Years ago it was "Let Eastern Canada freeze in the dark." Now it's "Please help us sell our oil." You can't force any province to allow a pipeline through because provinces have all sorts of powers to block a pipeline so that it can't be used. Road access can be denied. Electrical services can be denied, etc. Alberta simply depends on the permission of the host province and it is "Lets Make A Deal." Alberta at this point is best off trying to sell its' oil through the US but it will never get world prices and volumes will be limited.