Source:
"Southern California residents now have the option to pay a little
extra to get some of their natural gas from landfills and cow manure.
... Southern California Gas and San Diego Gas & Electric to sell what the utilities call “renewable natural gas” or “biogas” that comes from capturing methane from manure lagoons at dairy farms, landfills and elsewhere.
... Under their proposal, customers can pay a higher rate to have it blended into the natural gas piped into their homes and businesses.
Environmental groups, however, oppose the idea, saying biogas does little to cut emissions or address the environmental impacts of industrial dairy farms."