Atlas Energy Resources, LLC Announces Public Offering of Senior Notes

PITTSBURGH--(Business Wire)--
Atlas Energy Resources, LLC (NYSE: ATN) ("Atlas Energy" or "the Company")
announced today that it has commenced an underwritten public offering of $150
million aggregate principal amount of senior unsecured notes due 2017. Atlas
Energy intends to use the net proceeds from this offering to reduce outstanding
borrowings under its revolving credit facility.

J.P. Morgan, Wells Fargo Securities, LLC, Banc of America Securities LLC and RBC
Capital Markets Corporation are acting as joint book-running managers for the
offering. The offering is being made pursuant to an effective shelf registration
statement. The offering may be made only by means of a prospectus supplement and
the accompanying prospectus, copies of which may be obtained by sending a
request to:

J.P. Morgan Securities Inc.
270 Park Avenue, Floor 5
New York, NY 10017
Telephone: (212) 270-1477

Wells Fargo Securities, LLC
Attn: High Yield Syndicate - Deana Deep
301 South College St. 0608
Charlotte, NC 28202
Telephone: (704) 715-0540

Banc of America Securities LLC
Attn: Prospectus Department
100 West 33rd Street, 3rd Floor
New York, NY 10001
Telephone: (800) 294-1322

RBC Capital Markets Corporation
Three World Financial Center
200 Vesey Street, 9th Floor
New York, NY 10281
Telephone: (212) 618-2207

An electronic copy of the prospectus and preliminary prospectus supplement is
available from the Securities and Exchange Commission`s website at
http://www.sec.gov.

This press release shall not constitute an offer to sell or the solicitation of
an offer to buy the securities described herein, nor shall there be any sale of
these securities in any state or jurisdiction in which such an offer,
solicitation or sale would be unlawful prior to registration or qualification
under the securities laws of any such jurisdiction.

Atlas Energy Resources, LLC is one of the largest independent natural gas
producers in the Appalachian and Michigan Basins. The Company is also the
country`s largest sponsor and manager of tax-advantaged energy investment
partnerships that finance the exploration and development of the Company`s
acreage.

Atlas America, Inc. owns approximately 48% of the Class B common unit interests
and all of the management incentive interests in Atlas Energy Resources, LLC.
Atlas America, Inc. also owns 1.1 million common units in Atlas Pipeline
Partners, L.P. (NYSE: APL) and a 64% interest in Atlas Pipeline Holdings, L.P.
(NYSE: AHD), a limited partnership which owns the general partner interest, all
the incentive distribution rights and 5.8 million common units of Atlas Pipeline
Partners, L.P.

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. Atlas Energy
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 or assumptions regarding whether the proposed merger between
Atlas America and Atlas Energy will occur, statements about the benefits of such
proposed merger, including future financial and operating results, the combined
company`s 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; well production and acreage potential; changes in commodity
price; the possibility that the proposed merger might not occur; inability to
obtain capital needed for operations; the level of indebtedness; changes in
government environmental policies; tax consequences of business transactions;
and other risks, assumptions and uncertainties detailed from time to time in
either company`s reports filed with the U.S. Securities and Exchange Commission
(the "SEC"), including each company`s report on Form 10-K for the year ended
December 31, 2008. There can be no assurance that the transactions described in
this document will be consummated. Forward-looking statements speak only as of
the date hereof, and each company assumes no obligation to update such
statements.

Atlas Energy Resources, LLC
Brian J. Begley
Vice President - Investor Relations
877-280-2857
Fax: 215-553-8455

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