The cable was out of service late last month, due to damage to a piece of equipment at a Victorian converter station caused by a contractor performing scheduled maintenance works.

Basslink Pty Ltd had anticipated it would take two weeks to repair the damage.

In a statement on Tuesday, BPL said while the repairs had been completed, the company required specialist people and equipment to be brought in to return the interconnector to service.

“For the past week, Basslink has worked around the clock in liaison with its manufacturing partners to develop a repair and re-pressurisation procedure, source the necessary people and equipment, and finalise all associated logistics,” it said.

Energy Minister Guy Barnett described the delay as “very disappointing” but said dam storages were secure at 37 per cent.

“I would, however, like to make it very clear – there is no threat to Tasmania’s energy security,” Mr Barnett said.

He said the main cycle at the Tamar Valley Power Station could be switched on at short notice if required.

Hydro Tasmania chief executive Steve Davy said autumn had produced above-average inflows which meant the company could manage the state's energy needs without the ability to import.

At the height of the energy crisis, dam levels sunk to 12.5 per cent as a result of the Basslink outage and drought conditions.

It cost the state up to $180 million.

Labor’s energy spokesman David O’Byrne said there was no guarantee that the problem would be fixed in six weeks. 

He said with the government in a dispute with Basslink over the 2015 failure, it was apparent that their relationship had broken down.