Supplemental Indenture No. 11 dated as of May 15, 2024 between Southwestern Public Service Company and U.S. Bank Trust Company, National Association (as successor to U.S. Bank National Association), as Trustee, creating 6.00% First Mortgage Bonds, Series No. 11 due 2054

Payment of the principal of this Security and interest hereon at Maturity shall be made upon presentation of this Security at the Corporate Trust Office of U.S. Bank Trust Company, National Association in New York, New York, or at such other office or agency as may be designated for such purpose by the Company from time to time. Payment of interest on this Security (other than interest at Maturity) shall be made by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register, except that if such Person shall be a securities depositary, such payment may be made by such other means in lieu of check as shall be agreed upon by the Company, the Trustee and such Person. Payment of the principal of and interest on this Security, as aforesaid, shall be made in such coin or currency of the United States of America as at the time of payment shall be legal tender for the payment of public and private debts.

This Security is one of a duly authorized issue of securities of the Company (herein called the “Securities”), issued and issuable in one or more series under and equally secured by an Indenture, dated as of August 1, 2011 (the “Original Indenture” and such Indenture as supplemented or amended from time to time thereafter, together with any constituent instruments establishing the terms of particular Securities, being herein called the “Indenture”), between the Company and U.S. Bank Trust Company, National Association as trustee (herein called the “Trustee,” which term includes any successor trustee under the Indenture), to which Indenture and all indentures supplemental thereto reference is hereby made for a description of the property mortgaged, pledged and held in trust, the nature and extent of the security and the respective rights, limitations of rights, duties and immunities of the Company, the Trustee and the Holders of the Securities thereunder and of the terms and conditions upon which the Securities are, and are to be, authenticated and delivered and secured. The acceptance of this Security shall be deemed to constitute the consent and agreement by the Holder hereof to all of the terms and provisions of the Indenture. This Security is one of the series designated above.

If any Interest Payment Date, any Redemption Date or the Stated Maturity shall not be a Business Day (as hereinafter defined), payment of the amounts due on this Security on such date may be made on the next succeeding Business Day; and, if such payment is made or duly provided for on such Business Day, no interest shall accrue on such amounts for the period from and after such Interest Payment Date, such Redemption Date or Stated Maturity, as the case may be, to such Business Day.

Prior to December 1, 2053 (six months prior to the Stated Maturity) (the “Par Call Date”), the Company may redeem the Securities of this series at its option, in whole or in part, at any time and from time to time, at a Redemption Price (expressed as a percentage of principal amount and rounded to three decimal places) equal to the greater of:

(1) (a) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the Redemption Date (assuming the Securities of this series matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate (as defined below) plus 25 basis points less (b) interest accrued to the Redemption Date, and

(2) 100% of the principal amount of the Securities of this series to be redeemed,

plus, in either case, accrued and unpaid interest thereon to, but excluding, the Redemption Date.

On or after the Par Call Date, the Company may redeem the Securities of this series at its option, in whole or in part, at any time and from time to time, at a Redemption Price equal to 100% of the principal amount of the Securities of this series being redeemed plus accrued and unpaid interest thereon to, but excluding, the Redemption Date.

“Treasury Rate” means, with respect to any Redemption Date, the yield determined by the Company in accordance with the following two paragraphs.

The Treasury Rate shall be determined by the Company after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third business day preceding the Redemption Date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily)—H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities–Treasury constant maturities–Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Company shall select, as applicable:

(1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the redemption date to the Par Call Date (the “Remaining Life”); or

(2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields—one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life—and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or

(3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the redemption date.

If on the third business day preceding the redemption date H.15 TCM is no longer published, the Company shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second business day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date but there are two or more United States Treasury

securities with a maturity date equally distant from the Par Call Date, one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Company shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Company shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places. The Company’s actions and determinations in determining the Redemption Price shall be conclusive and binding for all purposes, absent manifest error. The Trustee shall have no duty to determine, or verify the calculation of, the Redemption Price.

In lieu of the time periods set forth in Section 504 of the Original Indenture, notices of redemption with respect to the Securities shall be given not less than 10 days nor more than 60 days prior to the Redemption Date.

If an Event of Default shall occur and be continuing, the principal of this Security may be declared due and payable in the manner and with the effect provided in the Indenture.

