Document:

EX-10.1

 Exhibit 10.1 

VISTRA OPERATIONS COMPANY LLC 

$300,000,000 
 3.55% Senior Secured
Notes due 2024 
 $800,000,000 

3.70% Senior Secured Notes due 2027 

Purchase Agreement 

November 6, 2019 
 J.P. Morgan Securities LLC

 As Representative of the Initial Purchasers 
 c/o J.P. Morgan
Securities LLC 
 383 Madison Avenue 
 New York, New York 10179

 Ladies and Gentlemen: 
 Vistra Operations
Company LLC, a limited liability company organized under the laws of the State of Delaware (the “Company”) and wholly owned indirect subsidiary of Vistra Energy Corp. (the “Parent”), proposes to issue and sell to the several
parties named in Schedule I hereto (the “Initial Purchasers”), for whom you (the “Representative”) are acting as representative, $300,000,000 principal amount of its 3.55% Senior Secured Notes due 2024 (the “2024
Notes”), which form a part of the same series as the Company’s outstanding 3.55% Senior Secured Notes due 2024 issued on June 11, 2019, and $800,000,000 principal amount of its 3.70% Senior Secured Notes due 2027 (the “2027
Notes,” and together with the 2024 Notes, the “Securities”). The 2024 Notes are to be issued under the indenture, dated as of June 11, 2019 (the “ Base Indenture”), as supplemented by the supplemental indenture, dated
as of June 11, 2019 (the “First Supplemental Indenture”), the second supplemental indenture dated as of August 30, 2019 (the “Second Supplemental Indenture”), and the third supplemental indenture, dated as of
October 25, 2019 (the Third Supplemental Indenture”), and the 2027 Notes are to be issued under the Base Indenture and a fourth supplemental indenture to be dated as of the Closing Date (as defined below) (the “Fourth Supplemental
Indenture” and, together with the Base Indenture, the First Supplemental Indenture, the Second Supplemental Indenture, and the Third Supplemental Indenture, the “Indenture”), by and among the Company, the Guarantors (as defined below)
and Wilmington Trust, National Association, as trustee (the “Trustee”). The Securities will be fully and unconditionally guaranteed on a senior secured basis (the “Guarantees”) by certain of the Company’s current and future
subsidiaries, including (i) its current and future wholly owned domestic subsidiaries and (ii) Vistra Preferred Inc. and its wholly owned domestic subsidiaries (collectively, the “Guarantors”) that, in each case, from time to
time are guarantors under the Credit Agreement, dated October 3, 2016, among the Company, Vistra Intermediate Company LLC (“Vistra Intermediate”), the Guarantors, various lenders party thereto and Credit Suisse AG, Cayman Islands
Branch, as successor administrative agent and successor collateral agent (as amended, the “Credit Agreement”). The use of the neuter in this purchase agreement (this “Agreement”) shall include the feminine and masculine wherever
appropriate. 

 The Securities and the Guarantees will be secured by a first-priority lien, subject to
Permitted Liens (as defined below), on substantially all of the current and after-acquired assets, rights and properties of the Company and the Guarantors and a pledge of equity interests of the Company by Vistra Intermediate that secure borrowings
under (a) the Credit Agreement, (b) certain first-lien hedging and cash management obligations of the Company, (c) the Company’s outstanding 3.55% Senior Secured Notes due 2024 and (d) the Company’s 4.30% Senior Secured
Notes due 2029 (the indebtedness described in clauses (a) through (d) of this sentence, the “Existing Indebtedness”), subject to exceptions as described in the Collateral Trust Agreement (as defined below) and the Collateral Documents
(as defined below) (the “Collateral”). The Collateral is described in (i) the Amended and Restated Pledge Agreement, dated as of October 3, 2016 (as amended and supplemented as of the date hereof, the “Pledge
Agreement”), among the Company, Vistra Intermediate, the subsidiary pledgors party thereto or that become party thereto, Credit Suisse AG, Cayman Islands Branch, as successor collateral agent under the Credit Agreement, and Delaware Trust
Company, as collateral trustee under the Collateral Trust Agreement (the “Collateral Trustee”), as supplemented by the additional first lien secured party consent (the “First Lien Consent”) to be entered into by the Trustee and
the other parties thereto on the Closing Date, (ii) the Amended and Restated Security Agreement, dated as of October 3, 2016 (as amended and supplemented as of the date hereof, the “Security Agreement”), among the grantors party
thereto, Credit Suisse AG, Cayman Islands Branch, as successor collateral agent under the Credit Agreement, and the Collateral Trustee, as collateral trustee under the Collateral Trust Agreement, as supplemented by the First Lien Consent, and
(iii) any Mortgage (as defined in the Credit Agreement) that has been executed and delivered by the Company or any Guarantor pursuant to the terms of the Credit Agreement. The “Collateral Documents” as used herein means the Pledge
Agreement, the Security Agreement, any Mortgage and all other security agreements, pledge agreements, collateral assignments, mortgages, deeds of trust, control agreements or other grants or transfers for security executed and delivered by the
Company or any Guarantor from time to time to secure the Existing Indebtedness, the Securities and the Guarantees. The rights of holders of the Securities and the Guarantees with respect to the Collateral are further described in the Collateral
Trust Agreement, dated as of October 3, 2016 (as amended and supplemented as of the date hereof, the “Collateral Trust Agreement”), among the Company, the other grantors party thereto, Railroad Commission of Texas as the first-out representative, Credit Suisse AG, Cayman Islands Branch as successor senior credit agreement representative, and the Collateral Trustee, as amended and supplemented by a Collateral Trust Joinder –
Additional Debt (the “Joinder”), to be executed by the Trustee and acknowledged by the Collateral Trustee on the Closing Date, and an Additional Secured Debt Designation, (the “Designation”), to be executed by the Company and
acknowledged by the Collateral Trustee on the Closing Date. 
 The sale of the Securities to the Initial Purchasers will be made without
registration of the Securities under the Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder (the “Securities Act”), in reliance upon exemptions from the registration requirements of the Securities Act.

  
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 In connection with the sale of the Securities, the Company has prepared a preliminary
offering memorandum, dated November 6, 2019 (as amended or supplemented at the date thereof, including any and all exhibits thereto and any information incorporated by reference therein, the “Preliminary Memorandum”), and a final
offering memorandum, dated November 6, 2019 (as amended or supplemented at the Execution Time (as defined below), including any and all exhibits thereto and any information incorporated by reference therein, the “Final Memorandum”).
Each of the Preliminary Memorandum and the Final Memorandum sets forth certain information concerning the Company and the Securities. The Company hereby confirms that it has authorized the use of the Disclosure Package (as defined below), the
Preliminary Memorandum and the Final Memorandum, and any amendment or supplement thereto, in connection with the offer and sale of the Securities by the Initial Purchasers. Unless stated to the contrary, any references herein to the terms
“amend”, “amendment” or “supplement” with respect to the Disclosure Package, the Preliminary Memorandum and the Final Memorandum shall be deemed to refer to and include any information filed under the Exchange Act (as
defined below) subsequent to the Execution Time that is incorporated by reference therein. 
 As used in this Agreement, the
“Disclosure Package” shall mean (i) the Preliminary Memorandum, as amended or supplemented at the date and time that this Agreement is executed and delivered by the parties hereto (the “Execution Time”), (ii) the final term
sheet prepared pursuant to Section 5(b) hereto and in the form attached as Schedule II hereto and (iii) any writings in addition to the Preliminary Memorandum that the parties expressly agree in writing to treat as part of the Disclosure
Package (“Issuer Written Information”). 
 The net proceeds from the offering of the Securities will be used, together with
certain cash on hand of the Company, to pay down amounts borrowed under the Company’s senior secured Term Loan B Facility under the Credit Agreement and to pay fees and expenses related to this offering. Any remaining net proceeds following
such uses will be used for general corporate purposes. 
 1. Representations and Warranties. Each of the Company and each of the
Guarantors, jointly and severally, represents and warrants to, and agrees with, each Initial Purchaser as set forth below in this Section 1. 

(a) The Preliminary Memorandum, at the date thereof, did not contain any untrue statement of a material fact or omit to state any material fact
necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading. At the Execution Time and on the Closing Date, the Final Memorandum did not and will not (and any amendment or supplement
thereto, at the date thereof and at the Closing Date will not) contain any untrue statement of a material fact or omit to state any material fact necessary to make the statements therein, in the light of the circumstances under which they were made,
not misleading; provided, however, that the Company makes no representation or warranty as to the information contained in or omitted from the Preliminary Memorandum or the Final Memorandum, or any amendment or supplement thereto, in
reliance upon and in conformity with information furnished in writing to the Company by or on behalf of the Initial Purchasers through the Representative specifically for inclusion therein, it being understood and agreed that the only such
information furnished by or on behalf of any Initial Purchaser consists of the information described as such in Section 8(b) hereof. 

  
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 (b) As of the Execution Time, neither (i) (1) the Disclosure Package and (2) each
electronic road show, when taken together as a whole with the Disclosure Package, nor (ii) any other General Solicitation (as defined below) by the Company, its Affiliates, or any person acting on its or their behalf, contains any untrue
statement of a material fact or omits to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. The preceding sentence does not apply to statements in
or omissions from the Disclosure Package based upon and in conformity with written information furnished to the Company by any Initial Purchaser through the Representative specifically for use therein, it being understood and agreed that the only
such information furnished by or on behalf of any Initial Purchaser consists of the information described as such in Section 8(b) hereof. The term “Affiliates,” means affiliates, as such term is defined in Rule 501(b) of Regulation D
under the Securities Act (“Regulation D”), except that in reference to the Company, it excludes any person or entity that is an affiliate (as defined in Rule 501(b)) primarily or exclusively as a result of his, her or its ownership of
capital stock of the Parent. 
 (c) None of the Company, its Affiliates, or any person acting on its or their behalf has, directly or
indirectly, made offers or sales of any security, or solicited offers to buy, any security under circumstances that would require the registration of the Securities under the Securities Act. 

(d) None of the Company, its Affiliates, or any person acting on its or their behalf has: (i) engaged in any form of general solicitation
or general advertising (within the meaning of Regulation D) (each, a “General Solicitation”) in connection with any offer or sale of the Securities, other than any General Solicitation in respect of which the Representative has given
its prior written consent; provided that the prior written consent of the Representative shall be deemed to have been given in respect of the General Solicitation included in Schedule III hereto or (ii) engaged in any directed selling
efforts (within the meaning of Regulation S under the Securities Act (“Regulation S”)) with respect to the Securities; and each of the Company, its Affiliates and each person acting on its or their behalf has complied with the
offering restrictions requirement of Regulation S. 
 (e) The Securities satisfy the eligibility requirements of Rule 144A(d)(3) under
the Securities Act. 
 (f) The Parent is subject to and in full compliance with the reporting requirements of Section 13 or
Section 15(d) of the Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder (the “Exchange Act”). 

(g) No registration under the Securities Act of the Securities, and no qualification of the Indenture under the Trust Indenture Act of 1939, as
amended, is required for the offer and sale of the Securities to or by the Initial Purchasers in the manner contemplated herein, in the Disclosure Package and in the Final Memorandum. 

(h) Neither the Company nor any of the Guarantors is or, after giving effect to the offering and sale of the Securities and the application of
the proceeds thereof as described in the Disclosure Package and the Final Memorandum, will be an “investment company” as defined in the Investment Company Act of 1940, as amended, and the rules and regulations promulgated thereunder. 

  
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 (i) Neither the Company nor any of the Guarantors (or any other person acting on its or
their behalf) has paid or agreed to pay to any person any compensation for soliciting another to purchase any securities of the Company (except as contemplated in this Agreement). 

(j) Neither the Company nor any of the Guarantors (or any other person acting on its or their behalf) has taken, directly or indirectly, any
action designed to or that has constituted or that might reasonably be expected to cause or result, under the Exchange Act or otherwise, in stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of
the Securities. 
 (k) Each of the Company and each Guarantor has been duly incorporated or formed, as applicable, and is validly existing as
a corporation or limited liability company in good standing under the laws of the jurisdiction in which it is incorporated, chartered, organized or formed with full corporate or limited liability company, as applicable, power and authority
necessary to own or lease, as the case may be, and to operate its properties and conduct its business as described in the Disclosure Package and the Final Memorandum, and is duly qualified to do business as a foreign corporation or limited liability
company, as applicable, and is in good standing under the laws of each jurisdiction that requires such qualification. 
 (l) The Company has
the authorized capitalization set forth in the Disclosure Package and the Final Memorandum. 
 (m) All the outstanding shares of capital
stock or ownership interests of the Company and each of its subsidiaries have been duly authorized and validly issued and are fully paid and nonassessable, and, except (i) as otherwise set forth in the Disclosure Package and the Final
Memorandum and (ii) for Vistra Preferred Inc. and its subsidiaries, all outstanding shares of capital stock or ownership interests of the subsidiaries are owned by the Company either directly or through wholly owned subsidiaries free and clear
of any security interest, claim, lien or encumbrance, other than any encumbrances created by the Collateral Documents and other Permitted Liens. 

(n) The statements in the Preliminary Memorandum and the Final Memorandum under the headings “Certain U.S. Federal Income Tax
Considerations”, “Certain ERISA Considerations”, “Description of the Notes” and “Description of Other Indebtedness” fairly summarize the matters therein described. 

