The Brattleboro Reformer reports the state Public Service Board approved the plan last week.
The electricity produced will meet about 71 percent of the facility's yearly electricity consumption needs.
The project will be located on about 17 acres of land. The location is a reclaimed gravel pit that is permitted for redevelopment as an industrial business park.
Spencer-TGC Westminster had filed the application in February.
The Westminster Select Board had said the town could lose valuable land for potential businesses, resulting in a decreased tax base over the long-run.