The number of renewable natural gas (RNG) projects across the country is rising as operators and states move to expand their alternative energy resources. 

Many of these projects are using waste from dairy farms and food, in addition to landfills, to produce RNG. 

As of January, there were 78 RNG projects under construction in the United States, according to the Environmental Protection Agency (EPA).

“The number of farm-based anaerobic digestion projects generating RNG is increasing; in California alone there are over 50 projects planned or under construction,” EPA officials said. 

The nation’s largest integrated oil and gas producers are finding benefits in gaining an RNG foothold. 

Brightmark RNG Holdings LLC, a joint venture between Chevron U.S.A. Inc. and...