No person desiring to construct or operate a facility for gathering, extracting, purifying, dehydrating, or otherwise treating landfill methane shall be required to obtain any certificate of public convenience and necessity for such construction or operation of such facility from the Tennessee public utility commission. Neither the rates and charges between the parties for construction and operation of any such facility, nor the sales price of any landfill methane produced or treated, shall be subject to economic regulation by the Tennessee public utility commission or any other agency of the state; provided, that the construction and operation of any facility for such operations shall be subject to all other applicable laws.