JACKSON — Consumers Energy now has three large wind farms supplying power to its customers in southern Michigan with its Gratoit wind farm now online.The Jackson-based company which supplies power to parts of St. Joseph, Branch, and Hillsdale counties announced Gratiot Farms Wind Project is operational and contributing 150 megawatts of clean, renewable energy to its 6.7 million customers in Michigan."We are excited to have completed construction and bring Gratiot Farms online to serve