The $7.4-billion project would almost triple the flow of diluted bitumen and other products between Edmonton and Burnaby.
Ms. Notley also slammed Vancouver Mayor Gregor Robertson for his remarks earlier this week suggesting the oil and gas sector represents just a "tiny" part of the Canadian economy.
Advertisements feature messages like "Trans Mountain Pipeline means more money for roads, schools and hospitals" and "Trans Mountain Pipeline puts Canada first, making us less reliant on American markets".
Premier Rachel Notley unveiled the details of a $1.2-million campaign to garner support for the Trans Mountain pipeline expansion ahead of a looming deadline Kinder Morgan Inc. handed down to restore shareholder confidence.
"We must deploy this took with a cool hand, not an angry one", she said, adding Alberta will also be seeking full status in the B.C. court reference case.
The City of Burnaby intends to appeal the National Energy Board (NEB) decision to approve the Trans Mountain pipeline route through Burnaby to the Federal Court of Appeal within the next two weeks.
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On Tuesday, Mr. Robertson told Bloomberg that the proposed Trans Mountain pipeline expansion will never go ahead "based on the resistance on the ground".
Currently, the campaign's billboards can be seen at locations in Vancouver, Victoria, Kelowna, Kamloops, the west Kootenays, and the airports in Abbotsford and Nanaimo.
Ms. Notley said his remarks demonstrate "a tremendous lack of knowledge" about the country's wealth generators.
Horgan wants the B.C. Court of Appeal to rule on whether the province has the authority to limit an increase of bitumen shipments through British Columbia.
She was also asked whether her party would consider splitting from the federal NDP, given the difference in opinion on the project. On Wednesday, Kinder Morgan shareholders voted in favour of a non-binding proposal that would require audits of the company's environmental and legal risks. Trans Mountain argued that the bylaws were unconstitutional because they conflicted with the federal approval and the NEB Act.