ARC Resources Ltd./ARC Energy Trust Announce the July 2008 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 2.38563 to 2.40779. Such increase
will be effective on August 15, 2008.
The following are the details on the calculation of the exchange ratio:

<<
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10 day
weighted
average Effective
Record trading date of
date of ARC Energy price of the Exchange
ARC Energy Trust AET.UN increase ratio
Trust Opening distrib- (prior to Increase in as of
distrib- exchange ution the end of in exchange exchange effective
ution ratio per unit the month) ratio(xx) ratio date
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July 31, August 15,
2008 2.38563 $0.28 $30.1416 0.02216 2008 2.40779
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(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,
President and Chief Executive Officer