Federal wildlife committee concluded the project could hurt a beluga whale habitat.
A Senate vote is scheduled for Nov. 18, but the project could still be vetoed by President Barack Obama.
Opposition is mounting from environmentalists and politicians in the NDP’s home base of Quebec.
The approval subject to conditions, including Enbridge undertaking activities involving pipeline integrity, emergency response.
They would enable his company Kitimat Clean Ltd. to secure loans at a lower cost.