Illinois Electric Cooperative was organized in May of 1936 to provide electric service to the surrounding rural areas. The fi ... rst electric lines in the Cooperative's territory were energized in 1938. The headquarters is centrally located in the heart of the service territory in Winchester, Illinois, serving members in the surrounding counties of Morgan, Pike, Scott, Greene, and Calhoun, with a few members located in outlying regions of Adams, Brown, Cass, Jersey, and Macoupin counties. Illinois Electric Cooperative supplies electricity and Internet service to about 14,000 accounts. read more