While it may be some time before we see electric propulsion used in commercial airliners, at the other end of the scale, business is booming. The biggest problem facing designers is the weight-to-energy ratio of fuel cells, meaning that they are a heavy way of carrying around energy. Luckily in the light aviation world, designers don't have to worry so much about having long flight durations or carrying heavy payloads. This has made achieving electric and hybrid flight not only possible but also accessible to the average aviator.
Read the full article: Electric aircraft within reach of average aviators