Company:  WISCONSIN POWER & LIGHT C ...
Form Type:  SC 13G/A
Filing Date:  4/10/2012 
CIK:  0000107832 
Address:  4902 NORTH BILTMORE LANE
SUITE 1000 
City, State, Zip:  MADISON, Wisconsin 53718-2148 
Telephone:  608-458-3311 
Fiscal Year:  12/31 
Description of Business
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  FORM SC 13G/A
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