A new Wagga solar farm will help power Sydney Town Hall along with inner-city pools, sports fields, depots and buildings under a $60 million deal announced on Tuesday.
Future electricity generated from a solar farm outside Wagga will help the City of Sydney council power its operations with 100 per cent renewable energy.
Electricity from the Bomen Solar Farm project, currently under construction, will be combined with output from a Glen Innes wind farm and a community-owned solar scheme near Nowra.
City of Sydney Mayor Clover Moore said the deal was the "biggest standalone renewables commitment for an Australian council" and would help support jobs in drought-affected regional areas.
The deal will allow the council to cut its emissions by 20,000 tonnes a year - equivalent to the power consumption of 8000 households - and save up to half a million dollars a year.
Solar power will make up 25 per cent of the megawatts purchased under the new deal.
The electricity was purchased through retailer Flow Power and the firm's chief executive Matthew van der Linden said the deal was an "important step in Australia's transition to a low-carbon future".
"If just 20 per cent of the market followed the City of Sydney's lead, it would drive investment in 11 gigawatts of new renewable generation - that's double the current pipeline of renewable projects," Mr van der Linden said.
The $188 million Bomen Solar Farm project outside Wagga was acquired by Spark Infrastructure in April, with the company moving to start construction on the 250 hectares of industrial-zoned land.
The solar farm's first panel was installed during a ceremony in August.
The site is located about 10 kilometres north of Wagga near the Byrnes Road and Trahairs Road intersection.
About 26 per cent of the Bomen farm's power output for 10 years has been pre-purchased by Westpac as part of the bank's goal to use 100 per cent renewable energy.