Adams-Columbia Electric Cooperative is a rural electric distribution cooperative serving approximately 36,000 member/owners in parts of 12 Central Wisconsin counties.

ACEC's geographic service area includes approximately 2,500 square miles in the central Wisconsin counties of: Adams, Columbia, Dane, Dodge, Green Lake, Jefferson, Marquette, Portage, Sauk, Waupaca, Waushara and Wood.

Adams-Columbia Electric Cooperative is a rural electric distribution cooperative serving approximately 36,000 member/owners in parts of 12 Central Wisconsin counties. As such, it is the largest rural electric cooperative in Wisconsin and the largest in Region Five of the National Rural Electric Cooperative Association.

Adams-Columbia was formed in 1987 following the successful merger between the former Adams-Marquette Electric Cooperative and the former Columbus Rural Electric Cooperative. In 1992, a second successful merger combined Adams-Columbia with the former Waushara Electric Cooperative.

The cooperative's service center is in Friendship, Wisconsin. ACEC also maintains operations facilities in Pardeeville and Wautoma. Adams-Columbia presently employs 92 full-time employees and 3 part-time employee. The organization is governed by a member-elected, 11-person board of directors.