News Release

FOR IMMEDIATE RELEASE

Suncor Energy reports oil sands hydrogen unit outage

Calgary, Alberta (Aug. 20, 2010) — Suncor Energy Inc. reports that one of its hydrogen reformer units at its oil sands base plant in Fort McMurray, Alberta, experienced an outage. An assessment is currently underway to determine the cause of the outage and a schedule to return the unit to operation.

Although the production mix of low- and high-sulphur products will be impacted while the unit is undergoing repairs, oil sands production continues to be more than 300,000 barrels per day.

Certain statements in this news release constitute “forward-looking statements” within the meaning of the United States Private Securities Litigation Reform Act of 1995 and “forward-looking information” within the meaning of applicable Canadian securities legislation (collectively, “forward-looking statements”). All forward-looking statements are based on Suncor’s current expectations, estimates, projections, beliefs and assumptions based on information available at the time the statement was made and in light of Suncor’s experience and its perception of historical trends.

Some of the forward-looking statements may be identified by words like “expected,” “targets,” “schedule,” and similar expressions. In addition, all other statements that address expectations or projections about the future, including statements about our strategy for growth, costs, schedules, production volumes, operating and financial results and expected impact of future commitments, are forward-looking statements. Forward-looking statements in this news release include references to the impact on the production mix of low- and high-sulphur products while the unit is undergoing repair and production rates of more than 300,000 barrels per day. Forward-looking statements are not guarantees of future performance and involve a number of risks and uncertainties, some that are similar to other oil and gas companies and some that are unique to our company. Suncor’s actual results may differ materially from those expressed or implied by our forward-looking statements and you are cautioned not to place undue reliance on them.

Suncor’s Earnings Release, Quarterly Report and Management’s Discussion & Analysis for the second quarter of 2010 and its most recently filed Annual Information Form/Form 40-F, Annual Report to Shareholders and other documents it files from time to time with securities regulatory authorities describe the risks, uncertainties, material assumptions and other factors that could influence actual results and such factors are incorporated herein by reference. Copies of these documents are available without charge from Suncor at 150 6th Avenue S.W., Calgary, Alberta T2P 3Y7, by calling 1-800-558-9071, or by email request to info@suncor.com or by referring to the company’s profile on SEDAR at www.sedar.com or EDGAR at www.sec.gov. Except as required by applicable securities laws, Suncor disclaims any intention or obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Suncor Energy Inc. is Canada’s premier integrated energy company. Suncor’s operations include oil sands development and upgrading, conventional and offshore oil and gas production, petroleum refining, and product marketing under the Petro-Canada brand. While working to responsibly develop petroleum resources, Suncor is also developing a growing renewable energy portfolio. Suncor’s common shares (symbol: SU) are listed on the Toronto and New York stock exchanges

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For more information about Suncor Energy Inc. please visit our web site at www.suncor.com .

	Suncor Energy Inc.
	P.O. Box 38, 112 4 Avenue S.W., Calgary, Alberta T2P 2V5
	Website: www.suncor.com

Investor inquiries:	John Rogers 403-296-6622
Media inquiries:	403-920-8332