(o) This Agreement has been duly authorized, executed and delivered by each of the Company and each Guarantor; each of the Base Indenture, the
First Supplemental Indenture, the Second Supplemental Indenture, and the Third Supplemental Indenture has been duly authorized, executed and delivered by the Company and the Guarantors and, assuming due authorization, execution and delivery thereof
by the Trustee, constitutes a legal, valid, binding instrument enforceable against the Company and each Guarantor in accordance with its terms (subject, as to the enforcement of remedies, to applicable bankruptcy, reorganization, insolvency,
moratorium or other laws affecting creditors’ rights generally from time to time in effect and to 

  
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general principles of equity); the Fourth Supplemental Indenture has been duly authorized by each of the Company and each Guarantor and, assuming due authorization, execution and delivery thereof
by the Trustee, when executed and delivered by each of the Company and each Guarantor, will constitute a legal, valid, binding instrument enforceable against the Company and each Guarantor in accordance with its terms (subject, as to the enforcement
of remedies, to applicable bankruptcy, reorganization, insolvency, moratorium or other laws affecting creditors’ rights generally from time to time in effect and to general principles of equity); and the Securities have been duly authorized,
and, when executed and authenticated in accordance with the provisions of the Indenture and delivered to and paid for by the Initial Purchasers, will have been duly executed and delivered by the Company and will constitute the legal, valid and
binding obligations of the Company entitled to the benefits of the Indenture (subject, as to the enforcement of remedies, to applicable bankruptcy, reorganization, insolvency, moratorium or other laws affecting creditors’ rights generally from
time to time in effect and to general principles of equity). 
 (p) The Guarantees have been duly authorized, and, when the Securities have
been executed and delivered by the Company in accordance with the provisions of the Indenture, will constitute the legal, valid and binding obligations of the Guarantors entitled to the benefits of the Indenture (subject, as to the enforcement of
remedies, to applicable bankruptcy, reorganization, insolvency, moratorium or other laws affecting creditors’ rights generally from time to time in effect and to general principles of equity). 

(q) When the Securities are delivered and paid for, all filings, including any UCC-1 financing
statements and similar documents executed or entered into prior to the date hereof (collectively, the “Security Documents”), and other actions necessary or desirable to perfect a first-priority security interest (subject to no liens except
with respect to liens permitted under the Collateral Documents (“Permitted Liens”)) in the Collateral will, subject to Section 5(s) below, have been duly made or taken in each place in which such filing or action is required to
create, protect, preserve and perfect the security interest created by the Collateral Documents and the Security Documents and will be in full force and effect, and, subject to Section 5(s) below, all taxes and recording and filing fees
required to be paid with respect to the execution, recording or filing of the Indenture, the Collateral Documents and the Security Documents and the issuance of the Securities will have been paid; and when the Securities are delivered and paid for,
and all other such actions taken, the Collateral Trustee will have a valid and perfected first-priority security interest (subject to no liens except Permitted Liens) in the Collateral with respect to the
Securities and Guarantees. 
 (r) Each of the Collateral Documents, the Collateral Trust Agreement, the Joinder, the Designation and the
First Lien Consent has been duly authorized, by the Company, each Guarantor and Vistra Intermediate (to the extent such person is party thereto); each of the Collateral Documents and the Collateral Trust Agreement has been duly, executed and
delivered by the Company, each Guarantor and Vistra Intermediate (to the extent such person is party thereto), and constitutes a valid and binding agreement of the Company, such Guarantor and Vistra Intermediate (to the extent such person is party
thereto), enforceable against the Company, such Guarantor and Vistra Intermediate (to the extent such person is party thereto), in accordance with its terms (subject, as to the enforcement of remedies, to applicable bankruptcy, reorganization,
insolvency, moratorium or other laws affecting creditors’ rights generally from 

  
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time to time in effect and to general principles of equity); and on the Closing Date, each of the Joinder, the Designation and the First Lien Consent will have been duly executed and delivered by
the Company, each Guarantor and Vistra Intermediate (to the extent such person is party thereto), and, when duly executed and delivered in accordance with its terms by each of the other parties thereto, will constitute a valid and binding agreement
of the Company, each Guarantor and Vistra Intermediate (to the extent such person is party thereto), enforceable against the Company, such Guarantor and Vistra Intermediate, as applicable, in accordance with its terms (subject, as to the enforcement
of remedies, to applicable bankruptcy, reorganization, insolvency, moratorium or other laws affecting creditors’ rights generally from time to time in effect and to general principles of equity). 

(s) When the Securities are delivered and paid for pursuant to this Agreement on the Closing Date: (i) subject to Section 5(s) below,
the Collateral Documents will continue to be effective to grant a legal, valid and enforceable security interest in all of the grantors’ right, title and interest in the Collateral (except as such enforcement may be limited by applicable
bankruptcy, reorganization, insolvency, moratorium or other laws affecting creditors’ rights generally from time to time in effect); and (ii) upon due and timely filing and/or recording of any amendment of or supplement to the Security
Documents with respect to the Collateral described in the Collateral Documents, the security interests granted under the Collateral Documents will constitute valid, perfected first-priority liens, subject to Permitted Liens, and security interests
in the Collateral, to the extent such security interests can be perfected by the filing and/or recording, as applicable, of the Security Documents for the benefit of the Trustee and the holders of the Securities and the Guarantees, and such security
interests will be enforceable in accordance with the terms contained therein (except as such enforcement may be limited by applicable bankruptcy, reorganization, insolvency, moratorium or other laws affecting creditors’ rights generally from
time to time in effect) against all creditors of any grantor subject to Permitted Liens. The Company, the Guarantors and Vistra Intermediate collectively own, have rights in or have the power and authority to assign rights in the Collateral, free
and clear of any liens other than Permitted Liens. 
 (t) No consent, approval, authorization, filing with or order of any court or
governmental agency or body is required in connection with the transactions contemplated in this Agreement, the Indenture, the Collateral Documents, the Collateral Trust Agreement, the Joinder, the Designation or the First Lien Consent, except such
as may be required under the blue sky laws of any jurisdiction in which the Securities are offered and sold or except as may be necessary to perfect security interests. 

(u) None of the execution and delivery of this Agreement, the Fourth Supplemental Indenture, the Designation or the First Lien Consent, the
issuance and sale of the Securities and the Guarantees, the performance by the Company, any Guarantor or Vistra Intermediate, as applicable, of their respective obligations under this Agreement, the Collateral Trust Agreement, the Collateral
Documents, the Designation or the First Lien Consent or the consummation of any other of the transactions herein or therein contemplated, or the fulfillment of the terms hereof or thereof conflicted or will conflict with, as applicable, resulted or
will result in, as applicable, a breach or violation of, or imposition of any lien, charge or encumbrance upon any property or assets of Vistra Intermediate, the Company or any of its subsidiaries pursuant to, (i) the charter or by-laws or comparable constituting documents of Vistra Intermediate, the 

  
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Company or any of its subsidiaries; (ii) the terms of any indenture, contract, lease, mortgage, deed of trust, note agreement, loan agreement or other agreement, obligation, condition,
covenant or instrument to which Vistra Intermediate, the Company or any of its subsidiaries is a party or bound or to which its or their property is subject; or (iii) any statute, law, rule, regulation, judgment, order or decree of any court,
regulatory body, administrative agency, governmental body, arbitrator or other authority having jurisdiction over Vistra Intermediate, the Company or any of its subsidiaries or any of its or their properties, which conflict, breach, violation or
imposition would, in the case of clauses (ii) and (iii) above, either individually or in the aggregate with all other conflicts, breaches, violations and impositions referred to in this paragraph (r) (if any), have (x) a Material Adverse
Effect (as defined below) or (y) a material adverse effect upon the transactions contemplated herein. 
 (v) The consolidated historical
financial statements and schedules of the Parent and Dynegy Inc. (“Dynegy”) and their consolidated subsidiaries included or incorporated by reference in the Disclosure Package and the Final Memorandum present fairly the financial
condition, results of operations and cash flows of the Parent and Dynegy, as applicable, as of the dates and for the periods indicated, comply as to form with the applicable accounting requirements of Regulation
S-X (as defined below) and have been prepared in conformity with generally accepted accounting principles in the United States applied on a consistent basis throughout the periods involved
(except as otherwise noted therein); the selected financial data set forth under the caption “Summary Historical Consolidated Financial Information” in the Preliminary Memorandum and the Final Memorandum fairly present, on the basis stated
in the Preliminary Memorandum and the Final Memorandum, the information included or incorporated by reference therein; the pro forma financial statements included or incorporated by reference in the Disclosure Package and the Final
Memorandum include assumptions that provide a reasonable basis for presenting the significant effects directly attributable to the transactions and events described therein, the related pro forma adjustments give appropriate effect to those
assumptions, the pro forma adjustments reflect the proper application of those adjustments to the historical financial statement amounts in the pro forma financial statements included or incorporated by reference in the Disclosure Package and
the Final Memorandum; the pro forma financial statements included or incorporated by reference in the Disclosure Package and the Final Memorandum comply as to form with the applicable accounting requirements of Regulation S-X; and the pro forma adjustments have been properly applied to the historical amounts in the compilation of those statements. 

(w) No action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company or
any of its subsidiaries or its or their property is pending or, to the best knowledge of the Company, threatened that (i) could reasonably be expected to have a material adverse effect on the performance by the Company, any of the Guarantors or
Vistra Intermediate, as applicable, of this Agreement, the Indenture, the Collateral Trust Agreement, the Collateral Documents, the Designation or the First Lien Consent or the consummation of any of the transactions contemplated hereby or
thereby or (ii) could reasonably be expected to have a material adverse effect on the condition (financial or otherwise), prospects, business or properties of the Company and its subsidiaries, taken as a whole, whether or not arising
from transactions in the ordinary course of business (clauses (i) and (ii), a “Material Adverse Effect”), except as set forth in or contemplated in the Disclosure Package and the Final Memorandum (exclusive of any amendment or
supplement thereto). 

  
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 (x) (i) Each of the Company and its subsidiaries has good and marketable title to all
the properties (real and personal) described in the Disclosure Package and the Final Memorandum as being owned by any of them, in each case, free and clear of any liens, equities, claims and other defects (except as may exist under applicable law
and as may be imposed by the Company’s credit facilities described in the Disclosure Package and the Final Memorandum, those securing the obligation under the Securities and Guarantees, Permitted Liens or as do not materially affect the value
of such property and do not materially interfere with the use made and proposed to be made of such property by the Company and its subsidiaries); and (ii) all the property described in the Disclosure Package and the Final Memorandum as being
held under lease by the Company or its subsidiaries is held thereby under valid, subsisting and enforceable leases, except, in the case of clause (i) or (ii), as would not, individually or in the aggregate, have a Material Adverse Effect. 

(y) Neither the Company nor any of its subsidiaries is in violation or default of (i) any provision of its charter or bylaws or comparable
constituting documents; (ii) the terms of any indenture, contract, lease, mortgage, deed of trust, note agreement, loan agreement or other agreement, obligation, condition, covenant or instrument to which it is a party or bound or to which its
property is subject; or (iii) any statute, law, rule, regulation, judgment, order or decree applicable to the Company or any of its subsidiaries of any court, regulatory body, administrative agency, governmental body, arbitrator or other
authority having jurisdiction over the Company or such subsidiary or any of its properties, as applicable, except, in the case of clauses (ii) and (iii), as would not, individually or in the aggregate, have a Material Adverse Effect. 

(z) Deloitte & Touche LLP, which has certified certain financial statements of the Parent and its consolidated subsidiaries, and
Ernst & Young LLP, which has certified certain financial statements of Dynegy and its consolidated subsidiaries, and which have each delivered its report with respect to the applicable audited consolidated financial statements and schedules
included or incorporated by reference in the Disclosure Package and the Final Memorandum, are independent public accountants with respect to the Parent and to Dynegy, respectively, in accordance with local accounting rules and within
the meaning of the Securities Act. 
 (aa) There are no stamp or other issuance or transfer taxes or duties or other similar fees or charges
required to be paid in connection with the execution and delivery of this Agreement or the issuance or sale of the Securities. 
 (bb) The
Company and each of its subsidiaries has filed all applicable tax returns that are required to be filed or has requested extensions thereof (except in any case in which the failure so to file would not have a Material Adverse Effect and except as
set forth in or contemplated in the Disclosure Package and the Final Memorandum (exclusive of any amendment or supplement thereto)) and has paid all taxes required to be paid by it and any other assessment, fine or penalty levied against it, to the
extent that any of the foregoing is due and payable, except for any such assessment, fine or penalty that is currently being contested in good faith or as would not have a Material Adverse Effect and except as set forth in or contemplated in the
Disclosure Package and the Final Memorandum (exclusive of any amendment or supplement thereto). 

  
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 (cc) No labor problem or dispute with the employees of the Company or any of its
subsidiaries exists or, to the knowledge of the Company, is threatened or imminent, and the Company is not aware of any existing or imminent labor disturbance by the employees of any of its or its subsidiaries’ principal suppliers, contractors
or customers, except as would not have a Material Adverse Effect and except as set forth in or contemplated in the Disclosure Package and the Final Memorandum (exclusive of any amendment or supplement thereto). 

(dd) Except pursuant to applicable law or the Credit Agreement, no subsidiary of the Company is currently prohibited, directly or indirectly,
from paying any dividends to the Company, from making any other distribution on such subsidiary’s capital stock, from repaying to the Company any loans or advances to such subsidiary from the Company or from transferring any of such
subsidiary’s property or assets to the Company or any other subsidiary of the Company, except as described in or contemplated in the Disclosure Package or the Final Memorandum (in each case, exclusive of any amendment or supplement thereto).

 (ee) The Company and each of its subsidiaries are insured by insurers of recognized financial responsibility against such losses and risks
and in such amounts as are prudent and customary in the businesses in which they are engaged; all policies of insurance and fidelity or surety bonds insuring the Company or any of its subsidiaries or their respective businesses, assets, employees,
officers and directors are in full force and effect; the Company and its subsidiaries are in compliance in all material respects with the terms of such policies and instruments; there are no claims by the Company or any of its subsidiaries under any
such policy or instrument as to which any insurance company is denying liability or defending under a reservation of rights clause; neither the Company nor any of its subsidiaries has been refused any insurance coverage sought or applied for; and
neither the Company nor any of its subsidiaries has any reason to believe that it will not be able to renew its existing insurance coverage as and when such coverage expires or to obtain similar coverage from similar insurers as may be necessary to
continue its business at a cost that would not have a Material Adverse Effect except as set forth in or contemplated in the Disclosure Package and the Final Memorandum (exclusive of any amendment or supplement thereto). 

