As of March 29, 2019 (the “Effective Date”), Vistra Operations Company LLC (“Vistra Operations” or “Borrower”), an indirect, wholly owned subsidiary
of Vistra Energy Corp. (the “Company”), entered into an amendment (the “Credit Agreement Amendment”) to that certain Credit Agreement, dated as of
October 3, 2016 (as amended, supplemented or otherwise modified from time to time, the “Vistra Operations Credit Agreement”), among Vistra Operations,
as Borrower, Vistra Intermediate Company LLC (“Vistra Intermediate”), as Holdings, the guarantors party thereto, Credit Suisse AG, Cayman Island
Branch (“Credit Suisse”), as Administrative and Collateral Agent, Bank of Montreal, Chicago Branch, as a new Revolving Loan Lender, Revolving Letter
of Credit Issuer and Joint Lead Arranger (as each term is defined in the Vistra Operations Credit Agreement) (the “2019 New Revolving Loan Lender”),
and the other parties named therein.
In connection with the Credit Agreement Amendment, the Borrower established New Revolving Credit Commitments
(as defined in the Vistra Operations Credit Agreement), whereby as of the Effective Date, (i) the aggregate amount of Revolving Credit Commitments (as
defined in the Vistra Operations Credit Agreement) of all lenders is increased to $2,675,000,000 from $2,500,000,000 and (ii) the Revolving Letter of
Credit Commitment (as defined in the Vistra Operations Credit Agreement) is increased to $2,350,000,000 from $2,300,000,000