SIXTH SUPPLEMENTAL INDENTURE March 25, 2024 between THE NARRAGANSETT ELECTRIC COMPANY (D/B/A RHODE ISLAND ENERGY), as Company and THE BANK OF NEW YORK MELLON, as Trustee, Paying Agent and Securities Registrar $500,000,000 5.350% Senior Notes due 2034 Exhibit 4.2

TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION .......1 Section 1.1 Definitions................................................................................................................1 Section 1.2 Conflict with Trust Indenture Act ............................................................................4 Section 1.3 Effect of Headings and Table of Contents ...............................................................5 Section 1.4 Successors and Assigns............................................................................................5 Section 1.5 Separability Clause ..................................................................................................5 Section 1.6 Benefits of Sixth Supplemental Indenture ...............................................................5 Section 1.7 Governing Law ........................................................................................................5 Section 1.8 Execution in Counterparts........................................................................................5 Section 1.9 Recitals by the Company .........................................................................................5 Section 1.10 Ratification and Incorporation of Base Indenture ....................................................6 Section 1.11 Subsequent Amendments .........................................................................................6 Section 1.12 Electronic Communications .....................................................................................6 ARTICLE II AMENDMENTS TO THE BASE INDENTURE......................................................7 Section 2.1 Certain Terms Defined .............................................................................................7 Section 2.2 Addresses for Notices ..............................................................................................7 Section 2.3 Reports by the Company ..........................................................................................8 ARTICLE III DESIGNATED SECURITIES ..................................................................................9 Section 3.1 Creation of Designated Securities ............................................................................9 Section 3.2 Aggregate Principal Amount of Designated Securities ...........................................9 Section 3.3 Payment of Principal ..............................................................................................10 Section 3.4 Interest and Interest Rate .......................................................................................10 Section 3.5 Taxation .................................................................................................................11 Section 3.6 Paying Agent ..........................................................................................................11 Section 3.7 Place of Payment....................................................................................................14 Section 3.8 Denominations .......................................................................................................15 Section 3.9 Form; Terms...........................................................................................................15 Section 3.10 Transfer and Exchange ..........................................................................................16 Exhibit A Form of Designated Security....................................................................................1 Exhibit B Form of Certificate of Transfer ................................................................................1 Exhibit C Form of Certificate of Exchange ..............................................................................1

1 This Sixth Supplemental Indenture, dated as of March 25, 2024 (the “Sixth Supplemental Indenture”), between The Narragansett Electric Company (d/b/a Rhode Island Energy), a Rhode Island company (the “Company”), and The Bank of New York Mellon, a New York banking corporation duly organized and existing under the laws of the State of New York, as trustee (the “Trustee”), paying agent (the “Paying Agent”) and registrar (the “Securities Registrar”). Whereas: (A) the Company has heretofore entered into an Indenture, dated as of March 22, 2010 (the “Base Indenture”), a First Supplemental Indenture, dated as of March 22, 2010 (the “First Supplemental Indenture”), a Second Supplemental Indenture, dated as of March 22, 2010 (the “Second Supplemental Indenture”), a Third Supplemental Indenture, dated as of December 10, 2012 (the “Third Supplemental Indenture”), a Fourth Supplemental Indenture, dated as of July 27, 2018 (the “Fourth Supplemental Indenture”), and a Fifth Supplemental Indenture, dated as of April 9, 2020 (the “Fifth Supplemental Indenture”), with the Trustee; (B) the Company wishes to make certain changes to the Base Indenture as it relates to future issuances (including the Securities to be created under this Sixth Supplemental Indenture), and the Base Indenture, as supplemented by the First Supplemental Indenture, the Second Supplemental Indenture, the Third Supplemental Indenture, the Fourth Supplemental Indenture, the Fifth Supplemental Indenture and this Sixth Supplemental Indenture, is herein called the “Indenture”; (C) pursuant to Sections 3.1 and 10.1 of the Base Indenture, the Company proposes to create a new series of Securities under the Indenture; (D) the Company hereby resolves to issue the Designated Securities (as such term is defined in Section 3.1 hereof) in an aggregate principal amount of $500,000,000 and with the terms and conditions set forth in this Sixth Supplemental Indenture; and (E) all things necessary to make this Sixth Supplemental Indenture a valid agreement of the Company, in accordance with its terms, have been done; Now, therefore, for and in consideration of the premises and the purchases of the Designated Securities by the Holders thereof, it is mutually covenanted and agreed, for the equal and proportionate benefit of all Holders of Designated Securities, as follows: ARTICLE I DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION Section 1.1 Definitions For all purposes of this Sixth Supplemental Indenture, except as otherwise expressly provided or unless the context otherwise requires: (a) the terms defined in this Article have the meanings assigned to them in this Article and include the plural as well as the singular;