(ff) The Company and its subsidiaries possess all licenses, certificates, permits and other authorizations issued by all applicable authorities
necessary to conduct their respective businesses, and neither the Company nor any of its subsidiaries has received any written notice of proceedings relating to the revocation or modification of any such certificate, authorization or permit which,
singly or in the aggregate, if the subject of an unfavorable decision, ruling or finding, would have a Material Adverse Effect, except as set forth in or contemplated in the Disclosure Package and the Final Memorandum (exclusive of any amendment or
supplement thereto). 
 (gg) The Parent has established and maintains a system of internal control over financial reporting (to the extent
required by and as such term is defined in Rule 13a-15(f) under the Exchange Act) that complies with the requirements of the Exchange Act applicable to the Parent and has been designed by the Parent’s
principal executive officer and principal financial officer, or under their supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance
with generally accepted accounting principles as applied in the United States; the Parent’s internal control over financial reporting is effective; and the Parent is not aware of any material weaknesses in its internal control over financial
reporting. 

  
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 (hh) The Parent maintains disclosure controls and procedures (as such term is defined in
Rule 13a-15(e) under the Exchange Act) that comply with the requirements of the Exchange Act; such disclosure controls and procedures have been designed to ensure that material information relating to the
Parent and its subsidiaries is made known to the Parent’s principal executive officer and principal financial officer by others within those entities; and such disclosure controls and procedures are effective. 

(ii) The Company and its subsidiaries (i) are in compliance with any and all applicable laws and regulations relating to the protection of
human health and safety, the environment or hazardous or toxic substances or wastes, pollutants or contaminants (“Environmental Laws”); (ii) have received and are in compliance with all permits, licenses or other approvals required of them
under applicable Environmental Laws to conduct their respective businesses; and (iii) have not received written notice of any actual or potential liability under any Environmental Law, except with respect to (i) through (iii) above where
such non-compliance with Environmental Laws, failure to receive or comply with required permits, licenses or other approvals, or liability would not, individually or in the aggregate, have a Material Adverse
Effect, except as set forth in or contemplated in the Disclosure Package and the Final Memorandum (exclusive of any amendment or supplement thereto). Except as would not, individually or in the aggregate, have a Material Adverse Effect, except as
set forth in the Disclosure Package and the Final Memorandum, neither the Company nor any of its subsidiaries has been named as a “potentially responsible party” under the Comprehensive Environmental Response, Compensation, and Liability
Act of 1980, as amended. 
 (jj) In the ordinary course of its business, the Company periodically reviews the effect of Environmental Laws on
the business, operations and properties of the Company and its subsidiaries, in the course of which it identifies and evaluates associated costs and liabilities (including, without limitation, any capital or operating expenditures required for clean-up, closure of properties or compliance with Environmental Laws, or any environmental permit, license or approval, any related constraints on operating activities and any potential environmental liabilities to
third parties); on the basis of such review, the Company has reasonably concluded that such associated costs and liabilities would not, singly or in the aggregate, have a Material Adverse Effect, except as set forth in or contemplated in the
Disclosure Package and the Final Memorandum (exclusive of any amendment or supplement thereto). 
 (kk) The minimum funding standard under
Section 302 of the Employee Retirement Income Security Act of 1974, as amended, and the regulations and published interpretations thereunder (“ERISA”), has been satisfied by each “pension plan” (as defined in
Section 3(2) of ERISA) that has been established or maintained by the Company and/or one or more of its subsidiaries, and the trust forming part of each such plan which is intended to be qualified under Section 401 of the Internal Revenue
Code of 1986, as amended, and the regulations promulgated thereunder is so qualified; each of the Company and its subsidiaries has fulfilled its obligations, if any, under Section 515 of ERISA; neither the Company nor any of its subsidiaries
maintains or is required to contribute to a “welfare plan” (as defined in Section 3(1) 

  
 -11- 

 
of ERISA) that provides retiree or other post-employment welfare benefits or insurance coverage (other than “continuation coverage” (as defined in Section 602 of ERISA)); each
pension plan and welfare plan established or maintained by the Company and/or one or more of its subsidiaries is in compliance in all material respects with the currently applicable provisions of ERISA; and neither the Company nor any of its
subsidiaries has incurred or could reasonably be expected to incur any withdrawal liability under Section 4201 of ERISA, any liability under Section 4062, 4063, or 4064 of ERISA, or any other liability under Title IV of ERISA. 

(ll) The subsidiaries listed on Annex A attached hereto are the only “significant subsidiaries” of the Company (as defined in Rule 1-02 of Regulation S-X under the Securities Act (“Regulation S-X”)). 

(mm) The Company will not take, directly or indirectly, any action or omit to take any action (such as issuing any press release relating to
the Securities without an appropriate legend) that would result in the loss by the Initial Purchasers of the ability to rely on the stabilization safe harbor provided by (i) article 5 of the Market Abuse Regulation (EU) No 596/2014 and
Commission Delegated Regulation (EU) 2016/1052 or (ii) the UK Financial Conduct Authority under section 137Q of the Financial Services and Markets Act 2000. 

(nn) The operations of the Company and its subsidiaries are and have been conducted at all times in compliance with applicable financial
recordkeeping and reporting requirements and applicable money laundering statutes and the rules and regulations thereunder and any related or similar rules, regulations or guidelines, issued, administered or enforced by any governmental agency
(collectively, the “Money Laundering Laws”) and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company or any of its subsidiaries with respect to the Money
Laundering Laws is pending or, to the knowledge of the Company, threatened. 
 (oo) Neither the Company nor any of its subsidiaries nor, to
the knowledge of the Company, any director, officer, agent, employee or Affiliate of the Company or any of its subsidiaries (i) is, or is controlled or 50% or more owned in the aggregate by or is acting on behalf of, one or more individuals or
entities that are currently the subject of any sanctions administered or enforced by the United States (including any administered or enforced by the Office of Foreign Assets Control of the U.S. Department of the Treasury, the U.S. Department of
State or the Bureau of Industry and Security of the U.S. Department of Commerce), the United Nations Security Council, the European Union, a member state of the European Union, the United Kingdom (including sanctions administered or enforced by Her
Majesty’s Treasury) or other relevant sanctions authority (collectively, “Sanctions” and such persons, “Sanctioned Persons” and each such person, a “Sanctioned Person”), (ii) is located, organized or resident in a
country or territory that is, or whose government is, the subject of Sanctions that broadly prohibit dealings with that country or territory (collectively, “Sanctioned Countries” and each, a “Sanctioned Country”) or
(iii) will, directly or indirectly, use the proceeds of this offering, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other individual or entity in any manner that would result in a
violation of any Sanctions by, or could result in the imposition of Sanctions against, any individual or entity (including any individual or entity participating in the offering, whether as underwriter, advisor, investor or otherwise). 

  
 -12- 

 (pp) Neither the Company nor any of its subsidiaries has engaged in any dealings or
transactions with or for the benefit of a Sanctioned Person, or with or in a Sanctioned Country, in the three years preceding the date hereof, nor does the Company or any of its subsidiaries have any plans to engage in dealings or transactions with
or for the benefit of a Sanctioned Person, or with or in a Sanctioned Country.  
 (qq) There is and has been no failure on the part
of the Parent or any of the Parent’s directors or officers, in their respective capacities as such, to comply with any applicable provision of the Sarbanes-Oxley Act of 2002 and the applicable rules and regulations promulgated in connection
therewith (the “Sarbanes-Oxley Act”), including Section 402 relating to loans and Sections 302 and 906 relating to certifications. 

(rr) Neither the Company nor any of its subsidiaries nor, to the knowledge of the Company, any director, officer, agent, employee, Affiliate or
other person acting on behalf of the Company or any of its subsidiaries is aware of or has taken any action, directly or indirectly, that could result in a violation or a sanction for violation by any such person or entity of the Foreign Corrupt
Practices Act of 1977 or the U.K. Bribery Act 2010, each as may be amended, or similar applicable law of any other relevant jurisdiction, or the applicable rules or regulations thereunder; and the Company and its subsidiaries have instituted and
maintain policies and procedures to ensure compliance therewith. No part of the proceeds of the offering will be used, directly or indirectly, in violation of the Foreign Corrupt Practices Act of 1977 or the U.K. Bribery Act 2010, each as may be
amended, or similar applicable law of any other relevant jurisdiction, or the applicable rules or regulations thereunder. 
 (ss) Except as
disclosed in the Preliminary Memorandum and the Final Memorandum, the Company (i) does not have any material lending or other relationship with any Initial Purchaser or Affiliate of any Initial Purchaser and (ii) does not intend to use any
of the proceeds from the sale of the Securities hereunder to repay any outstanding debt owed to any Affiliate of any Initial Purchaser. 
 Any certificate
signed by any officer of the Company and delivered to the Representative or counsel for the Initial Purchasers as required by this Agreement or the Indenture in connection with the offering of the Securities contemplated hereby shall be deemed a
representation and warranty by the Company, as to matters covered thereby, to each Initial Purchaser. 
 2. Purchase and Sale. Subject
to the terms and conditions and in reliance upon the representations and warranties herein set forth, the Company agrees to sell to each Initial Purchaser, and each Initial Purchaser agrees, severally and not jointly, to purchase from the Company,
at a purchase price equal to the sum of (a) 100.932% of the principal amount of the 2024 Notes set forth opposite such Initial Purchaser’s name in Schedule I hereto, plus accrued interest on such 2024 Notes from June 11, 2019 to,
but excluding, the Closing Date, and (b) 98.939% of the principal amount of the 2027 Notes set forth opposite such Initial Purchaser’s name in Schedule I hereto, plus accrued interest on such 2027 Notes, if any, from November 15,
2019 to, but excluding, the Closing Date. 

  
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 3. Delivery and Payment. Delivery of and payment for the Securities shall be made at
9:30 A.M., New York City time, on November 15, 2019, or at such time on such later date not more than ten Business Days after the foregoing date as the Representative shall designate, which date and time may be postponed by agreement between
the Representative and the Company or as provided in Section 9 hereof (such date and time of delivery and payment for the Securities being herein called the “Closing Date”). As used herein, “Business Day” shall mean any day
other than a Saturday, a Sunday or a legal holiday or a day on which banking institutions or trust companies are authorized or obligated by law to close in The City of New York. Delivery of the Securities shall be made to the Representative for the
respective accounts of the several Initial Purchasers against payment by the several Initial Purchasers through the Representative of the purchase price thereof to or upon the order of the Company by wire transfer payable in same-day funds to the account specified by the Company. Delivery of the Securities shall be made through the facilities of The Depository Trust Company unless the Representative shall otherwise instruct. 

4. Offering by Initial Purchasers. (a) Each Initial Purchaser acknowledges that the Securities have not been and will not be
registered under the Securities Act and may not be offered or sold within the United States or to, or for the account or benefit of, U.S. persons, except pursuant to an exemption from, or in a transaction not subject to, the registration
requirements of the Securities Act. 
 (b) Solely in connection with the offering of the Securities, each Initial Purchaser, severally and
not jointly, represents and warrants to and agrees with the Company that: 
 (i) it has not offered or sold, and will not
offer or sell, any Securities within the United States or to, or for the account or benefit of, U.S. persons (x) as part of their distribution at any time or (y) otherwise until 40 days after the later of the commencement of the offering
and the date of the closing of the offering except: 
  

	 	(A)	 in the case of sales to those it reasonably believes to be “qualified institutional buyers” as
permitted by Rule 144A under the Securities Act; or 

  

	 	(B)	 in accordance with Rule 903 of Regulation S; 

(ii) neither it nor any person acting on its behalf has made or will make offers or sales of the Securities in the United
States by means of General Solicitation, other than any General Solicitation included in Schedule III hereto; 
 (iii) in
connection with each sale pursuant to Section 4(b)(i)(A), it has taken or will take reasonable steps to ensure that the purchaser of such Securities is aware that such sale may be made in reliance on Rule 144A; 

(iv) neither it, nor any of its Affiliates nor any person acting on its or their behalf has engaged or will engage in any
directed selling efforts (within the meaning of Regulation S) with respect to the Securities; 
 (v) it is an
“accredited investor” (as defined in Rule 501(a) of Regulation D); 

  
 -14- 

 (vi) it has complied and will comply with the offering restrictions
requirement of Regulation S; 
 (vii) at or prior to the confirmation of sale of Securities (other than a sale of
Securities pursuant to Section 4(b)(i)(A) of this Agreement), it shall have sent to each distributor, dealer or person receiving a selling concession, fee or other remuneration that purchases Securities from it during the distribution
compliance period (within the meaning of Regulation S) a confirmation or notice to substantially the following effect: 
 “The
Securities covered hereby have not been registered under the Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder (the “Securities Act”) and may not be offered or sold within the United States or to, or
for the account or benefit of, U.S. persons (i) as part of their distribution at any time or (ii) otherwise until 40 days after the later of the commencement of the offering and the date of closing of the offering, except in either case in
accordance with Regulation S or Rule 144A under the Securities Act. Additional restrictions on the offer and sale of the Securities are described in the offering memorandum for the Securities. Terms used in this paragraph have the meanings given to
them by Regulation S.”; 
 (viii) it has only communicated or caused to be communicated and will only communicate or
cause to be communicated any invitation or inducement to engage in investment activity (within the meaning of Section 21 of the Financial Services and Markets Act 2000 (the “FSMA”)) received by it in connection with the issue or sale
of any Securities, in circumstances in which Section 21(1) of the FSMA does not apply to the Company; 
 (ix) it has
complied and will comply with all applicable provisions of the FSMA with respect to anything done by it in relation to the Securities in, from or otherwise involving the United Kingdom; 

(x) it acknowledges that additional restrictions on the offer and sale of the Securities are described in the Disclosure
Package and the Final Memorandum; and 
 (xi) in relation to each Member State of the European Economic Area, it has not
offered, sold or otherwise made available and will not offer, sell or otherwise make available, any Securities to any retail investor in the European Economic Area. For the purposes of this provision the expression “retail investor” means
a person who is one (or more) of the following: 
  

	 	(A)	 a retail client as defined in point (11) of Article 4(1) of Directive 2014/5/EU (as amended, “MiFID
II”); or 

  

	 	(B)	 a customer within the meaning of Directive 2002/92/EC (as amended, the “Insurance Mediation
Directive”), where that customer would not qualify as a professional client as defined in point (10) of Article 4(1) of MiFID II; or 

  
 -15- 

	 	(C)	 not a qualified investor as defined in Directive 2003/71/EC (as amended, the “Prospectus Directive”);
and 

 the expression “offer” includes the communication in any form and by any means of sufficient information
on the terms of the offer and the notes to be offered so as to enable an investor to decide to purchase or subscribe for the Securities. 

