(a) The validity of any rule, waiver, or variance may be determined in an action for declaratory judgment when it is alleged that the rule, waiver, or variance or its threatened application interferes with or impairs the legal rights of the petitioner. A declaratory judgment may be rendered whether or not the petitioner has first requested the agency to pass upon the validity of the rule, waiver, or variance in question.

(b) The agency shall be made a party to the action and a copy of the petition shall be served on the Attorney General. The action shall be brought in the Superior Court of Fulton County or in the superior court of the county of residence of the petitioner. When the petitioner is a corporation, the action may be brought in the Superior Court of Fulton County or in the superior court of the county where the petitioner maintains its principal place of doing business in this state. All actions for declaratory judgment, however, with respect to any rule, waiver, or variance of the Public Service Commission must be brought in the Superior Court of Fulton County.

(c) Actions for declaratory judgment provided for in this Code section shall be in accordance with Chapter 4 of Title 9, relating to declaratory judgments.