Susquehanna 1 completes Spring refueling outage in 43 days

[Outage Wire]

43 days outage · 3 days ahead of schedule · 1,247 MW back online

Susquehanna 1 resumed power production on May 4, 2026 after a 43-day Spring 2026 refueling outage that began Mar 23, 2026.

The published schedule had it at 46 days (Mar 23, 2026 to May 8, 2026), so the actual ran 3 days shorter than planned.

NukeWorker's predictive model scores 86% on duration accuracy for this unit.

The 43-day outage removed roughly 1.18 million MWh from the grid, worth approximately $47 million at recent wholesale prices, equivalent to a year's electricity for about 110,000 homes.

Across the U.S. fleet of 94 commercial reactors, today's combined capacity factor is 85.6% (9 currently in refueling, 2 in unscheduled outages), below the 87.0% baseline for this month over the past five years. At the same site, Susquehanna 2 is running at full power. Palo Verde 2, Beaver Valley 2, Seabrook 1, and Salem 2 also completed refueling outages within the past week.

Susquehanna 1 is a 1,247-MW General Electric BWR/4 operated by TalenEnergy Susquehanna (commercial operation since 1983). At full power, it supplies enough electricity for roughly 998,000 homes. The utility operates 1 other U.S. nuclear unit. Its operating license runs through 2042 (renewed in 2009). The unit ran at a 96.7% capacity factor in 2025, among the unit's strongest cycles.

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