Society is demanding cleaner and quieter alternatives to gasoline- and diesel-powered engines, and the transportation industry is responding. For years, scientists and engineers have been developing cleaner ways to run cars and trucks. Alternative fuels such as ethanol, biodiesel, natural gas, hydrogen, and propane have been developed and used to move people and goods from place to place. And although it will not be the sole form of clean fuel, the future of transportation will undoubtedly include electric propulsion. From a curiosity, to a rarity, to a reality, electric vehicles (EVs) are clearly on a path to becoming a necessity.