2 (b) all other terms used herein which are defined in the Trust Indenture Act, either directly or by reference therein, have the meanings assigned to them therein; (c) unless the context otherwise requires, any reference to an “Article” or a “Section” refers to an Article or a Section, as the case may be, of this Sixth Supplemental Indenture; (d) the words “herein”, “hereof” and “hereunder” and other words of similar import refer to this Sixth Supplemental Indenture as a whole and not to any particular Article, Section or other subdivision; and (e) all terms used but not defined in this Sixth Supplemental Indenture, which are defined in the Base Indenture, shall have the meanings assigned to them in the Base Indenture. “Additional Designated Securities” has the meaning ascribed in Section 3.2. “Applicable Procedures” means, with respect to any transfer or exchange of or for beneficial interests in any Global Security, the rules and procedures of the Depository, Euroclear and/or Clearstream, Luxembourg that apply to such transfer or exchange. “Authorized Officer” has the meaning ascribed in Section 1.12. “Business Day” means each day which is not a Legal Holiday. “Clearstream, Luxembourg” means Clearstream Banking, S.A., and its successors. “Definitive Security” means a certificated Designated Security registered in the name of the Holder thereof and issued in accordance with Section 3.10 hereof, substantially in the form of Exhibit A hereto, except that such Designated Security shall not bear the Global Security Legend and shall not have the “Schedule of Exchanges of Interests in the Global Security” attached thereto. “Depository” means The Depository Trust Company and its successors. “Designated Securities” has the meaning ascribed in Section 3.1. “Electronic Means” shall mean the following communications methods: e-mail, secure electronic transmission containing applicable authorization codes, passwords and/or authentication keys issued by the Trustee, or another method or system specified by the Trustee as available for use in connection with its services hereunder. “Euroclear” means Euroclear Bank, SA/NV, as operator of the Euroclear System. “Global Security Legend” means the legend set forth in Section 3.10(f)(ii) hereof, which is required to be placed on all Global Securities issued under this Sixth Supplemental Indenture.

3 “Global Securities” means, individually and collectively, each of the Restricted Global Securities and the Unrestricted Global Securities deposited with or on behalf of and registered in the name of the Depository or its nominee, substantially in the form of Exhibit A hereto, and that bears the Global Security Legend and that has the “Schedule of Exchanges of Interests in the Global Security” attached thereto, issued in accordance with the Indenture. “Indirect Participant” means a Person who holds a beneficial interest in a Global Security through a Participant. “Initial Designated Securities” has the meaning ascribed in Section 3.2. “Instructions” has the meaning ascribed in Section 1.12. “Interest Payment Date” has the meaning ascribed in Section 3.4(b). “Issue Date” means March 25, 2024. “Legal Holiday” means a Saturday, a Sunday or a day on which commercial banking institutions are not required to be open in the State of New York. “Non-U.S. Person” means a Person who is not a U.S. Person. “Participant” means, with respect to the Depository, Euroclear or Clearstream, Luxembourg, a Person who has an account with the Depository, Euroclear or Clearstream, Luxembourg, respectively (and, with respect to DTC, shall include Euroclear and Clearstream, Luxembourg, as Indirect Participant). “Private Placement Legend” means the legend set forth in Section 3.10(f)(i) hereof. “QIB” means a “qualified institutional buyer” as defined in Rule 144A. “Regular Record Date” means, with respect to the applicable Interest Payment Date, the close of business on the preceding April 15 and October 15, as the case may be. “Regulation S” means Regulation S promulgated under the Securities Act. “Regulation S Global Security” means a Regulation S Temporary Global Security or Regulation S Permanent Global Security, as appropriate. “Regulation S Permanent Global Security” means a permanent Global Security in the form of Exhibit A hereto, bearing the Global Security Legend and the Private Placement Legend and deposited with or on behalf of and registered in the name of the Depository or its nominee, issued in a denomination equal to the outstanding principal amount of the Regulation S Temporary Global Security upon expiration of the Restricted Period. “Regulation S Temporary Global Security” means a temporary Global Security in the form of Exhibit A hereto, bearing the Global Security Legend, the Private Placement

