EX-4.01





 Exhibit 4.01 

PUBLIC SERVICE COMPANY 

OF COLORADO 
 TO 

U.S. BANK NATIONAL ASSOCIATION, 

as Trustee 
  

 
 Supplemental
Indenture No. 31 
 Dated as of May 1, 2020 

Supplemental to the Indenture 

dated as of October 1, 1993 
  

 
 Establishing the
Securities of Series Nos. 35 and 36 
 designated 2.70% First Mortgage Bonds, Series No. 35 due 2051, and 

1.90% First Mortgage Bonds, Series No. 36 due 2031, respectively 












 SUPPLEMENTAL INDENTURE NO. 31, dated as of May 1, 2020, between PUBLIC
SERVICE COMPANY OF COLORADO, a corporation duly organized and existing under the laws of the State of Colorado (hereinafter sometimes called the “Company”), and U.S. BANK NATIONAL ASSOCIATION, a national banking
association, as successor trustee (hereinafter sometimes called the “Trustee”) to Morgan Guaranty Trust Company of New York under the Indenture, dated as of October 1, 1993 (hereinafter called the “Original
Indenture”), as previously supplemented and as further supplemented by this Supplemental Indenture No. 31. The Original Indenture and any and all indentures and all other instruments supplemental thereto are hereinafter sometimes
collectively called the “Indenture”. 
 Recitals of the Company 

The Original Indenture was authorized, executed and delivered by the Company to provide for the issuance from time to time of its Securities
(such term and all other capitalized terms used herein without definition having the meanings assigned to them in the Original Indenture), to be issued in one or more series as contemplated therein, and to provide security for the payment of the
principal of and premium, if any, and interest, if any, on the Securities. The Original Indenture has been recorded in the office of the Clerk and Recorder of each county in the State of Colorado in which the Company owns real property that is used
in or in connection with the Electric Utility Business, as more fully set forth in Schedule A hereto. 
 The Company has heretofore executed
and delivered to the Trustee the Supplemental Indentures referred to in Schedule B hereto for the purpose of establishing various series of Securities and appointing previous successor Trustees. 

The Company desires to establish two new series of Securities to be designated “2.70% First Mortgage Bonds, Series No. 35 due
2051” and “1.90% First Mortgage Bonds, Series No. 36 due 2031” such series of Securities to be hereinafter sometimes called “Series No. 35” and “Series No. 36,” respectively. 

The Company has duly authorized the execution and delivery of this Supplemental Indenture No. 31 to establish the Securities of Series
No. 35 and Series No. 36 and has duly authorized the issuance of such Securities; and all acts necessary to make this Supplemental Indenture No. 31 a valid agreement of the Company, and to make the Securities of Series No. 35 and
Series No. 36 valid obligations of the Company, have been performed. 
 Granting Clauses 

NOW, THEREFORE, THIS SUPPLEMENTAL INDENTURE NO. 31 WITNESSETH, that, in consideration of the premises and of the purchase of the
Securities by the Holders thereof, and in order to secure the payment of the principal of and premium, if any, and interest, if any, on all Securities from time to time Outstanding and the performance of the covenants contained therein and in the
Indenture and to declare the terms and conditions on which such Securities are secured, the Company hereby grants, bargains, sells, releases, conveys, assigns, transfers, mortgages, pledges, sets over and confirms to the Trustee, and grants to the
Trustee a security interest in, the following: 
 Granting Clause First 

All right, title and interest of the Company, as of the date of the execution and delivery of this Supplemental Indenture
No. 31, in and to property (other than Excepted Property), real, personal and mixed and wherever situated, in any case used or to be used in or in connection with the Electric Utility Business (whether or not such use is the sole use of such
property), including without limitation (a) all lands and interests in land 

  
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described or referred to in Schedule C hereto, and all right, title and interest of the Company in goods, fixtures or improvements located on those lands, if any, described or referred to in
Schedule D hereto, provided that the Lien hereof shall not extend to or encumber the fee owner’s interest in any land or interest in land in which the Company holds only a leasehold interest; (b) all other lands, easements, servitudes,
licenses, permits, rights of way and other rights and interests in or relating to real property used or to be used in or in connection with the Electric Utility Business or relating to the occupancy or use of such real property, subject however, to
the exceptions and exclusions set forth in clause (a) of Granting Clause First of the Original Indenture; (c) all plants, generators, turbines, engines, boilers, fuel handling and transportation facilities, air and water pollution control
and sewage and solid waste disposal facilities and other machinery and facilities for the generation of electric energy; (d) all switchyards, lines, towers, substations, transformers and other machinery and facilities for the transmission of
electric energy; (e) all lines, poles, conduits, conductors, meters, regulators and other machinery and facilities for the distribution of electric energy; (f) all buildings, offices, warehouses and other structures used or to be used in
or in connection with the Electric Utility Business; (g) all pipes, cables, insulators, ducts, tools, computers and other data processing and/or storage equipment and other equipment, apparatus and facilities used or to be used in or in
connection with the Electric Utility Business; (h) any or all of the foregoing properties in the process of construction; and (i) all other property, of whatever kind and nature, ancillary to or otherwise used or to be used in conjunction
with any or all of the foregoing or otherwise, directly or indirectly, in furtherance of the Electric Utility Business; 
 Granting Clause
Second 
 Subject to the applicable exceptions permitted by Section 810(c), Section 1303 and Section 1305
of the Original Indenture, all property (other than Excepted Property) of the kind and nature described in Granting Clause First which may be hereafter acquired by the Company, it being the intention of the Company that all such property acquired by
the Company after the date of the execution and delivery of this Supplemental Indenture No. 31 shall be as fully embraced within and subjected to the Lien hereof as if such property were owned by the Company as of the date of the execution and
delivery of this Supplemental Indenture No. 31; 
 Granting Clause Fourth 

All other property of whatever kind and nature subjected or required to be subjected to the Lien of the Indenture by any of
the provisions thereof; 
 This Instrument shall constitute a financing statement under the Colorado Uniform Commercial Code
(the “UCC”) to be filed in the real estate records, and is filed as a fixture filing under the UCC covering goods which are, or are to become, fixtures on the real property described herein, in the Original Indenture and all
supplements to the Original Indenture; 
 Excepted Property 

Expressly excepting and excluding, however, from the Lien and operation of the Indenture all Excepted Property of the Company,
whether now owned or hereafter acquired; 

  
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 TO HAVE AND TO HOLD all such property, real, personal and mixed, unto the Trustee,
its successors in trust and their assigns forever; 
 SUBJECT, HOWEVER, to (a) Liens existing at the date of the execution and
delivery of the Original Indenture, (b) as to property acquired by the Company after the date of the execution and delivery of the Original Indenture, Liens existing or placed thereon at the time of the acquisition thereof (including, but not
limited to, the Lien of any Class A Mortgage and purchase money Liens), (c) Retained Interests and (d) any other Permitted Liens, it being understood that, with respect to any property which was at the date of execution and delivery of the
Original Indenture or thereafter became or hereafter becomes subject to the Lien of any Class A Mortgage, the Lien of the Indenture shall at all times be junior, subject and subordinate to the Lien of such Class A Mortgage; 

IN TRUST, NEVERTHELESS, for the equal and proportionate benefit and security of the Holders from time to time of all Outstanding
Securities without any priority of any such Security over any other such Security; 
 PROVIDED, HOWEVER, that the right, title and
interest of the Trustee in and to the Mortgaged Property shall cease, terminate and become void in accordance with, and subject to the conditions set forth in, Article Nine of the Original Indenture, and if, thereafter, the principal of and premium,
if any, and interest, if any, on the Securities shall have been paid to the Holders thereof, or shall have been paid to the Company pursuant to Section 603 of the Original Indenture, then and in that case the Indenture shall terminate, and the
Trustee shall execute and deliver to the Company such instruments as the Company shall require to evidence such termination; otherwise the Indenture, and the estate and rights thereby granted shall be and remain in full force and effect; and 

THE PARTIES HEREBY FURTHER COVENANT AND AGREE as follows: 

ARTICLE ONE 
 Securities
of Series No. 35 
 There are hereby established the Securities of Series No. 35, which shall have the terms and
characteristics set forth below (the lettered subdivisions set forth below corresponding to the lettered subdivisions of Section 301 of the Original Indenture): 

(a) the title of the Securities of Series No. 35 shall be “2.70% First Mortgage Bonds, Series No. 35 due 2051”; 

(b) the Securities of Series No. 35 shall initially be authenticated and delivered in the aggregate principal amount of $375,000,000. The
Securities of Series No. 35 may be reopened and additional Securities of Series No. 35 may be issued in excess of the amount initially authenticated and delivered, provided that such additional Securities of Series No. 35 will contain
the same terms (including the Stated Maturity and interest payment terms) as the other Securities of Series No. 35, except for the price to the public, the issue date, and if applicable, the first interest accrual and payment dates. Any such
additional Securities of Series No. 35, together with the Securities of Series No. 35 initially authenticated, shall constitute a single series for purposes of the Indenture and shall be limited to an aggregate principal amount of
$1,000,000,000; 
 (c) interest on the Securities of Series No. 35 shall be payable to the Persons in whose names such Securities are
registered at the close of business on the Regular Record Date for such interest, except as otherwise expressly provided in the form of such Securities attached as Exhibit A hereto; 

