 The turbines, however, were plagued with mechanical issues, and by the mid-1980s all four were out of service, standing idle on the mountain from 1985 through 1989.Green Mountain Power began operating the site in 1988, erecting a wind measurement tower and removing the four old turbines.It installed two U.S. Windpower 100 kW turbines in 1990, which ran for four years making electricity.