F1This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein.
F2The Common Units are held directly by Bronco Infrastructure and Enogex. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex.
F3The price reported in Column 4 is a weighted average price. These Common Units were sold in multiple transactions at prices ranging from $14.35 to $14.61, inclusive. The reporting person undertakes to provide to Enable Midstream Partners, LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Units sold at each separate price within the ranges set forth in footnote (3) to this Form 4.