Interpower is the premier supplier of power system components worldwide. We offer no minimum order requirements, a 1-week U.S. manufacturing lead-time on non-stock Interpower products, and same day shipments available on stock items. Interpower is the premier supplier of power system components worldwide. Founded in California in 1975, Bob Wersen, President of Interpower, has made it easy for customers to design, build, and maintain products for worldwide markets ever since. Now based in Oskaloosa, Iowa, Interpower manufactures cord sets and power cords in the United States for the North American and international markets and has an office in the United Kingdom.