  
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 (d) the principal of the Securities of Series No. 35 shall be payable on
January 15, 2051, the Stated Maturity for Series No. 35; 
 (e) the Securities of Series No. 35 shall bear interest at a rate
of 2.70% per annum; interest shall accrue on the Securities of Series No. 35 from May 15, 2020 or the most recent date to which interest has been paid or duly provided for; the Interest Payment Dates for such Securities shall be
January 15 and July 15 in each year, commencing January 15, 2021, and the Regular Record Dates with respect to the Interest Payment Dates for such Securities shall be January 1 and July 1 in each year, respectively (whether
or not a Business Day); 
 (f) the Corporate Trust Office of U.S. Bank National Association in New York, New York shall be the place at which
(i) the principal of, premium, if any, and interest, if any, on the Securities of Series No. 35 shall be payable, (ii) registration of transfer of such Securities may be effected, (iii) exchanges of such Securities may be
effected and (iv) notices and demands to or upon the Company in respect of such Securities and the Indenture may be served; and U.S. Bank National Association shall be the Security Registrar for such Securities; provided, however, that the
Company reserves the right to change, by one or more Officer’s Certificates, any such place or the Security Registrar; and provided, further, that the Company reserves the right to designate, by one or more Officer’s Certificates, its
principal office in Denver, Colorado, as any such place or itself as the Security Registrar; 
 (g) the Securities of Series No. 35
shall be redeemable at the option of the Company at any time prior to July 15, 2050 (which is the date that is six months prior to the Stated Maturity (hereinafter called the “2051 Par Call Date”)), in whole or in part,
at a “make whole” redemption price equal to the greater of (i) 100% of the principal amount thereof to be redeemed and (ii) the sum of the present values of the remaining scheduled payments of principal and interest on such Securities
to be redeemed that would be due if such Securities matured on the 2051 Par Call Date (excluding the portion of any such accrued and unpaid interest to but excluding the Redemption Date), discounted to but excluding the Redemption Date on a
semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 25 basis points plus, in each case, accrued and unpaid interest
thereon to but excluding the Redemption Date. At any time on or after the 2051 Par Call Date, the Company may redeem, in whole or in part, the Securities of Series No. 35 at 100% of the principal amount being redeemed plus accrued and unpaid
interest thereon to but excluding the Redemption Date. 
 For purposes hereof, the following defined terms shall have the
meaning ascribed to them: 
 “Comparable Treasury Issue” means the United States Treasury security selected by an
Independent Investment Banker as having a maturity comparable to the remaining term of the Securities of Series No. 35 (assuming, for this purpose, that the Securities of Series No. 35 matured on the 2051 Par Call Date) that would be
utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of the Securities of Series No. 35. 

  
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 “Comparable Treasury Price” means with respect to any redemption
date of the Securities of Series No. 35 (i) the average of the Reference Treasury Dealer Quotations for the Redemption Date, after excluding the highest and lowest of such Reference Treasury Dealer Quotations for such Redemption Date, or
(ii) if the Independent Investment Banker obtains fewer than four of such Reference Treasury Dealer Quotations for the Redemption Date, the average of all of the Reference Treasury Dealer Quotations for such Redemption Date. 

“Independent Investment Banker” means one of the Reference Treasury Dealers appointed by the Trustee after
consultation with the Company. 
 “Primary Treasury Dealer” means any primary U.S. Government securities dealer in
the United States. 
 “Reference Treasury Dealer” means (1) each of J.P. Morgan Securities LLC and TD
Securities (USA) LLC, and a Primary Treasury Dealer selected by each of CIBC World Markets Corp. and KeyBanc Capital Markets Inc. and any other Primary Treasury Dealer designated by, and not affiliated with, CIBC World Markets Corp., J.P. Morgan
Securities LLC, KeyBanc Capital Markets Inc. and TD Securities (USA) LLC, or their respective affiliates or successors, provided, however, that if any of the foregoing or any of their respective designees, ceases to be a Primary Treasury Dealer, the
Company will appoint another Primary Treasury Dealer as a substitute and (2) any other Primary Treasury Dealer selected by the Company after consultation with an Independent Investment Banker. 

“Reference Treasury Dealer Quotations” means, for any Reference Treasury Dealer and any Redemption Date, the average,
as determined by an Independent Investment Banker, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to an Independent Investment Banker by the Reference
Treasury Dealer at 5:00 p.m., New York City time, on the third Business Day preceding the Redemption Date. 
 “Treasury
Rate” means, with respect to any Redemption Date, the rate per annum equal to the semi-annual equivalent yield to maturity of the Comparable Treasury Issue, calculated using a price for such Comparable Treasury Issue (expressed as a percentage
of its principal amount) equal to the Comparable Treasury Price for such Redemption Date. The Treasury Rate will be calculated on the third Business Day preceding such Redemption Date. 

The provisions of Sections 501, 502, 503, 504, 505 and 506 of the Original Indenture shall be applicable to the Securities of
Series No. 35, except that (i) the notice of redemption required to be provided to Holders pursuant to Section 504 shall be provided not less than 10 nor more than 60 days prior to the Redemption Date and (ii) the notice of
redemption to be provided by the Company to the Trustee pursuant to Section 502 shall be provided at least twenty-five (25) days prior to the Redemption Date (unless a shorter notice period shall be satisfactory to the Trustee). 

(h) not applicable; 
 (i) the
Securities of Series No. 35 shall be issuable only in denominations of $2,000 and integral multiples of $1,000 in excess thereof; 
 (j)
not applicable; 
 (k) not applicable; 

  
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 (l) not applicable; 

(m) not applicable; 
 (n) not
applicable; 
 (o) not applicable; 

(p) not applicable; 
 (q) the
Securities of Series No. 35 are to be initially registered in the name of Cede & Co., as nominee for The Depository Trust Company (the “Depositary”). Such Securities shall not be transferable or exchangeable,
nor shall any purported transfer be registered, except as follows: 
 (i) such Securities may be transferred in whole, and appropriate
registration of transfer effected, if such transfer is by such nominee 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) such Securities may be exchanged for definitive Securities
registered in the respective names of the beneficial holders thereof, and thereafter shall be transferable without restriction, 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 such Securities or the Depositary has ceased to be a
clearing agency registered under the Securities Exchange Act of 1934, as amended, 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 such
Securities; or 
 (B) the Company shall have delivered to the Trustee a Company Order to the effect that such 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 1102 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; 

(r) not applicable; 
 (s) no
service charge shall be made for the registration of transfer or exchange of the Securities of Series No. 35; provided, however, that the Company may require payment of a sum sufficient to cover any tax or other governmental charge payable in
connection with the exchange or transfer; 

  
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 (t) not applicable; 

 

	 	(u)	 (i) If the Company shall have caused the Company’s indebtedness in respect of any Securities of Series
No. 35, to have been satisfied and discharged prior to the Maturity of such Securities, as provided in Section 901 of the Original Indenture, the Company shall, promptly after the date of such satisfaction and discharge, give a notice to
each Person who was a Holder of any of such Securities on such date stating (A)(1) the aggregate principal amount of such Securities and (2) the aggregate amount of any money (other than amounts, if any, deposited in respect of accrued interest
on such Securities) and the aggregate principal amount of, the rate or rates of interest on, and the aggregate fair market value of, any Eligible Obligations deposited pursuant to Section 901 of the Original Indenture with respect to such
Securities and (B) that the Company will provide (and the Company shall promptly so provide) to such Person, or any beneficial owner of such Securities holding through such Person (upon written request to the Company sent to an address
specified in such notice), such other information as such Person or beneficial owner, as the case may be, reasonably may request in order to enable it to determine the federal income tax consequences to it resulting from the satisfaction and
discharge of the Company’s indebtedness in respect of such Securities. Thereafter, the Company shall, within forty-five (45) days after the end of each calendar year, give to each Person who at any time during such calendar year was a
Holder of such Securities a notice containing (X) such information as may be necessary to enable such Person to report its income, gain or loss for federal income tax purposes with respect to such Securities or the assets held on deposit in
respect thereof during such calendar year or the portion thereof during which such Person was a Holder of such Securities, as the case may be (such information to be set forth for such calendar year as a whole and for each month during such year)
and (Y) a statement to the effect that the Company will provide (and the Company shall promptly so provide) to such Person, or any beneficial owner of such Securities holding through such Person (upon written request to the Company sent to an
address specified in such notice), such other information as such Person or beneficial owner, as the case may be, reasonably may request in order to enable it to determine its income, gain or loss for federal income tax purposes with respect to such
Securities or such assets for such year or portion thereof, as the case may be. The obligation of the Company to provide or cause to be provided information for purposes of income tax reporting by any Person as described in the first two sentences
of this paragraph shall be deemed to have been satisfied to the extent that the Company has provided or caused to be provided substantially comparable information pursuant to any requirements of the Internal Revenue Code of 1986, as amended from
time to time (the “Code”) and United States Treasury regulations thereunder. 


 (ii)
Notwithstanding the provisions of subparagraph (i) above, the Company shall not be required to give any notice specified in such subparagraph or to otherwise furnish any of the information contemplated therein if the Company shall have
delivered to the Trustee an Opinion of Counsel to the effect that the Holders of such Securities will not recognize income, gain or loss for federal income tax purposes as a result of the satisfaction and discharge of the Company’s indebtedness
in respect of such Securities and such Holders will be subject to federal income taxation on the same amounts and in the same manner and at the same times as if such satisfaction and discharge had not occurred. 

