We've stayed at Tunnel Mountain before, in February, as a base of operations for skiing. They have 50amp hookups, so we took a bunch of electric heaters along, since the furnace can't keep up.
I live in Alberta, and we are already seeing lows of -10C. So all campgrounds will have water shut off
Tunnel Mtn also has bus service into the town of Banff, so you can go to restaurants,etc if you want.
Another option in the Kananaskis area is Mt Kidd (mtkiddrv.com). Again, no water, but 50A service. Open year round, and can book on their site. Spotty cell coverage here, right in the mountains....
2014 Thor Outlaw 37MD
In The Garage: Bicycles for 4 boys, Dog Run for 4 dogs