Atlas Energy, L.P. (NYSE: ATLS) (“Atlas Energy” or “ATLS”) announced today the completion of its previously announced acquisition of approximately 45 Bcf of natural gas proved reserves in the Arkoma Basin in southeastern Oklahoma from EP Energy E&P Company, L.P (“EP Energy”) for $67 million, as adjusted pursuant to the purchase agreement. In addition, ATLS’ E&P subsidiary, Atlas Resource Partners, L.P. (NYSE: ARP) completed its acquisition of natural gas assets from EP Energy for $733 million, as adjusted pursuant to the purchase agreement. In conjunction with the closing, ATLS purchased approximately 3.75 million Class C ARP preferred units for approximately $87 million. ATLS funded the acquisition of the Arkoma assets and the purchase of the ARP preferred units with the issuance of a 6-year $240 million senior secured term loan credit facility. The term loan was priced at LIBOR + 550 basis points with a 1% LIBOR floor. Deutsche Bank Securities and Wells Fargo acted as joint lead arrangers and joint book-runners for the syndication of the term loan facility. Atlas Energy, L.P. (NYSE: ATLS) is a master limited partnership which owns all of the general partner Class A units and incentive distribution rights and an approximate 37% limited partner interest in its upstream oil & gas subsidiary, Atlas Resource Partners, L.P. Additionally, Atlas Energy owns and operates the general partner of its midstream oil & gas subsidiary, Atlas Pipeline Partners, L.P., through all of the general partner interest, all the incentive distribution rights and an approximate 6% limited partner interest. For more information, please visit our website at www.atlasenergy.com, or contact Investor Relations at InvestorRelations@atlasenergy.com. Atlas Resource Partners, L.P. (NYSE: ARP) is an exploration & production master limited partnership which owns an interest in over 12,000 producing natural gas and oil wells, located primarily in Appalachia, the Barnett Shale (TX), the Raton Basin (NM) and Black Warrior Basin (AL). ARP is also the largest sponsor of natural gas and oil investment partnerships in the U.S. For more information, please visit our website at www.atlasresourcepartners.com, or contact Investor Relations at InvestorRelations@atlasenergy.com. Cautionary Note Regarding Forward-Looking Statements This document contains forward-looking statements that involve a number of assumptions, risks and uncertainties that could cause actual results to differ materially from those contained in the forward-looking statements. ATLS cautions readers that any forward-looking information is not a guarantee of future performance. Such forward-looking statements include, but are not limited to, statements about future financial and operating results, resource potential, ATLS’ plans, objectives, expectations and intentions and other statements that are not historical facts. Risks, assumptions and uncertainties that could cause actual results to materially differ from the forward-looking statements include, but are not limited to, those associated with general economic and business conditions; ATLS’s and ARP’s ability to realize the anticipated benefits of the acquisitions; changes in commodity prices; changes in the costs and results of drilling operations; uncertainties about estimates of reserves and resource potential; inability to obtain capital needed for operations; ATLS’ level of indebtedness; changes in government environmental policies and other environmental risks; the availability of drilling equipment and the timing of production; tax consequences of business transactions; and other risks, assumptions and uncertainties detailed from time to time in ATLS’, ARP’s and APL’s reports filed with the U.S. Securities and Exchange Commission, including quarterly reports on Form 10-Q, current reports on Form 8-K and annual reports on Form 10-K. Forward-looking statements speak only as of the date hereof, and ATLS assumes no obligation to update such statements, except as may be required by applicable law.