Treasurer Tim Nicholls has described Queenslanders who took part in Labor's solar bonus scheme as "champagne sippers and the latte set", while labelling the program "middle class welfare".

In an attack on the opposition during parliamentary question time on Thursday, Mr Nicholls took a question from LNP MP Kerry Millard on "how the government is building on its strong plan for a brighter future".

Treasurer Tim Nicholls has decribed Queenslanders who took part in Labor's solar bonus scheme as "champagne sippers and the latte set".

He used the question to criticise Labor's economic track record and - encouraged by an interjection from the Premier who has solar panels on his home, but does not receive the 44-cent feed-in-tariff - turned into an attack on those who do.

"The only idea he [Curtis Pitt] has put forward in terms of dealing with anything of economic sense was to reintroduce the solar bonus scheme...how did that work? It worked by adding $3 billion to the cost of power bills for Queenslanders to 2027-28," he said.