Exhibit 24

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that I, Alain Louvel, a member of the Board of Directors of Great-West Life & Annuity Insurance Company (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that I, André R. Desmarais, a member of the Board of Directors of Great-West Life & Annuity Insurance Company (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

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 (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that I, Claude Généreux, a member of the Board of Directors of Great-West Life & Annuity Insurance Company (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that I, Gary A. Doer, a member of the Board of Directors of Great-West Life & Annuity Insurance Company (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that I, Gregory D. Tretiak, a member of the Board of Directors of Great-West Life & Annuity Insurance Company (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that I, Gregory J. Fleming, a member of the Board of Directors of Great-West Life & Annuity Insurance Company (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

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 (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that I, Jerome J. Selitto, a member of the Board of Directors of Great-West Life & Annuity Insurance Company (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

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 (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

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 (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that I, Marcel R. Coutu, a member of the Board of Directors of Great-West Life & Annuity Insurance Company (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that I, Paul A. Mahon, a member of the Board of Directors of Great-West Life & Annuity Insurance Company (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that I, Paul G. Desmarais, Jr., a member of the Board of Directors of Great-West Life & Annuity Insurance Company (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

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 (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that I, Raymond Royer, a member of the Board of Directors of Great-West Life & Annuity Insurance Company (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY

POWER OF ATTORNEY

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 (the “Company”), a Colorado corporation, do hereby constitute and appoint Richard G. Schultz and Ryan L. Logsdon, and each of them (with full power to each of them to act alone), as my true and lawful attorney-in-fact and agent, with full power of substitution and re-substitution, for me and in my name, place and stead, in any and all capacities to execute and file any and all reports (and amendments thereto) by the Company under the Securities Exchange Act of 1934 (including but not limited to any report on Form 10-K) and any and all registration statements by the Company or its separate accounts relating to annuity contracts and life insurance policies under the Securities Act of 1933 and/or the Investment Company Act of 1940, and any and all amendments thereto, including the “Registration Statements,” as defined below, with all exhibits, instruments, and other documents necessary or appropriate in connection therewith, and to file with the Securities and Exchange Commission or any other regulatory authority as may be necessary or desirable, hereby ratifying and confirming all and every act and thing requisite to all intents and purposes that said attorney in fact and agent or his or her substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney does not revoke any prior power of attorney.

The “Registration Statements” covered by the Power of Attorney are defined to include the registration statements listed below:

IN WITNESS WHEREOF, I have hereunto set my hand this 1^st day of November, 2017.