Exelon News Release

EXELON DEFERS DECISIONS ON ITS QUAD CITIES AND BYRON NUCLEAR PLANTS FOR ONE YEAR

Deferral follows outcome of third PJM capacity auction

CHICAGO (Sept. 10, 2015) — Exelon Corporation (NYSE: EXC) today announced that all of its nuclear plants in the PJM market cleared in the transition capacity auction for the 2017-18 planning year and that the company will defer any decisions about the future operations of its Quad Cities and Byron nuclear plants for one year. As a result, the company plans to continue operating its Quad Cities nuclear power plant through at least May 2018. The Byron plant is already obligated to operate through May 2019.

Exelon intends to bid Quad Cities, Byron, Three Mile Island and all eligible nuclear plants into the 2019-2020 PJM capacity auction next year. The decision to defer retirement decisions comes after rigorous analysis of the present and future economics of the plants, taking into consideration the constructive market trends stemming from the PJM capacity auction reforms.

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