Constellation Energy Corporatio

Filing receipts

“Interest expense, net increased by $107 million for the three months ended March 31, 2026 compared to the same period in 2025, primarily due to a net increase in outstanding debt as a result of the debt assumed and related financing transactions following the acquisition of Calpine in January 2026.”

“2025 Increase (Decrease) Labor, contracting, and materials (a) $ 175 Calpine merger and integration costs 126 Nuclear refueling outage costs (b) 51 Decommissioning-related activities (272) Other 155 Total increase $ 235 __________ (a) Primarily reflects increased employee-related costs, including labor and other incentives, as well as higher contracting expense, driven in large part by the addition of Calpine's operations beginning in January 2026. (b) Includes the co-owned Salem and STP generating units Depreciation and amortization expense increased by $195 million for the three months ended March 31, 2026 compared to the same period in 2025, primarily due to the additional depreciation a...”

“For the three months ended March 31, 2026 compared to 2025, changes in Purchased power and fuel expense by segment were approximately as follows: Three Months Ended March 31 $ Change % Change Description Mid-Atlantic $ 179 20.9 % • unfavorable $350 associated with purchased power to supply load, net of generation, primarily due to higher energy prices, higher prices associated with net capacity costs, and higher costs related to a significant weather event in January 2026;”