4 Legend and the Regulation S Temporary Global Security Legend and deposited with or on behalf of and registered in the name of the Depository or its nominee, issued in a denomination equal to the outstanding principal amount of the Designated Securities initially sold in reliance on Rule 903. “Regulation S Temporary Global Security Legend” means the legend set forth in Section 3.10(f)(iii) hereof. “Restricted Definitive Security” means a Definitive Security bearing the Private Placement Legend. “Restricted Global Security” means a Global Security bearing the Private Placement Legend. “Restricted Period” means the 40-day distribution compliance period as defined in Regulation S. “Rule 144” means Rule 144 promulgated under the Securities Act. “Rule 144A” means Rule 144A promulgated under the Securities Act. “Rule 903” means Rule 903 promulgated under the Securities Act. “Rule 904” means Rule 904 promulgated under the Securities Act. “Sixth Supplemental Indenture” means this instrument as originally executed or as it may from time to time be supplemented or amended in accordance with the terms of the Base Indenture. “Stated Maturity” means May 1, 2034. “Unrestricted Definitive Security” means one or more Definitive Securities that do not bear and are not required to bear the Private Placement Legend. “Unrestricted Global Security” means a permanent Global Security, substantially in the form of Exhibit A hereto, that bears the Global Security Legend and that has the “Schedule of Exchanges of Interests in the Global Security” attached thereto, and that is deposited with or on behalf of and registered in the name of the Depository, representing Global Securities that do not bear and are not required to bear the Private Placement Legend. “U.S. Person” means a U.S. person as defined in Rule 902(k) promulgated under the Securities Act. Section 1.2 Conflict with Trust Indenture Act If and to the extent that any provision of this Sixth Supplemental Indenture limits, qualifies or conflicts with a provision of the Trust Indenture Act that is required under the Trust Indenture

5 Act to be a part of and govern this Sixth Supplemental Indenture, the latter provision shall control. If any provision of this Sixth Supplemental Indenture modifies or excludes any provision of the Trust Indenture Act that may be so modified or excluded, the former provision shall control. Section 1.3 Effect of Headings and Table of Contents The Article and Section headings herein and the Table of Contents are for convenience only and shall not affect the construction hereof. Section 1.4 Successors and Assigns All covenants and agreements in this Sixth Supplemental Indenture by the Company shall bind its successors and assigns, whether so expressed or not. Section 1.5 Separability Clause In case any provision in this Sixth Supplemental Indenture shall be invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired thereby. Section 1.6 Benefits of Sixth Supplemental Indenture Nothing in the Indenture or the Designated Securities, express or implied, shall give to any Person, other than the parties hereto and their successors hereunder and the Holders of Designated Securities, any benefit or any legal or equitable right, remedy or claim under the Indenture. Section 1.7 Governing Law This Sixth Supplemental Indenture and the Designated Securities shall be governed by, and construed in accordance with, the laws of the State of New York. Section 1.8 Execution in Counterparts This Sixth Supplemental Indenture may be executed in any number of counterparts, each of which so executed shall be deemed to be an original, but all such counterparts shall together constitute but one and the same instrument, and signature pages may be delivered by facsimile, electronic mail (including any electronic signature complying with the U.S. federal ESIGN Act of 2000, Uniform Electronic Transaction Act, the New York Electronic Signatures and Records Act (N.Y. State Tech. §§ 301-309), as amended from time to time, or other applicable law) or other transmission method. Section 1.9 Recitals by the Company The recitals in this Sixth Supplemental Indenture are made by the Company only and not by the Trustee, and all of the provisions contained in the Base Indenture in respect of the rights, privileges, immunities, powers and duties of the Trustee shall be applicable in respect of the

