The review – led by climate-sceptical businessman Dick Warburton – offers several scenarios for the future of the RET, which currently mandates for 41TWh of generation by large-scale renewables by 2020 supported by renewable energy certificates.

One option is to allow the large-scale RET to continue to operate until 2030 with grandfathering of support under the scheme for "existing and committed renewable generators", but closing it to new entrants.