Suncor Energy, Petro-Canada Mail Letters of Transmittal and Election Forms to Registered Shareholders


CALGARY, July 2, 2009 - Suncor Energy Inc. ("Suncor") (TSX/SU; NYSE/SU) and Petro-Canada ("Petro-Canada") (TSX/PCA; NYSE/PCZ) announce the mailing today to their registered shareholders of the letters of transmittal and election forms and the related instructions for the proposed merger of Suncor Energy Inc. and Petro-Canada.

These documents outline the necessary documentation required to be sent to Computershare Investor Services Inc. (Computershare) by registered Suncor and Petro-Canada shareholders to receive, in relation to the proposed merger of the two companies via a plan of arrangement, the shares of the combined company to which they are entitled in exchange for their Suncor or Petro-Canada common shares (once the conditions to the merger have been satisfied and the merger has closed). Copies of this documentation will be available on the SEDAR website (www.sedar.com), the Securities Exchange Commission's (SEC's) website (www.sec.gov) and the joint merger site at suncorpetrocanada.com.

The letters of transmittal and election forms also provide eligible individual registered Suncor and Petro-Canada shareholders, resident in Canada, with the ability to make an election to have the exchange of their Suncor or Petro-Canada shares carried out in such a manner that may allow the shareholder to realize a capital gain or a capital loss for Canadian federal income tax purposes. The deadline for making such an election is 4:30 p.m. (Calgary time) on July 28, 2009.

Suncor and Petro-Canada have obtained the necessary shareholder and Court approvals required to meet certain conditions to the merger, but completion of the proposed merger remains conditional on the satisfaction of all regulatory and other customary conditions. It is expected that the merger will be completed in the third quarter of 2009. In the event that the merger is not completed, any share certificates sent to Computershare will be returned.

For further information on the Suncor and Petro-Canada merger go to
www.suncorpetro-canada.com.

ABOUT SUNCOR

Suncor Energy Inc. is an integrated energy company headquartered in Calgary, Alberta. Suncor's oil sands business, located near Fort McMurray, Alberta, extracts and upgrades oil sands and markets refinery feedstock and diesel fuel, while operations throughout western Canada produce natural gas. Suncor also operates a refining and marketing business which includes refining, retail, pipeline and distribution operations in Ontario, Canada and in Colorado and Wyoming in the United States. Suncor's common shares (symbol: SU) are listed on the Toronto and New York stock exchanges.

Suncor Energy (U.S.A.) Inc. is an authorized licensee of the Shell® and Phillips 66® brand and marks in the state of Colorado. Sunoco in Canada is separate and unrelated to Sunoco in the United States, which is owned by Sunoco, Inc. of Philadelphia.

For further information about Suncor, please visit www.suncor.com or call
Investor inquiries:
John Rogers,
(403) 269-8670

Media inquiries:
Shawn Davis,
(403) 920-8379

ABOUT PETRO-CANADA

Petro-Canada is one of Canada's largest oil and gas companies, operating in both the upstream and the downstream sectors of the industry in Canada and internationally. The Company creates value by responsibly developing energy resources and providing world class petroleum products and services. Petro- Canada is proud to be a National Partner to the Vancouver 2010 Olympic and Paralympic Winter Games. Petro-Canada's common shares trade on the Toronto Stock Exchange under the symbol PCA and on the New York Stock Exchange under the symbol PCZ.

For further information about Petro-Canada, please visit www.petro-canada.ca or
call:
Investor inquiries:
Ken Hall
(403) 296-7859

Media inquiries:
Victoria Barrington
(403) 296-8589

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