Exhibit 4.2

TARGA RESOURCES CORP.,

as Issuer,

EACH OF THE SUBSIDIARY GUARANTORS PARTY HERETO,

as Subsidiary Guarantors,

and

U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION,

as Trustee

THIRD SUPPLEMENTAL INDENTURE

Dated as of July 7, 2022

to

Indenture dated as of April 6, 2022

5.200% Senior Notes due 2027

6.250% Senior Notes due 2052

Table of Contents

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THIS THIRD SUPPLEMENTAL INDENTURE, dated as of July 7, 2022 (the “Third Supplemental Indenture”), is among Targa Resources Corp., a Delaware corporation (the “Issuer”), the parties identified as “Subsidiary Guarantors” on the signature pages hereto (collectively, the “Subsidiary Guarantors”), and U.S. Bank Trust Company, National Association, a national banking association, as trustee (the “Trustee”).

WHEREAS, the Issuers, the Subsidiary Guarantors named therein and the Trustee have heretofore executed and delivered an Indenture, dated as of April 6, 2022 (the “Base Indenture” and, as supplemented by this Third Supplemental Indenture, the “Indenture”), providing for the issuance by the Issuer from time to time of its debentures, notes, bonds or other evidences of indebtedness to be issued in one or more series unlimited as to principal amount (the “Debt Securities”), and the guarantee of the Debt Securities (the “Guarantee”) by one or more of the Subsidiary Guarantors;

WHEREAS, the Issuer has duly authorized and desires to cause to be established pursuant to the Base Indenture and this Third Supplemental Indenture two new series of Debt Securities designated as follows: the “5.200% Senior Notes due 2027” (the “2027 Notes”) and the “6.250% Senior Notes due 2052” (the “2052 Notes” and, together with the 2027 Notes, the “Notes”);

WHEREAS, Sections 2.01 and 2.03 of the Base Indenture permit the execution of indentures supplemental thereto to establish the form and terms of Debt Securities of any series;

WHEREAS, pursuant to Section 9.01(h) of the Base Indenture, the Issuer has requested that the Trustee join in the execution of this Third Supplemental Indenture to establish the form and terms of the Notes; and

WHEREAS, all things necessary have been done to make the Notes, when executed and delivered by the Issuer and authenticated and delivered by the Trustee hereunder and under the Base Indenture and duly issued by the Issuer, and the Guarantees of the Subsidiary Guarantors, when the Notes are duly issued by the Issuer, the valid obligations of the Issuer and the Subsidiary Guarantors, respectively, and to make this Third Supplemental Indenture a valid agreement of the Issuer and the Subsidiary Guarantors enforceable in accordance with its terms.

NOW, THEREFORE, the Issuer, the Subsidiary Guarantors and the Trustee hereby agree that the following provisions shall supplement the Base Indenture:

ARTICLE I

DEFINITIONS

Section 1.1 Generally.

(a) Capitalized terms used herein and not otherwise defined herein shall have the respective meanings ascribed thereto in the Base Indenture.

(b) The rules of interpretation set forth in the Base Indenture shall be applied hereto as if set forth in full herein.

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Section 1.2 Definition of Certain Terms.

For all purposes of this Third Supplemental Indenture, except as otherwise expressly provided or unless the context otherwise requires, the following terms shall have the following respective meanings:

“2027 Interest Payment Dates” shall have the meaning assigned to such term in Section 2.2(a).

“2052 Interest Payment Dates” shall have the meaning assigned to such term in Section 2.2(b).

“2027 Notes Par Call Date” means June 1, 2027.

“2052 Notes Par Call Date” means January 1, 2052.

“Book-Entry Notes” shall have the meaning assigned to such term in Section 2.1.

“Original 2027 Notes” shall have the meaning assigned to such term in Section 2.2(a).

“Original 2052 Notes” shall have the meaning assigned to such term in Section 2.2(b).

“Par Call Date” means, with respect to the 2027 Notes and the 2052 Notes, the 2027 Notes Par Call Date and the 2052 Notes Par Call Date, respectively.

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

The Treasury Rate shall be determined by the Issuer after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third Business Day preceding the Redemption Date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily)—H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities–Treasury constant maturities–Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Issuer shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the Redemption Date to the applicable Par Call Date with respect to the Notes to be redeemed (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields – one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life – and shall interpolate to the applicable Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the Redemption Date.

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If on the third Business Day preceding the Redemption Date H.15 TCM or any successor designation or publication is no longer published, the Issuer shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second Business Day preceding such Redemption Date of the United States Treasury security maturing on, or with a maturity that is closest to, the relevant Par Call Date, as applicable. If there is no United States Treasury security maturing on the applicable Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the applicable Par Call Date, one with a maturity date preceding the applicable Par Call Date and one with a maturity date following the applicable Par Call Date, the Issuer shall select the United States Treasury security with a maturity date preceding the applicable Par Call Date. If there are two or more United States Treasury securities maturing on the applicable Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Issuer shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

ARTICLE II

GENERAL TERMS OF THE NOTES

Section 2.1 Form.

The 2027 Notes and the 2052 Notes and the Trustee’s certificates of authentication shall be substantially in the form of Exhibit A-1 and Exhibit A-2, respectively, to this Third Supplemental Indenture, which are hereby incorporated into this Third Supplemental Indenture. The terms and provisions contained in the Notes shall constitute, and are hereby expressly made, a part of this Third Supplemental Indenture and, to the extent applicable, the Issuer, the Subsidiary Guarantors and the Trustee, by their execution and delivery of this Third Supplemental Indenture, expressly agree to such terms and provisions and to be bound thereby.

Each series of Notes shall be issued upon original issuance in whole in the form of one or more Global Debt Securities as contemplated in the Base Indenture (the “Book-Entry Notes”). Each Book-Entry Note shall represent such of the outstanding Notes as shall be specified therein and shall provide that it shall represent the aggregate principal amount of outstanding Notes from time to time endorsed thereon and that the aggregate principal amount of outstanding Notes represented thereby may from time to time be reduced or increased, as appropriate, to reflect exchanges and redemptions.

The Issuer initially appoints The Depository Trust Company to act as Depositary with respect to the Book-Entry Notes.

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Section 2.2 Title, Amount and Payment of Principal and Interest.

(a) The title of the 2027 Notes shall be designated as the “5.200% Senior Notes due 2027”. The Trustee shall authenticate and deliver (i) the 2027 Notes for original issue on the date hereof (the “Original 2027 Notes”) in the aggregate principal amount of $750,000,000, and (ii) additional 2027 Notes for original issue from time to time after the date hereof in such principal amounts as may be specified in an Issuer Order described in this sentence, in each case upon an Issuer Order for the authentication and delivery thereof and satisfaction of the other provisions of Section 2.04 of the Base Indenture. Such Issuer Order shall specify the amount of the 2027 Notes to be authenticated, the date on which the original issue of 2027 Notes is to be authenticated, and the name or names of the initial Holder or Holders. The Original 2027 Notes and any additional 2027 Notes issued and authenticated pursuant to clause (ii) of this Section 2.2(a) shall constitute a single series of Debt Securities for all purposes under the Indenture.

