Canada's energy regulator will tell the federal government this week whether it still thinks the Trans Mountain pipeline should be expanded, but cabinet's final say on the project's future is still several months away.

If Trans Mountain’s shippers don’t pay for the purchase of the legacy line in tolls charged to them, Canadian taxpayers will.

The Trudeau government faces a significant risk of having overpaid for the Trans Mountain pipeline project, having shelled out "at the higher end" of its value, leaving virtually no room for an expected construction delay, possible cost overruns or other factors, says Canada's parliamentary watchdog.

A pair of experts on global warming have thrown their support behind a new legal motion urging the National Energy Board should consider all climate-related impacts from the proposed Trans Mountain oil pipeline and tanker expansion in its review of the project.