Despite calling for Southwestern Electric Power Co. to halt construction at the coal-fired John W. Turk Jr. power plant, opponents of the $2.1 billion project say it is unlikely they will seek a court action.

Last week, the Arkansas Court of Appeals unanimously reversed the Arkansas Public Service Commission’s approval of the plant, where work has proceeded for more than a year toward its scheduled 2012 startup.

The Sierra Club has since asked SWEPCO to “immediately cease” construction. Meanwhile, nearby hunting clubs and landowners—whom SWEPCO accused of trying to cont...

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