The Island’s largest wind turbine to date was installed Monday morning on the rolling hills of the Allen Farm in Chilmark. Once complete, the turbine will be 149 feet tall.

The turbine will produce 125,000 kilowatt hours per year, double the amount of energy the pastoral sheep farm uses, and is expected to be in full operation within the month.

“I hate the wind,” farm owner Mitchell Posin said of the salt spray that usually covers the land he and wife Clarissa Allen own. “Now we get to use it for something good.”

The team from Great Rock Windpower of Oak Bluffs arrived at 7 a.m. to begin staging the area. The first of three sections was in place by 9 a.m. Once fully installed, 42,000 pounds of machinery will sit atop the hill off South Road.

Mr. Posin and his son Nathaniel Allen-Posin helped hoist the turbine into place, screwing in the last bolts of the base of the tower. Mr. Posin said he hoped it would set a precedent for future farmers.

“If every farmer could do that it would help the world tremendously,” he said.

The turbine was approved in January after the Chilmark zoning board of appeals upheld two building permits for the Allen Farm and Grey Barn, also on South Road. The permits were issued under a special agricultural exemption that allows working farms to skip the normal permitting process.

Mr. Posin said he invited the entire neighborhood to the installation and hoped to be as transparent as possible.

“We’re hoping it’ll be here, people will see it and the tension of the anti will subside,” he said.

Construction is expected to last all day. The blades should be rotating by tomorrow.