Filed Pursuant To Rule 433

Dated July 7, 2009

Registration Statement No. 333-159477

WISCONSIN POWER AND LIGHT COMPANY

Final Term Sheet

Dated July 7, 2009

Issuer:	Wisconsin Power and Light Company
Size:	$250,000,000
Security Type:	Debentures
Maturity Date:	July 15, 2019
Interest Payment Dates:	January 15 and July 15, commencing January 15, 2010
Coupon:	5.00%
Price to Public	99.385%
Yield to Maturity:	5.079%
Benchmark Treasury:	3.125% due May 15, 2019
Benchmark Treasury Yield:	3.479%
Spread to Benchmark Treasury:	+ 160 bps
Optional Redemption—Reinvestment Rate:	Make-whole call at T + 25 bps
Trade Date:	July 7, 2009
Settlement Date:	July 10, 2009 (T+3)
CUSIP:	976826 BG1
ISIN:	US976826BG12
Underwriters:	Joint Book-Running Managers Banc of America Securities LLC Wells Fargo Securities, LLC BNY Mellon Capital Markets, LLC UBS Securities LLC Co-Managers Commerzbank Capital Markets Corp. Mizuho Securities USA Inc.

The issuer has filed a registration statement (including a prospectus) with the SEC for the offering to which this communication relates. Before you invest, you should read the prospectus in that registration statement and other documents that the issuer has filed with the SEC for more complete information about the issuer and this offering. You may get these documents for free by visiting EDGAR on the SEC Web site at www.sec.gov. Alternatively, you may request a copy of these documents from Banc of America Securities LLC by calling 1-800-294-1322 or from Wells Fargo Securities, LLC by calling 1-800-326-5897.