When coal prices hit prices of record $280 per tonne in 2023, Adani sold Queensland coal to Indian buyers for $100 per tonne.
The Australia Institute report found this drastically reduced the royalty payments Queenslanders were entitled to.
The Crisafulli LNP Government abandoned court action to recoup the payments earlier this year, a case that was started by the former Labor Government.
The Queensland Greens are demanding the Queensland Government to release the details of its secret deal with Adani.
“Adani has stolen $400 million from our schools, our hospitals, our housing system,” said Queensland Greens MP Michael Berkman.
“That money could have funded a public housing developer or a year of free school breakfasts, and instead it’s lining coal bosses’ pockets.
“This company has failed to deliver on jobs, failed to deliver on community infrastructure, failed to pay a cent of corporate tax, and now we know they’ve failed to pay the royalties that Queenslanders are due.
“Premier Crisafulli needs to show some guts and get Queenslanders’ money back,” Mr Berkman said.