Exelon Corp. (NYSE: EXC) formally notified the U.S. Nuclear Regulatory Commission (NRC) of its plans to permanently shut down the Clinton and Quad Cities nuclear plants in Illinois.

Exelon told regulators the company plans to close Clinton on June 1, 2017 and Quad Cities on June 1, 2018. The notification is the first of several procedural ones the utility will make in the coming months to regulators, grid operators and state agencies. Exelon earlier this month announced plans to retire the three reactors after state lawmakers shelved a bill intended to give funding and support to at-risk nuclear plants in the state.

“We worked for more than two years to find a solution, but now it is time to take the necessary steps to retire the plants,” said Chris Crane, Exelon president and CEO. “We are committed to working with all stakeholders to ensure the plants are shut down in a responsible, safe and transparent way.”

Quad Cities and Clinton have lost a combined $800 million in the past seven years despite being two of Exelon’s best-performing plants. Nearly 700 workers are employed at Clinton and 800 workers at Quad Cities.

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