This case law update describes a selection of renewable energy cases from 2015. It is not intended to address all renewable energy cases over the previous year, but rather, highlight a few that are more likely to be of interest to the attendees of this conference and those involved in the renewable energy industry, including developers, investors, consultants, attorneys, and other counselors. The discussion of cases begins with a status update on the challenges to the Environmental Protection Agency’s (“EPA”) regulation of carbon dioxide (“CO2”) emissions from existing electric generators and then proceeds through a series of environmental cases, cases challenging the constitutionality of state renewable energy standards and conflicts with federal law, a selection of contract cases, and concludes with a short discussion of nuisance and trespass cases.