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. (1)
   (1)Jurisdiction is based solely on diversity of citizenship or repugnance of the order to the Federal Constitution; and,
2. (2)
   (2)The order does not interfere with interstate commerce; and,
3. (3)
   (3)The order has been made after reasonable notice and hearing; and,
4. (4)
   (4)A plain, speedy and efficient remedy may be had in the courts of such State.