<PAGE>


                                                                      Exhibit 24



                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of James E. Rogers and Madeleine W. Ludlow, or either of them, the
undersigned's true and lawful attorney-in-fact and agent to execute for and on
behalf of the undersigned, in the undersigned's capacity as a director of
Cinergy Corp., the Form 10-K Annual Report of said corporation for the fiscal
year ended December 31, 1999, and to deliver said Form 10-K Annual Report so
signed for filing with the Securities and Exchange Commission.

         The undersigned does hereby ratify and confirm all that said
attorneys-in-fact and agents, or either of them, shall lawfully do by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto caused this Power of
Attorney to be executed on this 16th day of February, 2000.





                                                     /s/ Kenneth M. Duberstein
                                                     -------------------------
                                                     Kenneth M. Duberstein

<PAGE>

                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of James E. Rogers and Madeleine W. Ludlow, or either of them, the
undersigned's true and lawful attorney-in-fact and agent to execute for and on
behalf of the undersigned, in the undersigned's capacity as a director of each
of Cinergy Corp. and PSI Energy, Inc., the Form 10-K Annual Report of each
corporation for the fiscal year ended December 31, 1999, and to deliver said
Form 10-K Annual Reports so signed for filing with the Securities and Exchange
Commission.

         The undersigned does hereby ratify and confirm all that said
attorneys-in-fact and agents, or either of them, shall lawfully do by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto caused this Power of
Attorney to be executed on this 21st day of February, 2000.





                                                     /s/ John A. Hillenbrand II
                                                     ---------------------------
                                                     John A. Hillenbrand II

<PAGE>

                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of James E. Rogers and Madeleine W. Ludlow, or either of them, the
undersigned's true and lawful attorney-in-fact and agent to execute for and on
behalf of the undersigned, in the undersigned's capacity as a director of
Cinergy Corp., the Form 10-K Annual Report of said corporation for the fiscal
year ended December 31, 1999, and to deliver said Form 10-K Annual Report so
signed for filing with the Securities and Exchange Commission.

         The undersigned does hereby ratify and confirm all that said
attorneys-in-fact and agents, or either of them, shall lawfully do by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto caused this Power of
Attorney to be executed on this 16th day of February, 2000.





                                                     /s/ George C. Juilfs
                                                     ---------------------------
                                                     George C. Juilfs

<PAGE>

                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of James E. Rogers and Madeleine W. Ludlow, or either of them, the
undersigned's true and lawful attorney-in-fact and agent to execute for and on
behalf of the undersigned, in the undersigned's capacity as a director of
Cinergy Corp., the Form 10-K Annual Report of said corporation for the fiscal
year ended December 31, 1999, and to deliver said Form 10-K Annual Report so
signed for filing with the Securities and Exchange Commission.

         The undersigned does hereby ratify and confirm all that said
attorneys-in-fact and agents, or either of them, shall lawfully do by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto caused this Power of
Attorney to be executed on this 16th day of February, 2000.





                                                     /s/ Melvin Perelman
                                                     ---------------------------
                                                     Melvin Perelman

<PAGE>

                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of James E. Rogers and Madeleine W. Ludlow, or either of them, the
undersigned's true and lawful attorney-in-fact and agent to execute for and on
behalf of the undersigned, in the undersigned's capacity as a director of
Cinergy Corp., the Form 10-K Annual Report of said corporation for the fiscal
year ended December 31, 1999, and to deliver said Form 10-K Annual Report so
signed for filing with the Securities and Exchange Commission.

         The undersigned does hereby ratify and confirm all that said
attorneys-in-fact and agents, or either of them, shall lawfully do by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto caused this Power of
Attorney to be executed on this 16th day of February, 2000.





                                                     /s/ Thomas E. Petry
                                                     ---------------------------
                                                     Thomas E. Petry

<PAGE>

                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of James E. Rogers and Madeleine W. Ludlow, or either of them, the
undersigned's true and lawful attorney-in-fact and agent to execute for and on
behalf of the undersigned, in the undersigned's capacity as a director of each
of Cinergy Corp., The Cincinnati Gas & Electric Company, and PSI Energy, Inc.,
the Form 10-K Annual Report of each corporation for the fiscal year ended
December 31, 1999, and to deliver said Form 10-K Annual Reports so signed for
filing with the Securities and Exchange Commission.

