FILER: COMPANY DATA: COMPANY CONFORMED NAME: ALLIANT ENERGY CORPORATION CENTRAL INDEX KEY: STANDARD INDUSTRIAL CLASSIFICATION: ELECTRIC AND OTHER SERVICES COMB. [4931] IRS NUMBER: 391380265 STATE OF INCORPORATION: WI FISCAL YEAR END: 12/31 FILING VALUES: FORM TYPE: 35-CERT SEC ACT: SEC FILE NUMBER: 070-9317 FILM NUMBER: BUSINESS ADDRESS: STREET 1: 222 WEST WASHINGTON AVENUE CITY: MADISON STATE: WI ZIP: 53703 BUSINESS PHONE: 608-252-3311 MAILING ADDRESS STREET 1: P. O. BOX 192 CITY: MADISON STATE: WI ZIP: 53701-0192 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D. C. 20549 PUBLIC UTILITY HOLDING COMPANY ACT OF 1935 File No. 70-9317 REPORT PERIOD October 1, 2001 through December 31, 2001 In the Matter of ALLIANT ENERGY CORPORATION, ET AL ALLIANT ENERGY CORPORATION ("AEC") hereby certifies on behalf of itself and IES Utilities Inc. ("IESU"), Interstate Power Company ("IPC"), and Alliant Energy Corporate Services, Inc. ("Services") that during the period from October 1, 2001 through December 31, 2001 (the "Reporting Period"): 1. For each of the companies participating in the Utility Money Pool during the Reporting Period, the maximum principal amount of short-term borrowings outstanding from the Utility Money Pool, sources other than the Utility Money Pool, and the maximum total short-term borrowings outstanding during the Reporting Period, and the Securities and Exchange Commission ("SEC") borrowing limit for each participant as of the end of the Reporting Period were as follows: Maximum Maximum Other Maximum Money Pool Short-Term Total SEC Company Borrowings Borrowings Borrowings Limit IESU 60,136,564 0.00 60,136,564 150,000,000 IPC 40,405,615 0.00 40,405,615 100,000,000 WP&L (*) 101,351,392 0.00 101,351,392 NA SERVICES (*) 69,987,795 0.00 69,987,795 NA (*) All borrowings by WP&L and Services from the Utility Money Pool are exempt under Rule 52 and are shown here for information purposes only. 2. During the Reporting Period, the weighted average interest rate for borrowings through the Utility Money Pool was 2.67%. 3. During the period October 1, 2001 through November 30, 2001, the maximum amount of short-term borrowings by AEC was $284,617,000 and the weighted average interest rate was 2.90%. The maximum amount of loans by AEC to the Utility Money Pool was $174,011,850. 4. During the period December 1, 2001 through December 31, 2001, AEC relied upon the exemption afforded by Section 6(b) of the Act to issue short-term debt. AEC is reporting such activity separately on Form U-6B-2. Said transactions have been carried out in accordance with the terms and conditions of, and for the purpose represented in, the Form U-1 Application-Declaration, as amended, of AEC, et al, in File 70-9317, and in accordance with the terms and conditions of the SEC's orders dated December 18,1998 and December 15, 2000, permitting said Application-Declaration to become effective. DATED: February 11, 2002 ALLIANT ENERGY CORPORATION INTERSTATE POWER AND LIGHT COMPANY (As successor to IES Utilities Inc. and Interstate Power Company) WISCONSIN POWER AND LIGHT COMPANY ALLIANT ENERGY CORPORATE SERVICES INC. BY: ____________________________________ Edward M. Gleason Vice President, Treasurer and Corporate Secretary