The Indenture permits, with certain exceptions as therein provided, the Trustee to enter into one or more supplemental indentures for the purpose of adding any provisions to, or changing in any manner or eliminating any of the provisions of, the Indenture with the consent of the Holders of not less than a majority in aggregate principal amount of the Securities of all series then Outstanding under the Indenture, considered as one class; provided, however, that if there shall be Securities of more than one series Outstanding under the Indenture and if a proposed supplemental indenture shall directly affect the rights of the Holders of Securities of one or more, but less than all, of such series, then the consent only of the Holders of a majority in aggregate principal amount of the Outstanding Securities of all series so directly affected, considered as one class, shall be required; and provided, further, that if the Securities of any series shall have been issued in more than one Tranche and if the proposed supplemental indenture shall directly affect the rights of the Holders of Securities of one or more, but less than all, of such Tranches, then the consent only of the Holders of a majority in aggregate principal amount of the Outstanding Securities of all Tranches so directly affected, considered as one class, shall be required; and provided, further, that the Indenture permits the Trustee to enter into one or more supplemental indentures for limited purposes without the consent of any Holders of Securities. The Indenture also contains provisions permitting the Holders of a majority in principal amount of the Securities then Outstanding, on behalf of the Holders of all Securities, to waive compliance by the Company with certain provisions of the Indenture and certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder of this Security shall be conclusive and binding upon such Holder and upon all future Holders of this Security and of any Security issued upon the registration of transfer hereof or in exchange therefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Security.

As provided in the Indenture and subject to certain limitations therein set forth, this Security or any portion of the principal amount hereof will be deemed to have been paid for all purposes of the Indenture and to be no longer Outstanding thereunder, and, at the election of the Company, the Company’s entire indebtedness in respect thereof will be satisfied and discharged, if there has been irrevocably deposited with the Trustee or any Paying Agent (other than the Company), in trust, money in an amount which will be sufficient and/or Eligible Obligations, the principal of and interest on which when due, without regard to any reinvestment thereof, will provide moneys which, together with moneys so deposited, will be sufficient to pay when due the principal of and interest on this Security when due.

As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Security is registrable in the Security Register, upon surrender of this Security for registration of transfer at the corporate office of U.S. Bank Trust Company, National Association in New York, New York, or such other office or agency as may be designated by the Company from time to time, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company and the Security Registrar duly executed by, the Holder hereof or his attorney duly authorized in writing, and thereupon one or more new Securities of this series of authorized denominations and of like tenor and aggregate principal amount, will be issued to the designated transferee or transferees.

The Securities of this series are issuable only as registered Securities, without coupons, and in denominations of $2,000 and integral multiples of $1,000 in excess thereof. As provided in the Indenture and subject to certain limitations therein set forth, Securities of this series are exchangeable for a like aggregate principal amount of Securities of the same series, of any authorized denominations, as requested by the Holder surrendering the same, and of like tenor upon surrender of the Security or Securities to be exchanged at the office of U.S. Bank Trust Company, National Association in New York, New York, or such other office or agency as may be designated by the Company from time to time.

No service charge shall be made for any such registration of transfer or exchange, but the Company may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith.

Prior to due presentment of this Security for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the Person in whose name this Security is registered as the absolute owner hereof for all purposes, whether or not this Security be overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary.

The Indenture and the Securities shall be governed by and construed in accordance with the laws of the State of New York (including without limitation Section 5-1401 of the New York General Obligations Law or any successor to such statute), except to the extent that the Trust Indenture Act of 1939, as then in effect or any successor statute shall be applicable and except to

the extent that the law of any jurisdiction wherein any portion of the property mortgaged pursuant to the Indenture or any indenture supplemental thereto is located shall mandatorily govern the attachment, perfection, priority or enforcement of the lien of the Indenture and all indentures supplemental thereto with respect to such portion of the mortgaged property.

As used herein, “Business Day” means any day, other than a Saturday or Sunday, that is not a day on which the offices of the Trustee in The City of New York, New York, or other city in which is located any office or agency maintained for the payment of principal or interest on this Security, are generally authorized or required by law or executive order to remain closed. All other terms used in this Security which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

As provided in the Indenture, no recourse shall be had for the payment of the principal of or premium, if any, or interest on any Securities, or any part thereof, or for any claim based thereon or otherwise in respect thereof, or of the indebtedness represented thereby, or upon any obligation, covenant or agreement under the Indenture, against, and no personal liability whatsoever shall attach to, or be incurred by, any incorporator, shareholder, officer or director, as such, past, present or future of the Company or of any predecessor or successor corporation (either directly or through the Company or a predecessor or successor corporation), whether by virtue of any constitutional provision, statute or rule of law, or by the enforcement of any assessment or penalty or otherwise; it being expressly agreed and understood that the Indenture and all the Securities are solely corporate obligations and that any such personal liability is hereby expressly waived and released as a condition of, and as part of the consideration for, the execution of the Indenture and the issuance of the Securities.

