Associated Electric Cooperative, Inc. (AECI) The nation’s second largest generation (see Generator) cooperative. Based upon kiloWatthour sales Sho-Me’s owns approximately 27 percent (as of spring, 1997) of AECI. The shaded areas in the map to the right shows the service territories of the utilities AECI has interchange agreements with. AECI’s World Wide Web (WWW) site is: http://www.aeci.org (see Hypertext Transfer Protocol (HTTP) ).