  
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 (iii) Anything in this clause (u) to the contrary notwithstanding, the Company shall
not be required to give any notice specified in subparagraph (i) or to otherwise furnish the information contemplated therein or to deliver any Opinion of Counsel contemplated by subparagraph (ii) if the Company shall have caused
Securities of Series No. 35 to be deemed to have been paid for purposes of the Indenture, as provided in Section 901 of the Original Indenture, but shall not have effected the satisfaction and discharge of its indebtedness in respect of
such Securities pursuant to such Section. 
 (v) The Securities of Series No. 35 shall be substantially in the form attached hereto as
Exhibit A, and shall have such further terms as are set forth in such form. 
 ARTICLE TWO 

Securities of Series No. 36 

There are hereby established the Securities of Series No. 36, which shall have the terms and characteristics set forth below (the
lettered subdivisions set forth below corresponding to the lettered subdivisions of Section 301 of the Original Indenture): 
 (a) the
title of the Securities of Series No. 36 shall be “1.90% First Mortgage Bonds, Series No. 36 due 2031”; 
 (b) the
Securities of Series No. 36 shall initially be authenticated and delivered in the aggregate principal amount of $375,000,000. The Securities of Series No. 36 may be reopened and additional Securities of Series No. 36 may be issued in
excess of the amount initially authenticated and delivered, provided that such additional Securities of Series No. 36 will contain the same terms (including the Stated Maturity and interest payment terms) as the other Securities of Series
No. 36, except for the price to the public, the issue date, and if applicable, the first interest accrual and payment dates. Any such additional Securities of Series No. 36, together with the Securities of Series No. 36 initially
authenticated, shall constitute a single series for purposes of the Indenture and shall be limited to an aggregate principal amount of $1,000,000,000; 

(c) interest on the Securities of Series No. 36 shall be payable to the Persons in whose names such Securities are registered at the close
of business on the Regular Record Date for such interest, except as otherwise expressly provided in the form of such Securities attached as Exhibit B hereto; 

(d) the principal of the Securities of Series No. 36 shall be payable on January 15, 2031, the Stated Maturity for Series
No. 36; 
 (e) the Securities of Series No. 36 shall bear interest at a rate of 1.90% per annum; interest shall accrue on the
Securities of Series No. 36 from May 15, 2020 or the most recent date to which interest has been paid or duly provided for; the Interest Payment Dates for such Securities shall be January 15 and July 15 in each year, commencing
January 15, 2021, and the Regular Record Dates with respect to the Interest Payment Dates for such Securities shall be January 1 and July 1 in each year, respectively (whether or not a Business Day); 

  
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 (f) the Corporate Trust Office of U.S. Bank National Association in New York, New York shall
be the place at which (i) the principal of, premium, if any, and interest, if any, on the Securities of Series No. 36 shall be payable, (ii) registration of transfer of such Securities may be effected, (iii) exchanges of such
Securities may be effected and (iv) notices and demands to or upon the Company in respect of such Securities and the Indenture may be served; and U.S. Bank National Association shall be the Security Registrar for such Securities; provided,
however, that the Company reserves the right to change, by one or more Officer’s Certificates, any such place or the Security Registrar; and provided, further, that the Company reserves the right to designate, by one or more Officer’s
Certificates, its principal office in Denver, Colorado, as any such place or itself as the Security Registrar; 
 (g) the Securities of
Series No. 36 shall be redeemable at the option of the Company at any time prior to July 15, 2030 (which is the date that is six months prior to the Stated Maturity (hereinafter called the “2031 Par Call Date”)), in
whole or in part, at a “make whole” redemption price equal to the greater of (i) 100% of the principal amount thereof to be redeemed and (ii) the sum of the present values of the remaining scheduled payments of principal and interest
on such Securities to be redeemed that would be due if such Securities matured on the 2031 Par Call Date (excluding the portion of any such accrued and unpaid interest to but excluding the Redemption Date), discounted to but excluding the Redemption
Date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 20 basis points plus, in each case, accrued and unpaid
interest thereon to but excluding the Redemption Date. At any time on or after the 2031 Par Call Date, the Company may redeem, in whole or in part, the Securities of Series No. 36 at 100% of the principal amount being redeemed plus accrued and
unpaid interest thereon to but excluding the Redemption Date. 
 For purposes hereof, the following defined terms shall have
the meaning ascribed to them: 
 “Comparable Treasury Issue” means the United States Treasury security selected by
an Independent Investment Banker as having a maturity comparable to the remaining term of the Securities of Series No. 36 (assuming, for this purpose, that the Securities of Series No. 36 matured on the 2031 Par Call Date) that would be
utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of the Securities of Series No. 36. 

“Comparable Treasury Price” means with respect to any redemption date of the Securities of Series No. 36 (i) the
average of the Reference Treasury Dealer Quotations for the Redemption Date, after excluding the highest and lowest of such Reference Treasury Dealer Quotations for such Redemption Date, or (ii) if the Independent Investment Banker obtains
fewer than four of such Reference Treasury Dealer Quotations for the Redemption Date, the average of all of the Reference Treasury Dealer Quotations for such Redemption Date. 

“Independent Investment Banker” means one of the Reference Treasury Dealers appointed by the Trustee after
consultation with the Company. 
 “Primary Treasury Dealer” means any primary U.S. Government securities dealer in
the United States. 

  
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 “Reference Treasury Dealer” means (1) each of J.P. Morgan
Securities LLC and TD Securities (USA) LLC, and a Primary Treasury Dealer selected by each of CIBC World Markets Corp. and KeyBanc Capital Markets Inc. and any other Primary Treasury Dealer designated by, and not affiliated with, CIBC World Markets
Corp., J.P. Morgan Securities LLC, KeyBanc Capital Markets Inc. and TD Securities (USA) LLC, or their respective affiliates or successors, provided, however, that if any of the foregoing or any of their respective designees, ceases to be a Primary
Treasury Dealer, the Company will appoint another Primary Treasury Dealer as a substitute and (2) any other Primary Treasury Dealer selected by the Company after consultation with an Independent Investment Banker. 

“Reference Treasury Dealer Quotations” means, for any Reference Treasury Dealer and any Redemption Date, the average,
as determined by an Independent Investment Banker, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to an Independent Investment Banker by the Reference
Treasury Dealer at 5:00 p.m., New York City time, on the third Business Day preceding the Redemption Date. 
 “Treasury
Rate” means, with respect to any Redemption Date, the rate per annum equal to the semi-annual equivalent yield to maturity of the Comparable Treasury Issue, calculated using a price for such Comparable Treasury Issue (expressed as a percentage
of its principal amount) equal to the Comparable Treasury Price for such Redemption Date. The Treasury Rate will be calculated on the third Business Day preceding such Redemption Date. 

The provisions of Sections 501, 502, 503, 504, 505 and 506 of the Original Indenture shall be applicable to the Securities of
Series No. 36, except that (i) the notice of redemption required to be provided to Holders pursuant to Section 504 shall be provided not less than 10 nor more than 60 days prior to the Redemption Date and (ii) the notice of
redemption to be provided by the Company to the Trustee pursuant to Section 502 shall be provided at least twenty-five (25) days prior to the Redemption Date (unless a shorter notice period shall be satisfactory to the Trustee). 

(h) not applicable; 
 (i) the
Securities of Series No. 36 shall be issuable only in denominations of $2,000 and integral multiples of $1,000 in excess thereof; 
 (j)
not applicable; 
 (k) not applicable; 

(l) not applicable; 
 (m) not
applicable; 
 (n) not applicable; 

(o) not applicable; 
 (p) not
applicable; 

  
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 (q) the Securities of Series No. 36 are to be initially registered in the name of
Cede & Co., as nominee for The Depository Trust Company (the “Depositary”). Such Securities shall not be transferable or exchangeable, nor shall any purported transfer be registered, except as follows: 

(i) such Securities may be transferred in whole, and appropriate registration of transfer effected, if such transfer is by such nominee 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) such Securities may be exchanged for definitive Securities registered in the respective names of the beneficial holders thereof, and
thereafter shall be transferable without restriction, 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 such Securities or the Depositary has ceased to be a clearing agency registered under the Securities Exchange Act of 1934, as
amended, 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 such Securities; or 

(B) the Company shall have delivered to the Trustee a Company Order to the effect that such 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 1102 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; 
 (r) not
applicable; 
 (s) no service charge shall be made for the registration of transfer or exchange of the Securities of Series No. 36;
provided, however, that the Company may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection with the exchange or transfer; 

(t) not applicable; 
  

	 	(u)	 (i) If the Company shall have caused the Company’s indebtedness in respect of any Securities of Series
No. 36, to have been satisfied and discharged prior to the Maturity of such Securities, as provided in Section 901 of the Original Indenture, the Company shall, promptly after the date of such satisfaction and discharge, give a notice to
each Person who was a Holder of any of such Securities on such date stating (A)(1) the aggregate principal amount of such Securities and (2) the aggregate amount of any money (other than amounts, if any, deposited in respect of accrued interest
on such Securities) and the aggregate principal amount of, the rate or rates of interest on, and the aggregate fair market value of, any Eligible Obligations deposited pursuant to Section 901 of the Original Indenture with respect to such
Securities and (B) that the Company will provide (and the Company shall promptly so provide) to such Person, or any beneficial owner of such Securities holding through such Person (upon written request to the Company




  
 11 














	 	
sent to an address specified in such notice), such other information as such Person or beneficial owner, as the case may be, reasonably may request in order to enable it to determine the federal
income tax consequences to it resulting from the satisfaction and discharge of the Company’s indebtedness in respect of such Securities. Thereafter, the Company shall, within forty-five (45) days after the end of each calendar year, give
to each Person who at any time during such calendar year was a Holder of such Securities a notice containing (X) such information as may be necessary to enable such Person to report its income, gain or loss for federal income tax purposes with
respect to such Securities or the assets held on deposit in respect thereof during such calendar year or the portion thereof during which such Person was a Holder of such Securities, as the case may be (such information to be set forth for such
calendar year as a whole and for each month during such year) and (Y) a statement to the effect that the Company will provide (and the Company shall promptly so provide) to such Person, or any beneficial owner of such Securities holding through
such Person (upon written request to the Company sent to an address specified in such notice), such other information as such Person or beneficial owner, as the case may be, reasonably may request in order to enable it to determine its income, gain
or loss for federal income tax purposes with respect to such Securities or such assets for such year or portion thereof, as the case may be. The obligation of the Company to provide or cause to be provided information for purposes of income tax
reporting by any Person as described in the first two sentences of this paragraph shall be deemed to have been satisfied to the extent that the Company has provided or caused to be provided substantially comparable information pursuant to any
requirements of the Internal Revenue Code of 1986, as amended from time to time (the “Code”) and United States Treasury regulations thereunder. 


(ii) Notwithstanding the provisions of subparagraph (i) above, the Company shall not be required to give any notice specified in such
subparagraph or to otherwise furnish any of the information contemplated therein if the Company shall have delivered to the Trustee an Opinion of Counsel to the effect that the Holders of such Securities will not recognize income, gain or loss for
federal income tax purposes as a result of the satisfaction and discharge of the Company’s indebtedness in respect of such Securities and such Holders will be subject to federal income taxation on the same amounts and in the same manner and at
the same times as if such satisfaction and discharge had not occurred. 
 (iii) Anything in this clause (u) to the contrary
notwithstanding, the Company shall not be required to give any notice specified in subparagraph (i) or to otherwise furnish the information contemplated therein or to deliver any Opinion of Counsel contemplated by subparagraph (ii) if the
Company shall have caused Securities of Series No. 36 to be deemed to have been paid for purposes of the Indenture, as provided in Section 901 of the Original Indenture, but shall not have effected the satisfaction and discharge of its
indebtedness in respect of such Securities pursuant to such Section. 
 (v) The Securities of Series No. 36 shall be substantially in
the form attached hereto as Exhibit B, and shall have such further terms as are set forth in such form. 

