EX-4.1





 Exhibit 4.1 

THIRD SUPPLEMENTAL INDENTURE 

SUBSIDIARY GUARANTEES 

THIRD SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of October 25, 2019, among the subsidiary
guarantors listed on Schedule I 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”). 

WITNESSETH 
 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 and (ii) that certain Supplemental Indenture, 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 $800,000,000 of
4.30% Senior Secured Notes due 2029 (collectively, the “Notes”) (the “First Supplement” and, together with the Base Indenture, 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 (the “Subsidiary Guarantees”); and 

WHEREAS, pursuant to Section 9.01 of the Base Indenture and Sections 4.07 and 9.01 of the First 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 or First Supplement, as applicable. 

2.    Agreement to be Bound; Guarantee. Each of the Guaranteeing Subsidiaries hereby becomes a party to the
Indenture as a Subsidiary Guarantor and as such will have all of the rights and be subject to all of the Obligations and agreements of a Subsidiary Guarantor under the Indenture. Each of the Guaranteeing Subsidiaries hereby agrees to be bound by all
of the provisions of the Indenture applicable to a Subsidiary Guarantor and to perform all of the Obligations and agreements of a Subsidiary Guarantor under the Indenture. In furtherance of the foregoing, each of the Guaranteeing Subsidiaries shall
be deemed a Subsidiary Guarantor for purposes of Article 10 of the First Supplement, including, without limitation, Section 10.02 thereof. 

  
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 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 pages follow] 

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

					
	 BRIGHTSIDE SOLAR, LLC

EMERALD GROVE SOLAR, LLC
 HALLMARK SOLAR, LLC,

 as the Guaranteeing Subsidiaries

		
	        By:	 	 /s/ Kristopher E. Moldovan

		 	Name:	 	Kristopher E. Moldovan
		 	Title:	 	Senior Vice President and Treasurer



  
 [Signature Page to Third
Supplemental Indenture] 














					
	 VISTRA OPERATIONS COMPANY LLC,

as the Company

		
	By:	 	 /s/ Kristopher E. Moldovan

		 	Name:	 	Kristopher E. Moldovan
		 	Title:	 	Senior Vice President and Treasurer


  
 [Signature Page to Third
Supplemental Indenture] 














			
	 ANP BELLINGHAM ENERGY COMPANY, LLC
	  	 ILLINOIS POWER RESOURCES, LLC

	 ANP BLACKSTONE ENERGY COMPANY, LLC
	  	 ILLINOVA CORPORATION

	 BIG BROWN POWER COMPANY LLC
	  	 IPH, LLC

	 CALUMET ENERGY TEAM, LLC
	  	 KINCAID GENERATION, L.L.C.

	 CASCO BAY ENERGY COMPANY, LLC
	  	 LA FRONTERA HOLDINGS, LLC

	 COFFEEN AND WESTERN RAILROAD COMPANY
	  	 LAKE ROAD GENERATING COMPANY, LLC

	 COLETO CREEK POWER, LLC
	  	 LIBERTY ELECTRIC POWER, LLC

	 COMANCHE PEAK POWER COMPANY LLC
	  	 LONE STAR ENERGY COMPANY, INC.

	 CORE SOLAR SPV I, LLC
	  	 LONE STAR PIPELINE COMPANY, INC.

	 DALLAS POWER & LIGHT COMPANY, INC.
	  	 LUMINANT ENERGY COMPANY LLC

	 DYNEGY ADMINISTRATIVE SERVICES COMPANY
	  	 LUMINANT ENERGY TRADING CALIFORNIA COMPANY

	 DYNEGY ASSOCIATES NORTHEAST LP, INC.
	  	 LUMINANT ET SERVICES COMPANY LLC

	 DYNEGY COAL GENERATION, LLC
	  	 LUMINANT GENERATION COMPANY LLC

	 DYNEGY COAL HOLDCO, LLC
	  	 LUMINANT MINING COMPANY LLC

	 DYNEGY COAL TRADING & TRANSPORTATION, L.L.C.
	  	 MASSPOWER, LLC

	 DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC
	  	 MIDLOTHIAN ENERGY, LLC

