ARC Resources Ltd. / ARC Energy Trust Announce the July 2010 increase to the
ARX Exchangeable Shares Exchange Ratio

CALGARY, July 30 /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 2.81171 to 2.82551. Such increase will be effective on August 16, 2010.

The following are the details on the calculation of the exchange ratio:

    
    -------------------------------------------------------------------------
                                     10 day
                                   weighted
    Record                          average             Effective
    date                     ARC    trading                  date
    of ARC                Energy   price of                of the   Exchange
    Energy                 Trust     AET.UN   Increase   increase   ratio as
    Trust      Opening    distri- (prior to         in         in         of
    distri-   exchange    bution  the end of  exchange   exchange  effective
    bution       ratio  per unit  the month)  ratio(xx)     ratio       date
    -------------------------------------------------------------------------
    July 30,                                            August 16,
     2010      2.81171     $0.10   $20.3679    0.01380       2010    2.82551
    -------------------------------------------------------------------------

    (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 www.computershare.com.

    
    ARC RESOURCES LTD.
    John P. Dielwart,
    Chief Executive Officer
    

%SEDAR: 00015954E %CIK: 0001029509

For further information: about ARC Energy Trust, please visit our website www.arcenergytrust.com or contact: Investor Relations, E-mail: [email protected], Telephone: [phone], Fax: [phone], Toll Free 1-888-272-4900, ARC Resources Ltd., 1200, 308 - 4th Avenue S.W., Calgary, AB, T2P 0H7