Suncor Energy Inc.

Suncor Energy Inc.

21 mars 2007 23h59 HE

Suncor Energy reports $600 million debt issue

All financial figures are in Canadian dollars.

Calgary, Alberta (March 21, 2007) — Suncor Energy Inc. reports that it has arranged for the issuance of $600 million in principal amount of Series 4 Medium Term Notes maturing on March 26, 2037. The notes will have a coupon of 5.39% and be priced at $99.72 to yield 5.409%. The net proceeds from the sale of the notes will be used to repay commercial paper borrowings. Closing is scheduled for March 26, 2007.

These debt securities are rated "A-" by Standard & Poor's Rating Service (S&P) and "A (low)" by DBRS Limited.

The offering was made in Canada under Suncor's short form base shelf prospectus dated February 12, 2007. BMO Capital Markets Inc., CIBC World Markets Inc., RBC Capital Markets Inc., Scotia Capital Inc., and TD Securities Inc. acted as agents for the offering.

The Series 4 Medium Term Notes have not been registered under U.S. securities laws and may not be offered, sold or delivered in the United States.

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 operates a refining and marketing business in Ontario with retail distribution under the Sunoco brand. U.S.A. downstream assets include pipeline and refining operations in Colorado and Wyoming and retail sales in the Denver area under the Phillips 66® brand. Suncor's common shares (symbol: SU) are listed on the Toronto and New York stock exchanges.

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For further information, contact:

Brad Bellows
(403) 269-8717