5. Agreements. The Company and each of the Guarantors, jointly and severally, agree with each Initial Purchaser that: 

(a) The Company will furnish to each Initial Purchaser and to counsel for the Initial Purchasers, without charge, during the period referred to
in Section 5(c) below, as many copies of the materials contained in the Disclosure Package and the Final Memorandum and any amendments and supplements thereto as the Initial Purchasers may reasonably request. 

(b) The Company will prepare a final term sheet, containing solely a description of final terms of the Securities and the offering thereof, in
the form approved by you and attached as Schedule II hereto. 
 (c) The Company will not amend or supplement the Disclosure Package or the
Final Memorandum other than by the Parent filing documents under the Exchange Act that are incorporated by reference therein without the prior written consent of the Representative (such consent not to be unreasonably withheld, conditioned or
delayed); provided, however, that prior to the completion of the distribution of the Securities by the Initial Purchasers (as defined by the opinion of counsel (including internal counsel) to the Initial Purchasers), the Company shall
ensure that no document be filed under the Exchange Act that is incorporated by reference in the Disclosure Package or the Final Memorandum unless, prior to such proposed filing, the Company has provided the Representative with a copy of such
document for their review and the Representative has not reasonably objected to the filing of such document. The Company will promptly advise the Representative when any document filed under the Exchange Act that is incorporated by reference in the
Disclosure Package of the Final Memorandum shall have been filed with the Securities and Exchange Commission (the “Commission”). 

(d) If at any time prior to the completion of the sale of the Securities by the Initial Purchasers, any event occurs as a result of which the
Disclosure Package or the Final Memorandum, as then amended or supplemented, would include any untrue statement of a material fact or omit to state any material fact necessary to make the statements therein, in the light of the circumstances under
which they were made or the circumstances then prevailing, not misleading, or if it should be necessary to amend or supplement the Disclosure Package or the Final Memorandum to comply with applicable law, the Company will promptly (i) notify
the Representative of any such event; (ii) subject to the requirements of Section 5(c), prepare an amendment or supplement that will correct such statement or omission or effect such compliance; and (iii) supply any supplemented or
amended Disclosure Package or Final Memorandum to the several Initial Purchasers and counsel for the Initial Purchasers without charge in such quantities as they may reasonably request. 

  
 -16- 

 (e) Without the prior written consent of the Representative, the Company has not given and
will not give to any prospective purchaser of the Securities any written information concerning the offering of the Securities other than materials contained in the Disclosure Package, the Final Memorandum or any other offering materials prepared by
or with the prior written consent of the Representative. 
 (f) The Company will arrange, if necessary, for the qualification of the
Securities for sale by the Initial Purchasers under the laws of such jurisdictions as the Representative may designate (including certain provinces of Canada) and will maintain such qualifications in effect so long as required for the sale of the
Securities; provided that in no event shall the Company be obligated to (i) qualify to do business in any jurisdiction where it is not now so qualified, (ii) subject itself to taxation in any jurisdiction where it is not presently
so subject or (iii) take any action that would subject it to service of process in suits, other than those arising out of the offering or sale of the Securities, in any jurisdiction where it is not now so subject. The Company will promptly
advise the Representative of the receipt by the Company of any notification with respect to the suspension of the qualification of the Securities for sale in any jurisdiction or the initiation or threatening of any proceeding for such purpose. 

(g) The Company will not, and will not permit any of its Affiliates to, resell any Securities that have been acquired by any of them and that
constitute “restricted securities” under Rule 144 under the Securities Act. 
 (h) None of the Company, its Affiliates, or any
person acting on its or their behalf will, directly or indirectly, make offers or sales of any security, or solicit offers to buy any security, under circumstances that, as a result of the doctrine of “integration” referred to in Rule 502
under the Securities Act, would require the registration of the Securities under the Securities Act. 
 (i) None of the Company, its
Affiliates, or any person acting on its or their behalf will engage in any directed selling efforts (within the meaning of Regulation S) with respect to the Securities; and each of them will comply with the offering restrictions requirement of
Regulation S. 
 (j) None of the Company, its Affiliates, or any person acting on its or their behalf will engage in any General Solicitation
with respect to the offer or sale of the Securities, other than any General Solicitation in respect of which the Representative has given its prior written consent; provided that the prior written consent of the Representative shall be deemed
to have been given in respect of the General Solicitation included in Schedule III hereto. 
 (k) For so long as any of the Securities are
outstanding and are “restricted securities” within the meaning of Rule 144(a)(3) under the Securities Act, the Company, during any period in which it is not subject to and in compliance with Section 13 or 15(d) of the Exchange
Act, will provide to each holder of such restricted securities and to each prospective purchaser (as designated by such holder) of such restricted securities, upon the request of such holder or prospective purchaser, any information required to be
provided by Rule 144A(d)(4) under the Securities Act. This covenant is intended to be for the benefit of the holders, and the prospective purchasers designated by such holders, from time to time of such restricted securities. 

  
 -17- 

 (l) The Company will cooperate with the Representative and use its best efforts to permit
the Securities to be eligible for clearance and settlement through The Depository Trust Company. 
 (m) The Company will use the net proceeds
received from the sale of the Securities pursuant to this Agreement in the manner specified in the Disclosure Package and the Final Memorandum. 

(n) Each of the Securities will bear, to the extent applicable, the legend contained in “Notice to Investors” in the Preliminary
Memorandum and the Final Offering Memorandum for the time period and upon the other terms stated therein. 
 (o) The Company will not for a
period of 30 days following the Execution Time, without the prior written consent of J.P. Morgan Securities LLC (“J.P. Morgan”) offer, sell, contract to sell, pledge, otherwise dispose of, or enter into any transaction which is designed
to, or might reasonably be expected to, result in the disposition (whether by actual disposition or effective economic disposition due to cash settlement or otherwise) by the Company or any Affiliate of the Company or any person in privity with the
Company or any Affiliate of the Company, directly or indirectly, or announce the offering, of any debt securities issued or guaranteed by the Company (other than the Securities). 

(p) The Company will not take, directly or indirectly, any action designed to, or that has constituted or that might reasonably be expected to,
cause or result, under the Exchange Act or otherwise, in stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Securities. 

(q) The Company will furnish to the Representative at any time when any Securities remain outstanding, copies of all materials required to be
delivered under the Indenture to holders of such Securities, except to the extent such materials are filed by the Company with the Commission and are publicly available. 

(r) The Company shall ensure that the Parent complies with all applicable securities and other laws, rules and regulations, including, without
limitation, the Sarbanes-Oxley Act, and use its best efforts to cause the Parent’s directors and officers, in their respective capacities as such, to comply with such laws, rules and regulations, including, without limitation, the provisions of
the Sarbanes-Oxley Act. 
 (s) The Company and the Guarantors (i) shall complete, and shall cause Vistra Intermediate to complete, on or
prior to the Closing Date all filings and other similar actions required in connection with the perfection of the security interests in the Collateral as and to the extent contemplated by the Indenture and the Collateral Documents to the extent not
already completed, and (ii) shall take all actions, and shall cause Vistra Intermediate to take all actions, necessary to maintain such security interest and to perfect security interests in any Collateral acquired after the Closing Date, in
each case as and to the extent contemplated by the Indenture and the Collateral Documents and any timeframes or limitations set forth in the Credit Agreement. 

  
 -18- 

 The Company and each of the Guarantors, jointly and severally, agree to pay the costs and
expenses relating to the following matters: (i) the preparation of the Fourth Supplemental Indenture and the issuance of the Securities and the Guarantees and the fees of the Trustee; (ii) the preparation, printing or reproduction of the
materials contained in the Disclosure Package and the Final Memorandum and each amendment or supplement to either of them; (iii) the printing (or reproduction) and delivery (including postage, air freight charges and charges for counting and
packaging) of such copies of the materials contained in the Disclosure Package and the Final Memorandum, and all amendments or supplements to either of them, as may, in each case, be reasonably requested for use in connection with the offering and
sale of the Securities and the Guarantees; (iv) the preparation, printing, authentication, issuance and delivery of the Securities; (v) any stamp or transfer taxes in connection with the original issuance and sale of the Securities;
(vi) the printing (or reproduction) and delivery of this Agreement, any blue sky memorandum and all other agreements or documents printed (or reproduced) and delivered in connection with the offering of the Securities and the Guarantees;
(vii) any registration or qualification of the Securities and the Guarantees for offer and sale under the securities or blue sky laws of the several states, the provinces of Canada and any other jurisdictions specified pursuant to
Section 5(e) (including filing fees and the reasonable fees and expenses of counsel for the Initial Purchasers relating to such registration and qualification); (viii) the fees and expenses incurred with respect to creating, documenting and
perfecting the security interests in the Collateral as contemplated by the Collateral Trust Agreement and the Collateral Documents (including the related reasonable and documented fees and expenses of one counsel to the Initial Purchasers, taken as
a whole, prior to the Closing Date); (ix) the transportation and other expenses incurred by or on behalf of Company representatives in connection with presentations to prospective purchasers of the Securities; (x) the fees and expenses of the
Company’s accountants and the fees and expenses of counsel (including local and special counsel) for the Company; and (xi) all other costs and expenses incident to the performance by the Company of its obligations hereunder. 

6. Conditions to the Obligations of the Initial Purchasers. The obligations of the Initial Purchasers to purchase the Securities shall
be subject to the accuracy of the representations and warranties of the Company and the Guarantors contained herein at the Execution Time and the Closing Date, to the accuracy of the statements of the Company and the Guarantors made in any
certificates delivered pursuant to the provisions hereof, to the performance by the Company and the Guarantors of their respective obligations hereunder and to the following additional conditions: 

(a) The Company shall have requested and caused (i) Sidley Austin LLP, counsel for the Company, to furnish to the Representative its
opinion and negative assurance letter, each dated the Closing Date and addressed to the Representative, substantially in the form of Exhibit A-1 hereto and (ii) Vinson & Elkins LLP, tax
counsel for the Company, to furnish to the Representative its opinion, dated as of the Closing Date and addressed to the Representative, substantially in the form of Exhibit A-2 hereto. 

  
 -19- 

 (b) The Company shall have requested and caused the general counsel of the Company to
furnish the Representative an opinion, dated the Closing Date and addressed to the Representative, substantially in the form of Exhibit B hereto. 

(c) The Company shall have requested and caused local counsel for each applicable Guarantor to furnish the Representative their respective
opinions, dated the Closing Date and addressed to the Representative, substantially in the form of Exhibit C-1 (for subsidiaries incorporated or formed in Massachusetts and Pennsylvania), Exhibit C-2 (for subsidiaries incorporated or formed in Ohio) and Exhibit C-3 (for subsidiaries incorporated or formed in Virginia) hereto. 

(d) The Representative shall have received from Sullivan & Cromwell LLP, counsel for the Initial Purchasers, such opinion or opinions,
dated the Closing Date and addressed to the Representative, with respect to the issuance and sale of the Securities, the Indenture, the Disclosure Package, the Final Memorandum (as amended or supplemented at the Closing Date) and other related
matters as the Representative may reasonably require, and the Company shall have furnished to such counsel such documents as they request for the purpose of enabling them to pass upon such matters. 

(e) The Company shall have furnished to the Representative a certificate of the Company, signed by (x) the chief executive officer of the
Company and (y) the principal financial or accounting officer of the Company, dated the Closing Date, to the effect that the signers of such certificate have carefully examined the Disclosure Package and the Final Memorandum and any supplements
or amendments thereto and this Agreement and that: 
 (i) the representations and warranties of the Company and the
Guarantors in this Agreement are true and correct on and as of the Closing Date with the same effect as if made on the Closing Date, and the Company and the Guarantors have complied with all the agreements and satisfied all the conditions on its
part to be performed or satisfied hereunder at or prior to the Closing Date; and 
 (ii) since the date of the most recent
financial statements included in the Disclosure Package and the Final Memorandum (exclusive of any amendment or supplement thereto), there has been no material adverse change in the condition (financial or otherwise), prospects, business or
properties of the Company and its subsidiaries, taken as a whole, whether or not arising from transactions in the ordinary course of business, except as set forth in or contemplated in the Disclosure Package and the Final Memorandum (exclusive of
any amendment or supplement thereto). 
 (f) At the Execution Time and at the Closing Date, (i) the Company shall have requested and
caused Deloitte & Touche LLP and Ernst & Young LLP to furnish to the Representative customary comfort letters, dated respectively as of the Execution Time and as of the Closing Date, in form and substance reasonably satisfactory to
the Representative and confirming that they are independent accountants within the meaning of the Exchange Act and the applicable published rules and regulations thereunder and (ii) the Company shall have

  
 -20- 

 
furnished to the Representative a certificate of its chief financial officer, dated respectively as of the Execution Time and as of the Closing Date, in form and substance satisfactory to the
Representative and providing “management comfort” with respect to certain financial information contained in the Disclosure Package and the Final Memorandum. 

