I doubt it: after all, gliders use that energy to stay up.

A similar thing is already done with unmanned glider. However, the energy is transferred mechanically to the ground using a rope on a winch that is connected to a generator. If you want to store the energy on board, the best way is storing it as potential energy => altitude. The Pipistrel Alpha (not a glider though) can generate a little bit of electric energy by using the propeller as a wind mill. But it's probably not very efficient, They use it only during the descent where you need to waste energy anyways.

@@fixusc Thanks for answers. Altitude as well as speed cannot be gained indefinitely. I always want to put excess energy in reserve)

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