A major test case is underway in Ohio, where a utility company is trying to undo deregulation in an attempt to keep expensive and aging coal and nuclear plants online. A major test case is underway in Ohio, where a utility company is trying to undo deregulation in an attempt to keep expensive and aging coal and nuclear plants online. A major test case is underway in Ohio, where a utility company is trying to undo deregulation in an attempt to keep expensive and aging coal and nuclear plants online. A major test case is underway in Ohio, where a utility company is trying to undo deregulation in an attempt to keep expensive and aging coal and nuclear plants online.