The proponents of a $280 million Tasmanian wind farm have struck an in-principle deal for energy supply.

WestCoast Wind has plans for a 33-turbine wind farm at Granville Harbour, which is expected to create about 200 jobs during its construction, and eight permanent jobs.

It has now cleared a major hurdle by securing an agreement with the Tasmanian Government to buy the wind energy for the state-owned monopoly power supplier Hydro Tasmania.

“The Cabinet has endorsed Hydro Tasmania entering into an agreement to purchase the power for the Granville Harbour wind farm,” Energy Minister Matthew Groom said.

The deal should see Hydro buy about 360 gigawatt hours of energy and renewable energy certificates a year from the proposed wind farm.

“It is important from an energy security perspective,” Mr Groom said.

WestCoast Wind's Alex Simpson said the company now had to secure a primary investor.

“We've got a number of investors that are champing at the bit to take this on, but there's quite a rigorous process and robust process that we are going through,” he told the ABC.

Mr Simpson said the investor would have to be “committed totally to the project but also the people on the west coast”.

The company is looking to start construction and initial works in September for a completion date in early 2019.

Hydro Tasmania's Steve Davy welcomed the ever-growing focus on renewables.

“The proposed Granville Harbour and Cattle Hill wind farms contribute towards plans to make Tasmania the battery of the nation,” he said.