No topic has captured the attention of Tyee readers more than the Kinder Morgan pipeline project - so much so that seven of the 10 most read articles this year were on the Trans Mountain expansion.
In a written decision, the court said the energy board's review was so flawed that the federal government could not rely on it to approve the pipeline.
But many indigenous people see the 620 miles of new pipeline as a threat to their lands, echoing concerns raised by Native Americans about the Keystone XL project in the U.S. Many in Canada say it also raises broader environmental concerns by enabling increased development of the carbon-heavy oil sands.
The court ruled the National Energy Board's review of the project was flawed because it failed to consider impact on marine life.
Executive Director of the Georgia Strait Alliance Christianne Wilhelmson says the Trudeau Liberals have been shamed.
It's a stunning victory for Indigenous groups and environmentalists opposed to the project, which is created to almost triple the amount of tar sands transported from Alberta to the coast of British Columbia.
Shortly after the loss in court, Canada got one step closer to purchasing the existing pipeline and expansion project, from Texas-based Kinder Morgan.
"Thankfully, the court has stepped in where Canada has failed to protect and respect our rights and our water", Coldwater Indian Band Chief Lee Spahan said in a statement.
"Four or five hundred tanker crossings a year will not happen, the risk of a diluted bitumen spill will not increase, it's significant to the orcas, it does not solve all the other problems", says Wilhelmson.
The court combined into one case almost two dozen lawsuits calling for the energy board's review to be overturned.
"The government made two errors that motivated the Federal Court of Appeals' decision to revoke construction approval for Trans Mountain".
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The outcome was not in question as Kinder Morgan Inc. retained about 70 per cent of the shares after spinning off its Canadian assets in a $1.75-billion initial public offering in May of 2017.
He is calling on the federal government to do what it can to complete the project saying the province is losing big money without the expanded pipeline.
The scheme had been a crucial test for Trudeau and his government, who swept into office in 2015 on promises of striking a balance between economic growth, environmental concerns and repairing the country's fraught relationship with Indigenous peoples.
He says the government is reviewing the Federal Appeal Court ruling carefully, but the judgment is long and he doesn't have a response yet.
Today's appeals court decision will be a blow to Mr Trudeau who has portrayed himself as a friend to First Nation people and tried to build national support for a carbon emissions reduction plan, even while backing Trans Mountain to support the oil industry. "We can't stand for it".
"It's at this point we would encourage the federal government to use all of the tools at their disposal to ensure that this nation-building project, this ever-so-important project can start and continue construction to its completion".
Khelsilem, councillor and spokesperson for Squamish Nation in B.C., a plaintiff in this case, said many are feeling "elation and happiness and joy" with today's ruling.
While the project could allow Alberta to get its bitumen to markets in Asia and reduce its reliance on the USA market, there has been opposition over the potential for oil spills and the impact that a dramatic rise in tanker traffic could have on the region's southern resident killer whales, a population already on the knife edge of extinction.
"We understand that climate change is real, it's a major issue for us", he said.
October 26, 2017: Kinder Morgan Canada asks NEB to allow work to begin despite a failure to obtain municipal permits from the City of Burnaby. "I think Kinder Morgan is just glad to be out of Canada on that project". Earlier in August, the Supreme Court of Canada dismissed an application to overturn a lower court decision by the City of Burnaby near Vancouver, where the pipe would terminate.