I don't know if we have to go there. Each province has a tariff today. The transmission assets are built, collected, and paid for by use of the transmission system in each of the provinces. You could build some east-west transmission. The role the federal government might play in this case might be to give some subsidy in getting some of the transmission built, but then let the energy flow.
Today's transmission lines were built back in the 1970s and 1980s north-south into the U.S. markets, so the cost of that transmission is small in comparison to the cost of building new transmission that would connect across Canada. I think there's a help in terms of trying to get some of that transmission built, but it could get rolled into the tariffs of each of the regions, and it would be paid for by customers and users across the system.
Getting the carbon prices right so that energy costs and value are at the right market price will help pay for transmission across the region.