Exhibit 24

POWER OF ATTORNEY

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

Know all men by these presents, that I, James Balog, a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, a Colorado corporation, do hereby constitute and appoint each of R.G. Schultz and J.H. Van Harmelen as my true and lawful attorney and agent for me and in my name and on my behalf to, individually and without the concurrence of the other attorney and agent, sign my name, in my capacity as a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, on Form 10-K Annual Reports of Great-West Life & Annuity Insurance Company to be filed with the Securities and Exchange Commission from time to time, and to any and all amendments thereto.

I hereby revoke any prior Power of Attorney given for the purpose of signing my name on Great-West Life & Annuity Insurance Company’s Form 10-K Annual Reports.

IN WITNESS WHEREOF, I have hereunto set my hand this 26th day of February 2012.

/s/ James Balog

Member of the Board of Directors of

Great-West Life & Annuity Insurance Company

Witness:

/s/ Alvina Balog

Signature

Alvina Balog

Name (Printed)

POWER OF ATTORNEY

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

Know all men by these presents, that I, John L. Bernbach, a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, a Colorado corporation, do hereby constitute and appoint each of R.G. Schultz and J.H. Van Harmelen as my true and lawful attorney and agent for me and in my name and on my behalf to, individually and without the concurrence of the other attorney and agent, sign my name, in my capacity as a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, on Form 10-K Annual Reports of Great-West Life & Annuity Insurance Company to be filed with the Securities and Exchange Commission from time to time, and to any and all amendments thereto.

I hereby revoke any prior Power of Attorney given for the purpose of signing my name on Great-West Life & Annuity Insurance Company’s Form 10-K Annual Reports.

IN WITNESS WHEREOF, I have hereunto set my hand this 26th day of January 2012.

/s/ John L. Bernbach

Member of the Board of Directors of

Great-West Life & Annuity Insurance Company

Witness:

/s/ Deborah A. Brown

Signature

Deborah A. Brown

Name (Printed)

POWER OF ATTORNEY

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

Know all men by these presents, that I, André Desmarais, a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, a Colorado corporation, do hereby constitute and appoint each of R.G. Schultz and J.H. Van Harmelen as my true and lawful attorney and agent for me and in my name and on my behalf to, individually and without the concurrence of the other attorney and agent, sign my name, in my capacity as a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, on Form 10-K Annual Reports of Great-West Life & Annuity Insurance Company to be filed with the Securities and Exchange Commission from time to time, and to any and all amendments thereto.

I hereby revoke any prior Power of Attorney given for the purpose of signing my name on Great-West Life & Annuity Insurance Company’s Form 10-K Annual Reports.

IN WITNESS WHEREOF, I have hereunto set my hand this 13th day of January 2012.

/s/ André Desmarais

Member of the Board of Directors of

Great-West Life & Annuity Insurance Company

Witness:

/s/ Guy Fortin

Signature

Guy Fortin

Name (Printed)

POWER OF ATTORNEY

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

Know all men by these presents, that I, Paul Desmarais, Jr., a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, a Colorado corporation, do hereby constitute and appoint each of R.G. Schultz and J.H. Van Harmelen as my true and lawful attorney and agent for me and in my name and on my behalf to, individually and without the concurrence of the other attorney and agent, sign my name, in my capacity as a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, on Form 10-K Annual Reports of Great-West Life & Annuity Insurance Company to be filed with the Securities and Exchange Commission from time to time, and to any and all amendments thereto.

I hereby revoke any prior Power of Attorney given for the purpose of signing my name on Great-West Life & Annuity Insurance Company’s Form 10-K Annual Reports.

IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of January 2012.

/s/ Paul Desmarais, Jr.

Member of the Board of Directors of

Great-West Life & Annuity Insurance Company

Witness:

/s/ Lucie Thibault

Signature

Lucie Thibault

Name (Printed)

POWER OF ATTORNEY

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

Know all men by these presents, that I, Alain Louvel, a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, a Colorado corporation, do hereby constitute and appoint each of R.G. Schultz and J.H. Van Harmelen as my true and lawful attorney and agent for me and in my name and on my behalf to, individually and without the concurrence of the other attorney and agent, sign my name, in my capacity as a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, on Form 10-K Annual Reports of Great-West Life & Annuity Insurance Company to be filed with the Securities and Exchange Commission from time to time, and to any and all amendments thereto.

I hereby revoke any prior Power of Attorney given for the purpose of signing my name on Great-West Life & Annuity Insurance Company’s Form 10-K Annual Reports.

