The bill passed the Parliament's upper house this week after government MPs said the 50 per cent target would not only help the environment, but mean more jobs, more investment and lower power bills.

Before that, Liberal Democrat Mr Quilty had taken the opposite view.

"The 50 per cent figure is not the result of a calculation or an estimate; it was chosen because it sounds good - how dare you," he said.

"This target is a promise that the government will spend more of your money, exert more control over your lives, increase the taxes you pay, increase electricity prices and reduce electricity reliability."

IN OTHER NEWS:

The Liberal Democrats have pushed for nuclear energy to be part of the future, but the government has not included that in its plans.

Mr Quilty said society powered by wind and solar was "a bad idea" and initiatives aiming for 100 per cent reliance on renewable energy were "doubling down on the stupidity".

He said the manufacture and disposal of lithium batteries, used to store excess power generated by sun and wind, were also bad for the environment.

Solar and wind farms are being constructed in regional areas, including multiple solar farms on both sides of the border.

"You can be sure the blackouts will be in regional Victoria, not in Melbourne," Mr Quilty said

"All of this is conveniently out of sight and out of the minds of the inner-city people who would rather think that their coffees are heated by the electricity fairy.

"Our energy future is one of unreliability, and the government is ploughing into it at full speed."

Energy, Environment and Climate Change Minister Lily D'Ambrosio said legislation was to reach the 50 per cent renewable energy target by 2030.

"Victoria is the renewable energy capital of Australia and strengthening the VRET in law will keep it that way - boosting jobs, reducing emissions and driving down energy prices," she said.