United States v. State of New York, et al., 623 F.3d 455 (7th Cir. 2010)

(changes made to coal-fired electrical energy generation plant did not violate federal law because they didn't increase hourly rate of sulfur dioxide emissions even if plant's annual emission increased; hourly capacity interpretation was included in state plan for implementing Clean Air Act which EPA approved; Clean Air Act does not authorize imposition of sanctions for conduct that complies with state plan that has been EPA-approved).