Available electric motor and power-management systems are adequate, however significant technology challenges remain in the development of batteries, fuel-cells, and light weight H2 tanks
Battery powered aircraft will require a 10X energy density increase to match Light Utility GA piston performance, but looks like a viable option for Light Primary Trainer aircraft in the near future
Several potentially viable approaches exist for electric propulsion- systems and targets for component performance have been identified, but significant development work remains before the best solution is known
The rate Electric Aircraft Propulsion technologies are advancing is encouraging and holds the promise of new more capable aircraft in the near future.
EAA Electric Aircraft World Symposium 2010: Michael Dudley