The money saved is a result of using the Energy Switch service.

Minister for Energy and Environment Matthew Kean said the initiative works by using a customer's latest energy e-bill and comparing it with every retailer in NSW before presenting the top three plans available.

"If a switch is requested, Service NSW will make all the arrangements," he said.

Premier Gladys Berejiklian said winter is here, so now is the time to compare gas and electricity plans.

"It takes only minutes but could save hundreds of dollars a year," she said.

"Energy Switch helps ease the cost of living for families by helping them find the best deal."

Around 7,000 households have already switched electricity providers across the state, bringing close to $3 million in annual savings since the free service launched last year.

The average saving per household is more than $400 a year.

It's available at any Service NSW Centre or at https://energyswitch.service.nsw.gov.au/.