CALGARY, ALBERTA - Suncor Energy Inc. today released its 2003 Report on Sustainability, the first such publication by a Canadian company to be prepared in accordance with the 2002 Sustainability Reporting Guidelines of the Global Reporting Initiative (GRI), which is setting new international standards for tracking sustainability efforts.

The 2003 report continues the story of the Suncor's journey to becoming a sustainable energy company and describes its environmental, economic and social performance during 2001 and 2002. While several of Suncor's previous reports, released every other year since 1995, followed the GRI guidelines, this is the first time Suncor has provided information in all the requirements areas of the GRI.

"As well as reflecting Suncor's commitment to being honest and open, this gives us a benchmark opportunity from which to pursue a course of continuous improvement," says Rick George, president and chief executive officer of Suncor. "Sustainability is about earning stakeholder consent to operate and grow our business. By communicating candidly, we are more likely to find mutually beneficial solutions to difficult challenges."

Suncor's report was audited by PricewaterhouseCoopers LLP to verify selected performance indicators. Copies of the 2003 Report can be obtained by calling 1-800-558-9071 or by e-mail to info@suncor.com. The complete report is also available on Suncor's website at www.suncor.com.

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.

Sunoco in Canada is separate and unrelated to Sunoco in the United States, which is owned by Sunoco, Inc. of Philadelphia.

Suncor Energy Inc.

Suncor Energy Inc.

Suncor Energy is Canada's leading integrated energy company. Suncor's operations include oil sands development, production and upgrading; offshore oil and gas; petroleum refining in Canada and the U.S.; and the company's Petro-Canada retail and wholesale distribution networks (including Canada's Electric Highway™, a coast-to-coast network of fast-charging electric vehicle stations). Suncor is developing petroleum resources while advancing the transition to a low-emissions future through investment in power, renewable fuels and hydrogen. Suncor also conducts energy trading activities focused principally on the marketing and trading of crude oil, natural gas, byproducts, refined products and power. Suncor has been recognized for its performance and transparent reporting on the Dow Jones Sustainability index, FTSE4Good and CDP. Suncor is also listed on the UN Global Compact 100 stock index. Suncor's common shares (symbol: SU) are listed on the Toronto Stock Exchange and the New York Stock Exchange.

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