Opponents of the plant say the law cannot be applied retroactively to a case that began before the law was passed.
Act 910 of 2011 states that the Arkansas Public Service Commission is the "exclusive forum with primary and final jurisdiction" for the resolution of "all matters concerning the location, financing, construction and operation of a major utility facility.
The law also states that a court in Arkansas does not have jurisdiction to hear any issue "that was or could have been determined in a proceeding... before the Arkansas Public Service Commission."
In a filing submitted to the Arkansas Supreme Court, SWEPCO said the Hempstead County Hunting Club's lawsuit seeking to stop construction of a $2-billion, 600-megawatt plant in Hempstead County contains state claims that were not exhausted before the Public Service Commission.
Act 910 "clarifies that administrative remedies before the Arkansas Public Service Commission must be exhausted before courts of this state may assert jurisdiction over matters that are within the primary jurisdiction of the APSC," SWEPCO said in the filing.
The hunting club claims that construction of the plant was not properly approved by the U.S. Army Corps of Engineers and that the plant would harm the local environment.
The club's lawsuit is pending in federal court, but the federal judge hearing the case has asked the state Supreme Court to answer three questions about state law, the first being whether state-law claims that were not heard by the PSC can proceed in federal court.
In light of Act 910, SWEPCO said it has asked the federal court to withdraw the questions and dismiss all state-law claims in the lawsuit.