(Al Hartmann | The Salt Lake Tribune via AP) In this Sept. 8, 2015, file photo, a natural gas rig pumps away in the foreground of the coal-fired Huntington Power Plant west of Huntington, Utah. A 20-year plan by Utah's largest electricity provider stipulating that it will not add pollution-control systems to its coal power plants has received criticism from some in the state who say it means continued regional haze, including around national parks. The federal Environmental Protection Agency now says expensive new pollution controls are not needed.