Calpine Corp. v. Pennsylvania Department of Environmental Protection Filing Date: 2022Case Categories:State Law Claims Industry Lawsuits Principal Laws:State Law—Air Statutes, Pennsylvania Air Pollution Control ActDescription: Power plant operators' challenge to Pennsylvania regulations implementing participation in the Regional Greenhouse Gas Initiative. Calpine Corp. v. Pennsylvania Department of Environmental Protection Docket number(s): 357 MD 2022 Court/Admin Entity: Pa. Commw. Ct. Case Documents: Filing Date Type File Action Taken Summary 11/07/2023 Memorandum Opinion Download Petition for review dismissed as moot after regulation declared void in two other proceedings. 07/12/2022 Petition for Review Download Petition for review filed.