28 U.S.C. § 1342: Rate orders of State agencies

The district courts shall not enjoin, suspend or restrain the operation of, or compliance with, any order affecting rates chargeable by a public utility and made by a State administrative agency or a rate-making body of a State political subdivision, where:(1) Jurisdiction is based solely on diversity of citizenship or repugnance of the order to the Federal Constitution; and, (2) The order does not interfere with interstate commerce; and, (3) The order has been made after reasonable notice and hearing; and, (4) A plain, speedy and efficient remedy may be had in the courts of such State.