POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, That I Alan B. Arends hereby constitute and appoint Erroll B. Davis, Jr. and Edward M. Gleason, and each of them individually, my true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for me and in my name, place and stead, in any and all capacities, to sign my name as a director of Alliant Energy Resources, Inc. (the "Company") and Alliant Energy Corporation (the "Parent") to the Registration Statement on Form S-3, and any amendments (including post-effective amendments) or supplements thereto, relating to the resale of up to 5,940,960 unsecured exchangeable senior notes in an original aggregate principal amount of $402,500,040 issued by the Company and unconditionally guaranteed by the Parent, and to file said Registration Statement, and any amendment (including any post-effective amendment) or supplement thereto, with the Securities and Exchange Commission in connection with the registration of the resale of the unsecured exchangeable senior notes and related guarantees under the Securities Act of 1933, as amended. I hereby ratify and confirm all that said attorneys-in-fact and agents, or each of them, have done or shall lawfully do by virtue of this Power of Attorney. WITNESS my hand this 20th day of July, 2001. /s/ Alan B. Arends -------------------------------------- Alan B. Arends POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, That I Jack B. Evans hereby constitute and appoint Erroll B. Davis, Jr. and Edward M. Gleason, and each of them individually, my true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for me and in my name, place and stead, in any and all capacities, to sign my name as a director of Alliant Energy Resources, Inc. (the "Company") and Alliant Energy Corporation (the "Parent") to the Registration Statement on Form S-3, and any amendments (including post-effective amendments) or supplements thereto, relating to the resale of up to 5,940,960 unsecured exchangeable senior notes in an original aggregate principal amount of $402,500,040 issued by the Company and unconditionally guaranteed by the Parent, and to file said Registration Statement, and any amendment (including any post-effective amendment) or supplement thereto, with the Securities and Exchange Commission in connection with the registration of the resale of the unsecured exchangeable senior notes and related guarantees under the Securities Act of 1933, as amended. I hereby ratify and confirm all that said attorneys-in-fact and agents, or each of them, have done or shall lawfully do by virtue of this Power of Attorney. WITNESS my hand this 20th day of July, 2001. /s/ Jack B. Evans -------------------------------------- Jack B. Evans POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, That I Joyce L. Hanes hereby constitute and appoint Erroll B. Davis, Jr. and Edward M. Gleason, and each of them individually, my true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for me and in my name, place and stead, in any and all capacities, to sign my name as a director of Alliant Energy Resources, Inc. (the "Company") and Alliant Energy Corporation (the "Parent") to the Registration Statement on Form S-3, and any amendments (including post-effective amendments) or supplements thereto, relating to the resale of up to 5,940,960 unsecured exchangeable senior notes in an original aggregate principal amount of $402,500,040 issued by the Company and unconditionally guaranteed by the Parent, and to file said Registration Statement, and any amendment (including any post-effective amendment) or supplement thereto, with the Securities and Exchange Commission in connection with the registration of the resale of the unsecured exchangeable senior notes and related guarantees under the Securities Act of 1933, as amended. I hereby ratify and confirm all that said attorneys-in-fact and agents, or each of them, have done or shall lawfully do by virtue of this Power of Attorney. WITNESS my hand this 20th day of July, 2001. /s/ Joyce L. Hanes -------------------------------------- Joyce L. Hanes POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, That I Lee Liu hereby constitute and appoint Erroll B. Davis, Jr. and Edward M. Gleason, and each of them individually, my true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for me and in my name, place and stead, in any and all capacities, to sign my name as a director of Alliant Energy Resources, Inc. (the "Company") and Alliant Energy Corporation (the "Parent") to the Registration Statement on Form S-3, and any amendments (including post-effective amendments) or supplements thereto, relating to the resale of up to 5,940,960 unsecured exchangeable senior notes in an original aggregate principal amount of $402,500,040 issued by the Company and unconditionally guaranteed by the Parent, and to file said Registration Statement, and any amendment (including any post-effective amendment) or supplement thereto, with the Securities and Exchange Commission in connection with the registration of the resale of the unsecured exchangeable senior notes and related guarantees under the Securities Act of 1933, as amended. I hereby ratify and confirm all that said attorneys-in-fact and agents, or each of them, have done or shall lawfully do by virtue of this Power of Attorney. WITNESS my hand this 20th day of July, 2001. /s/ Lee Liu -------------------------------------- Lee Liu POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, That I Katharine C. Lyall hereby constitute and appoint Erroll B. Davis, Jr. and Edward M. Gleason, and each of them individually, my true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for me and in my name, place and stead, in any and all capacities, to sign my name as a director of Alliant Energy Resources, Inc. (the "Company") and Alliant Energy Corporation (the "Parent") to the Registration Statement on Form S-3, and any amendments (including post-effective amendments) or supplements thereto, relating to the resale of up to 5,940,960 unsecured exchangeable senior notes in an original aggregate principal amount of $402,500,040 issued by the Company