Ginna - Status & History

Comprehensive reactor performance metrics, cycle analysis, and historical outage data.
Data refreshed 10.7h ago Rx Status: Sep 11, 2026 at 5:21 AM (M-F)

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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.
Oct2025NovDecJan2026FebMarAprMayJunJulAugSepOnline: Sep 11, 2025 to Mar 11, 2026Coastdown: Mar 12, 2026 to Apr 5, 2026Refueling Outage (G1R46): Apr 6, 2026 to Apr 23, 2026G1R46Power Ascension: Apr 24, 2026 to Apr 26, 2026Online: Apr 27, 2026 to Sep 11, 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
ranked of 93
Subscribers
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Days of continuous operation since the last outage ended (Started 2026-04-23). Clean run (no forced outages since last refueling).
141
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2005-04-10 to 2006-10-09).
547
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.
9
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
93.6%
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). Authoritative actuals, not an estimate.
4.71 TWh
Net Generation
EIA-923 · 12 mo to 2026-06
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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.
2.7
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.
98.1%
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: 80/100 (#8/93)2022: 83/100 (#9/92)2023: 67/100 (#23/92)2024: 67/100 (#18/92)2025: 70/100 (#22/92)2026: 71/100 (#22/93) Stable vs 2025
Compare Ginna 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

Ginna has 36 outages plotted here, averaging 15 days each. The most recent, in Apr 2026, was a scheduled refueling outage lasting 18 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, Ginna takes about 5 days to climb from first power back to full power. That average is drawn from 19 startups on record, and the most recent took 3 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 Apr 24, 2026

73.8% remaining 0.6 FPD margin
Ginna has an estimated 73.8% of its fuel left. Across its last 18 cycles, it has refueled with an average of 3.7% remaining.
Avg refuel: 3.7% Avg refuel (3yr): 1.9% Deepest burn: 0.0% (2005-04 → 2006-10) Most margin: 9.5% (2008-05 → 2009-09)
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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, Ginna has run at about 93.6% of its rated capacity. Across the last 12 reported months it averaged 93.9%. 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 Ginna, 36 in all since 1999. Of those, 19 were scheduled refueling outages and 17 were unplanned or forced. The typical outage lasted about 15 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 G1R46
2026-04-06 2026-04-23 18 538d 2026-04-06 0d
Scheduled G1R45
2024-09-30 2024-10-15 16 352d 2024-09-30 0d
Scram # 56790
2023-10-13 2023-10-14 2 32d - -
Scram # 56731
2023-09-10 2023-09-11 2 133d - -
Scheduled G1R44
2023-04-10 2023-04-30 21 535d 2023-04-09 +1d
Scheduled G1R43
2021-10-04 2021-10-22 19 499d 2021-10-18 -14d
Scheduled G1R42
2020-04-06 2020-05-23 48 294d 2020-04-06 0d
Unscheduled
2019-06-17 2019-06-17 1 221d - -
Scheduled G1R41
2018-10-22 2018-11-08 18 226d 2018-10-22 0d
Unscheduled
2018-03-09 2018-03-10 2 299d - -
Scheduled G1R40
2017-04-24 2017-05-14 21 535d 2017-04-24 0d
Scheduled G1R39
2015-10-19 2015-11-06 19 512d 2015-10-19 0d
Unscheduled Startup Hold
2014-05-25 2014-05-25 1 5d - -
Scheduled G1R38
2014-04-28 2014-05-20 23 275d 2014-04-27 +1d
Scram # 49214
2013-07-25 2013-07-27 3 247d - -
Unscheduled Startup Hold
2012-11-20 2012-11-20 1 2d - -
Scheduled G1R37
2012-10-22 2012-11-18 28 373d 2012-10-20 +2d
Scram # 47338
2011-10-12 2011-10-15 4 125d - -
Scheduled G1R36
2011-04-24 2011-06-09 47 475d 2011-04-25 -1d
Unscheduled
2009-12-31 2010-01-04 5 90d - -
Scheduled G1R35
2009-09-14 2009-10-02 19 491d 2009-09-13 +1d
Scheduled G1R34
2008-04-21 2008-05-11 21 400d 2008-04-13 +8d
Unscheduled
2007-03-17 2007-03-18 2 48d - -
Unscheduled
2007-01-28 2007-01-28 1 87d - -
Scheduled G1R33
2006-10-09 2006-11-02 25 547d 2006-10-08 +1d
Scheduled G1R32
2005-03-21 2005-04-10 21 31d 2005-03-20 +1d
Unscheduled
2005-02-17 2005-02-18 2 123d - -
Unscheduled
2004-10-16 2004-10-17 2 368d - -
Scheduled G1R31
2003-09-16 2003-10-14 29 30d 2003-09-16 0d
Unscheduled
2003-08-15 2003-08-17 3 484d - -
Scheduled G1R30
2002-03-19 2002-04-18 31 41d 2002-03-19 0d
Unscheduled
2002-02-06 2002-02-06 1 472d - -
Unscheduled
2000-10-22 2000-10-22 1 4d - -
Scheduled G1R29
2000-09-19 2000-10-18 30 509d 2000-09-19 0d
Unscheduled
1999-04-28 1999-04-29 2 7d - -
Scheduled G1R28
1999-03-02 1999-04-21 51 - 1999-03-02 0d
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