IN WITNESS WHEREOF, I have hereunto set my hand this 26th day of January 2012.

/s/ Alain Louvel

Member of the Board of Directors of

Great-West Life & Annuity Insurance Company

Witness:

/s/ Anne Louvel

Signature

Anne Louvel

Name (Printed)

POWER OF ATTORNEY

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

Know all men by these presents, that I, Raymond L. McFeetors, a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, a Colorado corporation, do hereby constitute and appoint each of R.G. Schultz and J.H. Van Harmelen as my true and lawful attorney and agent for me and in my name and on my behalf to, individually and without the concurrence of the other attorney and agent, sign my name, in my capacity as a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, on Form 10-K Annual Reports of Great-West Life & Annuity Insurance Company to be filed with the Securities and Exchange Commission from time to time, and to any and all amendments thereto.

I hereby revoke any prior Power of Attorney given for the purpose of signing my name on Great-West Life & Annuity Insurance Company’s Form 10-K Annual Reports.

IN WITNESS WHEREOF, I have hereunto set my hand this 27th day of January 2012.

/s/ Raymond L. McFeetors

Member of the Board of Directors of

Great-West Life & Annuity Insurance Company

Witness:

/s/ Darlene Boutet

Signature

Darlene Boutet

Name (Printed)

POWER OF ATTORNEY

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

Know all men by these presents, that I, Jerry E. A. Nickerson, a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, a Colorado corporation, do hereby constitute and appoint each of R.G. Schultz and J.H. Van Harmelen as my true and lawful attorney and agent for me and in my name and on my behalf to, individually and without the concurrence of the other attorney and agent, sign my name, in my capacity as a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, on Form 10-K Annual Reports of Great-West Life & Annuity Insurance Company to be filed with the Securities and Exchange Commission from time to time, and to any and all amendments thereto.

I hereby revoke any prior Power of Attorney given for the purpose of signing my name on Great-West Life & Annuity Insurance Company’s Form 10-K Annual Reports.

IN WITNESS WHEREOF, I have hereunto set my hand this 8th day of February 2012.

/s/ Jerry E.A. Nickerson

Member of the Board of Directors of

Great-West Life & Annuity Insurance Company

Witness:

/s/ Darlene Boutet

Signature

Darlene Boutet

Name (Printed)

POWER OF ATTORNEY

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

Know all men by these presents, that I, R. Jeffrey Orr, a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, a Colorado corporation, do hereby constitute and appoint each of R.G. Schultz and J.H. Van Harmelen as my true and lawful attorney and agent for me and in my name and on my behalf to, individually and without the concurrence of the other attorney and agent, sign my name, in my capacity as a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, on Form 10-K Annual Reports of Great-West Life & Annuity Insurance Company to be filed with the Securities and Exchange Commission from time to time, and to any and all amendments thereto.

I hereby revoke any prior Power of Attorney given for the purpose of signing my name on Great-West Life & Annuity Insurance Company’s Form 10-K Annual Reports.

IN WITNESS WHEREOF, I have hereunto set my hand this 26th day of January 2012.

/s/ R. Jeffrey Orr

Member of the Board of Directors of

Great-West Life & Annuity Insurance Company

Witness:

/s/ Marie Selye

Signature

Marie Selye

Name (Printed)

POWER OF ATTORNEY

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

Know all men by these presents, that I, Michel Plessis-Bélair, a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, a Colorado corporation, do hereby constitute and appoint each of R.G. Schultz and J.H. Van Harmelen as my true and lawful attorney and agent for me and in my name and on my behalf to, individually and without the concurrence of the other attorney and agent, sign my name, in my capacity as a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, on Form 10-K Annual Reports of Great-West Life & Annuity Insurance Company to be filed with the Securities and Exchange Commission from time to time, and to any and all amendments thereto.

I hereby revoke any prior Power of Attorney given for the purpose of signing my name on Great-West Life & Annuity Insurance Company’s Form 10-K Annual Reports.

IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of January 2012.

/s/ Michel Plessis-Bélair

Member of the Board of Directors of

Great-West Life & Annuity Insurance Company

Witness:

/s/ Danielle Durocher

Signature

Danielle Durocher

Name (Printed)

POWER OF ATTORNEY

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

Know all men by these presents, that I, Henri-Paul Rousseau, a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, a Colorado corporation, do hereby constitute and appoint each of R.G. Schultz and J.H. Van Harmelen as my true and lawful attorney and agent for me and in my name and on my behalf to, individually and without the concurrence of the other attorney and agent, sign my name, in my capacity as a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, on Form 10-K Annual Reports of Great-West Life & Annuity Insurance Company to be filed with the Securities and Exchange Commission from time to time, and to any and all amendments thereto.

