<PAGE>   1
                                                                    EXHIBIT 24-1

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned Director or Officer of MCN Energy Group Inc., a
Michigan corporation, does hereby constitute and appoint, Daniel L. Schiffer and
Gerard F. Kabzinski, and each of them, his true and lawful attorneys and agents,
each with full power and authority (acting alone and without the other) to
execute in his name and on his behalf and to file with the Securities and
Exchange Commission an Annual Report on Form 10-K for the year ended December
31, 1999, including all amendments.

     IN WITNESS WHEREOF, I have executed this Power of Attorney this 23rd day of
February, 2000.



                                             /s/ Alfred R. Glancy III
                                             -----------------------------------
                                                 Alfred R. Glancy III


<PAGE>   2




                                                                    EXHIBIT 24-1

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned Director or Officer of MCN Energy Group Inc., a
Michigan corporation, does hereby constitute and appoint, Alfred R. Glancy III,
Daniel L. Schiffer and Gerard F. Kabzinski, and each of them, his true and
lawful attorneys and agents, each with full power and authority (acting alone
and without the others) to execute in his name and on his behalf and to file
with the Securities and Exchange Commission an Annual Report on Form 10-K for
the year ended December 31, 1999, including all amendments.

     IN WITNESS WHEREOF, I have executed this Power of Attorney this 23rd day of
February, 2000.




                                             /s/ Stephen E. Ewing
                                             -----------------------------------
                                                 Stephen E. Ewing



<PAGE>   3




                                                                    EXHIBIT 24-1

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned Director or Officer of MCN Energy Group Inc., a
Michigan corporation, does hereby constitute and appoint, Alfred R. Glancy III
and Daniel L. Schiffer, and each of them, his true and lawful attorneys and
agents, each with full power and authority (acting alone and without the other)
to execute in his name and on his behalf and to file with the Securities and
Exchange Commission an Annual Report on Form 10-K for the year ended December
31, 1999, including all amendments.

     IN WITNESS WHEREOF, I have executed this Power of Attorney this 23rd day of
February, 2000.








                                             /s/ Gerard F. Kabzinski
                                             -----------------------------------
                                                 Gerard F. Kabzinski




<PAGE>   4




                                                                    EXHIBIT 24-1

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned Director or Officer of MCN Energy Group Inc., a
Michigan corporation, does hereby constitute and appoint, Alfred R. Glancy III,
Daniel L. Schiffer and Gerard F. Kabzinski, and each of them, his true and
lawful attorneys and agents, each with full power and authority (acting alone
and without the others) to execute in his name and on his behalf and to file
with the Securities and Exchange Commission an Annual Report on Form 10-K for
the year ended December 31, 1999, including all amendments.

     IN WITNESS WHEREOF, I have executed this Power of Attorney this 23rd day of
February, 2000.



                                             /s/ James G. Berges
                                             -----------------------------------
                                                 James G. Berges


<PAGE>   5




                                                                    EXHIBIT 24-1

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned Director or Officer of MCN Energy Group Inc., a
Michigan corporation, does hereby constitute and appoint, Alfred R. Glancy III,
Daniel L. Schiffer and Gerard F. Kabzinski, and each of them, his true and
lawful attorneys and agents, each with full power and authority (acting alone
and without the others) to execute in his name and on his behalf and to file
with the Securities and Exchange Commission an Annual Report on Form 10-K for
the year ended December 31, 1999, including all amendments.

     IN WITNESS WHEREOF, I have executed this Power of Attorney this 23rd day of
February, 2000.


                                             /s/ Frank M. Hennessey
                                             -----------------------------------
                                                 Frank M. Hennessey


<PAGE>   6




                                                                    EXHIBIT 24-1

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned Director or Officer of MCN Energy Group Inc., a
Michigan corporation, does hereby constitute and appoint, Alfred R. Glancy III,
Daniel L. Schiffer and Gerard F. Kabzinski, and each of them, his true and
lawful attorneys and agents, each with full power and authority (acting alone
and without the others) to execute in his name and on his behalf and to file
with the Securities and Exchange Commission an Annual Report on Form 10-K for
the year ended December 31, 1999, including all amendments.