  
 12 













 ARTICLE THREE 

Miscellaneous Provisions 

This Supplemental Indenture No. 31 is a supplement to the Original Indenture. As previously supplemented and further supplemented by this
Supplemental Indenture No. 31, the Original Indenture is in all respects ratified, approved and confirmed, and the Original Indenture, all previous supplements thereto and this Supplemental Indenture No. 31 shall together constitute one
and the same instrument. 

  
 13 













 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture
No. 31 to be duly executed as of the day and year first above written. 
  

			
	PUBLIC SERVICE COMPANY OF COLORADO
		
	By:	 	 /s/ Sarah W. Soong

		 	Name: Sarah W. Soong
		 	Title: Vice President and Treasurer


  

			
	STATE OF MINNESOTA	 	)
		 	) ss:
	COUNTY OF SCOTT	 	)

 The foregoing was acknowledged before me this 4th day of
May, 2020, by Sarah W. Soong, the Vice President and Treasurer of Public Service Company of Colorado, a corporation organized under the laws of Colorado, on behalf of the corporation. 

Witness my hand and official seal. 

My commission expires: January 31, 2021 
  

			
	 /s/ Kristin Lynn Westlund

	Name:	 	Kristin Lynn Westlund
		 	Notary Public, State of Minnesota


 [Signature Page – Supplemental Indenture (PSCo)] 












 
			
	U.S. BANK NATIONAL ASSOCIATION,
	Trustee                             
		
	By:	 	 /s/ Joshua A. Hahn

		 	Name: Joshua A. Hahn
		 	Title: Vice President


  

			
	STATE OF MINNESOTA	 	)
		 	) ss:
	COUNTY OF Ramsey	 	)

 On the 6th day of May, 2020, before me personally came
Joshua A. Hahn, to me known, who, being by me duly sworn, did depose and say that he is a Vice President of U.S. Bank National Association, the banking association described in and which executed the foregoing instrument; and that he signed his name
thereto by authority of the Board of Directors of said banking association. 
  

	
	 /s/ Judy Ann Galberth

	Name: Judy Ann Galberth
	Notary Public, State of Minnesota



  
 [Signature Page –
Supplemental Indenture (Trustee)] 













 EXHIBIT A 

FORM OF SECURITY 
 (See legend at
the end of this Security for 
 restrictions on transfer) 

PUBLIC SERVICE COMPANY OF COLORADO 

First Mortgage Bond, Series No. 35 
  

			
	 Original Interest Accrual Date

Interest Rate:
 Stated Maturity:

Interest Payment Dates:
 Regular
Record Dates:
	    	 May 15, 2020
 2.70% per annum

January 15, 2051
 January 15 and July 15

January 1 and July 1



 This Security is not a Discount Security 

within the meaning of the within-mentioned Indenture 

 
  

 

			
	Principal Amount	  	Registered No.    

 $     

PUBLIC SERVICE COMPANY OF COLORADO, a corporation duly organized and existing under the laws of the State of Colorado (herein called the
“Company,” which term includes any successor corporation under the Indenture referred to below), for value received, hereby promises to pay to ______________, or registered assigns, the principal sum of ____________ Dollars
on the Stated Maturity specified above, and to pay interest thereon from the Original Interest Accrual Date specified above or from the most recent Interest Payment Date to which interest has been paid or duly provided for, semi-annually in arrears on the Interest Payment Dates specified above in each year, commencing January 15, 2021 and at Maturity, at the Interest Rate per annum specified above, until the principal hereof is
paid or duly provided for. The interest so payable, and paid or duly provided for, on any Interest Payment Date shall, as provided in such Indenture, be paid to the Person in whose name this Security (or one or more Predecessor Securities) is
registered at the close of business on the Regular Record Date specified above (whether or not a Business Day) next preceding such Interest Payment Date. Notwithstanding the foregoing, interest payable at Maturity shall be paid to the Person to whom
principal shall be paid. Except as otherwise provided in said Indenture, any such interest not so paid or duly provided for shall forthwith cease to be payable to the Holder on such Regular Record Date and may either be paid to the Person in whose
name this Security (or one or more Predecessor Securities) is registered at the close of business on a Special Record Date for the payment of such Defaulted Interest to be fixed by the Trustee, notice of which shall be given to Holders of Securities
of this series not less than 15 days prior to such Special Record Date, or be paid in such other manner as permitted by the Indenture. 

  
 EXHIBIT A-1 













 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 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 October 1, 1993 (such Indenture as
originally executed and delivered and 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 National Association as successor 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 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 or Stated Maturity, as the case may be, to such Business Day. 

This Security shall be redeemable at the option of the Company at any time prior to July 15, 2050 (which is the date that is six months
prior to the Stated Maturity (herein called the “Par Call Date”)), in whole or in part, at a “make whole” redemption price equal to the greater of (i) 100% of the principal amount hereof to be redeemed and
(ii) the sum of the present values of the remaining scheduled payments of principal and interest on this Security to be redeemed that would be due if this Security matured on the Par Call Date (excluding the portion of any such accrued and
unpaid interest to but excluding the Redemption Date), discounted to but excluding the Redemption Date on a semi-annual basis (assuming a 360-day year consisting of twelve
30-day months) at the Treasury Rate plus 25 basis points, plus, in each case, accrued and unpaid interest thereon to but excluding the Redemption Date. At any time on or after the Par Call Date, the Securities
shall be redeemable, in whole or in part, at 100% of the principal amount being redeemed plus accrued and unpaid interest thereon to but excluding the Redemption Date. For purposes hereof, the following defined terms shall have the meaning ascribed
to them: 
 “Comparable Treasury Issue” means the United States Treasury security selected by an Independent Investment Banker as
having a maturity comparable to the remaining term of this Security (assuming, for this purpose, that this Security matured on the Par Call Date) that would be utilized, at the time of selection and in accordance with customary financial practice,
in pricing new issues of corporate debt securities of comparable maturity to the remaining term of this Security. 
 “Comparable
Treasury Price” means with respect to any redemption date of this Security (i) the average of the Reference Treasury Dealer Quotations for the Redemption Date, after excluding the highest and lowest of such Reference Treasury Dealer
Quotations for such Redemption Date, or (ii) if the Independent Investment Banker obtains fewer than four of such Reference Treasury Dealer Quotations for the Redemption Date, the average of all of the Reference Treasury Dealer Quotations for
such Redemption Date. 

  
 EXHIBIT A-2 













 “Independent Investment Banker” means one of the Reference Treasury Dealers
appointed by the Trustee after consultation with the Company. 
 “Primary Treasury Dealer” means any primary U.S. Government
securities dealer in the United States. 
 “Reference Treasury Dealer” means (1) each of J.P. Morgan Securities LLC and TD
Securities (USA) LLC, and a Primary Treasury Dealer selected by each of CIBC World Markets Corp. and KeyBanc Capital Markets Inc. and any other Primary Treasury Dealer designated by, and not affiliated with, CIBC World Markets Corp., J.P. Morgan
Securities LLC, KeyBanc Capital Markets Inc. and TD Securities (USA) LLC, or their respective affiliates or successors, provided, however, that if any of the foregoing, or any of their respective designees ceases to be a Primary Treasury Dealer, the
Company will appoint another Primary Treasury Dealer as a substitute and (2) any other Primary Treasury Dealer selected by the Company after consultation with an Independent Investment Banker. 

“Reference Treasury Dealer Quotations” means, for any Reference Treasury Dealer and any Redemption Date, the average, as determined
by an Independent Investment Banker, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to an Independent Investment Banker by the Reference Treasury
Dealer at 5:00 p.m., New York City time, on the third Business Day preceding the Redemption Date. 
 “Treasury Rate” means, with
respect to any Redemption Date, the rate per annum equal to the semi-annual equivalent yield to maturity of the Comparable Treasury Issue, calculated using a price for such Comparable Treasury Issue (expressed as a percentage of its principal
amount) equal to the Comparable Treasury Price for such Redemption Date. The Treasury Rate will be calculated on the third Business Day preceding such 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. 

  
 EXHIBIT A-3 













 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 Trust Office of U.S. Bank 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 only 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 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
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, which is not a day on which banking institutions or
trust companies 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 authorized or required by law, regulation 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. 

  
 EXHIBIT A-4 













 As provided in the Indenture, no recourse shall be had for the payment of the principal of
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. 

  
 EXHIBIT A-5 













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

 

			
	PUBLIC SERVICE COMPANY OF COLORADO
		
	By:	 	  

		 	[Vice President and Treasurer]


  

			
	Attest:	 	  

		 	Assistant Secretary

 CERTIFICATE OF AUTHENTICATION 

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

Dated:                         
        
  

					
	 U.S. BANK

NATIONAL ASSOCIATION,
 as
Trustee
	  	OR	  	 U.S. BANK

NATIONAL ASSOCIATION,
 as
Trustee


  

									
	By	 	  
	  		 	By:	  	  

		 	Authorized Officer	  		 		  	as Authenticating Agent
					
		 		  		 	By:	  	  

		 		  		 		  	Authorized Officer

 Unless this certificate is presented by an authorized representative of The Depository Trust Company, a
limited-purpose trust company organized under the New York Banking Law (“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 The Depository Trust Company (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 

  
 EXHIBIT A-6 













 
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 1102 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 PUBLIC SERVICE COMPANY OF
COLORADO 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. 

  
 EXHIBIT A-7 













 EXHIBIT B 

FORM OF SECURITY 
 (See legend at
the end of this Security for 
 restrictions on transfer) 

PUBLIC SERVICE COMPANY OF COLORADO 

First Mortgage Bond, Series No. 36 
  

			
	 Original Interest Accrual Date

Interest Rate:
 Stated Maturity:

Interest Payment Dates:
 Regular
Record Dates:
	    	 May 15, 2020
 1.90% per annum

January 15, 2031
 January 15 and July 15

January 1 and July 1



 This Security is not a Discount Security 

within the meaning of the within-mentioned Indenture 

 
  

 

			
	Principal Amount	  	Registered No.    