Unless the certificate of authentication hereon has been executed by the Trustee or an Authenticating Agent by manual signature, this Security shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose.

IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed.

CERTIFICATE OF AUTHENTICATION

This is one of the Securities of the series designated therein referred to in the within-mentioned Indenture.

Dated:

Unless this certificate is presented by an authorized representative of The Depository Trust Company, a New York Corporation (“DTC”), to the Company or its agent for registration of transfer, exchange, or payment, and any certificate issued is registered in the name of Cede & Co. or in such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein.

This Security may not be transferred or exchanged, nor may any purported transfer be registered, except (i) this Security may be transferred in whole, and appropriate registration of transfer effected, if such transfer is by Cede & Co., as nominee for DTC (the “Depositary”), to the Depositary, or by the Depositary to another nominee thereof, or by any nominee of the Depositary to any other nominee thereof, or by the Depositary or any nominee thereof to any successor securities depositary or any nominee thereof; and (ii) this Security may be exchanged for definitive Securities registered in the respective names of the beneficial holders hereof, and thereafter shall be transferable without restrictions if: (A) the Depositary, or any successor securities depositary, shall have notified the Company and the Trustee that it is unwilling or unable to continue to act as securities depositary with respect to the Securities and the Trustee shall not have been notified by the Company within ninety (90) days of the identity of a successor securities depositary with respect to the Securities; or (B) the Company shall have delivered to the Trustee a Company Order to the effect that the Securities shall be so exchangeable on and after a date specified therein or (C) (1) an Event of Default shall have occurred and be continuing, (2) the Trustee shall have given notice of such Event of Default pursuant to Section 1002 of the Original Indenture and (3) there shall have been delivered to the Company and the Trustee an Opinion of Counsel to the effect that the interests of the beneficial owners of such Securities in respect thereof will be materially impaired unless such owners become Holders of definitive Securities.

FOR VALUE RECEIVED the undersigned hereby sells, assigns and transfers unto

[please insert social security or other identifying number of assignee]

[please print or typewrite name and address of assignee]

the within Security of SOUTHWESTERN PUBLIC SERVICE COMPANY and does hereby irrevocably constitute and appoint    , Attorney, to transfer said Security on the books of the within-mentioned Company, with full power of substitution in the premises.

Dated:            

Notice: The signature to this assignment must correspond with the name as written upon the face of the Security in every particular without alteration or enlargement or any change whatsoever.

SCHEDULE A

TEXAS COUNTY RECORDINGS

The Indenture dated as of August 1, 2011, granted by Southwestern Public Service Company to U.S. Bank National Association, Trustee (predecessor-in-interest to U.S. Bank Trust Company, National Association, the current Trustee), was filed with the Secretary of State of the State of Texas on August 2, 2011 as Utility Security Instrument No. 11-0022610194.

In accordance with Texas Business and Commerce Code Section 261.011, a Notice of Utility Security Instrument Affecting Real Property was thereafter recorded in each Texas county in which any of the Mortgaged Property consisting of real property was located as of the Effective Date of such Indenture. The following table sets forth recording information relating to the recordation, in each of the specified Texas counties, of such Notice of Utility Security Instrument Affecting Real Property:

Schedule A-1

Schedule A-2

Schedule A-3

Schedule A-4

*

NEW MEXICO COUNTY RECORDINGS

The Indenture dated as of August 1, 2011, granted by Southwestern Public Service Company to U.S. Bank National Association, Trustee (predecessor-in-interest to U.S. Bank Trust Company, National Association, the current Trustee), was filed with the Secretary of State of the State of New Mexico on August 2, 2011 under the Public Utility Act, receiving Public Utility Filing No. 599. Concurrently with such filing, a Uniform Commercial Code financing statement, to which a copy of such Indenture was appended as an exhibit, was filed in the Uniform Commercial Code records of the Secretary of State of the State of New Mexico on August 2, 2011 as UCC Filing No. 20110012866J.

In accordance with New Mexico Statutes Annotated, 1978, Section 62-13-11, a Notice of Filing of Indenture with New Mexico Secretary of State, to which a copy of such Indenture was appended as an exhibit, was thereafter recorded in each New Mexico county in which any of the Mortgaged Property consisting of real property was located as of the Effective Date of such Indenture. The following table sets forth recording information relating to the recordation, in each of the specified New Mexico counties, of such Notice of Filing of Indenture with New Mexico Secretary of State:

Schedule A-5

The following table sets forth recording information relating to the recordation, in each of the specified New Mexico counties, of a Notice of Filing of Supplemental Indenture with the New Mexico Secretary of State with respect to Supplemental Indenture No. 1:

