Filed Pursuant To Rule 433
Dated August 8, 2007
Registration Statement No. 333-143831

WISCONSIN POWER AND LIGHT COMPANY

Final Term Sheet
Dated August 8, 2007

Issuer:	Wisconsin Power and Light Company
Size:	$300,000,000
Security Type:	Debenture
Maturity Date:	August 15, 2037
Coupon:	6.375%
Price to Public	99.431%
Yield to Maturity:	6.418%
Benchmark Treasury:	4.50% due February 15, 2036
Benchmark Treasury Yield:	5.043%
Spread to Benchmark Treasury:	137.5 bps
Optional Redemption — Reinvestment Rate:	25 bps
Trade Date:	August 8, 2007
Settlement Date:	August 15, 2007 (T+5)
CUSIP:	976826 BE6
Underwriters:	Joint Book-Running Managers
	Banc of America Securities LLC
	Merrill Lynch, Pierce, Fenner & Smith Incorporated
	Co-Managers
	Citigroup Global Markets Inc.
	KeyBanc Capital Markets 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 emailing dg.prospectus_distribution@bofasecurities.com or from Merrill Lynch & Co. by calling 1-866-500-5408.