6 Designated Securities and of this Sixth Supplemental Indenture as fully and with like effect as if set forth herein in full. Section 1.10 Ratification and Incorporation of Base Indenture As supplemented hereby, the Base Indenture, as supplemented by the First Supplemental Indenture, the Second Supplemental Indenture, the Third Supplemental Indenture, the Fourth Supplemental Indenture and the Fifth Supplemental Indenture, is in all respects ratified and confirmed, and the Base Indenture, as supplemented by the First Supplemental Indenture, the Second Supplemental Indenture, the Third Supplemental Indenture, the Fourth Supplemental Indenture, the Fifth Supplemental Indenture, and this Sixth Supplemental Indenture shall be read, taken and construed as one and the same instrument. Section 1.11 Subsequent Amendments To the extent any provision of the Base Indenture, as previously amended prior to the date hereof, is amended or modified by this Sixth Supplemental Indenture, such amendment or modification shall supersede any amendment or modification to such provision effected by the First Supplemental Indenture, the Second Supplemental Indenture, the Third Supplemental Indenture, the Fourth Supplemental Indenture or the Fifth Supplemental Indenture in respect of any series of Securities issued under the Base Indenture on or after the date hereof. Section 1.12 Electronic Communications The Trustee shall have the right to accept and act upon instructions, including funds transfer instructions (“Instructions”) given pursuant to the Indenture, consistent with the Trustee’s internal practices and procedures and delivered using Electronic Means; provided, however, that the Company shall provide to the Trustee an incumbency certificate listing officers with the authority to provide such Instructions (“Authorized Officers”) and containing specimen signatures of such Authorized Officers, which incumbency certificate shall be amended by the Company whenever a person is to be added or deleted from the listing. If the Company elects to give the Trustee Instructions using Electronic Means and the Trustee in its reasonable discretion elects to act upon such Instructions, the Trustee’s understanding of such Instructions shall be deemed controlling. The Company understands and agrees that the Trustee cannot determine the identity of the actual sender of such Instructions and that, so long as such presumption is reasonable, the Trustee shall conclusively presume that directions that purport to have been sent by an Authorized Officer listed on the incumbency certificate provided to the Trustee have been sent by such Authorized Officer. The Company shall be responsible for ensuring that only Authorized Officers transmit such Instructions to the Trustee and that the Company and all Authorized Officers are solely responsible to safeguard the use and confidentiality of applicable user and authorization codes, passwords and/or authentication keys upon receipt by the Company. The Trustee shall not be liable for any losses, costs or expenses arising directly or indirectly from the Trustee’s reasonable reliance upon and compliance with such Instructions notwithstanding such directions conflict or are inconsistent with a subsequent written instruction, except for any such losses, costs or expenses due to the Trustee’s gross negligence or willful misconduct. The Company agrees: (i) to assume all risks arising out of the use of Electronic Means to submit Instructions to the Trustee, including without limitation the risk of the Trustee

7 acting on unauthorized Instructions, and the risk of interception and misuse by third parties, but excluding those arising from the Trustee’s gross negligence or willful misconduct; (ii) that it is fully informed of the protections and risks associated with the various methods of transmitting Instructions to the Trustee and that there may be more secure methods of transmitting Instructions than the method(s) selected by the Company; (iii) that the security procedures (if any) to be followed in connection with its transmission of Instructions provide to it a commercially reasonable degree of protection in light of its particular needs and circumstances; and (iv) to notify the Trustee immediately upon learning of any compromise or unauthorized use of the security procedures. Notwithstanding any other provision of this Indenture or any Security, where this Indenture or any Security provides for notice of any event or any other communication (including any notice of redemption or repurchase) to a holder of a Global Security (whether by mail or otherwise), such notice shall be sufficiently given if given to the Depository (or its designee) pursuant to the standing instructions from the Depository or its designee, including by electronic mail in accordance with accepted practices at the Depository. ARTICLE II AMENDMENTS TO THE BASE INDENTURE Section 2.1 Certain Terms Defined With respect to any series of Securities issued under the Base Indenture on or after the date hereof, including the Designated Securities, Section 1.1 of the Base Indenture is hereby amended in part to amend and restate the following definition in its entirety, which shall read as follows: Section 1.1 Certain Terms Defined “Corporate Trust Office” means the principal office of the Trustee at which at any particular time its corporate trust business shall be administered, which office, on the date of original execution of this Indenture, is located at The Bank of New York Mellon, 240 Greenwich Street, Floor 7-E, New York, New York 10286, Attention: Corporate Trust Administration—Rhode Island Energy 5.350% Senior Notes due 2034 or at any other time at such other address as the Trustee may designate from time to time by notice to the parties hereto, or at the principal corporate trust office of any successor trustee as to which such successor trustee may notify the parties hereto in writing. Section 2.2 Addresses for Notices With respect to any series of Securities issued under the Base Indenture on or after the date hereof, including the Designated Securities, Section 13.5 of the Base Indenture is hereby amended and restated in part to amend and restate the first paragraph in its entirety, which shall read as follows:

8 Section 13.5 Address for Notices Any notice or demand which by any provision of this Indenture is required or permitted to be given or delivered by the Trustee or by the Holders of Securities of any series on the Company may be given or served by registered mail or facsimile addressed (until another address is filed by the Company with the Trustee) as follows: The Narragansett Electric Company (d/b/a Rhode Island Energy), c/o PPL Services Corporation, Two North Ninth Street, Allentown, Pennsylvania, 18101-1179, Attention: Treasury, with a copy to Davis Polk & Wardwell LLP, 450 Lexington Avenue, New York, New York 10017; Attention: Michael Kaplan, Email (which shall not constitute notice): michael.kaplan@davispolk.com. Any notice, direction, request or demand by the Company or any Holders of Securities of any series to or upon the Trustee shall be deemed to have been sufficiently given or made, for all purposes, if received at the Corporate Trust Office of such Trustee. Section 2.3 Reports by the Company With respect to the Designated Securities, Section 5.3 of the Base Indenture is hereby amended and restated in its entirety, which shall read as follows: Section 5.3 Reports by the Company. Unless otherwise specified with respect to Securities of a particular series pursuant to Section 3.1, so long as any Securities of such series are outstanding, if not filed electronically with the SEC through the SEC’s Electronic Data Gathering, Analysis, and Retrieval System (or any successor system), the Company will furnish to the Trustee and, upon request to the Trustee, Holders of Securities of such series, within 180 days of the end of each fiscal year for annual reports and within 75 days of the end of each fiscal quarter for quarterly reports: (1) an annual report including solely the following information: annual consolidated financial statements of the Company (including balance sheets as of the end of the two most recent fiscal years and statements of earnings and statements of cash flows for the three most recent fiscal years) prepared in accordance with GAAP as in effect from time to time, and a report on the annual financial statements by the Company’s certified independent accountants; and (2) quarterly reports including solely the following information: quarterly consolidated financial statements of the Company (including a balance sheet as of the end of the most recent fiscal quarter and statements of earnings and statements of cash flows for the period from the end of the most recent fiscal year to the end of the most recent fiscal quarter, and for the corresponding interim period of the preceding fiscal year) prepared in accordance with GAAP as in effect from time to time. With respect to the information set forth in paragraphs (1) and (2) immediately above, the Company shall post copies of such information on PPL

9 Corporation’s website (or by similar publicly available means) for so long as any Securities of any particular series remain outstanding. Furthermore, so long as such information is so posted, the related delivery requirements set forth above shall be deemed satisfied. In addition, the Company will, for so long as any Securities of any particular series remain outstanding and during any period during which the Company is not subject to Section 13 or Section 15(d) of the Exchange Act, it will furnish to Holders of Securities of such series and to prospective purchasers of Securities of such series, upon their request, the information required to be delivered pursuant to Rule 144A(d)(4) under the Securities Act. The delivery of such reports, information and documents to the Trustee pursuant to this Section 5.3 is for informational purposes only and the Trustee's receipt of such shall not constitute actual or constructive notice or knowledge of any information contained therein or determinable from information contained therein, including the Company's compliance with any of its covenants hereunder (as to which the Trustee is entitled to rely exclusively on Officer’s Certificates) other than with respect to Section 7.2. ARTICLE III DESIGNATED SECURITIES Section 3.1 Creation of Designated Securities There is hereby created a new series of Securities to be issued under the Indenture, to be designated as “5.350% Senior Notes due 2034” (the “Designated Securities”). Section 3.2 Aggregate Principal Amount of Designated Securities The aggregate principal amount of the Designated Securities shall initially be limited to $500,000,000 (except for Designated Securities authenticated and delivered upon registration of transfer of, or in exchange for, or in lieu of, other Designated Securities pursuant to Sections 2.4, 3.6, 3.7, 3.10, 10.6 or 14.3 of the Base Indenture and except for any Designated Securities which, pursuant to Section 3.3 of the Base Indenture, are deemed never to have been authenticated and delivered under the Indenture) (the “Initial Designated Securities”).The Company may create and issue an unlimited amount of additional Designated Securities from time to time, without notice to or the consent of the Holders of the Designated Securities, having the same terms and conditions in all material respects as the related Initial Designated Securities (“Additional Designated Securities”). Any Additional Designated Securities shall be consolidated with and form a single class with the related Initial Designated Securities and have the same terms as to status, redemption or otherwise as the related Initial Designated Securities. Any Additional Designated Securities issued with the same CUSIP, ISIN or other identifying number as that of the related Initial Designated Securities shall be fungible for U.S. federal income tax purposes. The period of any resale restriction applicable to the Initial Designated Securities offered and sold in reliance on Rule 144A may be extended to the last day of the period of any resale restrictions imposed on any such Additional Designated Securities that are issued with the same