(g) Subsequent to the Execution Time or, if earlier, the dates as of which information is given in the Disclosure Package (exclusive of any
amendment or supplement thereto) and the Final Memorandum (exclusive of any amendment or supplement thereto), there shall not have been (i) any change or decrease specified in the letter or letters referred to in paragraph (f) of this
Section 6; or (ii) any change, or any development involving a prospective change, in or affecting the condition (financial or otherwise), prospects, business or properties of the Company and its subsidiaries taken as a whole, whether or
not arising from transactions in the ordinary course of business, except as set forth in or contemplated in the Disclosure Package and the Final Memorandum (exclusive of any amendment or supplement thereto), the effect of which, in any case referred
to in clause (i) or (ii) above, is, in the sole judgment of the Representative, so material and adverse as to make it impractical or inadvisable to proceed with the offering or delivery of the Securities as contemplated in the Disclosure
Package and the Final Memorandum (exclusive of any amendment or supplement thereto). 
 (h) The Securities shall be eligible for clearance
and settlement through The Depository Trust Company. 
 (i) Subsequent to the Execution Time, there shall not have been any decrease in the
rating of any of the Company’s or the Parent’s debt securities by any “nationally recognized statistical rating organization” (as defined for purposes of Rule 3(a)(62) under the Exchange Act) or any notice given of any
intended or potential decrease in any such rating or of a possible change in any such rating that does not indicate the direction of the possible change. 

(j) The Representative shall have received the results of a recent UCC lien search with the Secretary of State of each of the jurisdictions of
organization for the Company, the Guarantors and Vistra Intermediate, and such search shall reveal no liens on any of the assets of the Company, the Guarantors and Vistra Intermediate or their respective subsidiaries except for Permitted Liens. 

(k) The Initial Purchasers shall have received counterparts of the First Lien Consent that shall have been executed and delivered by duly
authorized officers of each party thereto. 
 (l) Except as otherwise contemplated by the Collateral Documents or this Agreement, each
Security Document required by the Collateral Documents, or under law or reasonably requested by the Initial Purchasers, in each case, to be filed, registered or recorded, or delivered for filing on or prior to the Closing Date, in order to create in
favor of the Collateral Trustee, for the benefit of the holders of the Securities, a perfected first-priority lien and security interests in the Collateral with respect to the Securities and Guarantees that can be perfected by the making of such
filings, registrations or recordations, prior and superior to the right of any other person (other than Permitted Liens), shall be executed and in proper form for filing, registration or recordation. 

  
 -21- 

 (m) Prior to the Closing Date, the Company shall have furnished to the Representative such
further information, certificates and documents as the Representative may reasonably request. 
 If any of the conditions specified in this
Section 6 shall not have been fulfilled when and as provided in this Agreement, or if any of the opinions and certificates mentioned above or elsewhere in this Agreement shall not be reasonably satisfactory in form and substance to the
Representative and counsel for the Initial Purchasers, this Agreement and all obligations of the Initial Purchasers hereunder may be cancelled at, or at any time prior to, the Closing Date by the Representative. Notice of such cancellation shall be
given to the Company in writing or by telephone or facsimile confirmed in writing. 
 The documents required to be delivered by this
Section 6 will be delivered at the office of counsel for the Initial Purchasers, at 1888 Century Park East, Suite 2100, Los Angeles, California 90067, on the Closing Date. 

7. Reimbursement of Expenses. If the sale of the Securities provided for herein is not consummated because any condition to the
obligations of the Initial Purchasers set forth in Section 6 hereof is not satisfied, because of any termination pursuant to Section 10 hereof or because of any refusal, inability or failure on the part of the Company to perform any
agreement herein or comply with any provision hereof other than by reason of a default by any of the Initial Purchasers, the Company will reimburse the Initial Purchasers severally through J.P. Morgan on demand for all reasonable and documented
expenses (including reasonable fees and disbursements of counsel) that shall have been incurred by them in connection with the proposed purchase and sale of the Securities. 

8. Indemnification and Contribution. (a) The Company and the Guarantors, jointly and severally, agree to indemnify and hold
harmless each Initial Purchaser, the directors, officers, employees, Affiliates and agents of each Initial Purchaser and each person who controls any Initial Purchaser within the meaning of either the Securities Act or the Exchange Act against any
and all losses, claims, damages or liabilities, joint or several, to which they or any of them may become subject under the Securities Act, the Exchange Act or other U.S. federal or state statutory law or regulation, at common law or otherwise,
insofar as such losses, claims, damages or liabilities or actions in respect thereof arise out of or are based upon any untrue statement or alleged untrue statement of a material fact contained in the Preliminary Memorandum, the Final Memorandum,
any Issuer Written Information, any General Solicitation, any document listed on Schedule IV hereto or any other written information used by or on behalf of the Company or the Guarantors in connection with the offer or sale of the Securities, or in
any amendment or supplement thereto, or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances
under which they were made, not misleading, and agrees to reimburse each such indemnified party, as incurred, for any legal or other expenses reasonably incurred by it in connection with investigating or defending any such loss, claim, damage,
liability or action; provided, however, that the Company and the Guarantors will not be liable in any such case to the extent that any such loss, claim, damage or liability arises out of or is based upon any such untrue statement or
alleged untrue statement or omission or alleged omission made in the Preliminary Memorandum, the Final Memorandum, or in any amendment thereof or 

  
 -22- 

 
supplement thereto, in reliance upon and in conformity with written information furnished to the Company by or on behalf of any Initial Purchaser through the Representative specifically for
inclusion therein. This indemnity agreement will be in addition to any liability that the Company or the Guarantors may otherwise have. 

(b) Each Initial Purchaser severally, and not jointly, agrees to indemnify and hold harmless the Company, each Guarantor, their respective
directors and officers, and each person who controls the Company or the Guarantors within the meaning of either the Securities Act or the Exchange Act, to the same extent as the foregoing indemnity to each Initial Purchaser, but only with reference
to written information relating to such Initial Purchaser furnished to the Company by or on behalf of such Initial Purchaser through the Representative specifically for inclusion in the Preliminary Memorandum or the Final Memorandum (or in any
amendment or supplement thereto). This indemnity agreement will be in addition to any liability that any Initial Purchaser may otherwise have. The Company and the Guarantors acknowledge that (i) the statements set forth in the last paragraph of
the cover page regarding delivery of the Securities and (ii) under the heading “Plan of Distribution”, the eighth and ninth paragraphs related to covering and stabilizing transactions in the Preliminary Memorandum and
the Final Memorandum constitute the only information furnished in writing by or on behalf of the Initial Purchasers for inclusion in the Preliminary Memorandum or the Final Memorandum or in any amendment or supplement thereto. 

(c) Promptly after receipt by an indemnified party under this Section 8 of notice of the commencement of any action, such indemnified
party will, if a claim in respect thereof is to be made against the indemnifying party under this Section 8, notify the indemnifying party in writing of the commencement thereof; but the failure so to notify the indemnifying party (i) will
not relieve it from liability under paragraph (a) or (b) above unless and to the extent it did not otherwise learn of such action and such failure results in the forfeiture by the indemnifying party of substantial rights and defenses and
(ii) will not, in any event, relieve the indemnifying party from any obligations to any indemnified party other than the indemnification obligation provided in paragraph (a) or (b) above. The indemnifying party shall be entitled to
appoint counsel (including local counsel) of the indemnifying party’s choice at the indemnifying party’s expense to represent the indemnified party in any action for which indemnification is sought (in which case the indemnifying party
shall not thereafter be responsible for the fees and expenses of any separate counsel, other than local counsel if not appointed by the indemnifying party, retained by the indemnified party or parties except as set forth below); provided,
however, that such counsel shall be reasonably satisfactory to the indemnified party. Notwithstanding the indemnifying party’s election to appoint counsel (including local counsel) to represent the indemnified party in an action, the
indemnified party shall have the right to employ separate counsel (including local counsel), and the indemnifying party shall bear the reasonable fees, costs and expenses of such separate counsel if (i) the use of counsel chosen by the
indemnifying party to represent the indemnified party would present such counsel with a conflict of interest; (ii) the actual or potential defendants in, or targets of, any such action include both the indemnified party and the indemnifying
party and the indemnified party shall have reasonably concluded upon the advice of counsel that there may be legal defenses available to it and/or other indemnified parties that are different from or additional to those available to the indemnifying
party; (iii) the indemnifying party shall not have employed counsel reasonably satisfactory to the indemnified party to represent the indemnified party within a reasonable time after notice of the institution of

  
 -23- 

 
such action; or (iv) the indemnifying party shall authorize the indemnified party to employ separate counsel at the expense of the indemnifying party. An indemnifying party will not, without
the prior written consent of the indemnified parties, settle or compromise or consent to the entry of any judgment with respect to any pending or threatened claim, action, suit or proceeding in respect of which indemnification or contribution may be
sought hereunder (whether or not the indemnified parties are actual or potential parties to such claim or action) unless such settlement, compromise or consent: (i) includes an unconditional release of each indemnified party from all liability
arising out of such claim, action, suit or proceeding and (ii) does not include a statement as to or an admission of fault, culpability or a failure to act, by or on behalf of any indemnified party. 

(d) In the event that the indemnity provided in paragraph (a) or (b) of this Section 8 is unavailable to or insufficient to hold
harmless an indemnified party for any reason, the Company and the Guarantors, jointly and severally, and the Initial Purchasers severally agree to contribute to the aggregate losses, claims, damages and liabilities (including legal or other expenses
reasonably incurred in connection with investigating or defending any loss, claim, damage, liability or action) (collectively “Losses”) to which the Company and the Guarantors and one or more of the Initial Purchasers may be subject in
such proportion as is appropriate to reflect the relative benefits received by the Company and the Guarantors on the one hand and by the Initial Purchasers on the other from the offering of the Securities. If the allocation provided by the
immediately preceding sentence is unavailable for any reason, the Company and the Guarantors, jointly and severally, and the Initial Purchasers severally shall contribute in such proportion as is appropriate to reflect not only such relative
benefits but also the relative fault of the Company and the Guarantors on the one hand and the Initial Purchasers on the other in connection with the statements or omissions that resulted in such Losses, as well as any other relevant equitable
considerations. Benefits received by the Company and the Guarantors shall be deemed to be equal to the total net proceeds from the offering (before deducting expenses) received by the Company, and benefits received by the Initial Purchasers shall be
deemed to be equal to the total purchase discounts and commissions. Relative fault shall be determined by reference to, among other things, whether any untrue or alleged untrue statement of a material fact or the omission or alleged omission to
state a material fact relates to information provided by the Company and the Guarantors on the one hand or the Initial Purchasers on the other, the intent of the parties and their relative knowledge, access to information and opportunity to correct
or prevent such untrue statement or omission. The Company, the Guarantors and the Initial Purchasers agree that it would not be just and equitable if contribution were determined by pro rata allocation or any other method of allocation that does not
take account of the equitable considerations referred to above. Notwithstanding the provisions of this paragraph (d), in no event shall any Initial Purchaser be required to contribute any amount in excess of the amount by which the total purchase
discounts and commissions received by such Initial Purchaser with respect to the offering of the Securities exceeds the amount of any damages that such Initial Purchaser has otherwise been required to pay by reason of such untrue or alleged untrue
statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent
misrepresentation. For purposes of this Section 8, each person who controls an Initial Purchaser within the meaning of either the Securities Act or the Exchange Act and each director, officer, employee, Affiliate and agent of an Initial
Purchaser shall have the same rights to contribution as such Initial Purchaser, and each 

  
 -24- 

 
person who controls the Company and the Guarantors within the meaning of either the Securities Act or the Exchange Act and each officer and director of the Company and the Guarantors shall have
the same rights to contribution as the Company and the Guarantors, subject in each case to the applicable terms and conditions of this paragraph (d). 

9. Default by an Initial Purchaser. If any one or more Initial Purchasers shall fail to purchase and pay for any of the Securities
agreed to be purchased by such Initial Purchaser hereunder and such failure to purchase shall constitute a default in the performance of its or their obligations under this Agreement, the remaining Initial Purchasers shall be obligated severally to
take up and pay for (in the respective proportions which the principal amount of Securities set forth opposite their names on Schedule I hereto bears to the aggregate principal amount of Securities set forth opposite the names of all the
remaining Initial Purchasers on Schedule I hereto) the Securities which the defaulting Initial Purchaser or Initial Purchasers agreed but failed to purchase; provided, however, that in the event that the aggregate principal amount of
Securities which the defaulting Initial Purchaser or Initial Purchasers agreed but failed to purchase shall exceed 10% of the aggregate principal amount of Securities set forth in Schedule I hereto, the remaining Initial Purchasers shall have
the right to purchase all, but shall not be under any obligation to purchase any, of the Securities, and if such nondefaulting Initial Purchasers do not purchase all the Securities, this Agreement will terminate without liability to any
nondefaulting Initial Purchaser or the Company. In the event of a default by any Initial Purchaser as set forth in this Section 9, the Closing Date shall be postponed for such period, not exceeding five Business Days, as the Representative
shall determine in order that the required changes in the Final Memorandum or in any other documents or arrangements may be effected. Nothing contained in this Agreement shall relieve any defaulting Initial Purchaser of its liability, if any, to the
Company or any nondefaulting Initial Purchaser for damages occasioned by its default hereunder. 
 10. Termination. This Agreement
shall be subject to termination in the absolute discretion of the Representative, by notice given to the Company prior to delivery of and payment for the Securities, if at any time prior to such time (i) trading of the common stock of the
Parent shall have been suspended on the New York Stock Exchange or any other United States national securities exchange; (ii) trading in securities generally on the New York Stock Exchange shall have been suspended or limited or minimum prices
shall have been established on such exchange; (iii) a banking moratorium shall have been declared either by U.S. federal or New York State authorities; (iv) there shall have occurred a material disruption in commercial banking or
securities settlement or clearance services; or (v) there shall have occurred any outbreak or escalation of hostilities, declaration by the United States of a national emergency or war or other calamity or crisis, in each case, the
effect of which on financial markets is such as to make it, in the sole judgment of the Representative impractical or inadvisable to proceed with the offering, sale or delivery of the Securities as contemplated in the Disclosure Package and the
Final Memorandum (exclusive of any amendment or supplement thereto). 
 11. Representations and Indemnities to Survive. The respective
agreements, representations, warranties, indemnities and other statements of the Company, the Guarantors or their officers and of the Initial Purchasers set forth in or made pursuant to this Agreement will remain in full force and effect, regardless
of any investigation made by or on behalf of the Initial Purchasers or the Company or any of the indemnified persons referred to in Section 8 hereof, and will survive delivery of and payment for the Securities. The provisions of Sections 7
and 8 hereof shall survive the termination or cancellation of this Agreement. 