I hereby revoke any prior Power of Attorney given for the purpose of signing my name on Great-West Life & Annuity Insurance Company’s Form 10-K Annual Reports.

IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of January 2012.

/s/ Henri-Paul Rousseau

Member of the Board of Directors of

Great-West Life & Annuity Insurance Company

Witness:

/s/ Maria Iacampo

Signature

Maria Iacampo

Name (Printed)

POWER OF ATTORNEY

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

Know all men by these presents, that I, Raymond Royer, a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, a Colorado corporation, do hereby constitute and appoint each of R.G. Schultz and J.H. Van Harmelen as my true and lawful attorney and agent for me and in my name and on my behalf to, individually and without the concurrence of the other attorney and agent, sign my name, in my capacity as a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, on Form 10-K Annual Reports of Great-West Life & Annuity Insurance Company to be filed with the Securities and Exchange Commission from time to time, and to any and all amendments thereto.

I hereby revoke any prior Power of Attorney given for the purpose of signing my name on Great-West Life & Annuity Insurance Company’s Form 10-K Annual Reports.

IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of January 2012.

/s/ Raymond Royer

Member of the Board of Directors of

Great-West Life & Annuity Insurance Company

Witness:

/s/ Danielle Durocher

Signature

Danielle Durocher

Name (Printed)

POWER OF ATTORNEY

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

Know all men by these presents, that I, Philip K. Ryan, a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, a Colorado corporation, do hereby constitute and appoint each of R.G. Schultz and J.H. Van Harmelen as my true and lawful attorney and agent for me and in my name and on my behalf to, individually and without the concurrence of the other attorney and agent, sign my name, in my capacity as a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, on Form 10-K Annual Reports of Great-West Life & Annuity Insurance Company to be filed with the Securities and Exchange Commission from time to time, and to any and all amendments thereto.

I hereby revoke any prior Power of Attorney given for the purpose of signing my name on Great-West Life & Annuity Insurance Company’s Form 10-K Annual Reports.

IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of January 2012.

/s/ Philip K. Ryan

Member of the Board of Directors of

Great-West Life & Annuity Insurance Company

Witness:

/s/ Maria Cristina Cocca

Signature

Maria Cristina Cocca

Name (Printed)

POWER OF ATTORNEY

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

Know all men by these presents, that I, T. Timothy Ryan, Jr., a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, a Colorado corporation, do hereby constitute and appoint each of R.G. Schultz and J.H. Van Harmelen as my true and lawful attorney and agent for me and in my name and on my behalf to, individually and without the concurrence of the other attorney and agent, sign my name, in my capacity as a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, on Form 10-K Annual Reports of Great-West Life & Annuity Insurance Company to be filed with the Securities and Exchange Commission from time to time, and to any and all amendments thereto.

I hereby revoke any prior Power of Attorney given for the purpose of signing my name on Great-West Life & Annuity Insurance Company’s Form 10-K Annual Reports.

IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of January 2012.

/s/ T. Timothy Ryan, Jr.

Member of the Board of Directors of

Great-West Life & Annuity Insurance Company

Witness:

/s/ Margaret Jennings

Signature

Margaret Jennings

Name (Printed)

POWER OF ATTORNEY

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

Know all men by these presents, that I, Brian E. Walsh, a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, a Colorado corporation, do hereby constitute and appoint each of R.G. Schultz and J.H. Van Harmelen as my true and lawful attorney and agent for me and in my name and on my behalf to, individually and without the concurrence of the other attorney and agent, sign my name, in my capacity as a Member of the Board of Directors of Great-West Life & Annuity Insurance Company, on Form 10-K Annual Reports of Great-West Life & Annuity Insurance Company to be filed with the Securities and Exchange Commission from time to time, and to any and all amendments thereto.

I hereby revoke any prior Power of Attorney given for the purpose of signing my name on Great-West Life & Annuity Insurance Company’s Form 10-K Annual Reports.

IN WITNESS WHEREOF, I have hereunto set my hand this 30th day of January 2012.

/s/ Brian E. Walsh

Member of the Board of Directors of

Great-West Life & Annuity Insurance Company

Witness:

/s/ Diana Mathewson

Signature

Diana Mathewson

Name (Printed)