The Mid-American Regulatory Commissioners (MARC) represents an association of regional organizations of utility and energy regulatory agencies from 15 states that include:  Arkansas, Kansas, Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, Oklahoma, South Dakota, Texas and Wisconsin. 

Since 1956, the MARC has sponsored an annual meeting and conference of Commissioners and staff from member state agencies, as well as representatives of regulated industries and the public at large, to share ideas and discuss regulatory and policy issues affecting their states, region and the nation.