  
 -25- 

 12. Notices. All communications hereunder will be in writing and effective only on
receipt, and, if sent to the Representative, will be mailed, delivered or telefaxed to the Investment Grade Syndicate Desk of J.P. Morgan (fax no.: 212-834-6081) and
confirmed to J.P. Morgan Securities LLC, 383 Madison Avenue, New York, New York 10179, Attention: Investment Grade Syndicate Desk; or, if sent to the Company, will be mailed, delivered or telefaxed to 972-556-6119 and confirmed to it at 6555 Sierra Drive, Irving, Texas 75039, attention of the Legal Department. 

13. Successors. This Agreement will inure to the benefit of and be binding upon the parties hereto and their respective successors and
the indemnified persons referred to in Section 8 hereof and their respective successors, and, except as expressly set forth in Section 5(k) hereof, no other person will have any right or obligation hereunder. 

14. Integration. This Agreement supersedes all prior agreements and understandings (whether written or oral) between the Company, the
Guarantors and the Initial Purchasers, or any of them, with respect to the subject matter hereof. 
 15. Applicable Law. This
Agreement, and any claim, controversy or dispute arising under or related to this Agreement, will be governed by and construed in accordance with the laws of the State of New York applicable to contracts made and to be performed within the State of
New York. 
 16. Waiver of Jury Trial. The Company and the Guarantors each irrevocably waives, to the fullest extent permitted by
applicable law, any and all right to trial by jury in any legal proceeding arising out of or relating to this Agreement or the transactions contemplated hereby. 

17. No Fiduciary Duty. The Company and the Guarantors hereby acknowledge that (a) the purchase and sale of the Securities pursuant
to this Agreement is an arm’s-length commercial transaction between the Company and the Guarantors, on the one hand, and the Initial Purchasers and any Affiliate through which it may be acting, on the
other, (b) the Initial Purchasers are acting as principal and not as an agent or fiduciary of the Company or the Guarantors and (c) the Company’s and the Guarantors’ engagement of the Initial Purchasers in connection with the
offering and the process leading up to the offering is as independent contractors and not in any other capacity. Furthermore, the Company and the Guarantors agree that they are solely responsible for making their own judgments in connection with the
offering (irrespective of whether any of the Initial Purchasers has advised or is currently advising the Company or the Guarantors on related or other matters). The Company and the Guarantors agree that they will not claim that the Initial
Purchasers have rendered advisory services of any nature or respect, or owe an agency, fiduciary or similar duty to the Company or the Guarantors, in connection with such transaction or the process leading thereto. 

  
 -26- 

 18. Waiver of Tax Confidentiality. Notwithstanding anything herein to the contrary,
purchasers of the Securities (and each employee, representative or other agent of a purchaser) may disclose to any and all persons, without limitation of any kind, the U.S. tax treatment and U.S. tax structure of any transaction contemplated herein
and all materials of any kind (including opinions or other tax analyses) that are provided to the purchasers of the Securities relating to such U.S. tax treatment and U.S. tax structure, other than any information for which nondisclosure is
reasonably necessary in order to comply with applicable securities laws. 
 19. Counterparts. This Agreement may be signed in one or
more counterparts, each of which shall constitute an original and all of which together shall constitute one and the same agreement. 
 20.
Headings. The section headings used herein are for convenience only and shall not affect the construction hereof. 
 21.
Recognition of the U.S. Special Resolution Regimes. 
 (a) In the event that any Initial Purchaser that is a Covered Entity becomes
subject to a proceeding under a U.S. Special Resolution Regime, the transfer from such Initial Purchaser of this Agreement, and any interest and obligation in or under this Agreement, will be effective to the same extent as the transfer would be
effective under the U.S. Special Resolution Regime if this Agreement, and any such interest and obligation, were governed by the laws of the United States or a state of the United States. 

(b) In the event that any Initial Purchaser that is a Covered Entity or a BHC Act Affiliate of such Initial Purchaser becomes subject to a
proceeding under a U.S. Special Resolution Regime, Default Rights under this Agreement that may be exercised against such Initial Purchaser are permitted to be exercised to no greater extent than such Default Rights could be exercised under the U.S.
Special Resolution Regime if this Agreement were governed by the laws of the United States or a state of the United States. 
 (c) For the
purpose of this Section 21, 
 “BHC Act Affiliate” has the meaning assigned to the term “affiliate”
in, and shall be interpreted in accordance with, 12 U.S.C. § 1841(k). 
 “Covered Entity” means any of the
following: 
 (i) a “covered entity” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 252.82(b);

 (ii) a “covered bank” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 47.3(b); or 

(iii) a “covered FSI” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 382.2(b). 

“Default Right” has the meaning assigned to that term in, and shall be interpreted in accordance with, 12 C.F.R.
§§ 252.81, 47.2 or 382.1, as applicable. 

  
 -27- 

 “U.S. Special Resolution Regime” means each of (i) the
Federal Deposit Insurance Act and the regulations promulgated thereunder and (ii) Title II of the Dodd-Frank Wall Street Reform and Consumer Protection Act and the regulations promulgated thereunder. 

If the foregoing is in accordance with your understanding of our agreement, please sign and return to us the enclosed duplicate hereof,
whereupon this letter and your acceptance shall represent a binding agreement between the Company, the Guarantors and the several Initial Purchasers. 

  
 -28- 

 
			
	Very truly yours,
	
	Vistra Operations Company LLC, as Issuer
		
	By:	 	 /s/ Kristopher E. Moldovan

		 	Name: Kristopher E. Moldovan
		 	Title:    Senior Vice President and Treasurer
	
	ANP Bellingham Energy Company, LLC
	ANP Blackstone Energy Company, LLC
	Big Brown Power Company LLC
	Brightside Solar, LLC
	Calumet Energy Team, LLC
	Casco Bay Energy Company, LLC
	Coffeen and Western Railroad Company
	Coleto Creek Power, LLC
	Comanche Peak Power Company LLC
	Core Solar SPV I, LLC
	Dallas Power & Light Company, Inc.
	Dynegy Administrative Services Company
	Dynegy Associates Northeast LP, Inc.
	Dynegy Coal Generation, LLC
	Dynegy Coal Holdco, LLC
	Dynegy Coal Trading & Transportation, L.L.C.
	Dynegy Commercial Asset Management, LLC
	Dynegy Conesville, LLC
	Dynegy Dicks Creek, LLC
	Dynegy Energy Services (East), LLC
	Dynegy Energy Services, LLC
	Dynegy Fayette II, LLC
	Dynegy Gas Imports, LLC
	Dynegy Hanging Rock II, LLC
	Dynegy Kendall Energy, LLC
	Dynegy Killen, LLC
	Dynegy Marketing and Trade, LLC
	Dynegy Miami Fort, LLC
	Dynegy Midwest Generation, LLC
	Dynegy Morro Bay, LLC
	Dynegy Moss Landing, LLC
	Dynegy Northeast Generation GP, Inc.
	Dynegy Oakland, LLC
	Dynegy Operating Company
	Dynegy Power Generation Inc.
	Dynegy Power Marketing, LLC

 (Signature Page to Purchase Agreement) 

 
	
	Dynegy Power, LLC
	Dynegy Resource II, LLC
	Dynegy Resources Generating Holdco, LLC
	Dynegy South Bay, LLC
	Dynegy Stuart, LLC
	Dynegy Washington II, LLC
	Dynegy Zimmer, LLC
	Emerald Grove Solar, LLC
	Ennis Power Company, LLC
	EquiPower Resources Corp.
	Generation SVC Company
	Hallmark Solar, LLC
	Havana Dock Enterprises, LLC
	Hays Energy, LLC
	Hopewell Power Generation, LLC
	Illinois Power Generating Company
	Illinois Power Marketing Company
	Illinois Power Resources Generating, LLC
	Illinois Power Resources, LLC
	Illinova Corporation
	IPH, LLC
	Kincaid Generation, L.L.C.
	La Frontera Holdings, LLC
	Lake Road Generating Company, LLC
	Liberty Electric Power, LLC
	Lone Star Energy Company, Inc.
	Lone Star Pipeline Company, Inc.
	Luminant Energy Company LLC
	Luminant Energy Trading California Company
	Luminant ET Services Company LLC
	Luminant Generation Company LLC
	Luminant Mining Company LLC
	Masspower, LLC
	Midlothian Energy, LLC
	Milford Power Company, LLC
	Moss Landing Energy Storage 1, LLC
	NCA Resources Development Company LLC
	NEPCO Services Company
	Northeastern Power Company
	Oak Grove Management Company LLC
	Ontelaunee Power Operating Company, LLC
	Pleasants Energy, LLC
	Richland-Stryker Generation LLC
	Sandow Power Company LLC
	Sithe Energies, Inc.
	Sithe/Independence LLC

  
 (Signature Page to
Purchase Agreement) 

 
	
	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.
	T-Fuels, LLC
	TXU Electric Company, Inc.
	TXU Energy Retail Company LLC
	TXU Retail Services Company
	Upton County Solar 2, LLC
	Value Based Brands LLC
	Vistra Asset Company LLC
	Vistra Corporate Services Company
	Vistra EP Properties Company
	Vistra Finance Corp.
	Vistra Insurance Solutions LLC
	Vistra Preferred Inc.
	Volt Asset Company, Inc.
	Wharton County Generation, LLC
	Wise County Power Company, LLC
	Wise-Fuels Pipeline, Inc., as Guarantors

  

			
	By:	 	 /s/ Kristopher E. Moldovan

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

  
 (Signature Page to
Purchase Agreement) 

			
	The foregoing Agreement is hereby confirmed and accepted as of the date first above written.
	
	J.P. MORGAN SECURITIES LLC
		
	By:	 	 /s/ Som Bhattacharyya

		 	Name: Som Bhattacharyya
		 	Title: Executive Director
	
	For itself and the other several Initial Purchasers named in Schedule I to the foregoing Agreement.

  
 (Signature Page to
Purchase Agreement) 

 SCHEDULE I 

 

									
	 Initial Purchasers
	  	Principal Amount
of 2024 Notes to be
Purchased	 	  	Principal Amount
of 2027 Notes to
be Purchased	 
	 J.P. Morgan Securities LLC
	  	U.S$	36,000,000	 	  	U.S$	96,000,000	 
	 Citigroup Global Markets Inc.
	  	$	36,000,000	 	  	$	96,000,000	 
	 Credit Suisse Securities (USA) LLC
	  	$	24,000,000	 	  	$	64,000,000	 
	 Morgan Stanley & Co. LLC
	  	$	36,000,000	 	  	$	96,000,000	 
	 MUFG Securities Americas Inc.
	  	$	36,000,000	 	  	$	96,000,000	 
	 Barclays Capital Inc.
	  	$	10,500,000	 	  	$	28,000,000	 
	 BMO Capital Markets Corp.
	  	$	10,500,000	 	  	$	28,000,000	 
	 BNP Paribas Securities Corp.
	  	$	10,500,000	 	  	$	28,000,000	 
	 Credit Agricole Securities (USA) Inc.
	  	$	10,500,000	 	  	$	28,000,000	 
	 Deutsche Bank Securities Inc.
	  	$	10,500,000	 	  	$	28,000,000	 
	 Goldman Sachs & Co. LLC
	  	$	10,500,000	 	  	$	28,000,000	 
	 Mizuho Securities USA LLC
	  	$	10,500,000	 	  	$	28,000,000	 
	 Natixis Securities Americas LLC
	  	$	36,000,000	 	  	$	96,000,000	 
	 RBC Capital Markets, LLC
	  	$	10,500,000	 	  	$	28,000,000	 
	 SunTrust Robinson Humphrey, Inc.
	  	$	10,500,000	 	  	$	28,000,000	 
	 UBS Securities LLC
	  	$	1,500,000	 	  	$	4,000,000	 
	 Total
	  	$	300,000,000	 	  	$	800,000,000	 
		  	  
	  
	 	  	  
	  
	 

 SCHEDULE II 

Vistra Operations Company LLC 

$300,000,000 
 3.55%
Senior Secured Notes Due 2024 
 $800,000,000 

3.70% Senior Secured Notes Due 2027 

The information in this term sheet supplements the Company’s preliminary offering memorandum dated November 6, 2019 (the “Preliminary
Memorandum”) and supersedes the information in the Preliminary Memorandum to the extent inconsistent with the information in the Preliminary Memorandum. This term sheet is qualified in its entirety by reference to the Preliminary Memorandum.

  

			
	Issuer	  	Vistra Operations Company LLC
		
	Notes Offered	  	3.55% Senior Secured Notes due 2024 (the “2024 Notes”) and 3.70% Senior Secured Notes due 2027 (the “2027 Notes,” and together with the 2024 Notes, the “Notes”)
		
	Maturity Date	  	2024 Notes: July 15, 2024
		
		  	2027 Notes: January 30, 2027
		
	Principal Amount	  	2024 Notes: $300,000,000
		
		  	2027 Notes: $800,000,000
		
	Gross Proceeds	  	2024 Notes: $305,346,000
		
		  	2027 Notes: $798,312,000
		
	Distribution	  	144A/Reg S
		
	Expected Ratings*	  	Ba1 (+) / BBB- (+) / BBB- (stable) (Moody’s / S&P / Fitch)
		
	Interest Rate	  	2024 Notes: 3.55%
		
		  	2027 Notes: 3.70%
		
	Price to Public	  	2024 Notes: 101.782% of the principal amount, plus accrued interest from June 11, 2019 to, but excluding, the settlement date
		
		  	2027 Notes: 99.789% of the principal amount
		
	Yield to Maturity	  	2024 Notes: 3.129%
		
		  	2027 Notes: 3.732%

			
	Reference Treasury	  	2024 Notes: United States Treasury 1.50% due October 31, 2024
		
		  	2027 Notes: United States Treasury 1.625% due October 31, 2026
		
	Spread to Treasury	  	2024 Notes: T + 150 bps
		
		  	2027 Notes: T + 200 bps
		
	Security	  	Secured on a first-priority basis by liens on substantially all of the current and after-acquired assets, rights and properties of the Company and the Guarantors and a pledge of equity interests of the Company by Vistra
Intermediate, subject to permitted liens and certain exceptions.
		
