The federal government has written to the Australia Energy Regulator asking it to investigate claims Queensland's government-owned power generators have been price-gouging.

In the latest development in the long-running stoush between the two levels of government over power policy, Energy Minister Josh Frydenberg on Monday wrote to the AER asking it to look into pricing practises used by Stanwell and CS Energy.

Queensland Opposition Leader Tim Nicholls mentioned the issue several times in his speech to the LNP state convention on Sunday Credit:AAP Image/Darren England

It comes after the Liberal National Party wrote to the Australian Consumer and Competition Commission last week asking it to investigate claims the generators had been using the market to drive up power prices, which generated higher dividends for the state government.

Queensland Opposition Leader Tim Nicholls mentioned the issue several times in his speech to the LNP state convention on Sunday, and promised to bring the issue up every day until the state election, due early next year.