All advertising contracts of public utilities shall be made at regular, established, commercial advertising rates; and such contracts shall be open to inspection by the commission and the department of energy at all times.
Source. 1913, 99:2. PL 242:24. RL 292:25. 1951, 203:46 par. 24, eff. Sept. 1, 1951. 2021, 91:290, eff. July 1, 2021.