On June 21, 2023, the U.S. Environmental Protection Agency (EPA) announced a final rule that established biofuel volume requirements and standards for cellulosic biofuel for 2023–25 as part of the Renewable Fuel Standard (RFS) program. The cellulosic biofuel category primarily applies to Renewable Natural Gas (RNG), a form of natural gas made from biogas. The rule increases volume targets for cellulosic biofuel by 25% to 840 million gallons in 2023, by 29% to 1.09 billion gallons in 2024, and by 33% to 1.38 billion gallons in 2025 compared with the previous target.