	Interest Payment Dates	  	Semi-annually in arrears on January 15 and July 15 of each year, with respect to the 2024 Notes, and on January 30 and July 30 of each year, with respect to the 2027 Notes
		
	First Interest Payment Date	  	2024 Notes: January 15, 2020
		
		  	2027 Notes: July 30, 2020
		
	Record Dates	  	2024 Notes: January 1 and July 1
		
		  	2027 Notes: January 15 and July 15
		
	Change of Control Triggering Event	  	Investor put at 101%
		
	Optional Redemption	  	At any time prior to June 15, 2024 (one month prior to their maturity), with respect to the 2024 Notes, or at any time prior to November 30, 2026 (two months prior to their maturity), with respect to the 2027 Notes, in
each case, at a redemption price equal to 100% of the principal amount of the Notes to be redeemed and the applicable “make-whole” premium together with accrued and unpaid interest to, but excluding, the date of such redemption;
and
		
		  	at any time on or after June 15, 2024 (one month prior to their maturity), with respect to the 2024 Notes, or at any time on or after November 30, 2026 (two months prior to their maturity), with respect to the 2027 Notes,
in each case, at a redemption price equal to 100% of the principal amount of Notes to be redeemed together with accrued and unpaid interest to, but excluding, the date of such redemption.
		
	Make Whole	  	2024 Notes: T + 30 bps
		
		  	2027 Notes: T + 30 bps

  
 Schedule II-2 

			
	Joint Bookrunners	  	J.P. Morgan Securities LLC, Citigroup Global Markets Inc., Credit Suisse Securities (USA) LLC, Morgan Stanley & Co. LLC, MUFG Securities Americas Inc., Barclays Capital Inc., BMO Capital Markets Corp., BNP Paribas
Securities Corp., Credit Agricole Securities (USA) Inc., Deutsche Bank Securities Inc., Goldman Sachs & Co. LLC, Mizuho Securities USA LLC, Natixis Securities Americas LLC, RBC Capital Markets, LLC and SunTrust Robinson Humphrey,
Inc.
		
	Co-Manager	  	UBS Securities LLC
		
	Trade Date	  	November 6, 2019
		
	Settlement Date	  	November 15, 2019
		
	2024 Note CUSIPs	  	92840V AD4 (Rule 144A)
		
		  	U9226V AG2 (Regulation S) 
		
	2024 Note ISINs	  	US92840VAD47 (Rule 144A)
		
		  	USU9226VAG24 (Regulation S)
		
	2027 Note CUSIPs	  	92840 VAG7 (Rule 144A)
		
		  	U9226 VAF4 (Regulation S) 
		
	2027 Note ISINs	  	US92840VAG77 (Rule 144A)
		
		  	USU9226VAF41 (Regulation S)

 This communication is confidential and is intended for the sole use of the person to whom it is provided by the sender. This
information does not purport to be a complete description of the Notes or the offering. Please refer to the Preliminary Memorandum for a complete description. 

This communication does not constitute an offer to sell or the solicitation of an offer to buy any Notes in any jurisdiction to any person to whom it is
unlawful to make such offer or solicitation in such jurisdiction. 
 These Notes have not been registered under the Securities Act of 1933, as amended (the
“Securities Act”), and the rules and regulations promulgated thereunder and may only be sold to qualified institutional buyers in reliance on Rule 144A under the Securities Act and to persons outside the United States in compliance with
Regulation S under the Securities Act. 
  

	*	 A securities rating is not a recommendation to buy, sell or hold securities and may be subject to revision or
withdrawal at any time. 

 ANY DISCLAIMERS OR OTHER NOTICES THAT MAY APPEAR BELOW ARE NOT APPLICABLE TO THIS COMMUNICATION AND SHOULD BE
DISREGARDED. SUCH DISCLAIMERS OR OTHER NOTICES WERE AUTOMATICALLY GENERATED AS A RESULT OF THIS COMMUNICATION BEING SENT VIA BLOOMBERG OR ANOTHER EMAIL SYSTEM. 

  
 Schedule II-3 

 SCHEDULE III 

Schedule of Written General Solicitation Materials 

None. 

 SCHEDULE IV 

 

	1.	 November 2019 Investor Presentation of Vistra Energy 

 

	2.	 NetRoadshow Presentation regarding the offering of the Securities 

 ANNEX A 

Significant Subsidiaries 
  

			
	1	  	ANP Bellingham Energy Company, LLC
		
	2	  	ANP Blackstone Energy Company, LLC
		
	3	  	Casco Bay Energy Company, LLC
		
	4	  	Coleto Creek Power, LLC
		
	5	  	Comanche Peak Power Company LLC
		
	6	  	Dynegy Coal Generation, LLC
		
	7	  	Dynegy Coal Holdco, LLC
		
	8	  	Dynegy Commercial Asset Management, LLC
		
	9	  	Dynegy Energy Services (East), LLC
		
	10	  	Dynegy Energy Services, LLC
		
	11	  	Dynegy Fayette II, LLC
		
	12	  	Dynegy Hanging Rock II, LLC
		
	13	  	Dynegy Marketing and Trade, LLC
		
	14	  	Dynegy Miami Fort, LLC
		
	15	  	Dynegy Midwest Generation, LLC
		
	16	  	Dynegy Moss Landing, LLC
		
	17	  	Dynegy Power Generation Inc.
		
	18	  	Dynegy Power, LLC
		
	19	  	Dynegy Resource II, LLC
		
	20	  	Dynegy Zimmer, LLC
		
	21	  	Electric Energy, Inc.
		
	22	  	Ennis Power Company, LLC
		
	23	  	Equipower Resources Corp.
		
	24	  	Hays Energy, LLC
		
	25	  	Hopewell Power Generation, LLC
		
	26	  	Illinois Power Generating Company
		
	27	  	Illinois Power Marketing Company
		
	28	  	Illinois Power Resources Generating, LLC
		
	29	  	Illinois Power Resources, LLC
		
	30	  	IPH, LLC
		
	31	  	Kincaid Generation, L.L.C.
		
	32	  	La Frontera Holdings, LLC

			
	33	  	Lake Road Generating Company, LLC
		
	34	  	Liberty Electric Power, LLC
		
	35	  	Luminant Energy Company LLC
		
	36	  	Luminant Mining Company LLC
		
	37	  	Masspower, LLC
		
	38	  	Midlothian Energy, LLC
		
	39	  	Midwest Electric Power, Inc.
		
	40	  	Milford Power Company, LLC
		
	41	  	North Jersey Energy Associates, LP
		
	42	  	Northeast Energy Associates, LP
		
	43	  	Northeastern Power Company
		
	44	  	Oak Grove Management Company LLC
		
	45	  	Ontelaunee Power Operating Company, LLC
		
	46	  	Pleasants Energy, LLC
		
	47	  	Sithe Energies, Inc.
		
	48	  	Sithe/Independence, LLC
		
	49	  	TXU Energy Retail Company LLC
		
	50	  	Vistra Asset Company LLC
		
	51	  	Vistra EP Properties Company
		
	52	  	Vistra Preferred Inc.

  
 Annex A-2 

 EXHIBIT A-1 

OPINION AND DISCLOSURE LETTER OF 

SIDLEY AUSTIN LLP 
 Based
on and subject to the foregoing and the other limitations, qualifications, exceptions and assumptions set forth herein, we are of the opinion that: 

(i) The Company is a limited liability company validly existing and in good standing under the laws of the State of Delaware.
The Company has limited liability company power and authority to own, lease and operate its properties and to conduct its business as described in the Disclosure Package (as defined below) and the Offering Memorandum and to execute, deliver and
perform its obligations under the Purchase Agreement, the Indenture, the Notes, the Collateral Documents, the Designation and the First Lien Consent. 

(ii) Each Corporate Guarantor is a corporation validly existing and in good standing under the laws of the state of its
incorporation. Each Corporate Guarantor has corporate power and authority to own, lease and operate its properties and to conduct its business as described in the Disclosure Package and the Offering Memorandum and to execute, deliver and perform its
obligations under the Purchase Agreement, the Indenture, its Guarantee, the Collateral Documents and the First Lien Consent. 

(iii) Each LLC Guarantor is a limited liability company validly existing and in good standing under the laws of the state of
its formation. Each LLC Guarantor has limited liability company power and authority to own, lease and operate its properties and to conduct its business as described in the Disclosure Package and the Offering Memorandum and to execute, deliver and
perform its obligations under the Purchase Agreement, the Indenture, its Guarantee, the Collateral Documents and the First Lien Consent. 

(iv) The Purchase Agreement has been duly authorized, executed and delivered by the Company and each Covered Guarantor. 

(v) The Notes have been duly authorized by the Company. When the Notes are duly executed by authorized officers of the Company
and authenticated by the Trustee, all in accordance with the Indenture, and delivered to and paid for by the Initial Purchasers in accordance with the Purchase Agreement, the Notes will be valid and binding obligations of the Company, enforceable
against the Company in accordance with their terms, and will be entitled to the benefits of the Indenture. 
 (vi) The
Guarantee by each Covered Guarantor has been duly authorized by each Covered Guarantor. When the Notes are duly executed by authorized officers of the Company and authenticated by the Trustee, all in accordance with the Indenture, and delivered to
and paid for by the Initial Purchasers in accordance with the Purchase Agreement, the Guarantee by each Guarantor will be the valid and binding obligation of such Guarantor, enforceable against such Guarantor in accordance with its terms. 

 (vii) No consent, approval, authorization or other order of any federal
regulatory body, federal administrative agency or other federal governmental body of the United States of America or any state regulatory body, state administrative agency or other state governmental body of the State of Illinois, the State of Texas
or the State of New York is required under Applicable Laws for the execution and delivery by the Company or any Covered Guarantor of the Purchase Agreement, the Fourth Supplemental Indenture, the Designation or the First Lien Consent, as applicable,
and the issuance and sale of the Securities to the Initial Purchasers as contemplated by the Purchase Agreement or the performance by the Company, Vistra Intermediate and each Covered Guarantor of their obligations under the Collateral Documents to
which they are a party, except those filings required to perfect the lien provided for in any Note Security Document (as defined in the Indenture). 

(viii) The execution and delivery by the Company of the Designation, by the Company, Vistra Intermediate and the Covered
Guarantors of the First Lien Consent, and by the Company and each Covered Guarantor of the Purchase Agreement and the Fourth Supplemental Indenture, and the issuance and sale of the Securities to the Initial Purchasers pursuant to the Purchase
Agreement and the performance by the Company, Vistra Intermediate and each Covered Guarantor of their obligations under the Collateral Documents to which they are a party, do not (a) violate the certificate of incorporation or by-laws of the Company, Vistra Intermediate or any Corporate Guarantor or the certificate of formation or limited liability company agreement of any LLC Guarantor, (b) result in any breach of, or constitute a
default under, any of the agreements or instruments listed on Schedule IV hereto or (c) result in a violation by the Company, Vistra Intermediate or any Covered Guarantor of any of the terms and provisions of any Applicable Laws. 

(ix) The statements in the Preliminary Offering Memorandum and the Offering Memorandum under the caption “Description of
Notes,” to the extent that such statements purport to describe certain provisions of the Indenture or the Securities, accurately describe such provisions in all material respects. 

(x) The Indenture has been duly authorized, executed and delivered by the Company and each Covered Guarantor. The Designation
has been duly authorized, executed and delivered by the Company. Each of the Collateral Trust Agreement, the Pledge Agreement, the Security Agreement and the First Lien Consent have been duly authorized, executed and delivered by the Company, Vistra
Intermediate and each Covered Guarantor. The Indenture and each of the Collateral Documents to which the Company, Vistra Intermediate or any Covered Guarantor is a party constitute a valid and binding agreement of the Company and each such Covered
Guarantor, as applicable, enforceable against the Company and each such Covered Guarantor, as applicable, in accordance with its terms. 

(xi) Assuming (A) the accuracy and performance of, and compliance with, the representations, warranties and agreements of
the Company, the Guarantors and the Initial Purchasers set forth in the Purchase Agreement and (B) the accuracy and performance of, and compliance with, the representations, warranties and agreements of each of the persons to whom the Initial
Purchasers initially offer, resell or otherwise transfer the Securities as set forth in the Offering Memorandum under the caption “Notice to Investors,” it is not 

 
necessary, in connection with the sale of the Securities to the Initial Purchasers under the Purchase Agreement or in connection with the initial resale of the Securities by the Initial
Purchasers, in each case in the manner contemplated by the Purchase Agreement and the Offering Memorandum, to register the Securities under the 1933 Act or to qualify the Indenture under the 1939 Act, it being understood that we express no opinion
as to any subsequent resale or other transfer of any Securities. 
 (xii) The statements in the Annual Report on Form 10-K for the fiscal year ended December 31, 2018, filed by Vistra Energy Corporation with the Securities and Exchange Commission on February 28, 2019, to the extent that such statements purport to describe
matters of United States federal environmental law, accurately describe such matters in all material respects. 
 (xiii) The
Company and each Applicable Guarantor is not and, after giving effect to the offering and sale of the Notes and the application of the proceeds thereof as described in the Offering Memorandum, will not be required to be registered as an
“investment company” as defined in the 1940 Act. 
 (xiv) The provisions of the Security Agreement are effective to
create in favor of the Collateral Trustee for the benefit of the Secured Parties (as defined in the Security Agreement) a valid security interest in the Company’s and each Guarantor’s rights in the Article 9 Security Agreement Collateral
as security for the Obligations (as defined in the Indenture) in respect of the Notes and the Guarantees. 
 (xv) The
provisions of the Pledge Agreement are effective to create in favor of the Collateral Trustee for the benefit of the Secured Parties (as defined in the Pledge Agreement) a valid security interest in the Company’s and each Guarantor’s
rights in the Article 9 Pledge Agreement Collateral as security for the Obligations (as defined in the Indenture) in respect of the Notes and the Guarantees. 

