CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We have issued our report dated September 11, 2007 with respect to the financial statements of DTE Gas and Oil Company appearing in the Current Report on Form 8-K/A (Amendment No. 1) of Atlas Energy Resources, LLC filed September 12, 2007, which is incorporated by reference in Post-Effective Amendment No. 2 to this Registration Statement. We consent to the incorporation by reference in the Registration Statement of the aforementioned report and to the use of our name as it appears under the caption “Experts.”

/s/ GRANT THORNTON LLP

Oklahoma City, Oklahoma
March 11, 2009