The principal amount of each 2027 Note shall be payable on July 1, 2027. Each 2027 Note shall bear interest from the date of original issuance, or the most recent date to which interest has been paid, at the fixed rate of 5.200% per annum. The dates on which interest on the 2027 Notes shall be payable shall be January 1 and July 1 of each year (the “2027 Interest Payment Dates”), commencing January 1, 2023. The regular record date for interest payable on the 2027 Notes on any 2027 Interest Payment Date shall be December 15 or June 15, as the case may be, next preceding such 2027 Interest Payment Date.

Payments of principal of, premium, if any, on, and interest due on the 2027 Notes representing Book-Entry Notes on any 2027 Interest Payment Date or at maturity will be made available to the Paying Agent by 11:00 a.m., New York City time, on such date, unless such date falls on a day that is not a Business Day, in which case (x) such payments will be made available to the Paying Agent by 11:00 a.m., New York City time, on the next Business Day, and (y) for so long as clause (x) is satisfied, no interest shall accrue on the amount of interest due on such 2027 Interest Payment Date for the period from and after such 2027 Interest Payment Date and the date of payment. As soon as possible thereafter, the Paying Agent will make such payments to the Depositary.

(b) The title of the 2052 Notes shall be designated as the “6.250% Senior Notes due 2052”. The Trustee shall authenticate and deliver (i) the 2052 Notes for original issue on the date hereof (the “Original 2052 Notes”) in the aggregate principal amount of $500,000,000, and (ii) additional 2052 Notes for original issue from time to time after the date hereof in such principal amounts as may be specified in an Issuer Order described in this sentence, in each case upon an Issuer Order for the authentication and delivery thereof and satisfaction of the other provisions of Section 2.04 of the Base Indenture. Such Issuer Order shall specify the amount of the 2052 Notes to be authenticated, the date on which the original issue of 2052 Notes is to be authenticated, and the name or names of the initial Holder or Holders. The Original 2052 Notes and any additional 2052 Notes issued and authenticated pursuant to clause (ii) of this Section 2.2(b) shall constitute a single series of Debt Securities for all purposes under the Indenture.

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The principal amount of each 2052 Note shall be payable on July 1, 2052. Each 2052 Note shall bear interest from the date of original issuance, or the most recent date to which interest has been paid, at the fixed rate of 6.250% per annum. The dates on which interest on the 2052 Notes shall be payable shall be January 1 and July 1 of each year (the “2052 Interest Payment Dates”), commencing January 1, 2023. The regular record date for interest payable on the 2052 Notes on any 2052 Interest Payment Date shall be December 15 or June 15, as the case may be, next preceding such 2052 Interest Payment Date.

Payments of principal of, premium, if any, on, and interest due on the 2052 Notes representing Book-Entry Notes on any 2052 Interest Payment Date or at maturity will be made available to the Paying Agent by 11:00 a.m., New York City time, on such date, unless such date falls on a day that is not a Business Day, in which case (x) such payments will be made available to the Paying Agent by 11:00 a.m., New York City time, on the next Business Day, and (y) for so long as clause (x) is satisfied, no interest shall accrue on the amount of interest due on such 2052 Interest Payment Date for the period from and after such 2052 Interest Payment Date and the date of payment. As soon as possible thereafter, the Paying Agent will make such payments to the Depositary.

Section 2.3 Transfer and Exchange.

The transfer and exchange of Book-Entry Notes or beneficial interests therein shall be effected through the Depositary, as Global Debt Securities in accordance with Section 2.17 of the Base Indenture and this Article II of the Third Supplemental Indenture and the rules and procedures of the Depositary therefor.

ARTICLE III

GUARANTY; FUTURE SUBSIDIARY GUARANTEES

Section 3.1 Guarantee.

In accordance with Article X of the Base Indenture, the Notes will be fully, unconditionally and absolutely guaranteed on an unsecured, unsubordinated basis by the Subsidiary Guarantors. Such Guarantees shall be evidenced by the execution by each Subsidiary Guarantee of the Indenture or a supplement thereto, and no notation of such Guarantees on the Notes shall be required to evidence them. The Guarantees are subject to all of the provisions of Article X of the Base Indenture, including the release provisions therein.

Section 3.2 Future Subsidiary Guarantors.

If any Subsidiary of the Issuer that is not then a Subsidiary Guarantor guarantees any obligations of the Issuer under the Credit Agreement, then the Issuer shall cause such Subsidiary to execute and deliver to the Trustee a supplemental indenture within sixty (60) days after it guarantees such indebtedness under the Credit Agreement, pursuant to which such Subsidiary will Guarantee the Issuer’s obligations with respect to the Notes and under the Indenture.

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ARTICLE IV

REDEMPTION

Section 4.1 Optional Redemption of 2027 Notes.

(a) Prior to the 2027 Notes Par Call Date, the Issuer may redeem the 2027 Notes at its option, in whole or in part, at any time and from time to time, at a redemption price equal to the greater of:

(1) (A) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the Redemption Date (assuming the 2027 Notes matured on the 2027 Notes Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 30 basis points less (B) interest accrued to the Redemption Date; and

(2) 100% of the principal amount of the 2027 Notes to be redeemed,

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

(b) On or after the 2027 Notes Par Call Date, the Issuer may redeem the 2027 Notes, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the 2027 Notes being redeemed plus accrued and unpaid interest thereon to the Redemption Date.

(c) Each of the above redemption prices is subject to the right of Holders on the relevant record date to receive interest due on the relevant interest payment date.

Section 4.2 Optional Redemption of 2052 Notes.

(a) Prior to the 2052 Notes Par Call Date, the Issuer may redeem the 2052 Notes at its option, in whole or in part, at any time and from time to time, at a redemption price equal to the greater of:

(1) (A) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the Redemption Date (assuming the 2052 Notes matured on the 2052 Notes Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 45 basis points less (B) interest accrued to the Redemption Date; and

(2) 100% of the principal amount of the Notes to be redeemed,

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

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(b) On or after the 2052 Notes Par Call Date, the Issuer may redeem the 2052 Notes, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the 2052 Notes being redeemed plus accrued and unpaid interest thereon to the Redemption Date.

(c) Each of the above redemption prices is subject to the right of Holders on the relevant record date to receive interest due on the relevant interest payment date.

Section 4.3 Optional Redemption Generally.

(a) Except as provided above, any redemption of the Notes shall be made pursuant to the provisions of Article III of the Base Indenture. The actual redemption price, calculated as provided in Section 4.1 or Section 4.2 above, as applicable, and paragraph 5 of the form of Note attached as Exhibit A-1 or Exhibit A-2 hereto, as applicable, shall be certified in writing to the Trustee by the Issuer no later than the Redemption Date.

(b) The Issuer’s actions and determinations in determining the redemption price with respect to any redemption shall be conclusive and binding for all purposes, absent manifest error. The Trustee shall have no responsibility for calculating the redemption price.

