As the Coalition's prospects firm up heading into the last fortnight of the campaign, Ms Rhiannon says voters need to provide a clear antidote to Tony Abbott's climate-change scepticism by boosting the Greens' numbers in the Senate.

The party has five representatives in the Senate, none from NSW. The last NSW Green to occupy the red benches of the federal upper house was Kerry Nettle, who lost her spot in 2007.

The Greens are launching their NSW platform today, focusing heavily on climate change and public transport.

Ms Rhiannon will pledge to fight two new coal-fired power stations, and will push for a carbon tax to fund alternative energy sources such as wind, photovoltaics and solar thermal.

''We need to start transforming our economy now to meet the demands of the science of climate change but NSW remains firmly in the grip of the powerful polluting coal industry'' she said.

The Greens estimate that the state's electricity generation produces 10 per cent of Australia's greenhouse gas emissions.

Ms Rhiannon wants stronger investment in regional and freight rail as well as better metropolitan public transport. Greens leader Bob Brown has been making campaign appearances with her in regional NSW over the past fortnight.

''The failure on climate change has added to a cynicism in the electorate that I find quite troubling,'' she said yesterday. ''There was a clear mandate for the Labor government and we saw failure after failure.''

Ms Rhiannon said this election campaign was the biggest the Greens had ever undertaken, with campaign offices in Wollongong, Mullumbimby, Coffs Harbour, Newcastle, Ballina and Sydney.