The abolition of the carbon tax has saved Queensland homes more than $200 a year on power bills, according to the Vinnies.

But the charity wants a ban on late payment fees that it says adversely affect disadvantaged households.

A new report has found the benefits of electricity privatisation may be overstated. Credit:Bloomberg

TheSt Vincent de Paul's July 2015 report into Queensland energy prices found power costs dropped $375 on average for Tariff 11 homes, and $270 for Tariff 12 homes.

$230 of that came from the repeal of the carbon tax, which was enacted in July 2014, and the rest from Australian Energy Regulator's price determination for network businesses.