Vogtle 4

Online · 100% power

Southern Nuclear·Waynesboro, GA·AP1000·1,117 MWe

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.
Nov2025DecJan2026FebMarAprMayJunJulAugSepOctNovOnline: Oct 22, 2025 to Mar 13, 2026Reduced Power: Mar 14, 2026 to Mar 23, 2026Online: Mar 24, 2026 to Aug 31, 2026Reduced Power: Sep 1, 2026 to Sep 2, 2026Online: Sep 3, 2026 to Oct 22, 2026Today
OnlineReduced Power
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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).
381
Current Run
days ✔
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Longest recorded period of continuous operation between outages (2025-10-06 to Present).
381
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.
0
B2B Runs
82% toward B2B (379/460d)
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Lifetime capacity factor: average power level across all recorded days (100% = always at full power).
72.7%
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.
37.03 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.
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)

Reactor Status

Current Reactor Status Oct 22, 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.
Vogtle 4 is Online at 100% of rated power as of Oct 22, 2026. Over the last 14 reported days it has run between 100% and 100% power.
Vogtle 4 is Online Get alerts
100
PERCENT
0 200 400 600 800 1000 1,117 RATED CAPACITY (1,117 MWe) 1,117 MWe
Current:
1,117 MWe
Powering 893,600 homes
Rated Capacity:
1,117 MWe
893,600 homes
14-Day Power History
Oct 9 Oct 22
Building toward B2B — 82%
379 of 460 days (no trips to 0% power)

Capacity Factor (365-Day)

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100%
Current
98%
365-Day Avg
#75
of 94 plants
Min: 30% Max: 100% 11 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, Vogtle 4 has spent 30 days in scheduled refueling outages and 31 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

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

30.3% remaining 8.2 FPD margin
Vogtle 4 has an estimated 30.3% of its fuel left.
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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 72.7% of its rated capacity. Across the last 12 reported months it averaged 98.0%. 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 Vogtle 4'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 Oct 7, 2025

Vogtle 4 is 380 days into its current fuel cycle with an estimated 30.2% of its fuel left. Its typical cycle runs about 533 days.
Fresh — 100%
25% 50% 75% COASTDOWN ~15% DAY 0 DAY 533
Refuel — 0%
30.2% remaining
Mid-cycle
Cycle progress
380 / 533 days
EFPD remaining
161 days
Effective burn
372 EFPD
Burn deficit
8.2 FPD
Vogtle 4 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 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 4R01
2025-09-07 2025-10-06 30 156d 2025-09-07 0d
Unscheduled
2025-03-24 2025-04-04 12 288d - -
Scram # 57164 Manual
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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