It doesn't appear that you need that much energy to get off of the moon. It may even be possible to use a solar powered thruster, which uses hydrogen as a reaction mass, to do the trick. Landing may be a different matter, but taking off?
I remember watching the lunar module taking off from the lunar surface in the Apollo era. That thing was small. It is amazingly small for the job it was required to do. Think of how big a rocket was required in order to get that little thing on the lunar surface so that it could blast off like this:
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