State-owned operator TT-Line has confirmed Spirit I and II will stop sailing from October 24 and says a sale process has been underway for some time. Chief executive Chris Carbone said there was "interest in the ships", but ruled out the vessels being moored in Tasmania.
"Depending on when the ships are sold will determine where they are stored, there are no berths in Tasmania," Mr Carbone said.
TT-Line would not say where the ferries would be moored or what this would cost if they remained unsold when the new Spirit IV and V began operating. The two new ferries have been moored in Geelong, a cost the company has previously put at between $600,000 a month in Scotland and $900,000 a month in Geelong.
Earlier this year, a parliamentary inquiry heard the total cost of the new ferries was more than $700 million above forecast, a figure that did not include the cost of berthing them in Scotland and Victoria while a new deeper water berth was built at Devonport. The same committee heard TT-Line was expected to remain in debt until 2052.
The Tasmanian government has expressed confidence a deal will be secured to sell the decommissioned ships. Labor infrastructure spokesperson Anita Dow questioned whether the sale was progressing.
"They've said they've got interest from buyers in acquiring those old vessels, but they've gone quiet for some time now about whether there's actually been a successful follow-through," she said.
"The government should be providing regular updates to the community about this process, about what these plans are for the old ships. That's only fair and reasonable given the amount of public money that's involved."