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.

Oil pipelines dominated the energy news on Nov. 29, when Canada’s government approved one of two controversial pipelines from Alberta’s oil sands to the west coast, rejected a second and gave a pass to a third, running south to the U.S.