Section 4.4 No Mandatory Redemption.

The Issuer shall not be required to make mandatory redemption or sinking fund payments with respect to the Notes and shall have no obligation to repurchase any Notes at the option of the Holders.

ARTICLE V

MISCELLANEOUS PROVISIONS

Section 5.1 Ratification of Base Indenture.

The Base Indenture, as supplemented by this Third Supplemental Indenture, is in all respects ratified and confirmed, and this Third Supplemental Indenture shall be deemed part of the Base Indenture in the manner and to the extent herein and therein provided.

Section 5.2 Trustee Not Responsible for Recitals.

The recitals contained herein and in the Notes, except with respect to the Trustee’s certificates of authentication, shall be taken as the statements of the Issuer and the Subsidiary Guarantors, and the Trustee assumes no responsibility for the correctness of the same. The Trustee makes no representations as to the validity or sufficiency of this Third Supplemental Indenture or of the Notes.

Section 5.3 Table of Contents, Headings, etc.

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The table of contents and headings of the Articles and Sections of this Third Supplemental Indenture have been inserted for convenience of reference only, are not to be considered a part hereof and shall in no way modify or restrict any of the terms or provisions hereof.

Section 5.4 Counterpart Originals.

The parties may sign any number of copies of this Third Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement.

Section 5.5 Governing Law.

THIS THIRD SUPPLEMENTAL INDENTURE AND THE NOTES SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

(Signature Pages Follow)

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IN WITNESS WHEREOF, the parties hereto have caused this Third Supplemental Indenture to be duly executed as of the day and year first above written.

Signature Page of Third Supplemental Indenture

Signature Page of Third Supplemental Indenture

Signature Page of Third Supplemental Indenture

Signature Page of Third Supplemental Indenture

Signature Page of Third Supplemental Indenture

Signature Page of Third Supplemental Indenture

Signature Page of Third Supplemental Indenture

Exhibit A-1

FORM OF NOTE

[FACE OF SECURITY]

[UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY (“DTC”) (55 WATER STREET, NEW YORK, NEW YORK 10041) TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS MAY BE REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR SUCH OTHER ENTITY AS MAY BE 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.]^*

[TRANSFERS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT NOT IN PART, TO NOMINEES OF DTC OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR’S NOMINEE AND TRANSFERS OF PORTIONS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN THE INDENTURE REFERRED TO HEREIN.]*

TARGA RESOURCES CORP.

5.200% SENIOR NOTES DUE 2027

TARGA RESOURCES CORP., a Delaware corporation (the “Issuer,” which term includes any successor under the Indenture hereinafter referred to), for value received, hereby promises to pay to ____________ or its registered assigns, the principal sum of __________U.S. dollars ($________), [or such greater or lesser principal sum as is shown on the attached Schedule of Increases and Decreases in Global Security]^*, on July 1, 2027 in such coin and 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, and to pay interest thereon at an annual rate of 5.200% payable on January 1 and July 1 of each year, to the person in whose name this Security is registered at the close of business on the record date for such interest, which shall be the preceding December 15 or June 15 (each, a “Regular Record Date”), respectively, payable commencing on January 1, 2023.

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Reference is made to the further provisions of this Security set forth on the reverse hereof. Such further provisions shall for all purposes have the same effect as though fully set forth at this place.

The statements in the legends set forth in this Security are an integral part of the terms of this Security and by acceptance hereof the Holder of this Security agrees to be subject to, and bound by, the terms and provisions set forth in each such legend.

This Security is issued in respect of a series of Debt Securities of an initial aggregate principal amount of $750,000,000 designated as the 5.200% Senior Notes due 2027 of the Issuer and is governed by the Indenture dated as of April 6, 2022 (the “Base Indenture”), duly executed and delivered by the Issuer, as Issuer, the Subsidiary Guarantors party thereto (collectively, the “Subsidiary Guarantors”), and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”), as supplemented by the Third Supplemental Indenture dated as of July 7, 2022 (the “Third Supplemental Indenture”, and together with the Base Indenture, the “Indenture”), duly executed by the Issuer, the Subsidiary Guarantors and the Trustee. The terms of the Indenture are incorporated herein by reference. This Security shall in all respects be entitled to the same benefits as definitive Debt Securities under the Indenture.

If and to the extent any provision of the Indenture limits, qualifies or conflicts with any other provision of the Indenture that is required to be included in the Indenture or is deemed applicable to the Indenture by virtue of the provisions of the Trust Indenture Act of 1939, as amended (the “TIA”), such required provision shall control.

This Security shall not be valid or become obligatory for any purpose until the Trustee’s Certificate of Authentication hereon shall have been manually signed by the Trustee under the Indenture.

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

Dated:

TRUSTEE’S CERTIFICATE OF AUTHENTICATION:

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

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[REVERSE OF SECURITY]

TARGA RESOURCES CORP.

5.200% SENIOR NOTES DUE 2027

This Security is one of a duly authorized issue of debentures, notes or other evidences of indebtedness of the Issuer (the “Debt Securities”) of the series hereinafter specified, all issued or to be issued under and pursuant to the Indenture, to which Indenture reference is hereby made for a description of the rights, limitations of rights, obligations, duties and immunities thereunder of the Trustee, the Issuer, the Subsidiary Guarantors and the Holders of the Debt Securities. The Debt Securities may be issued in one or more series, which different series may be issued in various aggregate principal amounts, may mature at different times, may bear interest (if any) at different rates, may be subject to different sinking, purchase or analogous funds (if any) and may otherwise vary as provided in the Indenture. This Security is one of a series designated as the 5.200% Senior Notes due 2027 of the Issuer, in an initial aggregate principal amount of $750,000,000 (the “Securities” and each a “Security”).

1. Interest.

The Issuer promises to pay interest on the principal amount of this Security at the rate of 5.200% per annum.

The Issuer will pay interest semi-annually on January 1 and July 1 of each year (each such date, an “Interest Payment Date”), commencing January 1, 2023. Interest on the Securities will accrue from the most recent date to which interest has been paid, or, if no interest has been paid on the Securities, from July 7, 2022. Interest will be computed on the basis of a 360-day year consisting of twelve 30-day months. The Issuer shall pay interest (including post-petition interest in any proceeding under any applicable bankruptcy laws) on overdue installments of interest (without regard to any applicable grace period) and on overdue principal and premium, if any, from time to time on demand at the same rate per annum, in each case to the extent lawful.

