Million-dollar government granted feed-in tariffs have made a handful of large-scale projects a safe bet, while more than a dozen proposed developments in the Southern Tablelands and Monaro may never be built as uncertainty remains around the Renewable Energy Target.

There are at least 14 announced large-scale NSW projects within the regions surrounding Canberra, with all except one a wind farm. While some have had government approval for nearly a decade, only three are in construction.

Donna Bolton, project manager for Epuron, the company looking to build three wind farms near Yass, said the projects would be at risk if the legislated 2020 target of 41,000 gigawatt-hours of renewable energy was cut.

Ms Bolton said the ACT government's announcement this year of a reverse auction to provide guaranteed income for 200 megawatts of wind energy was a potential saviour for investment-starved proposals.

"Credit to the ACT for its wind option, it has been an oasis in what has been a difficult time," she said.

Bids for the auction are understood to now close in September, with companies including Infigen Energy and RATCH-Australia having confirmed an interest. The 200 megawatts would provide 24 per cent of the territory's expected electricity usage in 2020, part of the aim to have 90 per cent of electricity supplied by renewable resources.

While some NSW locals and their MPs have voiced opposition, projects can be considered if they are within the "Australian Capital Region" or otherwise offer exceptional economic benefits for the ACT renewable sector.

Australian Solar Council chief executive John Grimes said the three ACT solar projects - Royalla, OneSun Capital and Mugga Lane - which had won ACT government feed-in tariff rights were cushioned, but he was aware of another three large, unannounced solar projects planned for in or near the ACT which had no hope of being built.

"The ACT government is the bright spot in this region," he said.

Infigen Energy has confirmed its approved Capital solar farm near Bungendore is at risk if the RET is scaled back.

Last week the NSW Coalition government announced its plan to become "Australia's answer to California", promising to install solar panels on as many public buildings as possible and encourage more wind farms, as it backed the national 41,000 GW-h goal.