Palo Verde 2 - Status & History

Comprehensive reactor performance metrics, cycle analysis, and historical outage data.

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Reactor Status Timeline

Online 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.
Oct2025NovDecJan2026FebMarAprMayJunJulAugSepOctOnline: Sep 18, 2025 to Mar 17, 2026Coastdown: Mar 18, 2026 to Mar 19, 2026Refueling Outage (trip-initiated, 2R26): Mar 20, 2026 to May 4, 20262R26Power Ascension: May 5, 2026 to May 14, 2026Online: May 15, 2026Power Ascension: May 16, 2026Online: May 17, 2026 to Sep 18, 2026Scram (reactor trip): Mar 19, 2026Today
OnlineCoastdownPower AscensionRefueling OutageScram⚡Scram (reactor trip)
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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
ranked of 93
Subscribers
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Days of continuous operation since the last outage ended. Clean run (no forced outages since last refueling).
137
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2011-05-05 to 2012-10-06).
520
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.
5
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
89.1%
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.
31.19 TWh
Net Generation
EIA-923 · 12 mo to 2026-06 · plant total
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Total number of scheduled refueling outages detected in the historical data.
19
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.
7
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.
96.6%
Fuel Utilization
3yr avg
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NukeWorker's Operational Excellence Score is a composite 0–100 ranking of every active US nuclear unit across 7 measured performance metrics, grouped into three sub-scores:
• Reliability — capacity factor, forced outage days, B2B avg streak
• Efficiency — fuel utilization, refuel duration
• Discipline — startup duration, scram count
Each unit's metric is converted to a percentile across the active fleet. Sub-score = average of its components; composite = average of the three sub-scores. Use the time-window toggle below to switch between 3yr / 5yr / lifetime.
Time window — change how far back we look
5-yr trend: 2021: 29/100 (#74/93)2022: 27/100 (#78/92)2023: 26/100 (#82/92)2024: 28/100 (#81/92)2025: 38/100 (#66/92)2026: 34/100 (#72/93) ↓ -3.7 pts vs 2025
Compare Palo Verde 2 head-to-head with up to 3 other units. Compare now
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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

Palo Verde 2 has 48 outages plotted here, averaging 20 days each. The most recent, in Mar 2026, was a scheduled refueling outage lasting 46 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, Palo Verde 2 takes about 6 days to climb from first power back to full power. That average is drawn from 18 startups on record, and the most recent took 12 days.
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Estimated fuel remaining in the current cycle, expressed as a percentage of the unit's typical cycle. Starts at 100% when the unit returns to power post-refuel and drops as full-power-days are burned. Days at reduced power burn fuel proportionally — so a unit with significant downtime (high burn deficit) drops slower and ends up with MORE fuel left than its calendar position would suggest. Coastdown threshold around 15%. Toggle to overlay past cycles on a normalized "days into cycle" axis to see how aggressively this unit historically burns down before refuel.

Fuel Burn Down Cycle since May 7, 2026

74.1% remaining 1.0 FPD margin
Palo Verde 2 has an estimated 74.1% of its fuel left. Across its last 18 cycles, it has refueled with an average of 4.3% remaining.
Avg refuel: 4.3% Avg refuel (3yr): 3.4% Deepest burn: 0.0% (2002-04 → 2003-09) Most margin: 13.7% (2003-10 → 2005-04)
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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, Palo Verde 2 has run at about 89.1% of its rated capacity. Across the last 12 reported months it averaged 86.4%. On the chart, flat stretches near the top are full-power running and drops to zero are outages.
This table logs every recorded outage for Palo Verde 2, 48 in all since 1999. Of those, 19 were scheduled refueling outages and 29 were unplanned or forced. The typical outage lasted about 20 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 # 58211 2R26
2026-03-20 2026-05-04 46 494d 2026-03-28 -8d
Scheduled 2R25
2024-10-05 2024-11-11 38 490d 2024-10-05 0d
Scram # 56551
2023-06-03 2023-06-03 1 6d - -
Unscheduled
2023-05-23 2023-05-28 6 12d - -
Scheduled 2R24
2023-04-08 2023-05-11 34 426d 2023-04-08 0d
Unscheduled
2022-01-25 2022-02-06 13 76d - -
Scheduled 2R23
2021-10-09 2021-11-10 33 141d 2021-10-02 +7d
Scram # 55265
2021-05-20 2021-05-21 2 81d - -
Scram # 55114
2021-02-27 2021-02-28 2 299d - -
Scheduled 2R22
2020-04-04 2020-05-04 31 28d 2020-04-04 0d
Scram # 54560
2020-03-04 2020-03-07 4 198d - -
Scram # 54224
2019-08-17 2019-08-19 3 258d - -
Scheduled 2R21
2018-10-06 2018-12-02 58 134d 2018-10-06 0d
Scram # 53424
2018-05-24 2018-05-25 2 381d - -
Scheduled 2R20
2017-04-08 2017-05-08 31 511d 2017-04-08 0d
Scheduled 2R19
2015-10-10 2015-11-14 36 332d 2015-10-10 0d
Unscheduled
2014-11-07 2014-11-12 6 188d - -
Scheduled 2R18
2014-04-05 2014-05-03 29 113d 2014-03-29 +7d
Scram # 49600
2013-12-03 2013-12-13 11 391d - -
Scheduled 2R17
2012-10-06 2012-11-07 33 520d 2012-10-06 0d
Scheduled 2R16
2011-04-02 2011-05-05 34 487d 2011-04-02 0d
Scheduled 2R15
2009-10-03 2009-12-01 60 293d 2009-10-03 0d
Unscheduled
2008-11-22 2008-12-14 23 171d - -
Unscheduled
2008-06-02 2008-06-04 3 3d - -
Scheduled 2R14
2008-03-29 2008-05-30 63 169d 2008-03-29 0d
Unscheduled
2007-10-07 2007-10-12 6 224d - -
Unscheduled
2007-02-20 2007-02-25 6 99d - -
Scheduled 2R13
2006-09-30 2006-11-13 45 65d 2006-09-29 +1d
Unscheduled
2006-07-27 2006-07-27 1 106d - -
Unscheduled
2006-04-11 2006-04-12 2 173d - -
Unscheduled
2005-10-12 2005-10-20 9 48d - -
Unscheduled
2005-08-23 2005-08-25 3 96d - -
Scheduled 2R12
2005-04-02 2005-05-19 48 260d 2005-04-01 +1d
Unscheduled
2004-07-15 2004-07-16 2 27d - -
Unscheduled
2004-06-15 2004-06-18 4 99d - -
Unscheduled
2004-02-20 2004-03-08 18 70d - -
Unscheduled
2003-10-20 2003-12-12 54 2d - -
Scheduled 2R11
2003-09-27 2003-10-18 22 58d 2003-10-20 -23d
Unscheduled
2003-07-30 2003-07-31 2 470d - -
Scheduled 2R10
2002-03-16 2002-04-16 32 128d 2002-03-16 0d
Unscheduled
2001-10-11 2001-11-08 29 89d - -
Unscheduled
2001-07-14 2001-07-14 1 237d - -
Unscheduled
2000-11-19 2000-11-19 1 14d - -
Scheduled 2R9
2000-10-04 2000-11-05 33 37d 2000-10-04 0d
Unscheduled
2000-08-27 2000-08-28 2 228d - -
Unscheduled
2000-01-06 2000-01-12 7 201d - -
Unscheduled
1999-06-19 1999-06-19 1 50d - -
Scheduled 2R8
1999-03-27 1999-04-30 35 - 1999-03-27 0d
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