Document

Exhibit 4.6

TWENTY-FOURTH SUPPLEMENTAL INDENTURE
SUBSIDIARY GUARANTEES

TWENTY-FOURTH SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of February 25, 2026, among the subsidiary guarantors listed on Schedule 1 hereto (the “Guaranteeing Subsidiaries”), Vistra Operations Company LLC, a Delaware limited liability company (the “Company”), the other subsidiary guarantors party hereto and Wilmington Trust, National Association, as trustee under the indenture referred to below (the “Trustee”).

W I T N E S S E T H

WHEREAS, the Company has heretofore executed and delivered to the Trustee (i) that certain Indenture (the “Base Indenture”), dated as of June 11, 2019, among the Company and the Trustee, (ii) that certain Supplemental Indenture (the “First Supplement”), dated as of June 11, 2019, among the Company, the Subsidiary Guarantors party thereto and the Trustee, providing for the original issuance of an aggregate principal amount of $1,200,000,000 of 3.55% Senior Secured Notes due 2024 and aggregate principal amount of $800,000,000 of 4.30% Senior Secured Notes due 2029 (the “2029 Notes”), (iii) that certain Fourth Supplemental Indenture, dated as of November 15, 2019, among the Company, the Subsidiary Guarantors party thereto and the Trustee, providing for the issuance of $800,000,000 of 3.70% Senior Secured Notes due 2027 (the “2027 Notes”) (the “Fourth Supplement”), (iv) that certain Fourteenth Supplemental Indenture, dated as of September 26, 2023, among the Company, the Subsidiary Guarantors party thereto and the Trustee, providing for the issuance of an aggregate principal amount of $1,050,000,000 of 6.950% Senior Secured Notes due 2033 (the “2033 Notes”) (the “Fourteenth Supplement”), (v) that certain Seventeenth Supplemental Indenture, dated as of April 12, 2024, among the Company, the Subsidiary Guarantors party thereto and the Trustee, providing for the issuance of an aggregate principal amount of $500,000,000 of 6.000% Senior Secured Notes due 2034 (the “2034 6.000% Notes”) (the “Seventeenth Supplement”), (vi) that certain Eighteenth Supplemental Indenture, dated as of December 4, 2024, among the Company, the Subsidiary Guarantors party thereto and the Trustee, providing for the issuance of an aggregate principal amount of $500,000,000 of 5.050% Senior Secured Notes due 2026 (the “2026 Notes”) and aggregate principal amount of $750,000,000 of 5.700% Senior Secured Notes due 2034 (the “2034 5.700% Notes”) (the “Eighteenth Supplement”), (vii) that certain Twenty-First Supplemental Indenture, dated as of October 10, 2025, among the Company, the Subsidiary Guarantors party thereto and the Trustee, providing for the issuance of an aggregate principal amount of $750,000,000 of 4.300% Senior Secured Notes due 2028 (the “2028 Notes”), an aggregate principal amount of $500,000,000 of 4.600% Senior Secured Notes due 2030 (the “2030 Notes”) and an aggregate principal amount of $750,000,000 of 5.250% Senior Secured Notes due 2035 (the “2035 Notes”) (the “Twenty-First Supplement”) and (viii) that certain Twenty-Third Supplemental Indenture, dated as of January 22, 2026, among the Company, the Subsidiary Guarantors party thereto and the Trustee, providing for the issuance of an aggregate principal amount of $1,000,000,000 of 4.700% Senior Secured Notes due 2031 (the “2031 Notes”) and an aggregate principal amount of $1,250,000,000 of 5.350% Senior Secured Notes due 2036 (the “2036 Notes” and, collectively with the 2029 Notes, the 2027 Notes, the 2033 Notes, the 2034 6.000% Notes, the 2026 Notes, the 2034 5.700% Notes, the 2028 Notes, the 2030 Notes, the 2035 Notes and the 2031 Notes, the “Notes”) (the “Twenty-Third Supplement” and, collectively with the Base Indenture, the First Supplement, the Fourth Supplement, the Fourteenth Supplement, the Seventeenth Supplement, the Eighteenth Supplement and the Twenty-First Supplement, the “Indenture”);

