President Barack Obama's decision yesterday to reject a permit for TransCanada Corp.'s Keystone XL oil pipeline may prompt Canada to turn to China for oil exports.

Prime Minister Stephen Harper, in a telephone call yesterday, told Obama "Canada will continue to work to diversify its energy exports," according to details provided by Harper's office. Canadian Natural Resource Minister Joe Oliver said relying less on the U.S. would help strengthen the country's "financial security."

The "decision by the Obama administration underlines the importance of diversifying and expanding our markets, including the growing Asian market," Oliver told reporters in Ottawa.

Currently, 99 percent of Canada's crude exports go to the U.S., a figure that Harper wants to reduce in his bid to make Canada a "superpower" in global energy markets.

Canada accounts for more than 90 percent of all proven reserves outside the Organization of Petroleum Exporting Countries, according to data compiled in the BP Statistical Review of World Energy. Most of Canada's crude is produced from oil-sands deposits in the landlocked province of Alberta, where output is expected to double over the next eight years, according to the Canadian Association of Petroleum Producers.

"I am sure that if the oil sands production is not used in the United States, they will be used in other countries," Fatih Birol, chief economist at the International Energy Agency, said in an interview before a speech at Imperial College in London today.