I've had a client request my participation in an electric C-150 project. Everyone is eager, including the regulator, but this will require a major shift in certification thinking, or a shift away from requiring it be certified. The present certification regulations are a long way from being able to certify an electric airplane. Not that it should not happen, it was just not in the thinking when the design requirements for certification were developed.
In any case, the cost to either certify new powerplants, or change the design regulations to adopt new concepts will be costly and time consuming. That effort might be better spent easing an entire portion of the GA fleet out of having to comply with the "old" design requirements....