Filed Pursuant to Rule 433
Dated August 23, 2010
Registration Statement No. 333-159478
INTERSTATE POWER AND LIGHT COMPANY
Final Term Sheet
Dated August 23, 2010
| Issuer: | Interstate Power and Light Company | |
| Size: | $200,000,000 | |
| Security Type: | Senior Debentures | |
| Maturity Date: | September 1, 2020 | |
| Interest Payment Dates: | March 1 and September 1, commencing March 1, 2011 | |
| Coupon: | 3.650% | |
| Price to Public: | 99.925% | |
| Yield to Maturity: | 3.659% | |
| Benchmark Treasury: | 2.625% due August 15, 2020 | |
| Benchmark Treasury Yield: | 2.609% | |
| Spread to Benchmark Treasury: | + 105 bps | |
| Make-Whole Call: | Prior to June 1, 2020 at T + 20 bps | |
| Par Call: | On or after June 1, 2020 | |
| Trade Date: | August 23, 2010 | |
| Settlement Date: | August 26, 2010 (T+3) | |
| CUSIP: | 461070 AJ3 | |
| ISIN: | US461070AJ32 | |
| Underwriters: | Joint Book-Running Managers Banc of America Securities LLC Wells Fargo Securities, LLC
Co-Managers Mitsubishi UFJ Securities (USA), Inc. Commerz Markets LLC 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.
