Ginna completes Spring refuel in 18 days, caps 537-day B2B run

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The Ginna refueling outage finished 3 days ahead of the 21-day schedule. This 18-day duration is 9.1 days below the average of the unit's 18 prior refuels. The unit entered this outage with a 2485-day streak free of unscheduled outages.

18 days outage · 3 days ahead of schedule · ninth B2B run complete · 581 MW back online

Ginna completed its Spring 2026 refueling outage on Apr 23, 2026, returning to service after 18 days. The outage began on Apr 6, 2026.

The published schedule had it at 21 days (Apr 6, 2026 to Apr 27, 2026), so the actual ran 3 days shorter than planned.

It is the unit's third-shortest refueling outage of 19 cycles tracked since 1999. It also capped a 537-day breaker-to-breaker run (over the 463-day threshold for an 18-month cycle), the unit's ninth qualified B2B run. Going into the refueling, the unit had run for more than 6 years without an unscheduled outage. NukeWorker's predictive model scores 95% on duration accuracy for this unit.

The 18-day outage removed roughly 231,000 MWh from the grid, worth approximately $9 million at recent wholesale prices, equivalent to a year's electricity for about 21,000 homes.

Across the U.S. fleet of 94 commercial reactors, today's combined capacity factor is 91.3% (5 currently in refueling), above the 87.0% baseline for this month over the past five years. Quad Cities 2, South Texas 1, and McGuire 2 also completed refueling outages within the past week.

Ginna is a 581-MW Westinghouse 2-loop PWR operated by Constellation Nuclear (commercial operation since 1970). At full power, it supplies enough electricity for roughly 465,000 homes. The utility operates 20 other U.S. nuclear units. Its operating license runs through 2029 (renewed in 2004). The unit ran at a 100.0% capacity factor in 2025, among the unit's strongest cycles.

View Ginna's ratings, history, predictions, and current status on NukeWorker.

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Sources: NRC Daily Reactor Power Status reports, utility-published outage schedules, and NukeWorker's predictive model.