2. Method of Payment.

Except as provided in the Indenture, the Issuer shall pay interest on the Securities to the persons who are the registered Holders at the close of business on the Regular Record Date immediately preceding the Interest Payment Date. The Issuer shall pay principal, premium, if any, and interest in such coin or currency of the United States of America as at the time of payment shall be legal tender for payment of public and private debts. Payments in respect of a Global Security (including principal, premium, if any, and interest) will be made by wire transfer of immediately available funds to the accounts specified by the Depositary. Payments in respect of Securities in definitive form (including principal, premium, if any, and interest) will be made at the office or agency of the Issuer maintained for such purpose at the Corporate Trust Office of the Trustee, or, at the option of the Issuer, payment of interest may be made by check mailed to the Holders on the relevant record date at their addresses set forth in the register of Holders maintained by the Registrar or at the option of the Holder, payment of interest on Securities in definitive form will be made by wire transfer of immediately available funds to any account maintained in the United States, provided such Holder has requested such method of payment and provided timely wire transfer instructions to the Paying Agent. The Holder must surrender this Security to a Paying Agent to collect payment of principal.

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3. Paying Agent and Registrar.

Initially, U.S. Bank Trust Company, National Association will act as Paying Agent and Registrar. The Issuer may change any Paying Agent or Registrar at any time upon notice to the Trustee and the Holders. The Issuer may act as Paying Agent.

4. Indenture.

This Security is one of a duly authorized issue of Debt Securities of the Issuer issued and to be issued in one or more series under the Indenture.

Capitalized terms herein are used as defined in the Indenture unless otherwise defined herein. The terms of the Securities include those stated in the Base Indenture, those made part of the Indenture by reference to the TIA, as in effect on the date of the Base Indenture, and those terms stated in the Third Supplemental Indenture. The Securities are subject to all such terms, and Holders of Securities are referred to the Base Indenture, the Third Supplemental Indenture and the TIA for a statement of them. The Securities of this series are general unsecured obligations of the Issuer initially issued in an aggregate principal amount of $750,000,000; provided, however, that the authorized aggregate principal amount of such series may be increased from time to time as provided in the Third Supplemental Indenture.

5. Optional Redemption.

(a) Prior to the 2027 Notes Par Call Date, the Issuer may redeem the Securities at its option, in whole or in part, at any time and from time to time, at a redemption price equal to the greater of:

(1) (A) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the Redemption Date (assuming the Securities matured on the 2027 Notes Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 30 basis points less (B) interest accrued to the Redemption Date; and

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

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

(b) On or after the 2027 Notes Par Call Date, the Issuer may redeem the Securities, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Securities being redeemed plus accrued and unpaid interest thereon to the Redemption Date.

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(c) The redemption prices set forth above are subject to the right of Holders on the relevant record date to receive interest due on the relevant interest payment date.

6. Mandatory Redemption.

The Issuer shall not be required to make mandatory redemption or sinking fund payments with respect to the Securities or to repurchase them at the option of the Holders.

7. Denominations; Transfer; Exchange.

The Securities are to be issued in registered form, without coupons, in denominations of $2,000 and integral multiples of $1,000 in excess thereof. A Holder may register the transfer of, or exchange, Securities in accordance with the Indenture. The Registrar may require a Holder, among other things, to furnish appropriate endorsements and transfer documents and to pay any taxes and fees required by law or permitted by the Indenture.

8. Person Deemed Owners.

The registered Holder of a Security may be treated as the owner of it for all purposes.

9. Amendment; Supplement; Waiver.

Subject to certain exceptions, the Indenture may be amended or supplemented, and any existing Event of Default or compliance with any provision may be waived, with the consent of the Holders of a majority in principal amount of the then outstanding notes of the affected series. Without consent of any Holder of a Security, the parties thereto may amend or supplement the Indenture to, among other things, cure any ambiguity or omission, to correct any defect or inconsistency, or to make any other change that does not adversely affect the rights of any Holder of a Security. Any such consent or waiver by the Holder of this Security (unless revoked as provided in the Indenture) shall be conclusive and binding upon such Holder and upon all future Holders and owners of this Security and any Securities which may be issued in exchange or substitution herefor, regardless of whether any notation thereof is made upon this Security or such other Securities.

10. Defaults and Remedies.

Certain events of bankruptcy or insolvency with respect to the Issuer are Events of Default that will result in the principal amount of the Securities, together with any accrued and unpaid interest thereon, becoming due and payable immediately upon the occurrence of such Events of Default. If any other Event of Default with respect to the Securities occurs and is continuing, then in every such case the Trustee or the Holders of not less than 25% in aggregate principal amount of the Securities then outstanding may declare the principal amount of all the Securities, together with any accrued and unpaid interest thereon, to be due and payable immediately in the manner and with the effect provided in the Indenture. Notwithstanding the preceding sentence, however, if at any time after such a declaration of acceleration has been made, the Holders of a majority in principal amount of the outstanding Securities, by written notice to the Trustee, may rescind such declaration and annul its consequences if the rescission would not conflict with any judgment or decree of a court of competent jurisdiction and if all

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existing Events of Default with respect to the Securities, other than the nonpayment of the principal, premium, if any, or interest which has become due solely by such declaration acceleration, shall have been cured or shall have been waived. No such rescission shall affect any subsequent default or shall impair any right consequent thereon. Holders of Securities may not enforce the Indenture or the Securities except as provided in the Indenture. The Trustee may require indemnity or security satisfactory to it before it enforces the Indenture or the Securities. Subject to certain limitations, Holders of a majority in aggregate principal amount of the Securities then outstanding may direct the Trustee in its exercise of any trust or power.

11. Trustee Dealings with Issuer.

The Trustee under the Indenture, in its individual or any other capacity, may make loans to, accept deposits from, and perform services for the Issuer or its Affiliates, and may otherwise deal with the Issuer or its Affiliates as if it were not the Trustee.

12. Authentication.

This Security shall not be valid until the Trustee signs the certificate of authentication on the other side of this Security.

13. Abbreviations and Defined Terms.

Customary abbreviations may be used in the name of a Holder of a Security or an assignee, such as: TEN COM (tenant in common), TEN ENT (tenants by the entireties), JT TEN (joint tenants with right of survivorship and not as tenants in common), CUST (Custodian), and U/G/M/A (Uniform Gifts to Minors Act).

14. CUSIP Numbers.

Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Issuer has caused CUSIP numbers to be printed on the Securities as a convenience to the Holders of the Securities. No representation is made as to the accuracy of such number as printed on the Securities and reliance may be placed only on the other identification numbers printed hereon.

15. Absolute Obligation.

No reference herein to the Indenture and no provision of this Security or the Indenture shall alter or impair the obligation of the Issuer, which is absolute and unconditional, to pay the principal of, premium, if any, and interest on this Security in the manner, at the respective times, at the rate and in the coin or currency herein prescribed.

16. Governing Law.

This Security shall be construed in accordance with and governed by the laws of the State of New York.

A-1-7

17. Guarantee.

The Securities are fully and unconditionally guaranteed by the Subsidiary Guarantors as set forth in Article X of the Base Indenture.

The Issuer shall furnish to any Holder upon written request and without charge a copy of the Indenture. Requests may be made to:

Targa Resources Corp.

811 Louisiana St, Suite 2100

Houston, Texas 77002

Attn: Chief Financial Officer

A-1-8

ABBREVIATIONS

The following abbreviations, when used in the inscription on the face of this instrument, shall be construed as though they were written out in full according to applicable laws or regulations:

Additional abbreviations may also be used though not in the above list.

