Wyo. Stat. § 40-9-103
Whenever any complaint is made, as provided for in W.S. 37-2-118, that the heat units of the natural gas supplied by any utility to the users thereof in any town or municipality are below the standard thereof theretofore used as a factor in the basis for rates to be charged by the utility in that particular town or municipality, the public service commission shall notify the state chemist to make proper tests of the heating units of the gas furnished by such utility to the complaining municipality. The state chemist shall certify to the public service commission and to the mayor of the complaining town or municipality the result of such test, which said certificate shall be used as competent evidence by the public service commission at the hearing of said complaint, and shall be used by the commission as one (1) of the factors as a basis for any change in the rates the commission may find necessary to make.
W.S. 40-9-103