The 56 wind turbines for the farm will not all be in place by then but each will generate electricity from the time they are installed and fed into the state grid.

Hydro Tasmania community engagement office Christina Giudici said that all 56 turbines would be erected by the end of May ready for the farm to be fully commissioned by July.

"But they will each be generating electricity from the start - that will start in February," she said.

"It will go to the Derby substation and into the grid."

Ms Giudici said that construction of the turbines, consisting of Danish-made Vestas blades and towers manufactured at Haywards, at Western Junction, will begin in earnest after Christmas.

The blades and wind tower parts are being assembled on site in preparation for the arrival of a 1200-tonne crane from Western Australia, which will help lift them into their new bases.

"There are only half a dozen cranes that big in the world," she said.

"It has a collapsible boom so that it can be moved easily from one location to the next."

Musselroe wind farm project manager Justin Couper said that the V90 turbines being installed at the North-East site were the "Rolls- Royces", of wind turbines.

"They have been built for the class of wind they will face - they are the biggest you can get," he said.

He said that the Cape Portland site for the Musselroe farm registered about the same strength of winds experienced at Hydro Tasmania's other wind farm on the far North-West Coast at Woolnorth.

Musselroe will have a total generating capacity of 168 megawatts when completed, which is sufficient to power 50,000 homes.