and unconditionally guaranteed by the Parent, and to file said Registration Statement, and any amendment (including any post-effective amendment) or supplement thereto, with the Securities and Exchange Commission in connection with the registration of the resale of the unsecured exchangeable senior notes and related guarantees under the Securities Act of 1933, as amended. I hereby ratify and confirm all that said attorneys-in-fact and agents, or each of them, have done or shall lawfully do by virtue of this Power of Attorney. WITNESS my hand this 20th day of July, 2001. /s/ Katharine C. Lyall -------------------------------------- Katharine C. Lyall POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, That I Judith D. Pyle hereby constitute and appoint Erroll B. Davis, Jr. and Edward M. Gleason, and each of them individually, my true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for me and in my name, place and stead, in any and all capacities, to sign my name as a director of Alliant Energy Resources, Inc. (the "Company") and Alliant Energy Corporation (the "Parent") to the Registration Statement on Form S-3, and any amendments (including post-effective amendments) or supplements thereto, relating to the resale of up to 5,940,960 unsecured exchangeable senior notes in an original aggregate principal amount of $402,500,040 issued by the Company and unconditionally guaranteed by the Parent, and to file said Registration Statement, and any amendment (including any post-effective amendment) or supplement thereto, with the Securities and Exchange Commission in connection with the registration of the resale of the unsecured exchangeable senior notes and related guarantees under the Securities Act of 1933, as amended. I hereby ratify and confirm all that said attorneys-in-fact and agents, or each of them, have done or shall lawfully do by virtue of this Power of Attorney. WITNESS my hand this 20th day of July, 2001. /s/ Judith D. Pyle -------------------------------------- Judith D. Pyle POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, That I Robert W. Schlutz hereby constitute and appoint Erroll B. Davis, Jr. and Edward M. Gleason, and each of them individually, my true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for me and in my name, place and stead, in any and all capacities, to sign my name as a director of Alliant Energy Resources, Inc. (the "Company") and Alliant Energy Corporation (the "Parent") to the Registration Statement on Form S-3, and any amendments (including post-effective amendments) or supplements thereto, relating to the resale of up to 5,940,960 unsecured exchangeable senior notes in an original aggregate principal amount of $402,500,040 issued by the Company and unconditionally guaranteed by the Parent, and to file said Registration Statement, and any amendment (including any post-effective amendment) or supplement thereto, with the Securities and Exchange Commission in connection with the registration of the resale of the unsecured exchangeable senior notes and related guarantees under the Securities Act of 1933, as amended. I hereby ratify and confirm all that said attorneys-in-fact and agents, or each of them, have done or shall lawfully do by virtue of this Power of Attorney. WITNESS my hand this 20th day of July, 2001. /s/ Robert W. Schlutz -------------------------------------- Robert W. Schlutz POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, That I Wayne H. Stoppelmoor hereby constitute and appoint Erroll B. Davis, Jr. and Edward M. Gleason, and each of them individually, my true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for me and in my name, place and stead, in any and all capacities, to sign my name as a director of Alliant Energy Resources, Inc. (the "Company") and Alliant Energy Corporation (the "Parent") to the Registration Statement on Form S-3, and any amendments (including post-effective amendments) or supplements thereto, relating to the resale of up to 5,940,960 unsecured exchangeable senior notes in an original aggregate principal amount of $402,500,040 issued by the Company and unconditionally guaranteed by the Parent, and to file said Registration Statement, and any amendment (including any post-effective amendment) or supplement thereto, with the Securities and Exchange Commission in connection with the registration of the resale of the unsecured exchangeable senior notes and related guarantees under the Securities Act of 1933, as amended. I hereby ratify and confirm all that said attorneys-in-fact and agents, or each of them, have done or shall lawfully do by virtue of this Power of Attorney. WITNESS my hand this 20th day of July, 2001. /s/ Wayne H. Stoppelmoor -------------------------------------- Wayne H. Stoppelmoor POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, That I Anthony R. Weiler hereby constitute and appoint Erroll B. Davis, Jr. and Edward M. Gleason, and each of them individually, my true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for me and in my name, place and stead, in any and all capacities, to sign my name as a director of Alliant Energy Resources, Inc. (the "Company") and Alliant Energy Corporation (the "Parent") to the Registration Statement on Form S-3, and any amendments (including post-effective amendments) or supplements thereto, relating to the resale of up to 5,940,960 unsecured exchangeable senior notes in an original aggregate principal amount of $402,500,040 issued by the Company and unconditionally guaranteed by the Parent, and to file said Registration Statement, and any amendment (including any post-effective amendment) or supplement thereto, with the Securities and Exchange Commission in connection with the registration of the resale of the unsecured exchangeable senior notes and related guarantees under the Securities Act of 1933, as amended. I hereby ratify and confirm all that said attorneys-in-fact and agents, or each of them, have done or shall lawfully do by virtue of this Power of Attorney. WITNESS my hand this 20th day of July, 2001. /s/ Anthony R. Weiler -------------------------------------- Anthony R. Weiler