CAPACITY (1,009 MWe) 121 MWe
Current:
121 MWe
Powering 96,800 homes
Rated Capacity:
1,009 MWe
807,200 homes
14-Day Power History
0
0
0
0
0
0
0
0
0
0
0
0
0
12
Oct 9 Oct 22

Capacity Factor (365-Day)

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12%
Current
90.6%
365-Day Avg
#21
of 94 plants
Min: 0% Max: 100% 36 days <80%

Outage Days by Year

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Total days spent in outage each year, split by scheduled refueling (blue) and forced/unplanned (red). Lower totals indicate better reliability and outage execution. Hover for details.
Across its recorded history, D.C. Cook 1 has spent 715 days in scheduled refueling outages and 192 days in forced or unplanned outages. Taller bars mark the years with the most downtime.
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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

D.C. Cook 1 has 33 outages plotted here, averaging 27 days each. The most recent, in Sep 2026, was a scheduled refueling outage lasting 33 days.
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Scheduled refueling outage durations over time. Green bars are at or below this unit's average, amber up to 30% above it, red beyond that. The dashed line is the average. Shorter outages mean better execution.

Refueling Duration Trend

D.C. Cook 1 has completed 17 scheduled refueling outages on record, averaging 42 days each. The most recent, in Sep 2026, ran 33 days.
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Time in days from first power generation (>0%) to sustained full power (≥95% for 2+ consecutive days) after each scheduled refueling outage. The dashed line marks the average. Includes startup testing holds and power dips.

Startup Duration Trend

After a refueling outage, D.C. Cook 1 takes about 6 days to climb from first power back to full power. That average is drawn from 16 startups on record, and the most recent took 4 days.
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Daily reactor power over the 120 days before each scheduled refueling outage, one line per refueling, lined up on the day the outage began. A coastdown is the slow decline as the fuel runs out near the end of a cycle. The highlighted line is the most recent refueling and fainter lines are older. Counts and medians cover coastdowns of a week or longer. A shutdown straight from full power, with no decline ahead of it, is what a forced outage looks like.

Coastdown Before Refueling

2 of 17 refuelings 22 days median 50% power at shutdown 2.3% per day
D.C. Cook 1 coasted down for a week or longer before 2 of its 17 refuelings on record. Those coastdowns ran a median of 22 days and ended near 50% power. The most recent refueling, in Sep 2026, began with no extended coastdown.
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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

Over its operating life, D.C. Cook 1 has run at about 78.2% of its rated capacity. Across the last 12 reported months it averaged 88.2%. On the chart, green stretches near the top are full-power running, amber marks reduced power (50 to 89%), and red drops toward zero are outages.

Outage History & Daily Power Log

This table logs every recorded outage for D.C. Cook 1, 35 in all since 1999. Of those, 17 were scheduled refueling outages and 18 were unplanned or forced. The typical outage lasted about 59 days. Where the Scheduled column shows (Model), the date is a NukeWorker projection because the utility had not published one.
Type ⇅ Actual Start ⇅ Actual End ⇅ Duration ⇅ Days Online ⇅ Scheduled Delta
Scheduled U1C34
2026-09-19 2026-10-21 33 508d 2026-09-19 0d
Scheduled U1C33
2025-03-22 2025-04-29 39 495d 2025-03-22 0d
Scheduled U1C32
2023-10-14 2023-11-13 31 405d 2023-10-14 0d
Scram # 56076 Auto
2022-08-29 2022-09-04 7 92d - -
Scram # 55910 Manual
2022-05-25 2022-05-29 5 3d - -
Scheduled U1C31
2022-04-02 2022-05-22 51 244d 2022-04-02 0d
Unscheduled
2021-07-28 2021-08-01 5 283d - -
Scheduled U1C30
2020-09-19 2020-10-18 30 499d 2020-09-22 -3d
Scheduled U1C29
2019-03-06 2019-05-09 65 464d 2019-03-06 0d
Scheduled U1C28SGR/Major
2017-09-13 2017-11-27 76 504d 2017-09-20 -7d
Scheduled U1C27
2016-03-23 2016-04-27 36 238d 2016-03-22 +1d
Unscheduled
2015-06-01 2015-07-29 59 210d - -
Scram # 50587 Manual
2014-11-01 2014-11-03 3 9d - -
Scheduled U1C26
2014-09-24 2014-10-23 30 494d 2014-09-24 0d
Scheduled U1C25
2013-03-27 2013-05-18 53 519d 2013-03-13 +14d
Scheduled U1C24
2011-09-21 2011-10-25 35 12d 2011-09-21 0d
Scram # 47247 Auto
2011-09-08 2011-09-09 2 175d - -
Unscheduled
2011-03-12 2011-03-17 6 337d - -
Scheduled U1C23
2010-03-03 2010-04-09 38 76d 2010-03-03 0d
Unscheduled Ext. Shutdown
2008-09-21 2009-12-17 453 145d - -
Scheduled U1C22
2008-03-26 2008-04-29 35 52d 2008-03-15 +11d
Unscheduled
2008-02-03 2008-02-03 1 158d - -
Unscheduled
2007-08-29 2007-08-29 1 292d - -
Scheduled U1C21
2006-09-16 2006-11-10 56 45d 2006-09-15 +1d
Unscheduled
2006-07-31 2006-08-02 3 461d - -
Scheduled U1C20
2005-03-26 2005-04-26 32 354d 2005-03-26 0d
Unscheduled
2004-03-31 2004-04-06 7 127d - -
Scheduled U1C19
2003-10-18 2003-11-25 39 144d 2003-10-18 0d
Unscheduled
2003-04-24 2003-05-27 34 79d - -
Unscheduled
2003-01-16 2003-02-04 20 213d - -
Unscheduled
2002-06-15 2002-06-17 3 7d - -
Scheduled U1C18
2002-05-04 2002-06-08 36 217d 2002-05-04 0d
Unscheduled
2001-08-28 2001-09-29 33 191d - -
Unscheduled
2001-02-16 2001-02-18 3 58d - -
Unscheduled Ext. Shutdown
1999-01-01 2000-12-20 720 - - -
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