New drilling problems revealed Jan. 29 on Trans Mountain pipeline expansion in Alberta and British Columbia could cause added startup delay, two weeks after it finally won critical variance.

Owner TC Energy announced partial reopening Dec. 14 of the Canada-to-U.S crude oil line but has not said what caused the pipe rupture or when cleanup of the spill into a Kansas creek would be completed.

The demise of TransCanada Corp.’s  $12.5-billion Energy East pipeline has put another dent in Canada’s ambitious infrastructure plans, but the void may get filled with other large, albeit controversial, energy projects.

G. John Hickenlooper has ordered that all abandoned oil and gas pipelines be marked, cut 3 ft below the surface and capped.