In Implications for the Power Sector of Recent Rulings by U.S. Supreme Court and FERC, Pillsbury attorneys Michael Hindus, Andrew Weissman, and Katherine Vorhis discuss an important issue the power industry is currently facing — the tension federal and state roles in power supply planning. Of note, is the U.S. Supreme Court’s April 19 decision in Hughes v. Talen Energy Marketing LLC et al. wherein the Court struck down on federal pre-emption grounds a Maryland program intended to support construction of a new 725 MW natural gas-fired generating plant in Maryland after concluding that the program invaded “FERC’s [exclusive] regulatory turf” over determination of wholesale rates for electricity. This was followed within days by FERC blocking the implementation of two Purchase Power Agreements approved by the Ohio Public Utilities Commission just days later. The tension likely will continue, and the sparring over this issue could intensify, given the states’ efforts to support continued operation of existing generating units and construction of new plants.