Aurora Energy has not denied Tasmania's big businesses are paying less carbon tax than householders, saying it is not a simple issue.
Aurora's managers have been quizzed by Lower House MPs at a government business hearing.
The Opposition's Matthew Groom repeatedly asked managers to reveal the total amount Tasmanians will have to pay Aurora under the carbon tax.
He asked them to explain why carbon tax bills varied so much.
"Why do households and small businesses pay more than three times the carbon tax that large businesses do?" Aurora's corporate affairs manager Rick Inglis said there was no simple answer.
"It's not one calculation for every every customer, it depends on their contract and what their circumstances are," he said.
Chief executive Peter Davis said revenue was projected to increase by 5.6 per cent because of the tax but he did not have a lump sum figure on hand.
Energy Minister Bryan Green accused Mr Groom of playing politics, attempting to smear the Government for a decision made by the Commonwealth.
He said an independent regulator sets power price hikes for household energy use.
"You're just being shifty," he told Mr Groom.
"What the Honourable Member is trying to establish is a large figure that he is then going to say is being taken out of the pockets of Tasmanians." The Deputy Premier pointed to millions of dollars in Government assistance which helped keep power prices down.
He said the last price rise was the second lowest in the country.
Later in the hearing, Hydro Tasmania's chairman David Crean said the power generator would reap $70 million from the carbon tax.
"We expect over the next 12 months that our wholesale revenue will increase by around $140 million, half of which will be due to the carbon uplift, half of which will be due to increased generation and we're on track to produce a profit next year of $240 million."