ASSIGNMENT

FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and transfer(s) unto

PLEASE INSERT SOCIAL SECURITY OR OTHER

IDENTIFYING NUMBER OF ASSIGNEE

PLEASE PRINT OR TYPE NAME AND ADDRESS INCLUDING POSTAL ZIP CODE OF ASSIGNEE:

the within Security and all rights thereunder, hereby irrevocably constituting and appointing to transfer said Security on the books of the Issuer, with full power of substitution in the premises.

Dated:                                                                    

Signature:                                                               

A-1-9

SCHEDULE OF INCREASES OR DECREASES

IN GLOBAL SECURITY^*

The following increases or decreases in this Global Security have been made:

A-1-10

Exhibit A-2

FORM OF NOTE

[FACE OF SECURITY]

[UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY (“DTC”) (55 WATER STREET, NEW YORK, NEW YORK 10041) TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS MAY BE REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR SUCH OTHER ENTITY AS MAY BE 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.]^*

[TRANSFERS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT NOT IN PART, TO NOMINEES OF DTC OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR’S NOMINEE AND TRANSFERS OF PORTIONS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN THE INDENTURE REFERRED TO HEREIN.]*

TARGA RESOURCES CORP.

6.250% SENIOR NOTES DUE 2052

TARGA RESOURCES CORP., a Delaware corporation (the “Issuer,” which term includes any successor under the Indenture hereinafter referred to), for value received, hereby promises to pay to _________________ or its registered assigns, the principal sum of _____________ U.S. dollars ($ ____________), [or such greater or lesser principal sum as is shown on the attached Schedule of Increases and Decreases in Global Security]^*, on July 1, 2052 in such coin and 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, and to pay interest thereon at an annual rate of 6.250% payable on January 1 and July 1 of each year, to the person in whose name this Security is registered at the close of business on the record date for such interest, which shall be the preceding December 15 and June 15 (each, a “Regular Record Date”), respectively, payable commencing on January 1, 2023.

A-2-1

Reference is made to the further provisions of this Security set forth on the reverse hereof. Such further provisions shall for all purposes have the same effect as though fully set forth at this place.

The statements in the legends set forth in this Security are an integral part of the terms of this Security and by acceptance hereof the Holder of this Security agrees to be subject to, and bound by, the terms and provisions set forth in each such legend.

This Security is issued in respect of a series of Debt Securities of an initial aggregate principal amount of $500,000,000 designated as the 6.250% Senior Notes due 2052 of the Issuer and is governed by the Indenture dated as of April 6, 2022 (the “Base Indenture”), duly executed and delivered by the Issuer, as Issuer, the Subsidiary Guarantors party thereto (collectively, the “Subsidiary Guarantors”), and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”), as supplemented by the Third Supplemental Indenture dated as of July 7, 2022 (the “Third Supplemental Indenture”, and together with the Base Indenture, the “Indenture”), duly executed by the Issuer, the Subsidiary Guarantors and the Trustee. The terms of the Indenture are incorporated herein by reference. This Security shall in all respects be entitled to the same benefits as definitive Debt Securities under the Indenture.

If and to the extent any provision of the Indenture limits, qualifies or conflicts with any other provision of the Indenture that is required to be included in the Indenture or is deemed applicable to the Indenture by virtue of the provisions of the Trust Indenture Act of 1939, as amended (the “TIA”), such required provision shall control.

This Security shall not be valid or become obligatory for any purpose until the Trustee’s Certificate of Authentication hereon shall have been manually signed by the Trustee under the Indenture.

A-2-2

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

Dated:

TRUSTEE’S CERTIFICATE OF AUTHENTICATION:

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

A-2-3

[REVERSE OF SECURITY]

TARGA RESOURCES CORP.

6.250% SENIOR NOTES DUE 2052

This Security is one of a duly authorized issue of debentures, notes or other evidences of indebtedness of the Issuer (the “Debt Securities”) of the series hereinafter specified, all issued or to be issued under and pursuant to the Indenture, to which Indenture reference is hereby made for a description of the rights, limitations of rights, obligations, duties and immunities thereunder of the Trustee, the Issuer, the Subsidiary Guarantors and the Holders of the Debt Securities. The Debt Securities may be issued in one or more series, which different series may be issued in various aggregate principal amounts, may mature at different times, may bear interest (if any) at different rates, may be subject to different sinking, purchase or analogous funds (if any) and may otherwise vary as provided in the Indenture. This Security is one of a series designated as the 6.250% Senior Notes due 2052 of the Issuer, in an initial aggregate principal amount of $500,000,000 (the “Securities”).

1. Interest.

The Issuer promises to pay interest on the principal amount of this Security at the rate of 6.250% per annum.

The Issuer will pay interest semi-annually on January 1 and July 1 of each year (each such date, an “Interest Payment Date”), commencing January 1, 2023. Interest on the Securities will accrue from the most recent date to which interest has been paid, or, if no interest has been paid on the Securities, from July 7, 2022. Interest will be computed on the basis of a 360-day year consisting of twelve 30-day months. The Issuer shall pay interest (including post-petition interest in any proceeding under any applicable bankruptcy laws) on overdue installments of interest (without regard to any applicable grace period) and on overdue principal and premium, if any, from time to time on demand at the same rate per annum, in each case to the extent lawful.

2. Method of Payment.

Except as provided in the Indenture, the Issuer shall pay interest on the Securities to the persons who are the registered Holders at the close of business on the Regular Record Date immediately preceding the Interest Payment Date. The Issuer shall pay principal, premium, if any, and interest in such coin or currency of the United States of America as at the time of payment shall be legal tender for payment of public and private debts. Payments in respect of a Global Security (including principal, premium, if any, and interest) will be made by wire transfer of immediately available funds to the accounts specified by the Depositary. Payments in respect of Securities in definitive form (including principal, premium, if any, and interest) will be made at the office or agency of the Issuer maintained for such purpose at the Corporate Trust Office of the Trustee, or, at the option of the Issuer, payment of interest may be made by check mailed to the Holders on the relevant record date at their addresses set forth in the register of Holders maintained by the Registrar or at the option of the Holder, payment of interest on Securities in definitive form will be made by wire transfer of immediately available funds to any account maintained in the United States, provided such Holder has requested such method of payment and provided timely wire transfer instructions to the Paying Agent. The Holder must surrender this Security to a Paying Agent to collect payment of principal.

A-2-4

3. Paying Agent and Registrar.

Initially, U.S. Bank Trust Company, National Association will act as Paying Agent and Registrar. The Issuer may change any Paying Agent or Registrar at any time upon notice to the Trustee and the Holders. The Issuer may act as Paying Agent.

4. Indenture.

This Security is one of a duly authorized issue of Debt Securities of the Issuer issued and to be issued in one or more series under the Indenture.

