The ‘bumble bee paradox’ regarding the aerodynamics of bee flight was solved in 2007, however the problem of Colony Collapse Disorder is a looming threat to food crops around the world.
Recently, developments in piezoelectrics combined with our understanding of the aerodynamics of bee flight have culminated in the design and production of the robotic bee. Lighter than 1/30 of a US penny, at 80mg the robo-bee relies on piezo-electricity to convert electricity to motion - the light weight ceramic material contracting in time to the alternating current.
No batteries or guidance systems are yet small enough to be accommodated, so while it might seem far fetched it will be a while before electric bees can be relied upon to pollinate crops - at least until the real bees can recover.
Sources: 1. 2.