 $     

PUBLIC SERVICE COMPANY OF COLORADO, a corporation duly organized and existing under the laws of the State of Colorado (herein called the
“Company,” which term includes any successor corporation under the Indenture referred to below), for value received, hereby promises to pay to ______________, or registered assigns, the principal sum of ____________ Dollars
on the Stated Maturity specified above, and to pay interest thereon from the Original Interest Accrual Date specified above or from the most recent Interest Payment Date to which interest has been paid or duly provided for, semi-annually in arrears on the Interest Payment Dates specified above in each year, commencing January 15, 2021 and at Maturity, at the Interest Rate per annum specified above, until the principal hereof is
paid or duly provided for. The interest so payable, and paid or duly provided for, on any Interest Payment Date shall, as provided in such Indenture, be paid to the Person in whose name this Security (or one or more Predecessor Securities) is
registered at the close of business on the Regular Record Date specified above (whether or not a Business Day) next preceding such Interest Payment Date. Notwithstanding the foregoing, interest payable at Maturity shall be paid to the Person to whom
principal shall be paid. Except as otherwise provided in said Indenture, any such interest not so paid or duly provided for shall forthwith cease to be payable to the Holder on such Regular Record Date and may either be paid to the Person in whose
name this Security (or one or more Predecessor Securities) is registered at the close of business on a Special Record Date for the payment of such Defaulted Interest to be fixed by the Trustee, notice of which shall be given to Holders of Securities
of this series not less than 15 days prior to such Special Record Date, or be paid in such other manner as permitted by the Indenture. 

  
 EXHIBIT B-1 













 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 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 October 1, 1993 (such Indenture as
originally executed and delivered and 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 National Association as successor 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 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 or Stated Maturity, as the case may be, to such Business Day. 

This Security shall be redeemable at the option of the Company at any time prior to July 15, 2030 (which is the date that is six months
prior to the Stated Maturity (herein called the “Par Call Date”)), in whole or in part, at a “make whole” redemption price equal to the greater of (i) 100% of the principal amount hereof to be redeemed and
(ii) the sum of the present values of the remaining scheduled payments of principal and interest on this Security to be redeemed that would be due if this Security matured on the Par Call Date (excluding the portion of any such accrued and
unpaid interest to but excluding the Redemption Date), discounted to but excluding the Redemption Date on a semi-annual basis (assuming a 360-day year consisting of twelve
30-day months) at the Treasury Rate plus 20 basis points, plus, in each case, accrued and unpaid interest thereon to but excluding the Redemption Date. At any time on or after the Par Call Date, the Securities
shall be redeemable, in whole or in part, at 100% of the principal amount being redeemed plus accrued and unpaid interest thereon to but excluding the Redemption Date. For purposes hereof, the following defined terms shall have the meaning ascribed
to them: 
 “Comparable Treasury Issue” means the United States Treasury security selected by an Independent Investment Banker as
having a maturity comparable to the remaining term of this Security (assuming, for this purpose, that this Security matured on the Par Call Date) that would be utilized, at the time of selection and in accordance with customary financial practice,
in pricing new issues of corporate debt securities of comparable maturity to the remaining term of this Security. 
 “Comparable
Treasury Price” means with respect to any redemption date of this Security (i) the average of the Reference Treasury Dealer Quotations for the Redemption Date, after excluding the highest and lowest of such Reference Treasury Dealer
Quotations for such Redemption Date, or (ii) if the Independent Investment Banker obtains fewer than four of such Reference Treasury Dealer Quotations for the Redemption Date, the average of all of the Reference Treasury Dealer Quotations for
such Redemption Date. 

  
 EXHIBIT B-2 













 “Independent Investment Banker” means one of the Reference Treasury Dealers
appointed by the Trustee after consultation with the Company. 
 “Primary Treasury Dealer” means any primary U.S. Government
securities dealer in the United States. 
 “Reference Treasury Dealer” means (1) each of J.P. Morgan Securities LLC and TD
Securities (USA) LLC, and a Primary Treasury Dealer selected by each of CIBC World Markets Corp. and KeyBanc Capital Markets Inc. and any other Primary Treasury Dealer designated by, and not affiliated with, CIBC World Markets Corp., J.P. Morgan
Securities LLC, KeyBanc Capital Markets Inc. and TD Securities (USA) LLC, or their respective affiliates or successors, provided, however, that if any of the foregoing, or any of their respective designees ceases to be a Primary Treasury Dealer, the
Company will appoint another Primary Treasury Dealer as a substitute and (2) any other Primary Treasury Dealer selected by the Company after consultation with an Independent Investment Banker. 

“Reference Treasury Dealer Quotations” means, for any Reference Treasury Dealer and any Redemption Date, the average, as determined
by an Independent Investment Banker, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to an Independent Investment Banker by the Reference Treasury
Dealer at 5:00 p.m., New York City time, on the third Business Day preceding the Redemption Date. 
 “Treasury Rate” means, with
respect to any Redemption Date, the rate per annum equal to the semi-annual equivalent yield to maturity of the Comparable Treasury Issue, calculated using a price for such Comparable Treasury Issue (expressed as a percentage of its principal
amount) equal to the Comparable Treasury Price for such Redemption Date. The Treasury Rate will be calculated on the third Business Day preceding such 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. 

  
 EXHIBIT B-3 













 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 Trust Office of U.S. Bank 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 only 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 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
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, which is not a day on which banking institutions or
trust companies 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 authorized or required by law, regulation 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. 

  
 EXHIBIT B-4 













 As provided in the Indenture, no recourse shall be had for the payment of the principal of
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. 

  
 EXHIBIT B-5 













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

 

			
	PUBLIC SERVICE COMPANY OF COLORADO
		
	By:	 	  

		 	[Vice President and Treasurer]


  

			
	Attest:	 	  

		 	Assistant Secretary

 CERTIFICATE OF AUTHENTICATION 

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

Dated:                         
    
  

					
	 U.S. BANK

NATIONAL ASSOCIATION,
 as
Trustee
	  	OR	  	 U.S. BANK

NATIONAL ASSOCIATION,
 as
Trustee


  

									
	By	 	  
	  		 	By:	  	  

		 	Authorized Officer	  		 		  	as Authenticating Agent
					
		 		  		 	By:	  	  

		 		  		 		  	Authorized Officer

 Unless this certificate is presented by an authorized representative of The Depository Trust Company, a
limited-purpose trust company organized under the New York Banking Law (“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 The Depository Trust Company (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 

  
 EXHIBIT B-6 













 
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 1102 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 PUBLIC SERVICE COMPANY OF
COLORADO 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. 

  
 EXHIBIT B-7 













 SCHEDULE A 

The following table sets forth recording information relating to the recordation, in each of the specified Colorado counties, of the
Indenture dated as of October 1, 1993, granted by Public Service Company of Colorado to Morgan Guaranty Trust Company of New York, Trustee (recording information for Supplemental Indentures is not shown in this table): 

 

											
	 COUNTY
	  	 DATE
	  	 TIME
	  	 RECEPTION NUMBER
	  	 BOOK/FILM
	  	 PAGE

	Adams	  	Oct. 13, 1993	  	01:35 P.M.	  	Reception No. B1183903	  	Book 4170	  	Page 324
						
	Alamosa	  	Oct. 12, 1993	  	03:00 P.M.	  	Reception No. 265666	  	Book 475	  	Page 160
						
	Arapahoe	  	Oct. 13, 1993	  	04:07 P.M.	  	Reception No. 141032	  	Book 7186	  	Page 383
						
	Archuleta	  	Oct. 12, 1993	  	02:21 P.M.	  	Reception No. 93006202	  		  	
						
	Baca	  	May 16, 2013	  	09:50 A.M.	  	Reception No. 418754	  		  	
						
	Bent	  	Oct. 12, 1993	  	11:35 A.M.	  	Reception No. 278521	  	Book 435	  	Page 1
						
	Boulder	  	Oct. 13, 1993	  	03:04 P.M.	  	Reception No. 01347991	  	Film 1888	  	
						
	Broomfield	  	May 10, 2019	  	10:20 A.M.	  	Reception No. 2019004811	  		  	
						
	Chaffee	  	Oct. 14, 1993	  	11:00 A.M.	  	Reception No. 269673	  	Book 539	  	Page 518
						
	Cheyenne	  	May 15, 2013	  	11:39 A.M.	  	Reception No. 236363	  		  	
						
	Clear Creek	  	Oct. 12, 1993	  	02:25 P.M.	  	Reception No. 163701	  	Book 505	  	Page 631
						
	Conejos	  	Oct. 13, 1993	  	09:56 A.M.	  	Reception No. 205693	  	Book 354	  	Page 776
						
	Costilla	  	Oct. 13, 1993	  	09:00 A.M.	  	Reception No. 191898	  	Book 291	  	Page 117
						
	Crowley	  	Oct. 13, 1993	  	08:40 A.M.	  	Reception No. 148850	  	Book 244	  	Page 195
						
	Custer	  	May 15, 2013	  	09:18 A.M.	  	Reception No. 221251	  		  	
						
	Delta	  	Oct. 13, 1993	  	09:37 A.M.	  	Reception No. 471619	  	Book 709	  	Page 50
						
	Denver	  	Oct. 12, 1993	  	11:24 A.M.	  	Reception No. 9300139814	  		  	
						
	Dolores	  	Oct. 14, 1993	  	12:50 P.M.	  	Reception No. 133132	  	Book 260	  	Page 300
						
	Douglas	  	Oct. 12, 1993	  	03:08 P.M.	  	Reception No. 9348340	  	Book 1154	  	Page 1
						
	Eagle	  	Oct. 12, 1993	  	04:48 P.M.	  	Reception No. 518046	  	Book 621	  	Page 978
						
	Elbert	  	Oct. 12, 1993	  	03:01 P.M.	  	Reception No. 313722	  	Book 480	  	Page 183
						
