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 is headquartered in Waukesha, Wisconsin, and has manufacturing facilities in Berlin, Oshkosh, Jefferson, Eagle, and Whitewater; all in Wisconsin. Wikipedia