Billions of dollars in oil sands revenue rides on the approval of Northern Gateway Pipeline.
A report, drafted by Wood MacKenzie for the Alberta government, says that producers would lose $72 billion over nine years if the Enbridge project is rejected.
And while those in the oil patch would see their bottom line suffer, the Alberta government would also lose out on millions in offshore revenue royalties.
18 months of hearings on the Alberta to B.C. link begin next week.
The environmental review panel, charged with assessing the risks of the proposal , will allow time for 4,000 stakeholders to testify at the hearings, pushing back a final decision on the project until mid 2013.