On June 29, 2015, the Supreme Court issued its decision in Michigan v. Environmental Protection Agency. The question in this case is whether the Environmental Protection Agency (EPA) acted unreasonably when it did not consider the costs of compliance in determining whether it was appropriate to regulate hazardous air pollutants emitted by electric utilities. -- In an opinion delivered by Justice Scalia, the Court held by a vote of 5-4 that the EPA acted unreasonably when it treated the costs of compliance as irrelevant. The judgment of the D.C. Circuit was reversed and the case remanded. -- Chief Justice Roberts, as well as Justices Kennedy, Thomas, and Alito joined the opinion of the Court. Justice Thomas filed a concurring opinion. Justice Kagan filed a dissenting opinion, which justices Ginsburg, Breyer, and Sotomayor joined. -- To discuss the case, we have Andrew Grossman, who is an associate at the law firm BakerHostetler.