Government legislation may be blocked from debate in Tasmania's Upper House after the Treasurer refused to comply with a legal summons, the Opposition warns.

It is just one of the scenarios which could play out after Peter Gutwein refused to hand over an unredacted copy of the advice the Government took prior to approving the sale of the Tamar Valley Power station in 2015.

A legal summons was issued requesting the advice by the powerful Public Accounts Committee, which is examining Tasmania's energy crisis.

The decision not to supply the document could see the Treasurer held in contempt of Parliament, a matter which has now been referred to both houses for further consideration.

The Government is likely to use its numbers in the Lower House to defeat any potential censure, but it could be a different story in the independent-dominated Upper House.

Opposition spokeswoman Michelle O'Byrne said while the Upper House could not punish Mr Gutwein directly, it could still make life difficult for the Government.

"What it can find under the privileges act is that the Treasurer has behaved and is in contempt of Parliament," she said.

"They could for, instance say, to the Leader of Government Business 'you must table that letter, it must be brought to the Parliament'.

"And if the leader of Government business fails to do so, then they could choose, for instance, to stop debating government legislation until such as a time as it's provided."

That could cause problems for the Liberals with controversial forestry legislation and changes to the anti-discrimination act still to clear the Upper House.

Just 'political theatre': Minister

Ms O'Byrne said it could also cause problems around the time of the budget.

"We are on the cusp of a budget so it is a serious matter should they choose to find him in contempt of parliament," she said.

Senior Government Minister and Leader of Government Business in the Lower House, Michael Ferguson, is not buying into the matter.

"This is just political game playing and theatre, what matters to Tasmanians is energy security, that's what we've provided," he said.

Mr Ferguson also would not say whether the Government would block any move to censure Mr Gutwein over the Treasury advice controversy.

"It's all speculation we are just not going to be drawn into these political games but these are matters that are appropriately being dealt with," he said.