A Globe and Mail investigation reports Alberta separatist figures proposed giving the U.S. access to fresh water and oil royalties in exchange for help with independence. Another separatist leader disputes it, and the investigation also reveals a Calgary meeting with Republican operatives from Michigan.
I looked it up. It is loosely write as you said, however that swings both ways.
There was something else I did notice. The provinces have to agree to the constitutional amendment required to allow Alberta to separate. All it takes is one Premier to say that the referendums were not done democratically. They would have to go through everything that was done in bad faith in front of parliament and be willing to pay the massive political cost of doing so.
The thing that is actually impossible is getting the First Nations to agree to leave Canada. I would guess they have claim to more than 75% of the land, leaving Alberta to be a fraction of the size it once was. Those treaties are a goddam mess and can basically never be modified.