Diablo Canyon 2

Online · 100% power

Pacific Gas & Electric·Avila Beach, CA·PWR·1,118 MWe

Data refreshed 54 min ago Rx Status: Oct 19, 2026 at 5:12 AM (M-F)

Outage History Daily Power Log Get alerts

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.
Nov2025DecJan2026FebMarAprMayJunJulAugSepOctNovRefueling Outage: Oct 19, 2025 to Nov 4, 2025Power Ascension: Nov 5, 2025 to Nov 7, 2025Online: Nov 8, 2025 to Sep 11, 2026Reduced Power: Sep 12, 2026 to Sep 13, 2026Online: Sep 14, 2026 to Sep 18, 2026Reduced Power: Sep 19, 2026 to Sep 20, 2026Online: Sep 21, 2026 to Oct 19, 2026Today
OnlineReduced PowerPower 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 2025-11-04). Clean run (no forced outages since last refueling).
349
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2016-06-01 to 2018-02-11).
620
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.
6
B2B Runs
77% toward B2B (345/449d)
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
88.7%
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.
18.29 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.
4.3
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.
97.5%
Fuel Utilization
3yr avg

Reactor Status

Current Reactor Status Oct 19, 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.
Diablo Canyon 2 is Online at 100% of rated power as of Oct 19, 2026. Over the last 14 reported days it has run between 100% and 100% power.
Diablo Canyon 2 is Online Get alerts
100
PERCENT
0 200 400 600 800 1000 1,118 RATED CAPACITY (1,118 MWe) 1,118 MWe
Current:
1,118 MWe
Powering 894,400 homes
Rated Capacity:
1,118 MWe
894,400 homes
14-Day Power History
Oct 6 Oct 19
Building toward B2B — 77%
345 of 449 days (no trips to 0% power)

Capacity Factor (365-Day)

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100%
Current
94.4%
365-Day Avg
#48
of 94 plants
Min: 0% Max: 100% 23 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, Diablo Canyon 2 has spent 753 days in scheduled refueling outages and 208 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

Diablo Canyon 2 has 43 outages plotted here, averaging 22 days each. The most recent, in Oct 2025, was a scheduled refueling outage lasting 31 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

Diablo Canyon 2 has completed 17 scheduled refueling outages on record, averaging 44 days each. The most recent, in Oct 2025, ran 31 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, Diablo Canyon 2 takes about 6 days to climb from first power back to full power. That average is drawn from 17 startups on record, and the most recent took 3 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

3 of 17 refuelings 11 days median 81% power at shutdown 0.6% per day
Diablo Canyon 2 coasted down for a week or longer before 3 of its 17 refuelings on record. Those coastdowns ran a median of 11 days and ended near 81% power. The most recent refueling, in Oct 2025, began with no extended coastdown.
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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 Nov 5, 2025

31.4% remaining 2.5 FPD margin
Diablo Canyon 2 has an estimated 31.4% of its fuel left. Across its last 16 cycles, it has refueled with an average of 3.2% remaining.
Avg refuel: 3.2% Avg refuel (3yr): 2.5% Deepest burn: 0.0% (1999-10 → 2001-04) Most margin: 39.3% (2019-12 → 2021-02)
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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, Diablo Canyon 2 has run at about 88.7% of its rated capacity. Across the last 12 reported months it averaged 97.9%. 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.
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Estimated reactivity remaining in Diablo Canyon 2's current fuel cycle, shown as a stylized fuel rod that drains as the cycle progresses. The cycle starts when the unit returns to power after its most recent refueling outage, and the gauge represents the fraction of that cycle's typical effective full-power days (EFPD) still available. Days at less than 100% power burn fuel proportionally — so a unit with significant downtime (high burn deficit) drains slower and ends with MORE reactivity left, giving operators margin to coast down (extend the cycle by reducing power) instead of refueling on the calendar. The dashed red line near the bottom marks the rough industry coastdown threshold (~15% remaining). Cycle target is the unit's median recent cycle length. Source: NRC daily reactor status reports cross-referenced against scheduled refuel outage history.