Capitalized terms herein are used as defined in the Indenture unless otherwise defined herein. The terms of the Securities include those stated in the Base Indenture, those made part of the Indenture by reference to the TIA, as in effect on the date of the Base Indenture, and those terms stated in the Third Supplemental Indenture. The Securities are subject to all such terms, and Holders of Securities are referred to the Base Indenture, the Third Supplemental Indenture and the TIA for a statement of them. The Securities of this series are general unsecured obligations of the Issuer initially issued in an aggregate principal amount of $500,000,000; provided, however, that the authorized aggregate principal amount of such series may be increased from time to time as provided in the Third Supplemental Indenture.

5. Optional Redemption.

(a) Prior to the 2052 Notes Par Call Date, the Issuer may redeem the Securities at its option, in whole or in part, at any time and from time to time, at a redemption price equal to the greater of:

(1) (A) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the Redemption Date (assuming the Securities matured on the 2052 Notes Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 45 basis points less (B) interest accrued to the Redemption Date; and

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

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

(b) On or after the 2052 Notes Par Call Date, the Issuer may redeem the Securities, in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Securities being redeemed plus accrued and unpaid interest thereon to the Redemption Date.

A-2-5

(c) The redemption prices set forth above are subject to the right of Holders on the relevant record date to receive interest due on the relevant interest payment date.

6. Mandatory Redemption.

The Issuer shall not be required to make mandatory redemption or sinking fund payments with respect to the Securities or to repurchase them at the option of the Holders.

7. Denominations; Transfer; Exchange.

The Securities are to be issued in registered form, without coupons, in denominations of $2,000 and integral multiples of $1,000 in excess thereof. A Holder may register the transfer of, or exchange, Securities in accordance with the Indenture. The Registrar may require a Holder, among other things, to furnish appropriate endorsements and transfer documents and to pay any taxes and fees required by law or permitted by the Indenture.

8. Person Deemed Owners.

The registered Holder of a Security may be treated as the owner of it for all purposes.

9. Amendment; Supplement; Waiver.

Subject to certain exceptions, the Indenture may be amended or supplemented, and any existing Event of Default or compliance with any provision may be waived, with the consent of the Holders of a majority in principal amount of the then outstanding notes of the affected series. Without consent of any Holder of a Security, the parties thereto may amend or supplement the Indenture to, among other things, cure any ambiguity or omission, to correct any defect or inconsistency, or to make any other change that does not adversely affect the rights of any Holder of a Security. Any such consent or waiver by the Holder of this Security (unless revoked as provided in the Indenture) shall be conclusive and binding upon such Holder and upon all future Holders and owners of this Security and any Securities which may be issued in exchange or substitution herefor, regardless of whether any notation thereof is made upon this Security or such other Securities.

10. Defaults and Remedies.

Certain events of bankruptcy or insolvency with respect to the Issuer are Events of Default that will result in the principal amount of the Securities, together with any accrued and unpaid interest thereon, becoming due and payable immediately upon the occurrence of such Events of Default. If any other Event of Default with respect to the Securities occurs and is continuing, then in every such case the Trustee or the Holders of not less than 25% in aggregate principal amount of the Securities then outstanding may declare the principal amount of all the Securities, together with any accrued and unpaid interest thereon, to be due and payable immediately in the manner and with the effect provided in the Indenture. Notwithstanding the preceding sentence, however, if at any time after such a declaration of acceleration has been made, the Holders of a majority in principal amount of the outstanding Securities, by written notice to the Trustee, may rescind such declaration and annul its consequences if the rescission would not conflict with any judgment or decree of a court of competent jurisdiction and if all

A-2-6

existing Events of Default with respect to the Securities, other than the nonpayment of the principal, premium, if any, or interest which has become due solely by such declaration acceleration, shall have been cured or shall have been waived. No such rescission shall affect any subsequent default or shall impair any right consequent thereon. Holders of Securities may not enforce the Indenture or the Securities except as provided in the Indenture. The Trustee may require indemnity or security satisfactory to it before it enforces the Indenture or the Securities. Subject to certain limitations, Holders of a majority in aggregate principal amount of the Securities then outstanding may direct the Trustee in its exercise of any trust or power.

11. Trustee Dealings with Issuer.

The Trustee under the Indenture, in its individual or any other capacity, may make loans to, accept deposits from, and perform services for the Issuer or its Affiliates, and may otherwise deal with the Issuer or its Affiliates as if it were not the Trustee.

12. Authentication.

This Security shall not be valid until the Trustee signs the certificate of authentication on the other side of this Security.

13. Abbreviations and Defined Terms.

Customary abbreviations may be used in the name of a Holder of a Security or an assignee, such as: TEN COM (tenant in common), TEN ENT (tenants by the entireties), JT TEN (joint tenants with right of survivorship and not as tenants in common), CUST (Custodian), and U/G/M/A (Uniform Gifts to Minors Act).

14. CUSIP Numbers.

Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Issuer has caused CUSIP numbers to be printed on the Securities as a convenience to the Holders of the Securities. No representation is made as to the accuracy of such number as printed on the Securities and reliance may be placed only on the other identification numbers printed hereon.

15. Absolute Obligation.

No reference herein to the Indenture and no provision of this Security or the Indenture shall alter or impair the obligation of the Issuer, which is absolute and unconditional, to pay the principal of, premium, if any, and interest on this Security in the manner, at the respective times, at the rate and in the coin or currency herein prescribed.

16. Governing Law.

This Security shall be construed in accordance with and governed by the laws of the State of New York.

A-2-7

17. Guarantee.

The Securities are fully and unconditionally guaranteed by the Subsidiary Guarantors as set forth in Article X of the Base Indenture.

The Issuer shall furnish to any Holder upon written request and without charge a copy of the Indenture. Requests may be made to:

Targa Resources Corp.

811 Louisiana St, Suite 2100

Houston, Texas 77002

Attn: Chief Financial Officer

A-2-8

ABBREVIATIONS

The following abbreviations, when used in the inscription on the face of this instrument, shall be construed as though they were written out in full according to applicable laws or regulations:

Additional abbreviations may also be used though not in the above list.

ASSIGNMENT

FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and transfer(s) unto

PLEASE INSERT SOCIAL SECURITY OR OTHER

IDENTIFYING NUMBER OF ASSIGNEE

PLEASE PRINT OR TYPE NAME AND ADDRESS INCLUDING POSTAL ZIP CODE OF ASSIGNEE:

the within Security and all rights thereunder, hereby irrevocably constituting and appointing to transfer said Security on the books of the Issuer, with full power of substitution in the premises.

Dated:                                                           

Signature:                                                     

A-2-9

SCHEDULE OF INCREASES OR DECREASES

IN GLOBAL SECURITY^*

The following increases or decreases in this Global Security have been made:

A-2-10

Exhibit 5.1

July 7, 2022

Targa Resources Corp.

