Like all good petro-states much of this vital information isn't readily available to the public and just as much probably isn't even known. It's just as easy to cook the books as it is to cook the bitumen.
The sludge we process to provide SUV juice to American gas pumps is heavily subsidized. For example, if Big Oil paid the actual value of the vast quantities of fresh water it draws from the Athabasca and Peace Rivers there probably wouldn't be a project at all. But the oil companies get that public property for virtually nothing. When we give public property to a private company, that's a subsidy.
What about the land, air and water contamination associated with bitumen extraction and processing? When you let the producers off the hook for the cost of cleanup, that's a subsidy. When our healthcare systems and society bear the cost of the human toll from that contamination, that's a subsidy.
Today there was a torrent of greenwash from the Alberta government about carbon capture and sequestration. There'll be a fund set up for that - a shared fund - industry and the Alberta government will pick up the tab (supposedly). The government's share is a subsidy.
But what might become the biggest subsidy of them all is the Alberta government's agreement to assume liability for whatever might happen should all those millions of tonnes of compressed CO2 leak back out to the surface - ever as in forever and ever, amen. CO2 is lethal.
These are all subsidies but only when you recognize them for what they are. If you're like the Alberta government or even our federal government, you can pretend to turn a blind eye. But that doesn't change a damned thing and, when it comes to change, it'll be the people of Alberta who stand to get short-changed.