Tasmania is being completely powered by renewable energy for the first time this year, Hydro Tasmania says.

Key points: Sustained rainfall fills dams by more than 3 per cent over 10 days

Sustained rainfall fills dams by more than 3 per cent over 10 days All diesel generators and gas power stations have been turned off

All diesel generators and gas power stations have been turned off Rough weather hampers repairs to Basslink cable

The state has been in crisis for several months with dam levels at record lows after unprecedented dry weather.

The crisis was compounded by the outage of the Basslink undersea cable left the state unable to draw on the national power grid.

Sustained rainfall in dam catchments across the state over the past week has seen dam levels rise by more than 3 per cent.

Hydro Tasmania CEO Stephen Davy said the state's emergency diesel generators had been switched off through the week and the gas fired Tamar Valley Power Station was turned off yesterday.

"The past 10 days have been very positive," he said.

"We've had more rain than predicted and our storages have risen strongly.

"There's currently enough hydro and wind energy available to meet all Tasmanian demand.

"For the first time in months, our island is being powered solely by renewable energy."

The Cethana power station in the north west is one dam that has benefited more than most.

It is at capacity and water has been pouring over the spillway since yesterday.

Rain fills dams but hampers Basslink repair

And while the wet weather was welcome news for Hydro dam levels, it hampered efforts to fix the broken Basslink cable.

The cable repair ship is unlikely to leave Geelong again until tomorrow because of gale force winds.

But Premier Will Hodgman said Basslink was still on track to be fixed by mid June.

"There's no advice to suggest that there will be an extension to the return to service date," he said.

"Basslink are obviously doing what they need to get the cable repaired, that's the priority."