The joint report from Beca, Firstgas Group and Fonterra claims the potential to replace nearly 20 per cent of New Zealand's total gas usage by 2050.
Firstgas Group chief executive Paul Goodeve says we have a decent prospective source of bio-gas.
He says were we to make bio-gas into gas suitable for the distribution network ... we could remove the equivalent of 415 thousand cars off our roads, in terms of reducing emissions.