Generac Holdings Inc., commonly referred to as Generac, is a Fortune 1000 American manufacturer of backup power generation products for residential, light commercial, and industrial markets. Generac's power systems range in output from 800 watts to 9 megawatts and are available through independent dealers, retailers, and wholesalers. Generac has headquarters in Waukesha, Wisconsin, and manufacturing facilities in Berlin, Oshkosh, Jefferson, Eagle, and Whitewater, all in Wisconsin. Wikipedia