CASTLE GATE, Carbon County — One of Utah's most prominent industrial landmarks may be on the verge of a permanent shutdown, done in by its own scenic setting. Rocky Mountain Power has warned employees and public officials to expect the likely closure of the company's Carbon Power Plant in the next two to three years. "It's probable," company spokesman Dave Eskelsen said Monday. "I think people need to be prepared for that." ... A cleanup deadline is looming in the year 2015 for reductions in emissions of mercury, nitrogen-oxides, sulfur-dioxide and particles of ash. "There's simply not enough room in...