It's not hard to look this up. It's not just fewer hours per day, latitude matters a lot. If you look at yearly totals[1] Alberta looks better than BC but not better than any other neighbors to the South or East. All its neighbors also have plenty of space. Plus, total energy consumption (electricity plus gas) is probably highest in winter when solar input is lowest. I think it's hard to argue Alberta will become an exporter of solar-derived power.
Northern Alberta would probably not do very good, but southern Alberta would be fine I'm sure