Yup, just coal and other fossil fuels. You see, solar thermal, wind, and whathaveyou in the renewable sector clearly aren't suitable for electric vehicles because instead of spending a few seconds plugging them in when we get home at night to charge over a 8-12 hour window, we would actually spend an extra ten or fifteen minutes going to a fast charging station, which would have to be built, just so we could whine about how we can't power a car with renewables due to problems with intermittency. ;)