WHEREAS, the Indenture provides that under certain circumstances the Guaranteeing Subsidiaries shall execute and deliver to the Trustee a supplemental indenture pursuant to which the Guaranteeing Subsidiaries shall unconditionally guarantee all of the Company’s Obligations under the Notes and the Indenture; and

WHEREAS, pursuant to Section 9.01 of the Base Indenture and Sections 4.07 and 9.01 of the First Supplement, the Fourth Supplement, the Fourteenth Supplement, the Seventeenth Supplement, the Eighteenth Supplement, the Twenty-First Supplement and the Twenty-Third Supplement, the Trustee, the Company and the other Subsidiary Guarantors are authorized and required to execute and deliver this Supplemental Indenture.

NOW THEREFORE, in consideration of the foregoing and for good and valuable consideration, the receipt of which is hereby acknowledged, the Guaranteeing Subsidiaries, the Trustee, the Company and the other Subsidiary Guarantors mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

1. Capitalized Terms. Unless otherwise defined in this Supplemental Indenture, capitalized terms used herein without definition shall have the meanings assigned to them in the Base Indenture, the First Supplement, the Fourth Supplement, the Fourteenth Supplement, the Seventeenth Supplement, the Eighteenth Supplement, the Twenty-First Supplement or the Twenty-Third Supplement, as applicable.

2. Agreement to be Bound; Guarantee. The Guaranteeing Subsidiaries hereby become party to the Indenture as Subsidiary Guarantors and as such will have all of the rights and be subject to all of the Obligations and agreements of Subsidiary Guarantors under the Indenture. The Guaranteeing Subsidiaries hereby agree to be bound by all of the provisions of the Indenture applicable to Subsidiary Guarantors and to perform all of the Obligations and agreements of Subsidiary Guarantors under the Indenture. In furtherance of the foregoing, the Guaranteeing Subsidiaries shall be deemed Subsidiary Guarantors for purposes of Article 10 of the First Supplement, the Fourth Supplement, the Fourteenth Supplement, the Seventeenth Supplement, the Eighteenth Supplement, the Twenty-First Supplement and the Twenty-Third Supplement, including, without limitation, Section 10.02 thereof.

3. NEW YORK LAW TO GOVERN. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

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

5. Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof.

6. The Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing Subsidiaries and the Company.

7. Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of

the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby.

[Signature Page Follows]

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and attested, all as of the date first above written.

Beaver Falls Energy Storage, LLC

Beaver Falls, L.L.C.

Carneys Point Energy Storage, L.L.C.

Edgewater Generation Holdings, L.L.C.

Edgewater Generation, L.L.C.

Fairless Energy, L.L.C.

Garrison Energy Center LLC

Geranium Energy Storage I, L.L.C.

Geranium Energy Storage II, L.L.C.

Greenleaf Energy Unit 2 LLC

Hazleton Generation LLC

Hazleton Holdco, L.L.C

Logan Energy Storage, L.L.C.

Manchester Street, L.L.C.

NatGas California, L.L.C.

NatGas Greenleaf Holdings, L.L.C.

SBF New York, L.L.C.

SBFH Holdco, L.L.C.

Syracuse Energy Storage, LLC

Syracuse, L.L.C.

Verbena Energy Storage, L.L.C.,

as the Guaranteeing Subsidiaries

By: /s/ William M. Quinn

Name: William M. Quinn

Title: Senior Vice President and Treasurer

Vistra Operations Company LLC,

as the Company

By: /s/ William M. Quinn

Name: William M. Quinn

Title: Senior Vice President and Treasurer

Ambit California, LLC

Ambit Energy Holdings, LLC

Ambit Holdings, LLC

Ambit Illinois, LLC

Ambit Marketing, LLC

Ambit Midwest, LLC

Ambit New York, LLC

[Signature Page to Twenty-Fourth Supplemental Indenture]

