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CALGARY — The dramatic rise of U.S. crude oil and natural gas production is disrupting even long-established trade flows inside Canada, as Alberta producers are increasingly finding themselves competing for — and losing — market share to American petroleum suppliers, even in their home province.

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Enbridge Inc. said it has not signed binding contracts with oil shippers for its Northern Gateway pipeline and that it cannot predict when it may secure commercial support for the project

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U.S. exports of crude — primarily to Canada — are at their highest level in 15 years, according to U.S. government data, and a tide of shale gas from Pennsylvania, Ohio and elsewhere is fast displacing Western supplies in Eastern Canada.

The sudden influx, although still dwarfed by Canada’s crude exports to the U.S., has added urgency to the Alberta-based oil sector’s hunt for new markets as it seeks to cut dependence on a lone export market that now finds itself increasingly flush with domestic petroleum. But it has also come as a boon for energy-intensive industries from chemical-making to refining, as companies north of the border seek to tap cheap energy unlocked by advances in drilling and hydraulic fracturing.