The City of Sydney committed to buy its electricity from three regional locations including Repower Shoalhaven in Nowra, at the 270 megawatt Sapphire Wind Farm near Glenn Innes in northern NSW and 120 megawatt Bomen Solar Farm near Wagga Wagga.

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Renewable electricity will power all city-owned properties including pools, libraries, playing fields, depots and council buildings - including the historic Sydney Town Hall.

A community solar farm project has been developed with Repower Shoalhaven.

The construction cost close to $5 million and will generate enough energy to power close to 1,000 NSW homes.

Repower Shoalhaven spokesperson Robert Hayward said the green power purchase plan will directly support the Shoalhaven.

"We are proud to be a part of this significant commitment from the City to advance a sustainable decarbonized future," Mr Hayward said.

"This will enable a regional community to participate through the purchase of power from our not for profit scheme and support local jobs. Thank you, City of Sydney."

Sydney Lord Mayor Clover Moore said the project will see the city's operations cut emissions by around 20,000 tonnes a year.

"The announcement is the biggest standalone renewables commitment for an Australian council," she said.

"The science is clear, without urgent, co-ordinated and global action to reduce emissions in the next decade, we face a very high risk of triggering runaway climate change."