Ambit Northeast, LLC

Ambit Texas, LLC

Angus Solar, LLC

Bellingham Power Generation LLC

Big Brown Power Company LLC

Big Sky Gas Holdings, LLC

Big Sky Gas LLC

Blackstone Power Generation LLC

BlueGen 1 LLC

BlueNet Holdings, LLC

Calumet Energy Team, LLC

Casco Bay Energy Company, LLC

Coffeen and Western Railroad Company

Coleto Creek Energy Storage LLC

Coleto Creek Power, LLC

Comanche Peak Power Company LLC

Connecticut Gas & Electric, LLC

Core Solar SPV I, LLC

Crius Energy Holdings, LLC

Crius Energy, LLC

Crius Solar Fulfillment, LLC

Dallas Power & Light Company, Inc.

Deer Creek Solar I LLC

Dicks Creek Power Company LLC

Dynegy Coal Holdco, LLC

Dynegy Coal Trading & Transportation, L.L.C.

Dynegy Conesville, LLC

Dynegy Energy Services (East), LLC

Dynegy Energy Services Mid-Atlantic, LLC (f/k/a Everyday Energy NJ, LLC)

Dynegy Energy Services, LLC

Dynegy Killen, LLC

Dynegy Marketing and Trade, LLC

Dynegy Midwest Generation, LLC

Dynegy Operating Company

Dynegy Power Marketing, LLC

Dynegy Resources Generating Holdco, LLC

Dynegy South Bay, LLC

Dynegy Stuart, LLC

Edwards Energy Storage Phase 2 LLC

Energy Harbor Generation LLC

Energy Harbor Holdings LLC (f/k/a Energy Harbor Corp.)

Energy Harbor LLC

Energy Harbor Nuclear Generation LLC

Energy Rewards, LLC

Energy Services Providers, LLC

Ennis Power Company, LLC

EquiPower Resources Corp.

[Signature Page to Twenty-Fourth Supplemental Indenture]

Everyday Energy, LLC

Fayette Power Company LLC

Forest Grove Solar LLC

Fort Massac Energy Storage LLC

Freedomgen 1 LLC

Generation SVC Company

Hanging Rock Power Company LLC

Hays Energy, LLC

Hopewell Power Generation, LLC

Illinois Power Generating Company

Illinois Power Marketing Company, LLC

Illinois Power Resources Generating, LLC

Illinois Power Resources, LLC

Illinova Corporation

IPH, LLC

Kendall Power Company LLC

Kincaid Generation, L.L.C.

Kincaid Island Solar LLC

La Frontera Holdings, LLC

Lake Road Generating Company, LLC

Liberty Electric Power, LLC

Lone Star Energy Company, Inc.

Lone Star Pipeline Company, Inc.

Luminant Administrative Services Company

Luminant Coal Generation LLC

Luminant Commercial Asset Management LLC

Luminant Energy Company LLC

Luminant Energy Trading California Company

Luminant ET Services Company LLC

Luminant Gas Imports LLC

Luminant Generation Company LLC

Luminant Mining Company LLC

Luminant Power Generation, LLC

Luminant Power LLC

Massachusetts Gas & Electric, LLC

Masspower, LLC

Miami Fort Power Company LLC

Midlothian Energy, LLC

Milford Power Company, LLC

Morro Bay Energy Storage 1, LLC

Morro Bay Energy Storage 2, LLC

Morro Bay Power Company LLC

Moss Landing Energy Storage 4, LLC

Moss Landing Power Company LLC

NCA Land Holdings, LLC (f/k/a Maroon Farmer, LLC)

NCA Resources Development Company LLC

NEPCO Services Company

Northeastern Power Company

[Signature Page to Twenty-Fourth Supplemental Indenture]

Oak Grove Management Company LLC

Oak Hill Solar II LLC

Oakland Energy Storage 1, LLC

Oakland Energy Storage 2, LLC

Oakland Energy Storage 3, LLC

Oakland Power Company LLC

Ontelaunee Power Operating Company, LLC

Pleasants Corp.

