If it pencils out, then they should do it, but I think retrofitting a whole grid for 1 or 2 point sources is a bit expensive as they seem to have many many generation plants all over right now.Build? Yes. Maintain and secure? Not so much. Darlington OPEX is around $0.036/kWh all-in, including all staffing (including security), maintenance and fuel. This does not include refurbishment however.
Smallest CANDU is of course the EC6 at 725MW, not "small", but would work fine for Alberta, as they were originally looking at 1,200MWe units at Peace River.
I mean, Quebec did it? Most of their power comes from the James Bay Project and Churchill Falls, both of which are much more remote than any nuke would be in Alberta or Saskatchewan.
The Quebec hydro system is also paid for by a lot more people, in Quebec and 10's of millions in the US, so what works there, may not apply to the west either, as there isn't really many densely populated areas until you get to the coast.
But for two provinces pretty dependent on fossil fuels, the government investing in nuclear will be essentially helping fund a reduction in a main industry of their economy. I don't know what the manufacturing capabilities are in Alberta? Maybe they do have some knowledge base to quickly pivot to nuclear from resource extraction/refining? Probably for Alberta /Sask, the best case scenario is for the rest of the country to help fund all these CO2 reduction technologies while they continuing to allow fossil fuel extraction...