On June 30, 2014, the U.S. Supreme Court announced that it would not review the constitutionality of the California Low Carbon Fuel Standard (LCFS). This decision is largely viewed as a win for the California Air Resources Board, the governmental body that regulates the LCFS, and supporters of the law.

On March 20, 2014, Growth Energy and the Renewable Fuels Association (RFA), which represent the ethanol industry, and the American Fuel and Petrochemical Manufacturers (AFPM), along with the American Trucking Association and the Consumer Energy Alliance, filed petitions for writ of certiorari with the U.S. Supreme Court to make a final determination on the constitutionality of the LCFS.

The groups challenged the January 2014 decision of the U.S. Court of Appeals for the Ninth Circuit (the Ninth Circuit) to deny rehearing en banc in Rocky Mountain Farmer's Union v. Corey. On September 18, 2013, the Ninth Circuit issued its opinion in Rocky Mountain Farmer's Union v. Corey reversing a lower court opinion that found that the LCFS violated the dormant Commerce Clause of the U.S. Constitution by discriminating against ethanol produced outside of California. The LCFS assigns higher carbon intensity values to ethanol produced in the Midwest than in California.