In this Monday, Dec. 29, 2008 file image provided by Greenpeace, coal ash slurry left behind in a containment pond near the Tennessee Valley Authority's Kingston Fossil Plant is shown in Harriman, Tenn., after the dyke at left broke Dec. 22, 2008. The Obama administration is under court order to unveil the rule Friday, Dec. 19, 2014 ending a six-year effort that began after the massive spill at the Tennessee power plant in 2008.