TransCanada said Monday that… TransCanada Corp. said Monday that it had shut down its Keystone oil pipeline due to a possible leak in South Dakota. Workers found signs of oil on a small patch of ground about 4 miles from the company’s Freeman pump station after the incident was reported Saturday, the Canadian pipeline operator said in a statement. TransCanada said regulators have been notified and that the company is cooperating with those agencies on the investigation. It said no significant environmental impact has been observed. The pipeline will remain shut while the investigation is under way. TransCanada’s Keystone pipeline, which carries light and heavy crude oil from Hardisty, Alberta, represents about 15% of Western Canada’s crude export capacity, National Bank Financial Analyst Patrick Kenny said in a note. The pipeline delivers to a refinery and oil terminal […]