	El Paso	  	Oct. 12, 1993	  	01:38 P.M.	  	Reception No. 002368410	  	Book 6282	  	Page 51
						
	Fremont	  	Oct. 12, 1993	  	01:30 P.M.	  	Reception No. 608790	  	Book 1154	  	Page 31


  
 SCHEDULE A-1 














											
	 COUNTY
	  	 DATE
	  	 TIME
	  	 RECEPTION NUMBER
	  	 BOOK/FILM
	  	 PAGE

						
	Garfield	  	Oct. 12, 1993	  	02:20 P.M.	  	Reception No. 453596	  	Book 878	  	Page 193
						
	Gilpin	  	Oct. 12, 1993	  	02:20 P.M.	  	Reception No. 79260	  	Book 551	  	Page 413
						
	Grand	  	Oct. 12, 1993	  	12:45 P.M.	  	Reception No. 93010260	  		  	
						
	Gunnison	  	Oct. 12, 1993	  	04:30 P.M.	  	Reception No. 446179	  	Book 733	  	Page 1
						
	Hinsdale	  	May 14, 2013	  	05:20 P.M.	  	Reception No. 100157	  		  	
						
	Huerfano	  	Oct. 12, 1993	  	11:15 A.M.	  	Reception No. 9244	  	Book 21M	  	Page 316
						
	Jefferson	  	Oct. 13, 1993	  	09:30 A.M.	  	Reception No. 93163438	  		  	
						
	Kiowa	  	Oct. 12, 1993	  	01:00 P.M.	  	Reception No. 249124	  	Book 409	  	Page 40
						
	Kit Carson	  	May 15, 2013	  	09:40 A.M.	  	Reception No. 201300563130	  		  	
						
	La Plata	  	Oct. 12, 1993	  	03:38 P.M.	  	Reception No. 655580	  		  	
						
	Lake	  	Oct. 12, 1993	  	03:00 P.M.	  	Reception No. 305501	  	Book 506	  	Page 635
						
	Larimer	  	Oct. 13, 1993	  	10:23 A.M.	  	Reception No. 93075587	  		  	
						
	Las Animas	  	May 15, 2013	  	09:24 A.M.	  	Reception No. 201300720666	  		  	
						
	Lincoln	  	May 10, 2019	  	11:33 A.M.	  	Reception No. 351580	  		  	
						
	Logan	  	Oct. 12, 1993	  	01:10 P.M.	  	Reception No. 606328	  	Book 874	  	Page 484
						
	Mesa	  	Oct. 12, 1993	  	12:06 P.M.	  	Reception No. 1656362	  	Book 2014	  	Page 129
						
	Mineral	  	May 16, 2013	  	10:40 A.M.	  	Reception No. 68174	  		  	
						
	Moffat	  	Oct. 12, 1993	  	11:00 A.M.	  	Reception No. 350044	  		  	
						
	Montezuma	  	Oct. 13, 1993	  	10:10 A.M.	  	Reception No. 435373	  	Book 0679	  	Page 756
						
	Montrose	  	Oct. 12, 1993	  	03:06 P.M.	  	Reception No. 591244	  	Book 862;	  	Page 281
						
	Morgan	  	Oct. 12, 1993	  	12:54 P.M.	  	Reception No. 738426	  	Book 959-60	  	Page 857
						
	Otero	  	May 15, 2013	  	08:02 A.M.	  	Reception No. 634927	  		  	
						
	Ouray	  	Oct. 13, 1993	  	11:08 A.M.	  	Reception No. 154688	  	Book 221	  	Page 500
						
	Park	  	Oct. 14, 1993	  	10:00 A.M.	  	Reception No. 417879	  	Book 504	  	Page 365
						
	Pitkin	  	Oct. 14, 1993	  	03:56 P.M.	  	Reception No. 362054	  	Book 726	  	Page 791
						
	Prowers	  	Oct. 12, 1993	  	02:00 P.M.	  	Reception No. 462785	  		  	
						
	Pueblo	  	Oct. 12, 1993	  	11:54 A.M.	  	Reception No. 1021381	  	Book 2685	  	Page 768


  
 SCHEDULE A-2 














											
	 COUNTY
	  	 DATE
	  	 TIME
	  	 RECEPTION NUMBER
	  	 BOOK/FILM
	  	 PAGE

						
	Rio Blanco	  	Oct. 12, 1993	  	02:18 P.M.	  	Reception No. 249980	  	Book 506	  	Page 838
						
	Rio Grande	  	Oct. 13, 1993	  	11:46 A.M.	  	Reception No. 337091	  	Book 450	  	Page 43
						
	Routt	  	Oct. 12, 1993	  	11:12 A.M.	  	Reception No. 428347	  	Book 689	  	Page 2575
						
	Saguache	  	Oct. 13, 1993	  	11:05 A.M.	  	Reception No. 304092	  	Book 486	  	Page 625
						
	San Juan	  	Oct. 13, 1993	  	10:27 A.M.	  	Reception No. 136438	  	Book 240	  	Page 702
						
	San Miguel	  	Oct. 12, 1993	  	04:05 P.M.	  	Reception No. 287896	  	Book 518	  	Page 813
						
	Sedgewick	  	Oct. 12, 1993	  	02:15 P.M.	  	Reception No. 179877	  	Book 203	  	Page 55
						
	Summit	  	Oct. 12, 1993	  	01:40 P.M.	  	Reception No. 453148	  		  	
						
	Teller	  	Oct. 13, 1993	  	08:00 A.M.	  	Reception No. 412373	  	Book 698	  	Page 104
						
	Washington	  	Oct. 12, 1993	  	11:20 A.M.	  	Reception No. 802111	  	Book 925	  	Page 955
						
	Weld	  	Oct. 13, 1993	  	09:54 A.M.	  	Reception No. 2354434	  	Book 1406	  	Page 1
						
	Yuma	  	May 20, 2013	  	11:59 A.M.	  	Reception No. 00557180	  		  	


  
 SCHEDULE A-3 













 SCHEDULE B 

SUPPLEMENTAL INDENTURES 
  

							
	 Date of

Supplemental

Indenture
	    	Series of Bonds	    	Principal Amount Issued	    	Principal
Amount
Outstanding
	 November 1, 1993
	    	Series No. 1	    	$134,500,000	    	None
	 January 1, 1994
	    	Series No. 2 due 2001	    	$102,667,000	    	None
		    	and	    		    	
		    	Series No. 2 due 2024	    	$110,000,000	    	None
	 September 2, 1994
	    	None	    	None	    	None
	 (Appointment of Successor Trustee)
	    		    		    	
	 May 1, 1996
	    	Series No. 3	    	$125,000,000	    	None
	 November 1, 1996
	    	Series No. 4	    	$250,000,000	    	None
	 February 1, 1997
	    	Series No. 5	    	$150,000,000	    	None
	 April 1, 1998
	    	Series No. 6	    	$250,000,000	    	None
	 August 15, 2002
	    	Series No. 7	    	$48,750,000	    	None
	 September 1, 2002
	    	Series No. 8	    	$600,000,000	    	None
	 September 15, 2002
	    	Series No. 9	    	$530,000,000	    	None
	 April 1, 2003
	    	Series No. 10	    	$600,000,000	    	None
	 March 1, 2003
	    	Series No. 11	    	$250,000,000	    	None
	 September 15, 2003
	    	Series No. 12	    	$250,000,000	    	None
	 May 1, 2003
	    	Series No. 13	    	$350,000,000	    	None
	 September 1, 2003
	    	Series No. 14	    	$300,000,000	    	None
	 September 1, 2003
	    	Series No. 15	    	$275,000,000	    	None
	 August 1, 2005
	    	Series No. 16	    	$129,500,000	    	None
	 August 1, 2007
	    	Series No. 17 due 2037	    	$350,000,000	    	$350,000,000
	 August 1, 2008
	    	Series No. 18 due 2018	    	$300,000,000	    	None
		    	and	    		    	
		    	Series No. 19 due 2038	    	$300,000,000	    	$300,000,000
	 May 1, 2009
	    	Series No. 20 due 2019	    	$400,000,000	    	None
	 November 1, 2010
	    	Series No. 21 due 2020	    	$400,000,000	    	$400,000,000
	 August 1, 2011
	    	Series No. 22 due 2041	    	$250,000,000	    	$250,000,000
	 September 1, 2012
	    	Series No. 23 due 2022	    	$300,000,000	    	$300,000,000
		    	and	    		    	
		    	Series No. 24 due 2042	    	$500,000,000	    	$500,000,000
	 March 1, 2013
	    	Series No. 25 due 2023	    	$250,000,000	    	$250,000,000
		    	and	    		    	
		    	Series No. 26 due 2043	    	$250,000,000	    	$250,000,000
	 March 1, 2014
	    	Series No. 27 due 2044	    	$300,000,000	    	$300,000,000
	 May 1, 2015
	    	Series No. 28 due 2025	    	$250,000,000	    	$250,000,000
	 June 1, 2016
	    	Series No. 29 due 2046	    	$250,000,000	    	$250,000,000
	 June 1, 2017
	    	Series No. 30 due 2047	    	$400,000,000	    	$400,000,000
	 June 1, 2018
	    	Series No. 31 due 2028	    	$350,000,000	    	$350,000,000
		    	and	    		    	
		    	Series No. 32 due 2048	    	$350,000,000	    	$350,000,000
	 March 1, 2019
	    	Series No. 33 due 2049	    	$400,000,000	    	$400,000,000
	 August 1, 2019
	    	Series No. 34 due 2050	    	$550,000,000	    	$550,000,000
	 May 1, 2020
	    	Series No. 35 due 2051	    	$375,000,000	    	$375,000,000
		    	and	    		    	
		    	Series No. 36 due 2031	    	$375,000,000	    	$375,000,000


  
 SCHEDULE B-1 













 SCHEDULE C 

DESCRIPTION OF PROPERTY 
 The following
properties are in the State of Colorado and the counties thereof: 
  