811 Louisiana Street, Suite 2100

Houston, Texas 77002

Ladies and Gentlemen:

We have acted as counsel to Targa Resources Corp., a Delaware corporation (the “Company”), and the subsidiary guarantors set forth on Schedule I hereto (the “Covered Subsidiary Guarantors” and, together with Targa SouthOK NGL Pipeline LLC, an Oklahoma limited liability company, the “Subsidiary Guarantors”) with respect to certain legal matters in connection with the issuance by the Company of $750,000,000 aggregate principal amount of its 5.200% Senior Notes due 2027 (the “2027 Notes”) and $500,000,000 aggregate principal amount of its 6.250% Senior Notes due 2052 (the “2052 Notes” and, together with the 2027 Notes, the “Notes”) and the guarantee of the Notes (the “Guarantee” and, together with the Notes, the “Securities”) by the Subsidiary Guarantors, under the Indenture dated as of April 6, 2022 (the “Base Indenture”), by and among the Company, the Subsidiary Guarantors and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”), as supplemented by the Third Supplemental Indenture, dated as of July 7, 2022, setting forth the terms of the Notes (the “Third Supplemental Indenture” and, the Base Indenture as so supplemented, the “Indenture”), and pursuant to a registration statement on Form S-3 under the Securities Act of 1933, as amended (the “Act”), filed with the Securities and Exchange Commission (the “Commission”) on March 21, 2022 (Registration No. 333263730) (as may be amended and supplemented from time to time, the “Registration Statement”). This opinion is being furnished in connection with the requirements of Item 601(b)(5) of Regulation S-K under the Act, and no opinion is expressed herein as to any matter pertaining to the contents of the Registration Statement or related prospectus, other than as expressly stated herein with respect to the issuance of the Securities.

As such counsel, we have examined such matters of fact and questions of law as we have considered appropriate for purposes of this letter. With your consent, we have relied upon certificates and other assurances of officers of the Company and the Subsidiary Guarantors, as applicable, and others as to factual matters without having independently verified such factual matters. We are opining herein as to the internal laws of the States of New York and Texas, and the Delaware General Corporation Law, the Delaware Revised Uniform Limited Partnership Act and the Delaware Limited Liability Company Act, and we express no opinion with respect to the applicability thereto, or the effect thereon, of the laws of any other jurisdiction or, in the case of Delaware, any other laws, or as to any matters of municipal law or the laws of any local agencies within any state.

		July 7, 2022 Page 2

Subject to the foregoing and the other matters set forth herein, it is our opinion that, as of the date hereof, when the Securities have been duly executed, issued, and authenticated in accordance with the terms of the Indenture and delivered against payment therefor in the circumstances contemplated by the underwriting agreement, dated June 22, 2022, among the Company, the Subsidiary Guarantors and Mizuho Securities USA LLC, BofA Securities, Inc., J.P. Morgan Securities LLC and Wells Fargo Securities, LLC, as representatives of the several underwriters named therein, the Securities will have been duly authorized by all necessary corporate action of the Company and all necessary corporate, limited partnership or limited liability company action, as applicable, of the Covered Subsidiary Guarantors, and will be legally valid and binding obligations of the Company and the Subsidiary Guarantors, enforceable against the Company and the Subsidiary Guarantors in accordance with their terms.

Our opinion is subject to:

(a) the effects of bankruptcy, insolvency, reorganization, preference, fraudulent transfer, moratorium or other similar laws relating to or affecting the rights and remedies of creditors;

(b) the effects of general principles of equity, whether considered in a proceeding in equity or at law (including the possible unavailability of specific performance or injunctive relief), concepts of materiality, reasonableness, good faith, fair dealing and the discretion of the court before which a proceeding is brought;

(c) the invalidity under certain circumstances under law or court decisions of provisions for the indemnification of or contribution to a party with respect to a liability where such indemnification or contribution is contrary to public policy; and

(d) we express no opinion with respect to (i) consents to, or restrictions upon, governing law, jurisdiction, venue, service of process, arbitration, remedies or judicial relief; (ii) advance waivers of claims, defenses, rights granted by law, or notice, opportunity for hearing, evidentiary requirements, statutes of limitation, trial by jury or at law, or other procedural rights; (iii) waivers of rights or defenses contained in Section 4.05 of the Base Indenture and waivers of broadly or vaguely stated rights; (iv) covenants not to compete; (v) provisions for exclusivity, election or cumulation of rights or remedies; (vi) provisions authorizing or validating conclusive or discretionary determinations; (vii) grants of setoff rights; (viii) provisions to the effect that a guarantor is liable as a primary obligor, and not as a surety and provisions purporting to waive modifications of any guaranteed obligation to the extent such modification constitutes a novation; (ix) provisions for the payment of attorneys’ fees where such payment is contrary to law or public policy; (x) proxies, powers and trusts; (xi) provisions prohibiting, restricting, or requiring consent to assignment or transfer of any right or property; (xii) provisions for liquidated damages, default interest, late charges, monetary penalties, prepayment or make-whole premiums or other economic remedies to the extent such provisions are deemed to constitute a penalty; (xiii) provisions permitting, upon acceleration of any indebtedness (including the Notes), collection of that portion of the stated principal amount thereof that might be determined to constitute unearned interest thereon; and (xiv) the severability, if invalid, of provisions to the foregoing effect.

		July 7, 2022 Page 3

With your consent, we have assumed (a) that the Indenture and the Securities (collectively, the “Documents”) have been duly authorized, executed and delivered by the parties thereto other than the Company and the Covered Subsidiary Guarantors, (b) that the Documents constitute legally valid and binding obligations of the parties thereto other than the Company and the Covered Subsidiary Guarantors, enforceable against each of them in accordance with their respective terms, and (c) that the status of the Documents as legally valid and binding obligations of the parties is not affected by any (i) breaches of, or defaults under, agreements or instruments, (ii) violations of statutes, rules, regulations or court or governmental orders, or (iii) failures to obtain required consents, approvals or authorizations from, or make required registrations, declarations or filings with, governmental authorities.

This opinion is for your benefit in connection with the Registration Statement and may be relied upon by you and by persons entitled to rely upon it pursuant to the applicable provisions of the Act. We consent to your filing this opinion as an exhibit to the Company’s Current Report on Form 8-K dated July 7, 2022 and to the reference to our firm contained in the Registration Statement and related prospectus under the heading “Legal.” In giving such consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission thereunder.

Schedule I

Exhibit 5.2

July 7, 2022

Targa Resources Corp.

