Renewable natural gas (RNG) volumes and production sites increased significantly over the past two years in the United States, an assessment that comes as advocates are searching for ways to expand even further.

Consultancy Energy Vision LLC completed a report in December in conjunction with the Argonne National Laboratory, which found a 42% increase in production projects from early 2019 through 2020. 

Energy Vision President Matt Tomich said RNG was “a powerful tool for reducing climate impacts.”  Argonne transportation analyst Marianne Mintz said the renewable fuel could decarbonize “a significant share” of the energy consumed by heavy duty vehicles and other end-uses for natural gas.

According to the report, there were 312 production sites nationwide at the end of...