ARC Resources Ltd./ARC Energy Trust Announce the August 2009 increase to the ARX Exchangeable Shares Exchange Ratio

    CALGARY, Aug. 31 /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 2.66426 to 2.67944. Such increase
will be effective on September 15, 2009.
    The following are the details on the calculation of the exchange ratio:

                                     10 day
    Record                          weighted             Effective
    date of                         average                 date
      ARC              ARC Energy   trading                of the   Exchange
    Energy               Trust      price of    Increase  increase  ratio as
     Trust    Opening   distrib-  AET.UN (prior    in        in        of
    distrib-  exchange   ution     to the end   exchange  exchange  effective
     ution     ratio    per unit  of the month) ratio(xx)   ratio     date
    August 31,                                            September
     2009      2.66426   $0.10     $17.5479      0.01518   15, 2009  2.67944

    (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

    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, Chief Executive Officer %SEDAR: 00001245E %CIK: 0001029509

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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