811 Louisiana Street, Suite 2100

Houston, Texas 77002

Ladies and Gentlemen:

We have acted as special Oklahoma counsel to Targa SouthOK NGL Pipeline LLC, an Oklahoma limited liability company (the “Oklahoma Subsidiary Guarantor”) with respect to certain Oklahoma legal matters in connection with the issuance by Targa Resources Corp., a Delaware corporation (the “Company”) of $750,000,000 aggregate principal amount of its 5.200% Senior Notes due 2027 (the “2027 Notes”) and $500,000,000 aggregate principal amount of its 6.250% Senior Notes due 2052 (the “2052 Notes” and, together with the 2027 Notes, the “Notes”) and the issuance of guarantees of the Notes by the Oklahoma Subsidiary Guarantor and the other subsidiary guarantors of the Company (the “Guarantee” and, together with the Notes, the “Securities”), under the Indenture dated as of April 6, 2022 (the “Base Indenture”), by and among the Company, the Oklahoma Subsidiary Guarantor, the other subsidiary guarantors of the Company (collectively, with the Oklahoma Subsidiary Guarantor, the “Subsidiary Guarantors”) and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”), as supplemented by the Third Supplemental Indenture, dated as of July 7, 2022, setting forth the terms of the Notes (the “Third Supplemental Indenture” and the Base Indenture as so supplemented, the “Indenture”), and pursuant to a registration statement on Form S-3 under the Securities Act of 1933, as amended (the “Act”), filed with the Securities and Exchange Commission (the “Commission”) on March 21, 2022 (Registration No. 333-263730), (as supplemented, the “Registration Statement”). This opinion is being furnished in connection with the requirements of Item 601(b)(5) of Regulation S-K under the Act, and no opinion is expressed herein as to any matter pertaining to the contents of the Registration Statement or related prospectus, other than as expressly stated herein with respect to the issuance of the Securities.

We have examined and relied on originals, or copies certified or otherwise identified to our satisfaction of the following documents (the “Reviewed Documents”):

Targa Resources Corp.

July 7, 2022

Page 2

(iv) the Certificate of Good Standing for the Oklahoma Subsidiary Guarantor dated June 27, 2022 (the “Good Standing Certificate”), and issued by the office of the Secretary of State of the State of Oklahoma (the “OK SOS”);

(v) copies of the Certificate of Limited Liability Company and Articles of Organization (and any amendments thereto) for the Oklahoma Subsidiary Guarantor, as certified by the OK SOS on June 27, 2022 (collectively, the “Articles of Organization”);

(vi) the Operating Agreement of Targa SouthOK NGL Pipeline LLC dated January 27, 2017 for the Oklahoma Subsidiary Guarantor (the “LLC Agreement” and together with the Articles of Organization, the “Organizational Documents”); and

(vii) the Unanimous Written Consent of the Board of Directors of Targa Downstream LLC as Sole Member of Targa NGL Pipeline Company LLC as Sole Member of the Oklahoma Subsidiary Guarantor, dated as of June 21, 2022 (the “Consent”) authorizing, among other things, the Guarantee of the Securities of the Issuer and the Oklahoma Subsidiary Guarantor’s entry into any and all documents that may hereafter be necessary to effectuate such Guarantee.

With your consent, we have examined and relied on originals or copies of such records of the Company and the Oklahoma Subsidiary Guarantor and such agreements, certificates of public officials, certificates of officers or other representatives of the Company and the Oklahoma Subsidiary Guarantor, and such other documents, certificates and records, as we have deemed necessary or appropriate as a basis for the opinions set forth herein, as to factual matters without having independently verified such factual matters. As to certain questions of fact where such facts were not otherwise verified or established, we have relied upon the accuracy of the various factual representations and warranties of the parties set forth in the Reviewed Documents, as well as the accuracy of the Good Standing Certificate and the Organizational Documents. We have made such investigations of law as we have deemed necessary and relevant as a basis hereof.

In rendering the opinions expressed herein, we have assumed the following to be true and have conducted no investigation to determine to the contrary:

We have assumed the legal capacity of all natural persons, the genuineness of all signatures, the authenticity of all documents, certificates and records submitted to us as originals, the conformity to authentic original documents, certificates and records of all documents, certificates and records submitted to us as copies, the truthfulness of all statements of fact contained therein, and the due authorization (except insofar as we opine below in opinion paragraph 3), execution and delivery of all documents where authorization, execution and delivery are prerequisites to the effectiveness of such documents. We have further assumed that the Organizational Documents have not been amended, supplemented or otherwise modified in any respect not reflected in the copies of the Organizational Documents provided to us.

Targa Resources Corp.

July 7, 2022

Page 3

Based on the foregoing and subject to the qualifications hereinafter set forth, we are of the opinion that:

1. The Oklahoma Subsidiary Guarantor has been duly formed, is validly existing and is in good standing as a limited liability company under the Oklahoma Limited Liability Company Act, 18 O.S. § 2000, et seq.

2. The Oklahoma Subsidiary Guarantor has the limited liability company power and authority to issue the Guarantee of the Securities.

3. The execution, delivery and performance of the Indenture and the issuance of the Guarantee with respect to the Indenture by the Oklahoma Subsidiary Guarantor will be duly authorized by all necessary limited liability company action of the Oklahoma Subsidiary Guarantor when (a) the specific terms of a particular series of Securities and related Guarantees have been duly established in accordance with the terms of the Indenture and authorized by all necessary limited liability company action of the Oklahoma Subsidiary Guarantor; and (b) the series of Securities to which the Guarantee relates shall have been duly issued by the Company.

All of our foregoing opinions are subject to the following qualifications and we except therefrom any opinion concerning such qualifications.

1. Our opinions in opinion paragraph 1 with respect to due formation, valid existence and good standing of the Oklahoma Subsidiary Guarantor are based solely on our review of the Organizational Documents and the Good Standing Certificate.

2. Our opinions expressed herein are limited to the terms and provisions of the Reviewed Documents, as applicable, expressly and fully set out therein and without giving effect to the terms and provisions of any other instrument by reference made a part thereof. You are hereby advised that we assume no responsibility and express no opinion for any provision of any document or agreement which we have not reviewed but that might be referred to in the documents reviewed, which may affect any opinion we have given herein.

3. The opinions expressed herein are limited to the laws of the State of Oklahoma and are specifically limited to the present laws of the State of Oklahoma. We express no opinion with respect to issues subject to or governed by New York law or the laws of any other state. We express no opinion as to whether the laws of any jurisdiction, other than the State of Oklahoma, are applicable to the subject matter hereof. We are not rendering any opinion as to compliance with any federal or state law, rule or regulation relating to securities, or to the sale or issuance thereof.

4. This opinion letter sets forth our professional judgments as to the matters set forth herein and you may rely upon the matters set forth herein as a legal opinion only. In expressing the conclusions set forth in this opinion letter, we have not intended to and do not render any guarantees or warranties of the matters discussed in this opinion letter.

Targa Resources Corp.

July 7, 2022

Page 4

5. We do not undertake to update this opinion letter or to advise you of any changes in the laws of the State of Oklahoma that could affect the conclusions set forth herein. This opinion letter is limited to the matters expressly stated herein and no opinions may be inferred or implied beyond the matters expressly stated herein.

This opinion letter is for your benefit in connection with the Registration Statement and may be relied upon by you and by persons entitled to rely upon it pursuant to the applicable provisions of the Act. We consent to your filing this opinion letter as an exhibit to the Company’s Current Report on Form 8-K dated July 7, 2022 and to the reference to our firm contained in the Registration Statement and related prospectus under the heading “Legal.” In giving such consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission thereunder. This opinion letter may be relied upon by Vinson & Elkins L.L.P. as if it were addressed to it, for the sole purpose of rendering its opinion letter in connection with the offer and sale of the Securities.