	1.	 Titan Site-Waterton Expansion 



A TRACT OF LAND SITUATED IN THE SOUTHWEST 1/4 OF SECTION 25, TOWNSHIP 6 SOUTH, RANGE 69 WEST OF THE 6TH PRINCIPAL MERIDIAN, DOUGLAS COUNTY, COLORADO, MORE
PARTICULARLY DESCRIBED AS FOLLOWS: 
 BEGINNING AT THE NORTHWEST CORNER OF SAID SOUTHWEST 1/4 AND CONSIDERING THE WEST LINE OF SAID SOUTHWEST 1/4 TO BEAR
SOUTH 0 DEGREES 20 MINUTES 18 SECONDS EAST WITH ALL BEARINGS CONTAINED HEREIN RELATIVE THERETO; THENCE SOUTH 0 DEGREES 20 MINUTES 18 SECONDS EAST ALONG SAID WEST LINE A DISTANCE OF 542.53 FEET TO THE NORTHWEST CORNER OF THAT TRACT OF LAND DESCRIBED
IN BOOK 120 AT PAGE 13; THENCE NORTH 89 DEGREES 56 MINUTES 34 SECONDS EAST A DISTANCE OF 990.00 FEET TO THE NORTHEAST CORNER OF SAID DESCRIBED TRACT; THENCE SOUTH 0 DEGREES 20 MINUTES 18 SECONDS EAST ALONG THE EAST LINE OF SAID DESCRIBED TRACT A
DISTANCE OF 730.00 FEET TO THE NORTHWEST CORNER OF THAT TRACT OF LAND DESCRIBED IN BOOK 199 AT PAGE 71; THENCE NORTH 89 DEGREES 56 MINUTES 34 SECONDS EAST A DISTANCE OF 1650.86 FEET TO THE NORTHEAST CORNER OF SAID DESCRIBED TRACT; THENCE NORTH 0
DEGREES 08 MINUTES 52 SECONDS WEST ALONG THE EAST LINE OF SAID SOUTHWEST 1/4 A DISTANCE OF 1276.99 FEET TO THE NORTHEAST CORNER OF SAID SOUTHWEST 1/4; THENCE SOUTH 89 DEGREES 50 MINUTES 46 SECONDS WEST A DISTANCE OF 2645.10 FEET TO THE POINT OF
BEGINNING. 
 Douglas County, Colorado 
  

	2.	 Pronghorn STATCOM 



A PARCEL OF LAND LOCATED IN THE NORTHWEST QUARTER OF SECTION 24, TOWNSHIP 10 SOUTH, RANGE 58 WEST OF THE SIXTH PRINCIPAL MERIDIAN, COUNTY OF ELBERT, STATE OF
COLORADO, SAID PARCEL BEING MORE PARTICULARLY DESCRIBED AS FOLLOWS: 
 BASIS OF BEARING OF THIS DESCRIPTION IS ALONG THE NORTH LINE OF SECTION 24, T10S,
R58W, 6TH P.M., ASSUMED TO BEAR N89°25’52’E, A DISTANCE OF 5249.64 FEET FROM A 2.5” ALUMINUM CAP L.S. #38012 FOUND AT THE NORTHWEST CORNER OF SAID SECTION 24, TO A 2.5” ALUMUNIM CAP L.S. #30127 FOUND AT THE NORTHEAST CORNER
OF SAID SECTION 24. 
 BEGINNING AT THE NORTWEST CORNER OF SECTION 24; 

THENCE N89°25’52’E ALONG SAID NORTH LINE OF SECTION 24, A DISTANCE OF 816.76 FEET; THENCE S00°48’22”E PARALLEL WITH AND 816.75 FEET
EAST OF THE WEST LINE OF SAID NORTHWEST QUARTER OF SECTION 24, A DISTANCE OF 800.01 FEET; THENCE S89°25’52”W PARALLEL WITH AND 800 FEET SOUTH OF SAID NORTH LINE OF SECTION 24, 

  
 SCHEDULE C-1 













 
A DISTANCE OF 816.76 FEET TO SAID WEST LINE OF THE NORTHWEST QUARTER OF SECTION 24; THENCE N00°48’22”W ALONG SAID WEST LINE, A DISTANCE OF 800.01 FEET TO THE POINT OF BEGINNING.

 Elbert County, Colorado 
  

	3.	 NREL Switchyard 



COMMENCING AT THE WEST QUARTER CORNER OF SAID SECTION 9, BEING MONUMENTED BY A FOUND 3-1/4” DIAMETER ALUMINUM CAP
IN A RANGE BOX, 0.1’ BELOW GROUND, STAMPED “COLO DEPT OF TRANSPORTATION T2S R70W 1/4 S8 S9 2004 PLS NO 14599”, WHENCE THE SOUTHWEST CORNER OF SAID SECTION 9, BEING MONUMENTED BY A FOUND 4” DIAMETER BRASS CAP STAMPED “WAR
DEPARTMENT CORPS OF ENGINEERS—US ARMY – TRAVERSE STATION NW COR SEC 16, PT 8 RW” BEARS S00°20’50“E A DISTANCE OF 2638.03 FEET; THENCE N 18°54’01“E A DISTANCE OF 34.51 FEET TO THE POINT OF BEGINNING; 

THENCE N62°02’01 “E A DISTANCE OF 30.12 FEET; 

THENCE N85°23’32“E A DISTANCE OF 149.68 FEET; 

THENCE THE FOLLOWING THREE (3) COURSES ALONG THE WESTERLY AND NORTHERLY LINES OF TRACT K “ROCK CREEK INDUSTRIAL PARK” RECORDED AT RECEPTION NO.
87151417 DATED DECEMBER 23, 1987 IN THE JEFFERSON COUNTY CLERK AND RECORDER’S OFFICE, AND THE NORTHERLY PROLONGATION OF THE EASTERLY MOST WESTERLY LINE THEREOF: 

1) S20°17’29“E ALONG THE EASTERLY LINE OF A 100-FOOT WIDE TRANSMISSION LINE 

EASEMENT DESCRIBE IN RIGHT-OF-WAY DEED RECORDED IN BOOK 153 AT PAGE 242 DATED
JANUARY 22, 1909 IN THE JEFFERSON COUNTY CLERK AND RECORDER’S OFFICE A DISTANCE OF 834.97 FEET; 
 2) THENCE S69°42’31“W A DISTANCE
OF 20,00 FEET; 
 3) THENCE S20°17’29“E A DISTANCE OF 172.03 FEET; 

THENCE S69°42’31“W ALONG THE NORTHERLY LINE OF TRACT J SAID “ROCK CREEK INDUSTRIAL PARK” A DISTANCE OF 198.10 FEET; 

THENCE, THE FOLLOWING THREE (3) COURSES ALONG THE EASTERLY AND NORTHERLY LINES OF TRACT I SAID “ROCK CREEK INDUSTRIAL PARK”: 

1) N33°46’54“W TANGENT WITH THE FOLLOWING DESCRIBED CURVE A DISTANCE OF 222.81 FEET; 

2) THENCE ALONG THE ARC OF A CURVE TO THE LEFT HAVING A CENTRAL ANGLE OF 25°00’00”, A RADIUS OF 324.18 FEET, A LONG CHORD WHICH BEARS
N46°16’54“W A DISTANCE OF 140.33 FEET AND AN ARC DISTANCE OF 141.45 FEET; 
 3) THENCE N58°46’54“W TANGENT WITH THE LAST
DESCRIBED CURVE A DISTANCE OF 102.51 FEET; 

  
 SCHEDULE C-2 













 THENCE THE FOLLOWING TWO (2) COURSE ALONG THE EASTERLY LINES OF A PARCEL OF LAND DESCRIBED IN RECEPTION
NO. F0755657 DATED DECEMBER 10, 1998 IN THE JEFFERSON COUNTY CLERK AND RECORDER’S OFFICE: 
 1) N00°18’28“W A DISTANCE OF 87.35 FEET;

 2) THENCE N03°59’48“W A DISTANCE OF 87.95 FEET; 

THENCE N00°06’13“W ALONG THE EASTERLY RIGHT-OF-WAY OF HIGHWAY 93
AS DESCRIBED IN RIGHT-OF-WAY DOCUMENT RECORDED IN BOOK 814 AT PAGE 367 AND AT RECEPTION NO. 553481 DATED JULY 6, 1953 IN THE JEFFERSON COUNTY CLERK AND
RECORDER’S OFFICE A DISTANCE OF 483.60 FEET TO THE POI NT OF BEGINNING; 
 CONTAINING 6.690 ACRES, MORE OR LESS. 

Jefferson County, Colorado 
  

	4.	 Tacoma Hydro-Ute Substation 



TRACT I (A): 
 TOWNSHIP 38 NORTH. RANGE 9 WEST, N.M.P.M., La Plata
County, Colorado: 
 Section 13: NW1/4SE1/4 
 TRACT II
(B): 
 A tract of land located In Section 24, Township 38 North, Range 9 West, N.M.P.M., La Plata County, 

Colorado, being more particularly described as follows: 

BEGINNING at the Northwest Corner of Section 24, thence South 87° 17’ 25” East, a distance of 1310.92 feet to the West 1/16 Corner common
to Section 13 and Section 24, thence South 87° 17’41” East, along the north line of the NE1/4NW1/4 of Section 24, a distance of 734.19 feet to the True Point of Beginning; 

Thence South 87° 17’ 41” East, along said north line of the NE1/4NW1/4 of Section 24, a distance of 570.66 feet to the 1/4 Corner common to
Section 13 and Section 24; 

	“	 South 01° 13’ 11” West, along the east line of said NE1/4NW1/4 of Section 24, a distance of
1310.06 feet to the Center North 1/16 Corner of Section 24; 



	“	 South 01° 13’ 11” West, along the east line of the SE1/4NW1/4 of Section 24, a distance of
242.80 feet; 



	“	 North 68° 21’ 43” West, a distance of 11.42 feet; 



	“	 North 47° 16’ 51” West, a distance of 41.44 feet; 



	“	 North 57° 49’ 39” West, a distance of 65.39 feet; 



	“	 North 15° 19’ 49” West, a distance of 48.15 feet; 



	“	 North 54° 25’ 42” East, a distance of 40.80 feet; 



	“	 North 48° 45’ 06” East, a distance of 31.32 feet; 



	“	 North 33° 13’ 37” West, a distance of 33.51 feet; 



