Exhibit 24

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer of Southwestern Public Service Company, a New Mexico corporation, does hereby make, constitute and appoint RICHARD C. KELLY, BENJAMIN G.S. FOWKE III and DAVID M. SPARBY, and each or any of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Registration Statement or Registration Statements on Form S-3 or other applicable form, and all amendments, including post-effective amendments, thereto, and all registration statements for the same offering that are to be effective upon filing pursuant to Rule 462(b) under the Securities Act of 1933, as amended, to be filed by said Company with the Securities and Exchange Commission, Washington, D.C. in connection with the registration under the Securities Act of 1933, as amended, of debt securities, guarantees, and other securities related thereto (all of the foregoing being referred to in this Power of Attorney as “Securities”) proposed to be sold by said Company from time to time, and/or proposed to be registered by the Company for re-sale and/or exchange on behalf of one or more holders of such Securities, and to file the same, with all exhibits thereto and other supporting documents, with said Commission, granting unto said attorneys-in-fact, and each of them, full power and authority to do and perform any and all acts necessary or incidental to the performance and execution of the powers herein expressly granted, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or any of them, or their, or his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 24th day of May, 2011.

/s/  C. Riley Hill

C. Riley Hill

President, Chief Executive Officer and Director

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer of Southwestern Public Service Company, a New Mexico corporation, does hereby make, constitute and appoint RICHARD C. KELLY, BENJAMIN G.S. FOWKE III and DAVID M. SPARBY, and each or any of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Registration Statement or Registration Statements on Form S-3 or other applicable form, and all amendments, including post-effective amendments, thereto, and all registration statements for the same offering that are to be effective upon filing pursuant to Rule 462(b) under the Securities Act of 1933, as amended, to be filed by said Company with the Securities and Exchange Commission, Washington, D.C. in connection with the registration under the Securities Act of 1933, as amended, of debt securities, guarantees, and other securities related thereto (all of the foregoing being referred to in this Power of Attorney as “Securities”) proposed to be sold by said Company from time to time, and/or proposed to be registered by the Company for re-sale and/or exchange on behalf of one or more holders of such Securities, and to file the same, with all exhibits thereto and other supporting documents, with said Commission, granting unto said attorneys-in-fact, and each of them, full power and authority to do and perform any and all acts necessary or incidental to the performance and execution of the powers herein expressly granted, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or any of them, or their, or his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 23rd day of May, 2011.

/s/  David M. Sparby

David M. Sparby

Vice President, Chief Financial Officer and Director

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer of Southwestern Public Service Company, a New Mexico corporation, does hereby make, constitute and appoint RICHARD C. KELLY, BENJAMIN G.S. FOWKE III and DAVID M. SPARBY, and each or any of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Registration Statement or Registration Statements on Form S-3 or other applicable form, and all amendments, including post-effective amendments, thereto, and all registration statements for the same offering that are to be effective upon filing pursuant to Rule 462(b) under the Securities Act of 1933, as amended, to be filed by said Company with the Securities and Exchange Commission, Washington, D.C. in connection with the registration under the Securities Act of 1933, as amended, of debt securities, guarantees, and other securities related thereto (all of the foregoing being referred to in this Power of Attorney as “Securities”) proposed to be sold by said Company from time to time, and/or proposed to be registered by the Company for re-sale and/or exchange on behalf of one or more holders of such Securities, and to file the same, with all exhibits thereto and other supporting documents, with said Commission, granting unto said attorneys-in-fact, and each of them, full power and authority to do and perform any and all acts necessary or incidental to the performance and execution of the powers herein expressly granted, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or any of them, or their, or his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 24th day of May, 2011.

/s/  Teresa S. Madden

Teresa S. Madden

Vice President and Controller

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer of Southwestern Public Service Company, a New Mexico corporation, does hereby make, constitute and appoint RICHARD C. KELLY, BENJAMIN G.S. FOWKE III and DAVID M. SPARBY, and each or any of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Registration Statement or Registration Statements on Form S-3 or other applicable form, and all amendments, including post-effective amendments, thereto, and all registration statements for the same offering that are to be effective upon filing pursuant to Rule 462(b) under the Securities Act of 1933, as amended, to be filed by said Company with the Securities and Exchange Commission, Washington, D.C. in connection with the registration under the Securities Act of 1933, as amended, of debt securities, guarantees, and other securities related thereto (all of the foregoing being referred to in this Power of Attorney as “Securities”) proposed to be sold by said Company from time to time, and/or proposed to be registered by the Company for re-sale and/or exchange on behalf of one or more holders of such Securities, and to file the same, with all exhibits thereto and other supporting documents, with said Commission, granting unto said attorneys-in-fact, and each of them, full power and authority to do and perform any and all acts necessary or incidental to the performance and execution of the powers herein expressly granted, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or any of them, or their, or his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 24th day of May, 2011.

/s/  Richard C. Kelly

Richard C. Kelly

Chairman and Director

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned director and/or officer of Southwestern Public Service Company, a New Mexico corporation, does hereby make, constitute and appoint RICHARD C. KELLY, BENJAMIN G.S. FOWKE III and DAVID M. SPARBY, and each or any of them, the undersigned’s true and lawful attorneys-in-fact and agents, with full power of substitution, for the undersigned and in the undersigned’s name, place and stead and in any and all capacities, to sign and affix the undersigned’s name as such director and/or officer of said Company to a Registration Statement or Registration Statements on Form S-3 or other applicable form, and all amendments, including post-effective amendments, thereto, and all registration statements for the same offering that are to be effective upon filing pursuant to Rule 462(b) under the Securities Act of 1933, as amended, to be filed by said Company with the Securities and Exchange Commission, Washington, D.C. in connection with the registration under the Securities Act of 1933, as amended, of debt securities, guarantees, and other securities related thereto (all of the foregoing being referred to in this Power of Attorney as “Securities”) proposed to be sold by said Company from time to time, and/or proposed to be registered by the Company for re-sale and/or exchange on behalf of one or more holders of such Securities, and to file the same, with all exhibits thereto and other supporting documents, with said Commission, granting unto said attorneys-in-fact, and each of them, full power and authority to do and perform any and all acts necessary or incidental to the performance and execution of the powers herein expressly granted, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or any of them, or their, or his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 24th day of May, 2011.

/s/  Benjamin G.S. Fowke III

Benjamin G.S. Fowke III

Vice President and Director