According to a post on the Facebook page of Tesla Owners Club of Alberta, a Medicine Hat, AB Supercharger site should be approved later this week:
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Is anyone familiar with the area or the history able to explain how they got that exact Google Maps location from “on Strachan Rd”?
I don’t think so. On PlugShare, this shows as one of the planned sites in NRCan’s funding bill, located here at a Petro-Canada.
Now it appears that FB group has changed to closed. 
I just put in a request to join. We’ll see if they’ll have me. I have cousins in Saskatchewan who I visit and I travel through Alberta.