Prairie Island 1

Refueling Outage · Day 16

Xcel Energy·Welch, MN·PWR·521 MWe

Data refreshed 14.4h ago Rx Status: Oct 16, 2026 at 9:02 AM (M-F)

Outage History Daily Power Log Get alerts

Reactor Status Timeline

Refueling Outage · Day 16 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 18, 2025 to May 2, 2026Reduced Power: May 3, 2026Online: May 4, 2026 to May 17, 2026Reduced Power: May 18, 2026 to May 21, 2026Online: May 22, 2026 to Jul 17, 2026Reduced Power: Jul 18, 2026 to Jul 19, 2026Online: Jul 20, 2026 to Oct 2, 2026Refueling Outage (1R35): Oct 3, 2026 to Oct 18, 20261R35Today
OnlineReduced PowerRefueling 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 2026-10-16). Has forced outage(s) since last refueling.
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Current Run
offline
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Longest recorded period of continuous operation between outages (2020-10-13 to 2022-10-15).
732
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.
3
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
88.6%
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.
8.84 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.
16
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.
3.3
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.
89.2%
Fuel Utilization
3yr avg

Reactor Status

Current Reactor Status Oct 16, 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.
Prairie Island 1 is OFFLINE (14 Days) at 0% of rated power as of Oct 16, 2026. This outage is RFO 1R35. Over the last 14 reported days it has run between 0% and 0% power.
Prairie Island 1 is OFFLINE (14 Days) Get alerts
0
PERCENT
0 100 200 300 400 500 521 RATED CAPACITY (521 MWe) 0 MWe
Current:
0 MWe
Powering 0 homes
Rated Capacity:
521 MWe
416,800 homes
Report Age: 2 days ago
14-Day Power History
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Oct 3 Oct 16

Capacity Factor (365-Day)

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0%
Current
95.1%
365-Day Avg
#54
of 94 plants
Min: 0% Max: 100% 20 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, Prairie Island 1 has spent 728 days in scheduled refueling outages and 262 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

Prairie Island 1 has 38 outages plotted here, averaging 26 days each. The most recent, in Oct 2026, was a scheduled refueling outage lasting 14 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

Prairie Island 1 has completed 16 scheduled refueling outages on record, averaging 46 days each. The most recent, in Oct 2026, ran 14 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, Prairie Island 1 takes about 4 days to climb from first power back to full power. That average is drawn from 15 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

7 of 16 refuelings 21 days median 83% power at shutdown 0.9% per day
Prairie Island 1 coasted down for a week or longer before 7 of its 16 refuelings on record. Those coastdowns ran a median of 21 days and ended near 83% power. The most recent refueling, in Oct 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, Prairie Island 1 has run at about 88.6% of its rated capacity. Across the last 12 reported months it averaged 91.6%. 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 Prairie Island 1, 38 in all since 1999. Of those, 16 were scheduled refueling outages and 22 were unplanned or forced. The typical outage lasted about 26 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 1R35
2026-10-03 In Outage 14+ 438d 2026-10-02 +1d
Scram # 57813 Auto
2025-07-17 2025-07-22 6 182d - -
Scheduled 1R34SGR/Major
2024-09-21 2025-01-16 118 223d 2024-09-15 +6d
Unscheduled
2024-02-09 2024-02-11 3 16d - -
Scram # 56803 Auto
2023-10-20 2024-01-24 97 345d - -
Scheduled 1R33
2022-10-15 2022-11-09 26 732d 2022-10-14 +1d
Scheduled 1R32
2020-09-19 2020-10-13 25 20d 2020-09-18 +1d
Scram # 54859 Auto
2020-08-27 2020-08-30 4 672d - -
Scheduled 1R31
2018-09-22 2018-10-25 34 671d 2018-09-21 +1d
Scheduled 1R30
2016-10-16 2016-11-20 36 502d 2016-10-14 +2d
Scram # 51107 Manual
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 1R29
2014-10-08 2014-11-21 45 645d 2014-10-08 0d
Scheduled 1R28
2012-10-23 2013-01-01 71 66d 2012-10-27 -4d
Unscheduled
2012-08-15 2012-08-18 4 410d - -
Scram # 47017 Manual
2011-07-02 2011-07-02 1 22d - -
Scheduled 1R27
2011-04-30 2011-06-10 42 525d 2011-04-30 0d
Scheduled 1R26
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 1R25
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 1R24
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 1R23
2004-09-11 2004-11-22 73 515d 2004-09-10 +1d
Unscheduled
2003-04-15 2003-04-15 1 131d - -
Scheduled 1R22
2002-11-16 2002-12-05 20 432d 2002-11-16 0d
Unscheduled
2001-08-02 2001-09-10 40 158d - -
Scheduled 1R21
2001-01-20 2001-02-25 37 38d 2001-01-20 0d
Unscheduled
2000-12-02 2000-12-13 12 556d - -
Scheduled 1R20
1999-04-17 1999-05-26 40 96d 1999-04-17 0d
Unscheduled
1999-01-06 1999-01-11 6 - - -
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