The following table sets forth recording information relating to the recordation, in each of the specified New Mexico counties, of a Notice of Filing of Supplemental Indenture with the New Mexico Secretary of State with respect to Supplemental Indenture No. 2:

Schedule A-6

The following table sets forth recording information relating to the recordation, in each of the specified New Mexico counties, of a Notice of Filing of Supplemental Indenture with the New Mexico Secretary of State with respect to Supplemental Indenture No. 3:

The following table sets forth recording information relating to the recordation, in each of the specified New Mexico counties, of a Notice of Filing of Supplemental Indenture with the New Mexico Secretary of State with respect to Supplemental Indenture No. 4:

Schedule A-7

The following table sets forth recording information relating to the recordation, in each of the specified New Mexico counties, of a Notice of Filing of Supplemental Indenture with the New Mexico Secretary of State with respect to Supplemental Indenture No. 5:

The following table sets forth recording information relating to the recordation, in each of the specified New Mexico counties, of a Notice of Filing of Supplemental Indenture with the New Mexico Secretary of State with respect to Supplemental Indenture No. 6:

Schedule A-8

The following table sets forth recording information relating to the recordation, in each of the specified New Mexico counties, of a Notice of Filing of Supplemental Indenture with the New Mexico Secretary of State with respect to Supplemental Indenture No. 7:

The following table sets forth recording information relating to the recordation, in each of the specified New Mexico counties, of a Notice of Filing of Supplemental Indenture with the New Mexico Secretary of State with respect to Supplemental Indenture No. 8:

Schedule A-9

The following table sets forth recording information relating to the recordation, in each of the specified New Mexico counties, of a Notice of Filing of Supplemental Indenture with the New Mexico Secretary of State with respect to Supplemental Indenture No. 9:

Schedule A-10

SCHEDULE B

Schedule B-1

SCHEDULE C

DESCRIPTION OF PROPERTY

A. FEE TITLE

The property referred to in Granting Clause Second of the Indenture includes, without limitation, the Company’s right, title and interest in and to the land acquired by the Company including the lands described in the following deeds into the Company and referenced recorded documents (the “Lands”), together with all property related, used or appurtenant thereto of the kind and nature described in Granting Clause First (other than Excepted Property) (“Fee Title”):

The following properties are in the State of Texas:

Dallam County, Texas

as to the following property:

A 3.03 ± acre tract of land out of Section 5, Block 48, H. & T.C. R.R. Co. Survey, Dallam County, Texas, further being out of a tract of land being described in that certain instrument recorded in Volume 182, Page 119, as filed in the Office of the County Clerk of Dallam County, Texas, having been surveyed on the ground by Furman Land Surveyors, Inc. and being described by metes and bounds as follows:

(Bearings and Distances are Grid UTM Coordinate System-Zone 13N, NAD (1983) using GPS relative positioning techniques based on Network RTK. Combined Scale Factor = 1.00003555)

COMMENCING at a spike marked “Survey Marker” found and accepted for the Southwest corner of said Section 5, from whence a spike marked “Survey Marker” found and accepted for the Southeast corner of said Section 5, bears N. 88° 28’ 55” E. (Base Line) 5296.27 feet;

THENCE, N. 88° 28’ 55” E. 2610.20 feet along the South line of said Section 5 to a point;

THENCE, N. 01° 39’ 57” W. 50.00 feet to a ¹/₂ inch iron rod with cap stamped “FURMAN RPLS” set for the Southeast and BEGINNING CORNER of this tract of land in the North Right-of-Way line of F.M. 297 (1st Street) and the West Right-of-Way line of Jefferson Avenue as monumented on the ground;

Schedule C-1

THENCE, S. 88° 28’ 55” W. 370.40 feet along said North Right-of-Way line to a¹/₂ inch iron rod with cap stamped “FURMAN RPLS” set for the Southwest corner of this tract of land;

THENCE, N. 01° 39’ 57” W. 356.85 feet to a ¹/₂ inch iron rod with cap stamped “FURMAN RPLS” set for the Northwest corner of this tract of land and in the South line of a tract of land described in that certain instrument in Default Judgment Case No. 12747, as filed in the Office of the County Clerk of Dallam County, Texas;

THENCE, N. 88° 28’ 55” E. 370.40 feet along the common line of this tract of land and said tract of land described in Default Judgment Case No. 12747, to a ¹/₂ inch iron rod with cap “GALLEGLY 2241” found in the West Right-of-Way line of Jefferson Avenue as monumented on the ground, from whence a 1/2 inch iron rod with cap “GALLEGLY 2241” bears N. 01° 39’ 57” W. 60.01 feet;

THENCE, S. 01° 39’ 57” E. 356.85 feet along said West Right-of-Way line to the PLACE OF BEGINNING; and

containing 3.03 acres of land, more or less.

