FERC denied ISO-NE’s request for a Tariff waiver to keep Exelon’s Mystic plant running, instead ordering the RTO to allow cost-of-service agreements.

Exelon’s plans for its generation subsidiary rely heavily on a push for new legislation and market rule changes that ensure profitability for its plants.

Citing reliability concerns, ISO-NE will ask FERC for a Tariff waiver to allow Exelon's 1,998-MW Mystic Generating Station to continue running.

Exelon filed with ISO-NE to retire the Mystic generating station, but the company said it “may reconsider” the decision if the RTO can reform its markets.