I have Supercharged my car 5 times since I bought it. The rate had been consistent, at $0.24/kwh. Today I was in for a big surprise, at the same location it turned out to be $0.48/kwh. That's double!! Is there a time of day element to the rates? I don't remember if I have charged after 9 PM all these days. Today I started charging at 8:30 PM. Any one willing to share experiences?