A human-electric hybrid vehicle is a hybrid vehicle, or more specifically a hybrid human powered vehicle, whose drivetrain consists of a human being and an electric motor/generator (and one or more electricity-storage device(s) such as a battery(ies) or ultracapacitor(s)). Some vehicles are able to operate off both human power and be plugged in to operate on battery power.[1]
It can have characteristics of a bicycle[2], velomobile or other lightweight human operated vehicles [3] with the addition of faster acceleration and regenerative braking, allowing a higher average velocity, especially in hilly terrain[4].
Some vehicles have a clutch and three or more wheels, allowing the operator to continue pedalling and charge up the electricity-storage device during traffic stops.
There are a number of private individuals and companies working on lighter vehicles using advanced materials engineering (especially carbon fiber) and lighter electrical components (ultracapacitors). Here are some examples:
http://www.asme.org/events/competitions/human-powered-vehicle-challenge-(hpvc)