Fresh research from energy consultancy Reputex shows investment aligned with the NSW renewables road map will provide a cheaper and lower emissions option to replace AGL's ageing Liddell coal fired power plant compared to the business as usual case and the federal government's preferred gas-peaker option.

The NSW renewable road map "green market" scenario, where wind and solar power are backed up by batteries, would generate 17 per cent cheaper electricity and fewer emissions than replacing Liddell with gas, according to the Scenarios for the replacement of the Liddell power station report commissioned by Greenpeace.