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

The spill comes after a major rupture last month in Tennessee, when a dike released nearly a billion gallons of toxic-laden ash.

TVA spokesman John Moulton says the leak in the pond was discovered at about 6 a.m. at the plant near Stevenson, Ala. He said most of the material...