Vogtle 4 - 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), the current state, and what is coming: the utility's published Scheduled outage plus, for subscribers, NukeWorker's model Projection. Colored by status. How far ahead you can see depends on your plan.
Aug2025SepOctNovDecJan2026FebMarAprMayJunJulAugOnline: Jul 17, 2025 to Aug 19, 2025Coastdown: Aug 20, 2025 to Sep 6, 2025Refueling Outage: Sep 7, 2025 to Oct 6, 2025Power Ascension: Oct 7, 2025 to Oct 9, 2025Online: Oct 10, 2025 to Mar 13, 2026Reduced Power: Mar 14, 2026 to Mar 23, 2026Online: Mar 24, 2026 to Jul 17, 2026Today
OnlineReduced PowerCoastdownPower AscensionRefueling Outage
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This unit hasn't completed enough refueling cycles yet to be ranked. The Operational Excellence Score will appear after the unit's second scheduled refuel.
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Excellence
Provisional
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Days of continuous operation since the last outage ended. Clean run (no forced outages since last refueling).
284
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2024-06-09 to 2025-03-24).
288
Record Run
days
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Breaker-to-Breaker runs — continuous operation exceeding the cycle-adjusted threshold (622 days for this 24-month cycle unit) with no trips to 0% power.
0
B2B Runs
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
70.2%
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.
36.87 TWh
Net Generation
EIA-923 · 12 mo to 2026-04 · plant total
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Total number of scheduled refueling outages detected in the historical data.
1
Outages
since 2023
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Average time from first power generation (>0%) to sustained full power (≥95% for 2+ days) across the last 1 scheduled outage. Click to compare against the fleet on the Operator Efficiency Leaderboard.
3
Avg Startup
days (last 1)
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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

Vogtle 4 has 6 outages plotted here, averaging 10 days each. The most recent, in Sep 2025, was a scheduled refueling outage lasting 30 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 Oct 7, 2025

48.5% remaining 282 / 533 days 7.6 FPD margin
Vogtle 4 is 282 days into its current fuel cycle with an estimated 48.5% of its fuel left. This cycle is set up to run about 533 days.
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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, Vogtle 4 has run at about 70.2% of its rated capacity. Across the last 12 reported months it averaged 88.9%. 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 Vogtle 4, 7 in all since 2023. Of those, 1 was scheduled refueling outage and 6 were unplanned or forced. The typical outage lasted about 35 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
2025-09-07 2025-10-06 30 156d 2025-09-07 0d
Unscheduled
2025-03-24 2025-04-04 12 288d - -
Scram # 57164
2024-06-06 2024-06-09 4 45d - -
Unscheduled
2024-04-13 2024-04-22 10 5d - -
Unscheduled
2024-04-08 2024-04-08 1 30d - -
Unscheduled
2024-03-06 2024-03-09 4 13d - -
Unscheduled
2023-08-21 2024-02-22 186 - - -
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