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Enbridge Inc’s 796,000 barrel per day Line 4, which carries crude oil from Edmonton, Alberta, to Clearbrook, MN, shutdown last Tuesday after a power outage, a company spokesman said.

The power outage stemmed from a failure on SaskPower’s transmission line feeding two pump stations in Saskatchewan, and Enbridge was working toward a Wednesday night start-up.

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Line 4 transports heavy crude and is part of the Enbridge Mainline system which carries the bulk of Canadian crude exports to the United States.

There was a problem affecting an electricity transmission line to a pair of pump stations east of Regina in southern Saskatchewan, company spokesman Graham White said.

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Saskatchewan Power Corp. which operates the transmission line, said several power poles connected to the Enbridge facilities ended up damaged by strong winds and icy conditions.

Line 4 is one of three major pipes that extends for 1,098 miles from Edmonton, Alberta to a major terminal in Superior, WI.

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