Perhaps the best option for decarbonizing thermal energy on campus is renewable natural gas (RNG). RNG is a drop-in solution that can be generated from a variety of technologies — most notably from upgrading biogas produced from anaerobic digestion — and used in existing infrastructure such as at Abbott Power Plant. Argonne National Laboratory publishes a database of RNG projects divided into the following categories: farms, food waste, landfills, wastewater treatment, and other waste. The Argonne database shows an increase of 53% from 2017 to 2019, and a total 2019 production capability of about 45 million MMBTU. This is a growing opportunity that the university will pursue for clean energy.