The Liberal government expects to get $500 million a year out of the expanded Trans Mountain pipeline, and promises to spend it all on cleaner sources of energy and projects that pull carbon out of the atmosphere.

Finance Minister Bill Morneau told The Canadian Press in an interview this week that the expanded pipeline is not fodder for negotiating with other parties in the minority government. Rather, he said, it is a crucial piece of the puzzle of financing Canada's transition to a clean energy economy.

"We purchased it for a reason," said Morneau. "We now see how it can help us accelerate our clean energy transition by putting any revenues that we get from it into a transition to clean energy. We think that is the best way we can move forward in our current context."

The Liberal government bought the existing pipeline for $4.5 billion in 2018, in a bid to overcome the opposition of the B.C. government to the expansion.

Federally, the two parties with the most in common with the Liberals on climate change both think the expansion should be cancelled. NDP Leader Jagmeet Singh, whose party has enough seats to support the Liberals through any confidence votes, wants tougher climate action but has stopped short of using the pipeline as a line in the sand.

He has suggested that ship has effectively sailed.

Morneau said construction on the pipeline is underway and the decision to go forward has been made, which means there is really no way to use it as a bargaining chip in the minority government.

"My expectation is that we have much common ground between the other parties that have been elected to the next Parliament," said Morneau.

"We will be seeking consensus on how we can move forward on that common ground. This project we've already moved forward on. It's one that we've said that we're moving forward on, we've actually already gone through that process."

New Federal Court challenge underway

Construction on the expansion is supposed to be done by the middle of 2022. The Liberal platform forecasted taking revenues of $125 million from Trans Mountain Canada in 2021-22 and then $500 million in each of the next two years.

Eventually, Morneau said, the plan is to sell it back to the private sector and all of the revenues from the sale will then go to clean energy development and other climate change action projects.

The one specific promise the Liberals made that they connected to pipeline revenues was a $300-million annual fund for natural climate solutions including tree planting, as well as conservation and restoration of forests, grasslands, agricultural lands and coastal areas.

Construction on the pipeline was halted in September 2018, after the Federal Court of Appeal overturned federal approval, citing insufficient environmental and Indigenous consultations.

Cabinet undertook new rounds of both and approved the expansion a second time in June.

Construction on the pipeline then resumed in August, starting with work on the marine terminals in British Columbia and pumping stations in Alberta. The first 50 kilometres of actual pipeline will start being laid in the Edmonton area shortly, a spokesperson for Trans Mountain Canada said Wednesday.

Thus far, more than 2,200 workers have been hired.

The pipeline runs from a terminal east of Edmonton to a marine terminal in Burnaby, B.C. The expansion will see a second pipeline built roughly parallel to the first that can carry almost twice as much crude oil every day.

There is however a new federal court challenge underway from Indigenous communities who argued the secondary consultation process undertaken by the government earlier this year was a sham.