Atlas Energy Resources, LLC to Release Financial Results for Second Quarter 2009 and Host Conference Call

Atlas Energy Resources, LLC (NYSE: ATN) announced today that it will release its results for the second quarter 2009 on Monday, August 10, 2009 after market hours, and invites investors and other interested parties to listen to the live webcast of its quarterly conference call on Tuesday, August 11, 2009, at 9:00 a.m. Eastern Time.

This call is being webcast live and can be accessed by investors and other interested parties from the Investor Relations section of Atlas Energy’s websites at www.atlasenergyresources.com. For those unavailable to listen to the live broadcast, the replay of the webcast will be available following the live call on the Atlas Energy Resources website and telephonically beginning at 11:00 a.m. ET on August 11, 2009 by dialing 888-286-8010, passcode: 11875571.

Atlas Energy Resources, LLC develops and produces domestic natural gas and to a lesser extent, oil. Atlas Energy is one of the largest independent energy producers in the Appalachian Basin and Michigan’s Antrim Shale. The Company sponsors and manages tax-advantaged investment partnerships, in which it co-invests, to finance the exploration and development of the Company’s acreage in the Appalachian Basin. Atlas Energy is active principally in Pennsylvania, Michigan, Tennessee and Indiana. For more information, visit Atlas Energy’s website at www.atlasenergyresources.com or contact investor relations at [e-mail].