La. Stat. tit. 45 § 255
The Louisiana Public Service Commission shall establish and enforce reasonable rates and regulations for gathering, transporting, loading and delivering petroleum, by any common carrier as defined in R.S. 45:251, and for the furnishing and use of reasonable tank facilities necessary and incident to such transportation and that may be necessary, in its capacity as a common carrier only, to take care, for a reasonable time, of all petroleum transported by it, and to prescribe and enforce regulations for control of these common carriers in respect to their pipe lines and receiving, tanking, delivering, transferring and loading facilities. It shall exercise this power upon petition by any person showing a substantial interest in the subject. No order requiring the furnishing of such facilities or establishing or prescribing rates, rules and regulations shall be made, except after hearing after at least ten days and not more than thirty days notice to the person owning, controlling, managing or operating the pipe lines affected. If any rate shall be filed by any pipe line and a complaint or petition to reduce the rate is filed by any shipper or owner of petroleum, and such complaint is sustained in whole or in part, all owners and shippers of petroleum, who shall have paid rates so filed by the pipe line have the right to reparation or reimbursement of all excess in transportation charges above the proper rate as finally determined, on all shipments made within six months prior to the date of the filing of the complaint.
La. R.S. § 45:255