PJM is concerned that EPA was overly optimistic in its assumptions for how quickly it can add transmission to meet the Clean Power Plan.

EPA's final Clean Power Plan provoked outrage from coal interests, praise from environmentalists and cautious optimism from regulators and grid operators.

EPA's final Clean Power Plan relaxes some controversial proposals while increasing its target for carbon emission reductions.

The Supreme Court ruled that EPA acted “unreasonably” when it failed to consider costs before deciding to regulate mercury and other toxic emissions from power plants under the Clean Air Act.

With its reliance on demand response and behind-the-meter generation increasing amid generator retirements, MISO plans to update the way it sets prices during emergency resource offers.

FERC said it expects sufficient resources to meet peak electric demand this summer despite coal-fired retirements, while NERC approved its summer reliability assessment.

Since the EPA proposed its Clean Power Plan, the idea that the final rule should include a reliability safety valve has become an article of faith among utility, state and RTO officials.

Grand River Dam Authority (GRDA); operators of an Oklahoma coal-fired generator seeking a temporary reprieve from EPA's MATS rule won an assist from FERC.

The Mercury and Air Toxics Standards at issue before the Supreme Court are the result of a quarter century of legislation, regulation and litigation.

AEP and FirstEnergy's plans to shut down coal-fired generation under the EPA’s MATS won't change even if the Supreme Court throws out the standards.