Moore County, Texas

The description of SPS 765 Dumas South in Moore County, Texas is amended to add the below Tract 2 to the description.

Tract 1: East half of Lots 13 through 18, Block 162, Town of Dumas, Moore County, Texas.

Tract 2: Lots 13 through 21, Block 107, and Lots 25 through 23, Block 135, in Wildorado, Moore County, Texas.

Schedule C-2

Potter County, Texas

as to the following property:

A tract of land out of Section 72, Block 018, D. & P. R.R. Co. Survey, Potter County, Texas, also being out of that certain tract of land described in that certain instrument recorded in Volume 2086, Page 9 as filed in the Official Public Records of Potter County, Texas, said tract of land having been surveyed on the ground by Furman Land Surveyors, Inc. on July 15, 2020 and being described by metes and bounds as follows:

Bearings and Distances are Grid UTM Coordinate System-Zone 14N, NAD (1983) using GPS relative positioning techniques based on multiple OPUS solutions on June 30, 2020. Combined Scale Factor = 1.000295305(Grid Distance/1.000295305 = Ground Distance)

COMMENCING at a 4” iron rod found for the Northwest corner of said Section 72 from whence a ¹/₄” iron pipe found for the Southeast corner of Section 78, Block 018, D. & P. R.R. Co. Survey bears S. 01° 42’ 57 W. (Base Line) 7532.81 feet;

THENCE, S. 01° 42’ 57” W. 4634.81 feet along the West line of said Section 72 to a point;

THENCE, S. 88° 17’ 03” E. 2220.94 feet to a ¹/₄” iron rod with a cap stamped “Furman RPLS” set for the Southwest and BEGINNING CORNER of this tract of land, same being the Southeast corner of a simultaneously surveyed 50 foot wide access road easement;

THENCE, N. 01° 42’ 57 E. 983.00 feet to a ¹/₄” iron rod with a cap stamped “Furman RPLS” set, being the Northwest corner of this tract of land;

THENCE, S. 88° 17’ 03” E. 1330.00 feet to a ¹/₄” iron rod with a cap stamped “Furman RPLS” set, being the Northeast corner of this tract of land;

THENCE, S. 01° 42’ 57 W. 983.00 feet to a ¹/₄” iron rod with a cap stamped “Furman RPLS” set, being the Southeast corner of this tract of land;

THENCE, N. 88° 17’ 03” W. 1330.00 feet to the POINT OF BEGINNING; and

containing 30.00 actual acres, more or less.

Schedule C-3

Corrections and Revisions to Descriptions of Some Texas Properties

Lubbock County, Texas

SPS 735 Idalou Power Site Power Site Parcel 2

The chart at the beginning of the description of this property is revised as follows to add to the reference to the Deed into the Company the date of the execution and recording of the Deed.

Parmer County, Texas

SPS 834 Parmer County

The chart at the beginning of the description of this property is revised as follows to add to the reference to the Deed into the Company the grantors names and the date of the execution and recording of the Deed.

Randall County, Texas

SPS 5148 Randall County Interchange Parcel 2 Expansion

The chart at the beginning of the description of this property is revised as follows to state the Common Name of this property as Randall County Substation Parcel 2 Expansion as opposed to “Randall County Substation Parcel 2”.

Schedule C-4

SPS 5228 Canyon Service Center

The description of this property is amended to add that the property has been platted as follows:

Lot 1, Block 1, Xcel Energy Addition # 1, filed November 29, 2017, and recorded in the Official Public Records, Randall County, Texas.

SPS 5254 Preston West Substation

The description of this property set out in Supplemental Indenture No. 6 in error refers to the property as being in the “R. S. F. Survey”, as opposed to being in the R. B. S. & F. Survey. The description is revised to refer to this property being in the R. B. S. & F. Survey.

Sherman County, Texas

SPS 1041 Stratford City

The Chart at the beginning of the description of SPS 1041 Stratford City in error identified the SPS Id No. as “1040”. The SPS Id No. for this property is corrected to read “1041”.

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Schedule C-5

The following properties are in the State of New Mexico:

Lea County, New Mexico

As to following described real estate in Lea County, New Mexico:

For Surface Title Only:

Lot Thirteen A (13-A), Hobbs Industrial Airpark South Subdivision to the City of Hobbs, Lea County, New Mexico, as referenced on that Replat filed August 11, 2022, in Book 2199, Page 644, Lea County Records, Lea County, New Mexico.

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Schedule C-6