	 DYNEGY CONESVILLE, LLC
	  	 MILFORD POWER COMPANY, LLC

	 DYNEGY DICKS CREEK, LLC
	  	 MOSS LANDING ENERGY STORAGE 1, LLC

	 DYNEGY ENERGY SERVICES (EAST), LLC
	  	 NCA RESOURCES DEVELOPMENT COMPANY LLC

	 DYNEGY ENERGY SERVICES, LLC
	  	 NEPCO SERVICES COMPANY

	 DYNEGY FAYETTE II, LLC
	  	 NORTHEASTERN POWER COMPANY

	 DYNEGY GAS IMPORTS, LLC
	  	 OAK GROVE MANAGEMENT COMPANY LLC

	 DYNEGY HANGING ROCK II, LLC
	  	 ONTELAUNEE POWER OPERATING COMPANY, LLC

	 DYNEGY KENDALL ENERGY, LLC
	  	 PLEASANTS ENERGY, LLC

	 DYNEGY KILLEN, LLC
	  	 RICHLAND-STRYKER GENERATION LLC

	 DYNEGY MARKETING AND TRADE, LLC
	  	 SANDOW POWER COMPANY LLC

	 DYNEGY MIAMI FORT, LLC
	  	 SITHE ENERGIES, INC.

	 DYNEGY MIDWEST GENERATION, LLC
	  	 SITHE/INDEPENDENCE LLC

	 DYNEGY MORRO BAY, LLC
	  	 SOUTHWESTERN ELECTRIC SERVICE COMPANY, INC.

	 DYNEGY MOSS LANDING, LLC
	  	 TEXAS ELECTRIC SERVICE COMPANY, INC.

	 DYNEGY NORTHEAST GENERATION GP, INC.
	  	 TEXAS ENERGY INDUSTRIES COMPANY, INC.

	 DYNEGY OAKLAND, LLC
	  	 TEXAS POWER & LIGHT COMPANY, INC.

	 DYNEGY OPERATING COMPANY
	  	 TEXAS UTILITIES COMPANY, INC.

	 DYNEGY POWER GENERATION INC.
	  	 TEXAS UTILITIES ELECTRIC COMPANY, INC.

	 DYNEGY POWER MARKETING, LLC
	  	 T-FUELS, LLC

	 DYNEGY POWER, LLC
	  	 TXU ELECTRIC COMPANY, INC.

	 DYNEGY RESOURCE II, LLC
	  	 TXU ENERGY RETAIL COMPANY LLC

	 DYNEGY RESOURCES GENERATING HOLDCO, LLC
	  	 TXU RETAIL SERVICES COMPANY

	 DYNEGY SOUTH BAY, LLC
	  	 UPTON COUNTY SOLAR 2, LLC

	 DYNEGY STUART, LLC
	  	 VALUE BASED BRANDS LLC

	 DYNEGY WASHINGTON II, LLC
	  	 VISTRA ASSET COMPANY LLC

	 DYNEGY ZIMMER, LLC
	  	 VISTRA CORPORATE SERVICES COMPANY

	 ENNIS POWER COMPANY, LLC
	  	 VISTRA EP PROPERTIES COMPANY

	 EQUIPOWER RESOURCES CORP.
	  	 VISTRA FINANCE CORP.

	 GENERATION SVC COMPANY
	  	 VISTRA INSURANCE SOLUTIONS LLC

	 HAVANA DOCK ENTERPRISES, LLC
	  	 VISTRA PREFERRED INC.

	 HAYS ENERGY, LLC
	  	 VOLT ASSET COMPANY, INC.

	 HOPEWELL POWER GENERATION, LLC
	  	 VOLT VENTURES LLC

	 ILLINOIS POWER GENERATING COMPANY
	  	 WHARTON COUNTY GENERATION, LLC

	 ILLINOIS POWER MARKETING COMPANY
	  	 WISE COUNTY POWER COMPANY, LLC

	 ILLINOIS POWER RESOURCES GENERATING, LLC
	  	 WISE-FUELS PIPELINE, INC.,

		  	as the Subsidiary Guarantors

  

					
	By:	 	 /s/ Kristopher E. Moldovan

		 	Name:	 	Kristopher E. Moldovan
		 	Title:	 	Senior Vice President and Treasurer



  
 [Signature Page to Third
Supplemental Indenture] 














					
	 WILMINGTON TRUST, NATIONAL ASSOCIATION,

as the Trustee

		
	By:	 	 /s/ Shawn Goffinet

		 	Name:	 	Shawn Goffinet
		 	Title:	 	Assistant Vice President


  
 [Signature Page to Third
Supplemental Indenture] 













 SCHEDULE I 

SUBSIDIARY GUARANTORS 
  

			
	 Name
	  	Jurisdiction
	 Brightside Solar, LLC
	  	Texas
		
	 Emerald Grove Solar, LLC
	  	Delaware
		
	 Hallmark Solar, LLC
	  	Texas


  
 Sch-I-1