Led by the Utah chapter of the Sierra Club, the groups want the Utah Division of Air Quality to deny a request by the plant's owners to extend their permit for a second time.

The groups making the request included the Utah Chapter of the Sierra Club, Western Resource Advocates, National Parks and Conservation Association, Sevier Citizens for Clean Air and Water, Utah Physicians for a Healthy Environment, Utah League of Women Voters, Post Carbon Salt Lake and Utah Valley Sierra Forum.

Plans for the plant have been on hold for more than three years because of internal struggles among the plants owners and operators and because of environmental-group appeals. But some of the owners, including the Utah Associated Municipal Power Systems and Pacificorp, have gone to court to keep the project alive. - Judy Fahys