Texas’ electric grid operator said Tuesday that a new regulation limiting pollution from coal-fired power plants threatens the state’s ability to “keep the lights on.”

The Electric Reliability Council of Texas, which manages the state’s deregulated power market, said it fears that some utilities will shutter coal-fired plants to comply with the rule, which significantly restricts emissions of sulfur dioxide.

“This is one of those cases where we believe it is our role to voice our concern that Texas could face a shortage of generation necessary to keep the lights on in Texas within a few years,” ERCOT president and chief executive H.B. “Trip” Doggett said after a meeting of the council’s board of directors.

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