Vogtle 4 - Status & History

Comprehensive reactor performance metrics, cycle analysis, and historical outage data. Data refreshed 8.1h ago Rx Status: May 22, 2026 at 4:51 AM (M-F)

Plant Info Outage History Daily Power Log
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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 (Started 2025-10-06). Clean run (no forced outages since last refueling).
228
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).
68.6%
Capacity Factor
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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

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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

58.8% remaining 227 / 533 days 7.6 FPD margin
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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

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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