Some of the nation’s biggest emitters in hard-to-abate sectors are pushing federal and state governments to certify the carbon-neutral qualities of mixing gas captured from rotting organic waste and rubbish dumps into tradition pipelines and energy systems.

Biomethane, a refined gas that could generate Australian carbon credit units when used in place of natural gas, is being considered by companies including PepsiCo – maker of Doritos – and at least one gas user potentially subject to Labor’s reformed safeguard mechanism, which is seeking to contract 4 petajoules of the sustainable alternative.