         The undersigned does hereby ratify and confirm all that said
attorneys-in-fact and agents, or either of them, shall lawfully do by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto caused this Power of
Attorney to be executed on this 18th day of February, 2000.





                                                     /s/ Jackson H. Randolph
                                                     ---------------------------
                                                     Jackson H. Randolph

<PAGE>

                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of James E. Rogers and Madeleine W. Ludlow, or either of them, the
undersigned's true and lawful attorney-in-fact and agent to execute for and on
behalf of the undersigned, in the undersigned's capacity as a director of
Cinergy Corp., the Form 10-K Annual Report of said corporation for the fiscal
year ended December 31, 1999, and to deliver said Form 10-K Annual Report so
signed for filing with the Securities and Exchange Commission.

         The undersigned does hereby ratify and confirm all that said
attorneys-in-fact and agents, or either of them, shall lawfully do by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto caused this Power of
Attorney to be executed on this 16th day of February, 2000.





                                                     /s/ Mary L. Schapiro
                                                     ---------------------------
                                                     Mary L. Schapiro


<PAGE>


                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of James E. Rogers and Madeleine W. Ludlow, or either of them, the
undersigned's true and lawful attorney-in-fact and agent to execute for and on
behalf of the undersigned, in the undersigned's capacity as a director of
Cinergy Corp., the Form 10-K Annual Report of said corporation for the fiscal
year ended December 31, 1999, and to deliver said Form 10-K Annual Report so
signed for filing with the Securities and Exchange Commission.

         The undersigned does hereby ratify and confirm all that said
attorneys-in-fact and agents, or either of them, shall lawfully do by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto caused this Power of
Attorney to be executed on this 21st day of February, 2000.





                                                     /s/ John J. Schiff, Jr.
                                                     ---------------------------
                                                     John J. Schiff, Jr.

<PAGE>

                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of James E. Rogers and Madeleine W. Ludlow, or either of them, the
undersigned's true and lawful attorney-in-fact and agent to execute for and on
behalf of the undersigned, in the undersigned's capacity as a director of
Cinergy Corp., the Form 10-K Annual Report of said corporation for the fiscal
year ended December 31, 1999, and to deliver said Form 10-K Annual Report so
signed for filing with the Securities and Exchange Commission.

         The undersigned does hereby ratify and confirm all that said
attorneys-in-fact and agents, or either of them, shall lawfully do by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto caused this Power of
Attorney to be executed on this 18th day of February, 2000.





                                                     /s/ Dudley S. Taft
                                                     ---------------------------
                                                     Dudley S. Taft

<PAGE>

                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of James E. Rogers and Madeleine W. Ludlow, or either of them, the
undersigned's true and lawful attorney-in-fact and agent to execute for and on
behalf of the undersigned, in the undersigned's capacity as a director of each
of The Cincinnati Gas & Electric Company and The Union Light, Heat and Power
Company, the Form 10-K Annual Report of each corporation for the fiscal year
ended December 31, 1999, and to deliver said Form 10-K Annual Reports so signed
for filing with the Securities and Exchange Commission.

         The undersigned does hereby ratify and confirm all that said
attorneys-in-fact and agents, or either of them, shall lawfully do by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto caused this Power of
Attorney to be executed on this 17th day of February, 2000.





                                                     /s/ James L. Turner
                                                     ---------------------------
                                                     James L. Turner

<PAGE>

                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of James E. Rogers and Madeleine W. Ludlow, or either of them, the
undersigned's true and lawful attorney-in-fact and agent to execute for and on
behalf of the undersigned, in the undersigned's capacity as a director of
Cinergy Corp., the Form 10-K Annual Report of said corporation for the fiscal
year ended December 31, 1999, and to deliver said Form 10-K Annual Report so
signed for filing with the Securities and Exchange Commission.

