. . "Wisconsin Power and Light Company" . . "1917" . "Alliant Energy Corp" . . . . . . . "1981" . "Interstate Power and Light Company" . . . . . . . . . . "5.99E9" . . . . . "1.8553E10" . . . . . . . . . . . . . "Wisconsin Power & Light" . . . "7.95E8" . "IES Utilities" . . "3375" . . . . . "Alliant Energy" . "3.669E9" . . . "6.74E8" . . . . "Alliant Energy Corporation" . "Alliant Energy" . . . "Wisconsin Power and Light" .