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: U-6B-2/A SEC ACT: SEC FILE NUMBER: 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 SECURITIES AND EXCHANGE COMMISSION Washington D. C. 20549 FORM U-6B-2/A Certificate of Notification ALLIANT ENERGY CORPORATION This certificate is notice that Alliant Energy Corporation ("AEC"), during the period from December 1, 2001 through December 31, 2001, has issued, renewed or guaranteed the security or securities described herein, which issue, renewal or guaranty was exempted from the provisions of Section 6(a) of the Act and was neither the subject of a declaration or application on Form U-1 nor included within the exemption provided by Rule U-48 [Reg. Section 250.48 Paragraph 36,621]. 1. Type of the security - Commercial paper notes issued by Alliant Energy Corporation. 2. Issue, renewal or guaranty - New Issues 3. Principal amount - See Schedule 1 4. Rate of interest - See Schedule 1 5. Date of issue, renewal or guaranty - From December 1, 2001 through December 31, 2001 6. If renewal of security, give date of original issue - Not Applicable 7. Date of maturity of each security - various ranging from 1 day to 100 days. 8. Name of the person to whom each security was issued, renewed or guarantied: Cede & Co. 9. Collateral given with each security: None 10. Consideration received for each security: See Schedule 1 11. Application of proceeds of each security: See Schedule 1 12. Indicate by a check after the applicable statement below whether the issue, renewal or guaranty of each security was exempt from the provisions of Section 6(a) because of a. the provisions contained in the first sentence of 6(b), : X b. the provisions contained in the fourth sentence of 6(b), : c. the provisions contained in any rule of the commission other than Rule U-48, : 13. See Schedule 2. 14. Not Applicable 15 Not Applicable. ALLIANT ENERGY CORPORATION Date: February 11, 2002 By: ------------------- ------------------------------------------ Enrique Bacalao, Assistant Treasurer Alliant Energy Corporation Form U-6B-2/A Schedule 1 ---------- PERIOD FROM DECEMBER 1, 2001 THROUGH DECEMBER 31, 2001 1. During the period from December 1, 2001 through December 31, 2001, Alliant Energy Corporation issued commercial paper to fund borrowings by participants in the Utility Money Pool and for other business purposes as follows: December -------- Beginning Balance $ 55,874,000 CP Issued $ 176,748,000 CP Matured $ 164,233,000 Ending Balance $ 68,389,000 Max Daily Balance $ 68,389,000 2. The weighted average interest rate for the period was 2.84%. Alliant Energy Corporation Form U-6B-2/A Schedule 2 ---------- Calculation under item 13 Form U-6B-2/A: Principal amount of securities for which Alliant Energy Corporation is primarily or secondarily liable and fair market value of equity securities for the Reporting Period: Alliant Energy Corporation Senior Notes $ 24,000,000 Guaranteed Long-term debt of AER 1,105,791,000 Alliant Energy Corporation Common Stock 2,309,451,000 ------------------- Total $ 3,439,242,000 5% ------------------- 5% of Total $ 171,962,000 =============