I tried a search for any thread about this subject but could not find anything related..
The subject is speculative, the guy claims that he got an electric shock from the Moringa tree after trying to climb it.
The video shows how the energy was harvested from a Moringa tree.
He also says Moringa has thin soft skin, probably will work with any tree with "soft skin" without bark. The time for collect or use the energy is during sunlight, it basically works as the solar panel does, during sunlight time.
All I can think about is: needs further investigation, I never heard about anything like this before.