     IN WITNESS WHEREOF, I have executed this Power of Attorney this 23rd day of
February, 2000.




                                             /s/ Thomas H. Jeffs II
                                             -----------------------------------
                                                 Thomas H. Jeffs II


<PAGE>   7




                                                                    EXHIBIT 24-1

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned Director or Officer of MCN Energy Group Inc., a
Michigan corporation, does hereby constitute and appoint, Alfred R. Glancy III,
Daniel L. Schiffer and Gerard F. Kabzinski, and each of them, her true and
lawful attorneys and agents, each with full power and authority (acting alone
and without the others) to execute in her name and on her behalf and to file
with the Securities and Exchange Commission an Annual Report on Form 10-K for
the year ended December 31, 1999, including all amendments.

     IN WITNESS WHEREOF, I have executed this Power of Attorney this 23rd day of
February, 2000.



                                             /s/ Helen O. Petrauskas
                                             -----------------------------------
                                                 Helen O. Petrauskas



<PAGE>   8




                                                                    EXHIBIT 24-1

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned Director or Officer of MCN Energy Group Inc., a
Michigan corporation, does hereby constitute and appoint, Alfred R. Glancy III,
Daniel L. Schiffer and Gerard F. Kabzinski, and each of them, his true and
lawful attorneys and agents, each with full power and authority (acting alone
and without the others) to execute in his name and on his behalf and to file
with the Securities and Exchange Commission an Annual Report on Form 10-K for
the year ended December 31, 1999, including all amendments.

     IN WITNESS WHEREOF, I have executed this Power of Attorney this 23rd day of
February, 2000.



                                             /s/ Howard F. Sims
                                             -----------------------------------
                                                 Howard F. Sims


<PAGE>   9




                                                                    EXHIBIT 24-1

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned Director or Officer of MCN Energy Group Inc., a
Michigan corporation, does hereby constitute and appoint, Alfred R. Glancy III,
Daniel L. Schiffer and Gerard F. Kabzinski, and each of them, his true and
lawful attorneys and agents, each with full power and authority (acting alone
and without the others) to execute in his name and on his behalf and to file
with the Securities and Exchange Commission an Annual Report on Form 10-K for
the year ended December 31, 1999, including all amendments.

     IN WITNESS WHEREOF, I have executed this Power of Attorney this 23rd day of
February, 2000.



                                             /s/ Bill M. Thompson
                                             -----------------------------------
                                                 Bill M. Thompson


<PAGE>   10




                                                                    EXHIBIT 24-1

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned Director or Officer of MCN Energy Group Inc., a
Michigan corporation, does hereby constitute and appoint, Daniel L. Schiffer and
Gerard F. Kabzinski, and each of them, his true and lawful attorneys and agents,
each with full power and authority (acting alone and without the other) to
execute in his name and on his behalf and to file with the Securities and
Exchange Commission an Annual Report on Form 10-K for the year ended December
31, 1999, including all amendments.

     IN WITNESS WHEREOF, I have executed this Power of Attorney this 23rd day of
February, 2000.



                                             /s/ Howard L. Dow III
                                             -----------------------------------
                                                 Howard L. Dow III


<PAGE>   11




                                                                    EXHIBIT 24-1

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

     That the undersigned Director or Officer of MCN Energy Group Inc., a
Michigan corporation, does hereby constitute and appoint, Alfred R. Glancy III,
Daniel L. Schiffer and Gerard F. Kabzinski, and each of them, his true and
lawful attorneys and agents, each with full power and authority (acting alone
and without the others) to execute in his name and on his behalf and to file
with the Securities and Exchange Commission an Annual Report on Form 10-K for
the year ended December 31, 1999, including all amendments.

     IN WITNESS WHEREOF, I have executed this Power of Attorney this 23rd day of
February, 2000.


                                                 /s/ Roger Fridholm
                                             -----------------------------------
                                                     Roger Fridholm