Fuel Burn Down Cycle since Nov 5, 2025

Diablo Canyon 2 is 347 days into its current fuel cycle with an estimated 31.4% of its fuel left. Its typical cycle runs about 502 days.
Fresh — 100%
25% 50% 75% COASTDOWN ~1% DAY 0 DAY 502
Refuel — 0%
31.4% remaining
Mid-cycle
Cycle progress
347 / 502 days
EFPD remaining
158 days
Effective burn
344 EFPD
Burn deficit
2.5 FPD
Diablo Canyon 2 is mid-cycle with healthy reactivity. Operators have flexibility to defer or advance the next refuel as needed.

Outage History & Daily Power Log

This table logs every recorded outage for Diablo Canyon 2, 43 in all since 1999. Of those, 17 were scheduled refueling outages and 26 were unplanned or forced. The typical outage lasted about 22 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 2R25
2025-10-05 2025-11-04 31 504d 2025-10-05 0d
Scheduled 2R24
2024-04-07 2024-05-19 43 500d 2024-04-06 +1d
Scheduled 2R23
2022-10-16 2022-11-24 40 348d 2022-10-16 0d
Unscheduled
2021-10-26 2021-11-02 8 3d - -
Scram # 55526 Manual
2021-10-16 2021-10-23 8 174d - -
Unscheduled
2021-04-20 2021-04-25 6 5d - -
Scheduled 2R22
2021-02-04 2021-04-15 71 25d 2021-02-04 0d
Unscheduled
2020-12-03 2021-01-10 39 8d - -
Unscheduled
2020-10-16 2020-11-25 41 76d - -
Scram # 54789 Manual
2020-07-18 2020-08-01 15 153d - -
Unscheduled
2020-02-14 2020-02-16 3 64d - -
Scheduled 2R21SGR/Major
2019-09-22 2019-12-12 82 294d 2019-09-22 0d
Scram # 53764 Auto
2018-12-02 2018-12-02 1 256d - -
Scheduled 2R20
2018-02-11 2018-03-21 39 620d 2018-02-04 +7d
Scheduled 2R19
2016-05-01 2016-06-01 32 542d 2016-05-01 0d
Scheduled 2R18
2014-10-05 2014-11-06 33 49d 2014-09-28 +7d
Unscheduled
2014-08-15 2014-08-17 3 189d - -
Scram # 49786 Auto
2014-02-03 2014-02-07 5 205d - -
Scram # 49184 Auto
2013-07-11 2013-07-13 3 111d - -
Scheduled 2R17
2013-02-03 2013-03-22 48 111d 2013-02-03 0d
Scram # 48400 Auto
2012-10-12 2012-10-15 4 167d - -
Unscheduled
2012-04-26 2012-04-28 3 326d - -
Scheduled 2R16
2011-05-01 2011-06-05 36 31d 2011-05-02 -1d
Scram # 46701 Manual
2011-03-27 2011-03-31 5 502d - -
Scheduled 2R15
2009-10-04 2009-11-10 38 43d 2009-10-04 0d
Unscheduled
2009-08-14 2009-08-22 9 43d - -
Unscheduled
2009-07-01 2009-07-02 2 251d - -
Unscheduled
2008-10-22 2008-10-23 2 47d - -
Unscheduled
2008-08-17 2008-09-05 20 128d - -
Scheduled 2R14
2008-02-04 2008-04-11 68 417d 2008-02-04 0d
Unscheduled
2006-12-11 2006-12-14 4 201d - -
Scheduled 2R13
2006-04-18 2006-05-24 37 494d 2006-04-17 +1d
Scheduled 2R12
2004-10-26 2004-12-10 46 560d 2004-10-25 +1d
Unscheduled
2003-04-05 2003-04-15 11 7d - -
Unscheduled
2003-03-29 2003-03-29 1 5d - -
Scheduled 2R11
2003-02-04 2003-03-24 49 86d 2003-02-04 0d
Unscheduled
2002-11-09 2002-11-10 2 272d - -
Unscheduled
2002-02-10 2002-02-10 1 260d - -
Scheduled 2R10
2001-04-29 2001-05-26 28 227d 2001-04-29 0d
Unscheduled
2000-09-06 2000-09-14 9 291d - -
Unscheduled
1999-11-20 1999-11-20 1 21d - -
Unscheduled
1999-10-29 1999-10-30 2 2d - -
Scheduled 2R9
1999-09-26 1999-10-27 32 - 1999-09-26 0d
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