An opponent of a planned Ohio wind farm has filed with the state’s Supreme Court claiming that the state’s RPS, which provides incentives supporting the windfarm, is unconstitutional, because it includes a preference for in-state projects. To learn more about the controversy over this wind farm, click here. To understand the potential relevance of the Commerce Clause of the US Constitution to RPS programs, see the 2011 Commerce Clause report, written by Carolyn Elefant and Ed Holt for the RPS Collaborative.