Stymied by state regulators, a renewable energy company seeking to build one of the nation's longest power lines across a large swath of the Midwest has turned to a prominent politician in an attempt to revive its $2.3 billion project.

Former Missouri Gov. Jay Nixon, now working as a private attorney after recently finishing 30 years in public office, is to argue Tuesday to the Missouri Supreme Court that utility regulators he appointed wrongly rejected the power line while relying on an incorrect court ruling written by a judge whom Nixon also appointed.

Should Nixon prevail in court, it could help clear a path for Houston-based Clean Line Energy Partners LLC to build a 780-mile (1,255-kilometer), high-voltage transmission line from the wind farms of western Kansas across Missouri and Illinois to Indiana, where it would feed into a power grid serving eastern states. Missouri had been the lone state blocking the project, until an Illinois appeals court in March also overturned that state's approval.