Unless I missed it, Wyoming is not on the list. My daughter who lives in Wyoming told me she has only noticed one EV and it had Colo. plates.
Someone in Cheyenne had one and blogged about the adventures of trying to use it around the state. Took them 12 hours to get to Lander. It seems an absurdity to have an electric vehicle in a cold, no-big-cities, large-distances state like Montana or Wyoming.