ARC Resources Ltd./ARC Energy Trust Announce the August 2007 increase to the ARX Exchangeable Shares Exchange Ratio

    CALGARY, Aug. 1 /CNW/ - (AET.UN and ARX - TSX) ARC Resources Ltd. along
with ARC Energy Trust announces the increase to the exchange ratio of the
exchangeable shares of the corporation from 2.14316 to 2.16283. Such increase
will be effective on August 15, 2007.
    The following are the details on the calculation of the exchange ratio:

    Record date   Opening   ARC      10 day    Increase  Effective  Exchange
    of ARC        exchange  Energy   weighted  in        date of    ratio
    Energy Trust  ratio     Trust    average   exchange  the        as of
    distribution            distri-  trading   ratio     increase   effective
                            bution   price of  (xx)      in         date
                            per      AET.UN              exchange
                            unit     (prior to           ratio
                                     the end
                                     of the
    July 31,      2.14316  $0.20    $21.7903   0.01967   August 15, 2.16283
    2007                                                 2007

    (xx)   The increase in the exchange ratio is calculated by dividing the
           ARC Energy Trust distribution per unit by the 10 day weighted
           average trading price of AET.UN and multiplying by the opening
           exchange ratio.

    A holder of ARC Resources Ltd. exchangeable shares can exchange all or a
portion of their holdings at any time by giving notice to their investment
advisor or Computershare Investor Services at its principal transfer office in
Suite 600, 530 - 8th Avenue SW, Calgary, Alberta, T2P 3S8, their telephone
number is 1-800-564-6253 and their website is

    ARC RE

SOURCES LTD. John P. Dielwart, President and Chief Executive Officer

For further information:

For further information: about ARC Energy Trust, please visit our
website or contact: Investor Relations, E-mail:, Telephone: (403) 503-8600, Fax: (403) 509-6417, Toll Free
1-888-272-4900, ARC Resources Ltd., 2100, 440 - 2nd Avenue S.W., Calgary, AB,
T2P 5E9

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