Tom Mulcair predicts the Northern Gateway pipeline will never be built, even if it passes environmental muster.
Indeed, the NDP leader says the controversial project should have been vetoed outright, without wasting public money on an environmental assessment.
The National Energy Board is poised to release Thursday the results of its environmental review of Enbridge's proposed $5.5-billion pipeline to carry Alberta oilsands bitumen to the northwest Pacific Coast for export to Asia.
Mulcair says the project is a non-starter because it would require supertanker traffic through British Columbia's Douglas Channel.
The NDP is also adamantly opposed to the proposed Keystone XL pipeline to carry oilsands bitumen to the U.S. Gulf Coast.
Mulcair says he recognizes the oilsands are the motor of Canada's economy and there has to be a way to get the product to overseas markets; but he prefers the idea of a west-east pipeline, provided it is supported by a thorough, credible environmental assessment.
In the case of Northern Gateway, however, Mulcair said no assessment can make it palatable.
"Allowing supertankers into the Douglas Channel is madness and it should not take place," Mulcair told a news conference Wednesday.
One need not look further than the devastating 1989 Exxon Valdez oil spill off the coast of Alaska, the environmental impact of which is still being felt decades later, to understand why supertanker traffic in the Douglas Channel makes no sense, Mulcair added.
"It's a non-starter. We should never even have sent this thing to a study."
Mulcair said the NDP will not budge in its opposition to the proposal, whether or not it wins NEB approval.