Pleasants Energy, LLC

Pleasants LLC

Public Power & Utility of Maryland, LLC

Public Power & Utility of NY, LLC

Public Power, LLC (a Connecticut limited liability company)

Public Power, LLC (PA-3911142, a Pennsylvania limited liability company)

Public Power, LLC (PA-3933152, a Pennsylvania limited liability company)

Regional Energy Holdings, LLC

Sandow Power Company LLC

Sayreville Power Generation LP

Sayreville Power GP Inc.

Sayreville Power Holdings LLC

Sithe Energies, Inc.

Sithe/Independence LLC

Southwestern Electric Service Company, Inc.

Texas Electric Service Company, Inc.

Texas Energy Industries Company, Inc.

Texas Power & Light Company, Inc.

Texas Utilities Company, Inc.

Texas Utilities Electric Company, Inc

TriEagle 1, LLC

TriEagle 2, LLC

TriEagle Energy LP

Trinidad Power Storage LLC

TXU Electric Company, Inc.

TXU Energy Retail Company LLC

U.S. Gas & Electric, LLC

USG&E Solar, LLC

Value Based Brands LLC

Veazie Energy Storage LLC

Verengo, LLC

Viridian Energy NY, LLC

Viridian Energy Ohio LLC

Viridian Energy PA LLC

Viridian Energy, LLC

Viridian International Management LLC

Viridian Network, LLC

Vision Trading Company LLC

[Signature Page to Twenty-Fourth Supplemental Indenture]

Vistra Asset Company LLC

Vistra Corporate Services Company

Vistra EP Properties Company

Vistra Finance Corp.

Vistra Insurance Solutions LLC

Vistra Nuclear Operations Company (f/k/a Energy Harbor Nuclear Corp.)

Vistra Preferred, LLC

Vistra Retail Operations Company, LLC (f/k/a TXU Retail Services Company, LLC)

Vistra Vision Holdings I LLC

Vistra Vision Holdings II LLC

Vistra Vision LLC

Vistra Vision Management LLC

Vistra Zero 2.0, LLC

Vistra Zero LLC

Volt Asset Company, LLC

VZ Development LLC

Washington Power Generation LLC

Wise County Power Company, LLC

Wise-Fuels Pipeline, Inc.

Zimmer Power Company LLC,

as Subsidiary Guarantors

By: /s/ William M. Quinn

Name: William M. Quinn

Title: Senior Vice President and Treasurer

[Signature Page to Twenty-Fourth Supplemental Indenture]

WILMINGTON TRUST, NATIONAL ASSOCIATION,
as the Trustee

By: /s/ Latoya S. Elvin

Name: Latoya S. Elvin

Title: Vice President

[Signature Page to Twenty-Fourth Supplemental Indenture]

SCHEDULE I

GUARANTEEING SUBSIDIARIES


#	Name	Jurisdiction
1.	Beaver Falls Energy Storage, LLC	Delaware
2.	Beaver Falls, L.L.C.	Delaware
3.	Carneys Point Energy Storage, L.L.C.	Delaware
4.	Edgewater Generation Holdings, L.L.C.	Delaware
5.	Edgewater Generation, L.L.C.	Delaware
6.	Fairless Energy, L.L.C.	Delaware
7.	Garrison Energy Center LLC	Delaware
8.	Geranium Energy Storage I, L.L.C.	Delaware
9.	Geranium Energy Storage II, L.L.C.	Delaware
10.	Greenleaf Energy Unit 2 LLC	Delaware
11.	Hazleton Generation LLC	Delaware
12.	Hazleton Holdco, L.L.C	Delaware
13.	Logan Energy Storage, L.L.C.	Delaware
14.	Manchester Street, L.L.C.	Delaware
15.	NatGas California, L.L.C.	Delaware
16.	NatGas Greenleaf Holdings, L.L.C.	Delaware
17.	SBF New York, L.L.C.	Delaware
18.	SBFH Holdco, L.L.C.	Delaware
19.	Syracuse Energy Storage, LLC	Delaware
20.	Syracuse, L.L.C.	Delaware
21.	Verbena Energy Storage, L.L.C.	Delaware