The Sapphire wind farm, 28km east of Inverell, is already contracted to supply 100 megawatts to the ACT government.

Coming on line in 2021 is the controversial Bango wind farm, using the tallest towers and biggest blades of any onshore site in Australia.

The 244 megawatt Bango wind farm will be the third largest in NSW. The project was racked with controversy when 122 turbines were first proposed in 2016, but given the green light when scaled back to 46 turbines, each 200 metres tall.

The November reverse auction will be the fifth held by the ACT government with wind farms at Crookwell and Hornsdale, in South Australia, among previous winners.

This package is a little different as it must include a modest battery storage, which will provide frequency and voltage control, and act as a back-up power source.

"Obviously a good price will be a key determinant [for a successful bid] but we will also be looking for a proven track record from the companies and their level of community engagement," Climate Change and Sustainability Minister Shane Rattenbury said.

He said that the physical location for the ACT battery storage was undecided as it could be in one location or split into several.

"We are still learning in this [battery storage] space," he said.

"Large scale batteries are still relatively new. I'm really pleased that the ACT is getting involved in this as it will bring both additional knowledge and further Canberra's reputation as a centre of excellence when it comes to renewable energy and new technologies."

One of the ongoing problems with sharing power across the states and territories and allowing renewables to become cost-competitive is the existing transmission infrastructure.

"We are in a point of transformation in the national grid," he said.

"We need to get on with it, and the federal government needs to take some national leadership in that space."