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

CALGARY, July 3 /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 2.1242 to 2.14316. Such increase
will be effective on July 16, 2007.

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

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10 day
weighted
average
trading
price of Effective
AET.UN date of
Record date (prior the Exchange
of ARC ARC Energy to the Increase increase ratio
Energy Opening Trust end of in in as of
Trust exchange distribution the exchange exchange effective
distribution ratio per unit month) ratio(xx) ratio date
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June 30, 2.12420 $0.20 $22.4112 0.01896 July 16, 2.14316
2007 2007
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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