by Emily Hammond (SCOTUSBlog) On Tuesday, the Supreme Court will hear oral argument in HollyFrontier Cheyenne Refining, LLC v. Renewable Fuels Association. The case presents an issue of statutory interpretation involving the Renewable Fuel Standard program — a part of the Clean Air Act that calls for incorporating renewable fuels into transportation fuels. With the meaning of the word “extension” at the core of the dispute, the case promises to yield insights into the justices’ interpretive stances. As clean-energy initiatives are introduced in Congress and considered by federal ...