The Berejiklian government has its first move into large-scale renewable energy, signing a decade-plus contract to help underpin the new Dubbo Solar Hub in the state's central west.

The signing with Neoen Australia, to be announced on Friday, will begin from mid-2019 and run to the end of 2030, and help the government meet almost one-sixth of its obligations under the Renewable Energy Target (RET).

The Moree solar farm in NSW, one of many now operating, under construction or in the pipeline.

"This lays the foundation for more renewable energy procurement, which will deliver more power supply for the state, and put more downward pressure on prices," Don Harwin, Energy Minister, said.

The 24-megawatt solar hub will involve farms in Narromine and South Keswick, and is one of five in NSW to secure part of a $34.9 million large-scale solar fund set up last year by the Australian Renewable Energy Agency.