With an estimated savings of $625,000 over a 20-year period for the town, the Rochester Selectmen entered into an alternative energy resource agreement on Monday night with a wind turbine project.

On July 30, the Selectmen signed a 20-year deal with Future Generation Wind.

Keith Mann, owner the Plymouth-based company and Mann Farms, said that the wind turbines would be constructed on his cranberry farms located just off of Route 25.

Town Administrator Richard LaCamera supported the proposal. Besides the 20 to 30 percent in savings on the town’s electric bills, LaCamera said that the town would not be responsible for any construction costs.

“With no investment required for the town, this certainly is an advantage,” LaCamera said.

Once constructed, the wind turbines would generate enough net metering credits to reduce the town’s monthly electric bill with NSTAR by 20 to 30 percent, depending on the fluctuating rates of electricity.

Mann said that he anticipates construction to begin next year, which would allow the deal with Rochester to go into effect in January 2014.

For the past few months, Rochester officials have been negotiating with the town of Marion and representatives from the Old Rochester Regional School District to find an alternative energy resource that would help lower utilities costs.

Last week, both the ORR School Committee and the Marion Selectmen also entered into the agreement with Mann.

Another benefit for Rochester would be seen in the town’s assessments from the ORR School District. Currently, the three towns – Marion, Mattapoisett and Rochester – are assessed an amount for both the Junior and Senior High Schools’ budgets based on the number of students enrolled from each town.

Now that the ORR School Committee has signed a deal with Future Wind Generation, LaCamera said he expects that Rochester’s assessments will be substantially lower. Marion Town Administrator Paul Dawson mirrored this sentiment last week.

“It’s a win-win for everybody,” LaCamera said. “It’s a good thing.”