While the number of electric vehicles in use in Arizona has increased at a steady pace — tripling in the last year and a half — and the U.S. government has been investing hundreds of millions of dollars in efforts to promote electric automobiles, the state is seeing far from a big enough jump in ownership of the electric-powered automobiles to significantly realize their potential as an environmentally beneficial power source. Steven Polzin, a research professor in the School of Sustainable Engineering and the Built Environment, part of the Fulton Schools, and a former U.S. Department of Transportation researcher, talks about the combination of various factors that appear to be slowing the transition to electric.