It seems they've gone and done it again. From the Knoxville News Sentinel:

STEVENSON, Ala. - The Tennessee Valley Authority says a waste pond at its Widows Creek power plant in northeast Alabama has ruptured but the spill is now contained.

TVA spokesman John Moulton said the leak in the pond was discovered at about 6 a.m. at the plant near Stevenson, Ala. He said most of the material from the leak flowed into a settling pond at the plant site but some spilled into Widows Creek.

The federal utility says the leak of what it described as gypsum has stopped and it is repairing the pond. It doesn't have an estimate on much material spilled and the cause of the failure is under investigation.

Details are still scarce, but we're trying to find folks on the ground in Stevenson to report what they see.  If you've got any first hand accounts, please drop us a line and let us know.