The first phase of the Stetson project began operating in January 2009 and was the largest in the state at 57MW.
The expansion, approved last March, will add 26MW for a total of 83MW. Construction of the additional turbines, managed by Reed & Reed, began in November.
First Wind, based in Boston, will sell half the energy, as well as renewable energy credits, from the second phase of the Stetson project to Harvard University.
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