         The undersigned does hereby ratify and confirm all that said
attorneys-in-fact and agents, or either of them, shall lawfully do by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto caused this Power of
Attorney to be executed on this 18th day of February, 2000.





                                                     /s/ Oliver W. Waddell
                                                     ---------------------------
                                                     Oliver W. Waddell

<PAGE>

                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of James E. Rogers and Madeleine W. Ludlow, or either of them, the
undersigned's true and lawful attorney-in-fact and agent to execute for and on
behalf of the undersigned, in the undersigned's capacity as a director of
Cinergy Corp., the Form 10-K Annual Report of said corporation for the fiscal
year ended December 31, 1999, and to deliver said Form 10-K Annual Report so
signed for filing with the Securities and Exchange Commission.

         The undersigned does hereby ratify and confirm all that said
attorneys-in-fact and agents, or either of them, shall lawfully do by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto caused this Power of
Attorney to be executed on this 17th day of February, 2000.





                                                     /s/ Neil A. Armstrong
                                                     ---------------------------
                                                     Neil A. Armstrong

<PAGE>

                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of James E. Rogers and Madeleine W. Ludlow, or either of them, the
undersigned's true and lawful attorney-in-fact and agent to execute for and on
behalf of the undersigned, in the undersigned's capacity as a director of each
of Cinergy Corp. and PSI Energy, Inc., the Form 10-K Annual Report of each
corporation for the fiscal year ended December 31, 1999, and to deliver said
Form 10-K Annual Reports so signed for filing with the Securities and Exchange
Commission.

         The undersigned does hereby ratify and confirm all that said
attorneys-in-fact and agents, or either of them, shall lawfully do by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto caused this Power of
Attorney to be executed on this 16th day of February, 2000.





                                                     /s/ James K. Baker
                                                     ---------------------------
                                                     James K. Baker

<PAGE>

                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of James E. Rogers and Madeleine W. Ludlow, or either of them, the
undersigned's true and lawful attorney-in-fact and agent to execute for and on
behalf of the undersigned, in the undersigned's capacity as a director of each
of Cinergy Corp. and PSI Energy, Inc., the Form 10-K Annual Report of each
corporation for the fiscal year ended December 31, 1999, and to deliver said
Form 10-K Annual Reports so signed for filing with the Securities and Exchange
Commission.

         The undersigned does hereby ratify and confirm all that said
attorneys-in-fact and agents, or either of them, shall lawfully do by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto caused this Power of
Attorney to be executed on this 21st day of February, 2000.





                                                     /s/ Michael G. Browning
                                                     ---------------------------
                                                     Michael G. Browning

<PAGE>

                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of James E. Rogers and Madeleine W. Ludlow, or either of them, the
undersigned's true and lawful attorney-in-fact and agent to execute for and on
behalf of the undersigned, in the undersigned's capacity as a director of
Cinergy Corp., the Form 10-K Annual Report of said corporation for the fiscal
year ended December 31, 1999, and to deliver said Form 10-K Annual Report so
signed for filing with the Securities and Exchange Commission.

         The undersigned does hereby ratify and confirm all that said
attorneys-in-fact and agents, or either of them, shall lawfully do by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto caused this Power of
Attorney to be executed on this 17th day of February, 2000.





                                                     /s/ Phillip R. Cox
                                                     ---------------------------
                                                     Phillip R. Cox

<PAGE>

                                POWER OF ATTORNEY


         KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of James E. Rogers and Madeleine W. Ludlow, or either of them, the
undersigned's true and lawful attorney-in-fact and agent to execute for and on
behalf of the undersigned, in the undersigned's capacity as a director of
Cinergy Corp., the Form 10-K Annual Report of said corporation for the fiscal
year ended December 31, 1999, and to deliver said Form 10-K Annual Report so
signed for filing with the Securities and Exchange Commission.

         The undersigned does hereby ratify and confirm all that said
attorneys-in-fact and agents, or either of them, shall lawfully do by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has hereunto caused this Power of
Attorney to be executed on this 18th day of February, 2000.





                                                     /s/ Philip R. Sharp
                                                     -------------------
                                                     Philip R. Sharp

                                                                     Exhibit 24