The National Energy Guarantee will improve the reliability of power supplies and help bring down prices and create jobs, South Australian Premier Steven Marshall says.
Mr Marshall says his government will back the NEG at Friday's meeting of energy ministers in Canberra.
"We do this because fundamentally we are about lowering prices, making sure we have a reliable grid and doing this in an environmentally sustainable way," he said.
"We are convinced that a national approach is the right approach to take."
Mr Marshall said South Australia currently had the highest priced and least reliable energy in the nation and it was incumbent on the state government to do everything it could to lower the cost burden on households and businesses.
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"We believe the NEG is exactly and precisely what is needed," he said.
The SA premier said he believed the guarantee would get the support of coalition party room despite concerns from some MPs.
He also urged Victoria to put the interests of the people first and support the plan.
"My message to (Premier) Daniel Andrews is get on board," he said.
"Anything other than a national approach is going to deliver higher prices and a less reliable grid."