	“	 South 82° 28’ 11” West, a distance of 39.65 feet; 



	“	 South 64° 48’ 06” West, a distance of 17.63 feet; 



	“	 North 08° 55’ 36” West, a distance of 72.21 feet; 



	“	 North 07° 19’ 19” East, a distance of 27.94 feet; 



	“	 South 86° 37’ 59” East, a distance of 59.61 feet; 



  
 SCHEDULE C-3 














	“	 North 05° 18’ 37” East, a distance of 39.54 feet; 



	“	 North 84° 56’ 57” West, a distance of 56.20 feet; 



	“	 North 09° 11’ 32” East, a distance of 135.54 feet; 



	“	 North 17° 48’ 42” East, a distance of 98.16 feet; 



	“	 North 07° 18’ 18” East, a distance of 86.50 feet; 



	“	 North 06° 01’ 30” West, a distance of 84.30 feet; 



	“	 North 02° 44’ 36” East, a distance of 41.51 feet; 



	“	 North 15° 49’ 23” West, a distance of 21.16 feet; 



	“	 North 71° 02’ 56” East, a distance of 40.08 feet; 



	“	 North 18° 57’ 04” West, a distance of 23.88 feet; 



	“	 South 71° 02’ 56” West, a distance of 40.21 feet; 



	“	 North 12° 42’ 34” West, a distance of 40.15 feet; 



	“	 North 18° 41’ 31” West, a distance of 98.90 feet; 



	“	 North 21° 21’ 10” West, a distance of 96.23 feet; 



	“	 North 23° 02’ 43” West, a distance of 47.71 feet; 



	Thence	 North 71° 02’ 39” East, a distance of 30.85 feet; 



	“	 North 18° 57’ 21” West, a distance of 32.00 feet; 



	“	 South 71° 02’ 39” West, a distance of 33.14 feet; 



	“	 North 23° 02’ 43” West, a distance of 19.35 feet; 



	“	 North 37° 06’ 27” West, a distance of 53.53 feet; 



	“	 North 27° 49’ 32” West, a distance of 63.53 feet; 



	“	 North 04° 00’ 22” West, a distance of 38.03 feet; 



	“	 North 82° 35’ 46” East, a distance of 10.06 feet; 



	“	 South 75° 22’ 03” East, a distance of 36.00 feet; 



	“	 North 14° 37’ 57” East, a distance of 32.00 feet; 



	“	 North 75° 22’ 03” West, a distance of 36.00 feet; 



	“	 South 82° 35’ 46” West, a distance of 20.30 feet; 



	“	 North 28° 27’ 13” West, a distance of 45.58 feet; 



	“	 North 21° 10’ 19” West, a distance of 50.34 feet; 



	“	 North 34° 24’ 32” West, a distance of 21.95 feet; 



	“	 North 59° 18’ 14” West, a distance of 51.93 feet; 



	“	 North 37° 11’ 33” West, a distance of 59.27 feet; 



	“	 North 03° 12’ 01” West, a distance of 20.56 feet; 



	“	 North 59° 42’ 37” West, a distance of 69.42 feet; 



	“	 North 47° 47’ 10” West, a distance of 104.92 feet to the True Point of Beginning.



 TRACT Ill (C): 
 A tract of land located
in Section 24, Township 38 North, Range 9 West, N.M.P.M., La Plata County, Colorado, being more particularly described as follows: 
 BEGINNING at the
Northwest Corner of Section 24, thence South 87° 17’ 25” East, a distance of 1310.92 feet to the West 1/16 Corner common to Section 13 and Section 24, thence South 01° 25’ 45” West, along the west line of
the NE1/4NW1/4 of Section 24, a distance of 65.46 feet to the True Point of Beginning; 
 Thence North 76° 33’ 57” East, a distance of
151.67 feet; 

	“	 along the arc of a tangent curve to the right with a delta angle of 27° 40’ 57” and a radius of
210.00 feet, a distance of 101.46 feet, the long chord bears South 89° 35’ 34” East, a distance of 100.48 feet; 



	“	 South 75° 45’ 06” East, a distance of 87.53 feet; 



	“	 South 82° 01’ 09” East, a distance of 222.64 feet; 



	“	 along the arc of a tangent curve to the right with a delta angle of 40° 13’ 56” and a radius of
410.00 feet, a distance of 287.90 feet, the long chord bears South 61° 54’ 11” East, a distance of 282.02 feet; 



  
 SCHEDULE C-4 














	“	 South 41° 47’ 13” East, a distance of 26.06 feet; 



	“	 along the arc of a tangent curve to the right with a delta angle of 11° 37’ 21” and a radius of
630.00 feet, a distance of 127.80 feet, the long chord bears South 35° 58’ 32” East, a distance of 127.58 feet; 



	“	 South 02° 06’ 03” West, a distance of 21.05 feet; 



	“	 South 27° 53’ 57” East, a distance of 42.19 feet; 



	“	 South 57° 53’ 57” East, a distance of 22.53 feet; 



	“	 along the arc of a non-tangent curve to the right with a delta angle of
16° 48’ 56” and a radius of 1020.00 feet, a distance of 299.35 feet, the long chord bears South 19° 46’ 06” East, a distance of 298.28 feet; 



Thence South 08° 49’ 13” East, a distance of 90.41 feet; 

	“	 South 00°19’ 18” West, a distance of 198.98 feet; 



	“	 South 04°49’ 32” West, a distance of 185.92 feet; 



	“	 along the arc of a tangent curve to the left with a delta angle of 21°38’ 40” and a radius of
1320.00 feet, a distance of 498.65 feet, the long chord bears South 5°59’ 48” East, a distance of 495.69 feet; 



	“	 South 16°49’ 08” East, a distance of 187.05 feet; 



	“	 South 16°12’ 48” East, a distance of 253.37 feet; 



	“	 along the arc of a tangent curve to the left with a delta angle of 11° 52’ 08” and a radius of
670.00 feet, a distance of 138.79 feet, the long chord bears South 22°08’ 51” East, a distance of 138.54 feet to the east line of the SE1/4NW1/4 of Section 24; 



	“	 South 01° 13’ 11” West, along said east line, a distance of 449.56 feet to the Center 1⁄4 Corner of Section 24; 



	“	 North 87° 23’ 14” West, along the south line of the SE1/4NW1/4 of Section 24, a distance of
524.39 feet; 



	“	 North 48° 05’ 04” West, a distance of 112.24 feet; 



	“	 North 08° 00’ 04” West, a distance of 28.45 feet; 



	“	 North 81°59’ 56” East, a distance of 159.90 feet; 



	“	 North 57°19’ 29” East, a distance of 117.08 feet; 



	“	 North 39°46’ 18” East, a distance of 130.28 feet; 



	“	 North 19°17’ 00” East, a distance of 142.29 feet; 



	“	 North 38°59’ 37” East, a distance of 131.16 feet; 



	“	 North 72°48’ 15” East, a distance of 43.05 feet; 



	“	 North 16° 12’ 48” West, a distance of 252.44 feet; 



	“	 North 16° 49’ 08” West, a distance of 186.73 feet; 



	“	 along the arc of a tangent curve to the right with a delta angle of 21°38’ 40” and a radius of
1380.00 feet, a distance of 521.32 feet, the long chord bears North 05°59’ 48” West, a distance of 518.23 feet; 



	“	 North 04°49’ 32” East, a distance of 183.56 feet; 



	“	 North 00°19’ 16” East, a distance of 193.10 feet; 



	“	 North 08°57’ 31” West, a distance of 82.93 feet; 



	“	 along the arc of a tangent curve to the left with a delta angle of 15° 48’ 17” and a radius of
960.00 feet, a distance of 264.81 feet, the long chord bears North 19°20’ 12” West, a distance of 263.97 feet; 



	“	 North 57° 53’ 57” West, a distance of 22.42 feet; 



	“	 North 27°53’ 57” West, a distance of 74.35 feet; 



	“	 North 02°06’ 03” East, a distance of 19.30 feet; 



	“	 along the arc of a non-tangent curve to the left with a delta angle of
09°55’ 05” and a radius of 570.00 feet, a distance of 98.67 feet, the long chord bears North 36° 49’ 40” West, a distance of 98.55 feet; 



	“	 North 41°47’ 13” West, a distance of 26.06 feet; 



  
 SCHEDULE C-5 














	“	 along the arc of a tangent curve to the left with a delta angle of 40°13’ 56” and a radius of
350.00 feet, a distance of 245.77 feet, the long chord bears North 61°54’ 11” West, a distance of 240.75 feet; 



	“	 North 82° 01’ 09” West, a distance of 225.93 feet; 



	“	 North 75°45’ 06” West, a distance of 90.81 feet; 



	“	 along the arc of a tangent curve to the left with a delta angle of 27°40’ 57” and a radius of
150.00 feet, a distance of 72.47 feet, the long chord bears North 89°35’ 34” West, a distance of 71.77 feet; 



	“	 South 76°33’ 57” West, a distance of 167.60 feet to the west line of the NE1/4NW1/4 of
Section 24; 



	“	 North 01°25’ 45” East, along said west line, a distance of 62.08 feet to the True Point of
Beginning. 


 La Plata County, Colorado 
  

	5.	 Husky 



LOT 8-B, HIGHLAND INDUSTRIAL PARK THIRD SUBDIVISION FINAL PLAT, BEING A REPLAT OF A PORTION OF HIGHLAND INDUSTRIAL PARK
SECOND SUBDIVISION FINAL PLAT AND BEING A PART OF THE SW 1/4 OF SECTION 2 TOWNSHIP7 NORTH RANGE 68 WEST OF THE SIXTH PRINCIPAL MERIDIAN, TOWN OF AULT, COUNTY OF WELD, STATE OF COLORADO. 

Weld County, Colorado 

  
 SCHEDULE C-6 













 SCHEDULE D 

This Schedule D covers all right, title and interest, if any, of Public Service Company of Colorado in goods, fixtures or improvements located on the lands
described below in this Schedule D, but does not include and is not intended to encumber any fee or leasehold interest in the described lands themselves. 

None. 

  
 SCHEDULE D-1