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

Oct 2, 2007

CALGARY, Oct. 2 /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 2.18448 to 2.20555. Such increase
will be effective on October 15, 2007.
The following are the details on the calculation of the exchange ratio:

<<
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Record Opening ARC 10 day Increase Effective Exchange
date of exchange Energy weighted in date of ratio
ARC Energy ratio Trust average exchange the as of
Trust distri- trading ratio increase effective
distribution bution price of (xx) in date
per AET.UN exchange
Unit (prior to ratio
the end
of the
month)
-------------------------------------------------------------------------
September 30, 2.18448 $0.20 $20.7380 0.02107 October 15, 2.20555
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

For further information: about ARC Energy Trust, please visit our website www.arcenergytrust.com or contact: Investor Relations, E-mail: ir@arcresources.com, 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