The Pennsylvania Supreme Court dismissed a consolidated set of appeals challenging state environmental regulations on January 6, 2026, ending a multi-year legal battle between major energy companies and the Pennsylvania Department of Environmental Protection. The high court's dismissal as moot concluded four related cases that had pitted energy companies and labor unions against state environmental regulators.

The appeals stemmed from Commonwealth Court orders dated June 28, 2022, and November 1, 2023, in four separate cases numbered 113 MAP 2023, 114 MAP 2023, 115 MAP 2023, and 116 MAP 2023. The primary appellants included Constellation Energy Corporation and Constellation Energy Generation, LLC, along with a coalition of coal-related entities including Bowfin KeyCon Holdings, LLC, Chief Power Finance II, LLC, and Chief Power Transfer Parent, LLC. The Pennsylvania Coal Alliance and several major labor unions, including the United Mine Workers of America and the International Brotherhood of Electrical Workers, had also joined the challenge.

At the center of the dispute were environmental regulations promulgated by the Department of Environmental Protection that the energy companies and unions argued exceeded the agency's statutory authority and imposed burdensome compliance requirements on the energy sector. The Supreme Court's dismissal as moot resulted in the vacation of the underlying Commonwealth Court orders, effectively ending the consolidated litigation without a substantive ruling on the environmental regulations themselves.

The dismissal brings to a close a significant legal challenge that had the potential to reshape Pennsylvania's approach to energy regulation and environmental protection, though the moot dismissal leaves the underlying regulatory questions unresolved.