(xvi) Assuming that the Delaware Financing Statements have not been assigned, released, terminated or modified since the date
of the applicable UCC Search Report, the filing of the Delaware Financing Statements in the Delaware Filing Office is effective to perfect the Collateral Trustee’s security interest in the Article 9 Collateral of the Delaware Opinion Parties to
the extent a security interest therein can be perfected by the filing of financing statements in the Delaware Filing Office under the DE-UCC. 

(xvii) Assuming that the Illinois Financing Statements have not been assigned, released, terminated or modified since the date
of the applicable UCC Search Report, the filing of the Illinois Financing Statements in the Illinois Filing Office is effective to perfect the Collateral Trustee’s security interest in the Article 9 Collateral of the Illinois Opinion Parties to
the extent a security interest therein can be perfected by the filing of financing statements in the Illinois Filing Office under the IL-UCC. 

(xviii) Assuming that the Texas Financing Statements have not been assigned, released, terminated or modified since the date of
the applicable UCC Search Report, the filing of the Texas Financing Statements in the Texas Filing Office is effective to perfect the Collateral Trustee’s security interest in the Article 9 Collateral of the Texas Opinion Parties to the extent
a security interest therein can be perfected by the filing of financing statements in the Texas Filing Office under the TX-UCC. 

 EXHIBIT A-2 

OPINION OF 

VINSON & ELKINS LLP 

Based on such facts and subject to the qualifications, assumptions and limitations set forth herein and in the Preliminary Memorandum and
Final Memorandum, we hereby confirm that the statements in the Preliminary Memorandum and Final Memorandum under the caption “Certain U.S. Federal Income Tax Considerations,” insofar as such statements purport to constitute summaries of
United States federal income tax law and regulations or legal conclusions with respect thereto, have been reviewed by us and are accurate in all material respects. 

 EXHIBIT B 

OPINION OF VISTRA OPERATIONS COMPANY LLC 

GENERAL COUNSEL 
 Based on
and subject to the foregoing and the other limitations, qualifications, exceptions and assumptions set forth herein, I am of the opinion that the Company has an authorized capitalization as set forth in the Preliminary Offering Memorandum and the
Offering Memorandum under the heading “Capitalization” and all of the outstanding shares of capital stock or other equity interests of each Guarantor have been duly and validly authorized and issued, and, in the case of capital stock, are
fully paid and non-assessable. I am also of the opinion that there is no pending or, to my knowledge, threatened action, suit or proceeding by or before any court or governmental agency, authority or body or
any arbitrator involving the Company or any of its subsidiaries or its or their property that is not adequately disclosed in the Preliminary Offering Memorandum and Offering Memorandum, except in each case for such proceedings that, if the subject
of an unfavorable decision, ruling or finding would not singly or in the aggregate, have a Material Adverse Effect as such term is defined in the Purchase Agreement. 

 EXHIBIT C-1 

OPINION FROM MASSACHUSETTS/PENNSYLVANIA COUNSEL 

Based upon the foregoing, and subject to the assumptions, limitations and qualifications stated herein, it is our opinion that: 

1. Each of NEPCO and NPC is a corporation validly existing and, as of the date of the Subsistence Certificate referenced on Schedule I
hereto, subsisting under the laws of the Commonwealth of Pennsylvania. Each of NEPCO and NPC has the corporate power and authority to own, lease and operate its properties and to conduct its business as described in the Disclosure Package and the
Offering Memorandum and to execute, deliver and perform its obligations under the Purchase Agreement, the Indenture, the Collateral Trust Agreement, the Security Agreement, the Pledge Agreement, the First Lien Consent and its Guarantee. 

2. Masspower is a limited liability company validly existing and, as of the date of the Good Standing Certificate referenced on Schedule
I hereto, in good standing under the laws of the Commonwealth of Massachusetts. Masspower has the limited liability company power and authority to own, lease and operate its properties and to conduct its business as described in the Disclosure
Package and the Offering Memorandum and to execute, deliver and perform its obligations under the Purchase Agreement, the Indenture, the Collateral Trust Agreement, the Security Agreement, the Pledge Agreement, the First Lien Consent and its
Guarantee. 
 3. Each of the Purchase Agreement, the Indenture, the Collateral Trust Agreement, the Security Agreement, the Pledge Agreement
and the First Lien Consent has been duly authorized, executed and delivered by each Specified Guarantor and is a valid and binding agreement of each Specified Guarantor. 

4. The Guarantee by each Specified Guarantor has been duly authorized, executed and delivered by each Specified Guarantor. 

5. No consent, approval, authorization or other order of any federal regulatory body, federal administrative agency or other federal
governmental body of the United States of America or any state regulatory body, state administrative agency or other state governmental body of the Commonwealth of Pennsylvania, is required for the execution and delivery by the Pennsylvania
Guarantors of the Purchase Agreement, the Indenture, the Collateral Trust Agreement, the Security Agreement, the Pledge Agreement and the First Lien Consent, and the issuance and sale of the Guarantees by the Pennsylvania Guarantors to the Initial
Purchasers, all as contemplated by the Purchase Agreement. 
 6. The execution and delivery by each Specified Guarantor of the Purchase
Agreement, the Indenture, [the Collateral Trust Agreement,] the Security Agreement, the Pledge Agreement and the First Lien Consent, and the issuance and sale of the Securities to the Initial Purchasers pursuant to the Purchase Agreement, do not
(a) violate the certificate of incorporation or by-laws of either NEPCO or NPC or the certificate of formation or limited liability company agreement of Masspower, or (b) result in a violation by any
Specified Guarantor of any Applicable Laws. 

 7. Assuming that the PA Financing Statements and the MA Financing Statement have not been
released, terminated or modified since the date of the applicable UCC Search Report, the security interest granted in the Article 9 Collateral pursuant to the provisions of the Security Agreement and the Pledge Agreement in favor of the Collateral
Trustee set forth therein is perfected to the extent a security interest in the Article 9 Collateral may be perfected by the filing of a financing statement in the applicable Filing Office under Article 9 of the PA UCC or Article 9 of the MA UCC, as
applicable. 

 EXHIBIT C-2 

OPINION FROM OHIO COUNSEL 

Based on the foregoing, we advise you as follows: 

1. The Ohio Guarantor is a limited liability company under the Ohio Limited Liability Companies Act with limited liability company power and
authority to own, lease and operate its properties and to conduct its business as described in the Disclosure Package and the Offering Memorandum and to enter into the Opinion Documents to which it is a party and perform its obligations thereunder.

 2. The Ohio Guarantor has duly authorized the execution and delivery of the Opinion Documents to which it is a party and the performance
of its obligations thereunder. 
 3. Each of the Opinion Documents has been duly executed and delivered by the Ohio Guarantor, to the extent
it is a party thereto. 
 4. The execution and delivery by the Ohio Guarantor of each of the Opinion Documents to which it is party do not
(a) violate the Governing Documents of the Ohio Guarantor and (b) result in a violation by the Ohio Guarantor of any Applicable Laws. 

5. No consent, approval, license or exemption by, or order or authorization of, or filing, recording or registration with any federal
regulatory body, federal administrative agency or other federal governmental body of the United States of America or any state regulatory body, state administrative agency or other state governmental body of the State of Ohio is required to be
obtained or made under Applicable Laws by the Ohio Guarantor for the execution and delivery by the Ohio Guarantor of the Opinion Documents to which it is party, in each case in the manner set forth and subject to the terms and conditions in the
Purchase Agreement, the Indenture and the Offering Memorandum, except as may be required under federal or state securities or “blue sky” laws in connection with the granting of the Guarantees (with respect to such federal or state
securities or “blue sky” laws, as to which we render no opinion). 
 6. The security interest in favor of the Collateral Trustee
for the benefit of the holders of the Securities in the Ohio Guarantor’s rights in the UCC Collateral described in the Financing Statement is currently perfected by virtue of the filing of the Financing Statement in the Filing Office to the
extent a security interest in such UCC Collateral can be perfected under the OHUCC by the filing of a financing statement in the Filing Office. 

 EXHIBIT C-3 

OPINION FROM VIRGINIA COUNSEL 

Based upon the foregoing and subject to the qualifications, assumptions, limitations and exceptions set forth herein, we are of the opinion
that: 
 1. The Virginia Guarantor is a limited liability company validly existing under the laws of the Commonwealth of
Virginia with limited liability company power and authority necessary to own, lease and operate its properties and conduct its business as described in each of the Disclosure Package and the Final Memorandum. 

2. The Virginia Guarantor has all requisite limited liability company power and authority to execute, deliver and perform its
obligations under the Purchase Agreement, the Indenture, the Guarantees, the Collateral Documents and the Secured Party Consent, as applicable. 

3. The Purchase Agreement, the Indenture, the Guarantees, the Collateral Documents and the Secured Party Consent have been duly
authorized, executed and delivered, as applicable, by the Virginia Guarantor. 
 4. None of the offering, issuance and sale
of the Guarantees by the Virginia Guarantor, the consummation of the transactions contemplated in the Purchase Agreement, the Indenture, the Guarantees, the Collateral Documents and the Secured Party Consent by the Virginia Guarantor or the
execution and delivery of the Purchase Agreement, the Indenture, the Guarantees, the Collateral Documents and the Secured Party Consent, as applicable, by the Virginia Guarantor will violate (a) the Articles of Organization or the Operating
Agreement, (b) any applicable laws of the Commonwealth of Virginia or (c) any order or decree, known to us to be applicable to the Virginia Guarantor, of any court or any governmental agency or body of the Commonwealth of Virginia. 

5. No consent, approval, authorization or other action by, or filing with, any governmental agency or body of the Commonwealth
of Virginia or, to our knowledge, any court thereof, is required under any applicable laws of the Commonwealth of Virginia to be obtained or made by the Virginia Guarantor as of the date hereof for (a) the execution and delivery by the Virginia
Guarantor of the Purchase Agreement, the Indenture, the Guarantees, the Collateral Documents and the Secured Party Consent, as applicable, or (b) the consummation by the Virginia Guarantor of the transactions contemplated by the Purchase
Agreement, the Indenture, the Guarantees, the Collateral Documents or the Secured Party Consent. 
 6. Upon delivery of the
security certificates (as defined in § 8-102(a)(16) of the NY UCC) representing the portion of the Collateral (as defined in the Pledge Agreement) consisting of certificated securities (the
“Possessory Collateral”) to the Collateral Trustee in the State of New York, effectively endorsed to the Collateral Trustee, or in blank, the Collateral Trustee has a perfected security interest in such Possessory Collateral. 

 7. Upon the filing of the Financing Statement in the UCC records of the SCC
(the “Filing Office”), the Collateral Trustee has a perfected security interest in the UCC Collateral to the extent that a security interest therein may be perfected by the filing of a financing statement in the Filing Office (the
“Filing Collateral”).Exhibit 4.2

 

 

description of common
stock of

northern technologies
international corporation

 

The following summary description of the general terms and provisions of the common stock
of Northern Technologies International Corporation is a summary only and, therefore, is not complete and is subject to, and qualified
in its entirety by reference to, the terms and provisions of NTIC’s Restated Certificate of Incorporation, as amended, NTIC’s
Amended and Restated Bylaws, and the applicable provisions of the Delaware General Corporation Law. NTIC’s Restated Certificate
of Incorporation, as amended, and NTIC’s Amended and Restated Bylaws have previously been filed as exhibits with the SEC.

 

Common Stock

 

Authorized.  We currently have authority to issue up to 15,000,000 shares
of common stock, $0.02 par value per share. As of November 11, 2019, we had 9,090,413 shares of common stock outstanding. 
We may amend from time to time our Restated Certificate of Incorporation, as amended, to increase the number of authorized shares
of common stock.  Any such amendment would require the approval of the holders of a majority of the voting power of the shares
entitled to vote thereon.

 

Voting. For all matters submitted to a vote of stockholders, each holder of common
stock is entitled to one vote for each share registered in the holder’s name on our books. Our common stock does not have
cumulative voting rights. As a result, holders of a majority of our outstanding common stock can elect all of the directors who
are up for election in a particular year.

 

Dividends. If our board of directors declares a dividend, holders of common stock
will receive payments from our funds that are legally available to pay dividends. However, this dividend right is subject to any
preferential dividend rights we may grant to the persons who hold preferred stock, if any is outstanding.

 

Liquidation and Dissolution. If we are liquidated or dissolve, the holders of
our common stock will be entitled to share ratably in all the assets that remain after we pay our liabilities and any amounts we
may owe to the persons who hold preferred stock, if any is outstanding.

 

Fully Paid and Nonassessable.  All shares of our outstanding common
stock are fully paid and nonassessable.

 

Other Rights and Restrictions. Holders of our common stock do not have preemptive
or subscription rights, and they have no right to convert their common stock into any other securities. Our common stock is not
subject to redemption by us. The rights, preferences, and privileges of common stockholders are subject to the rights of the stockholders
of any series of preferred stock which we may designate in the future. Our Restated Certificate of Incorporation, as amended, and
Amended and Restated Bylaws do not restrict the ability of a holder of common stock to transfer his or her shares of common stock.

 

Listing. Our common stock is listed on the Nasdaq Global Market under the symbol
“NTIC.”

 

Transfer Agent and Registrar. The transfer agent and registrar for our common
stock is Broadridge Financial Services.

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