I think you are underestinating the power of electricity. Mind you, Enel af some point used 200,000,000 volts.well mostly as someone who (at this point) doesn't know Haki, I just wonder if she could be able to. I mean I even doubt some Haki users would be able to beat him because he would just fry em before they touch him. But with Nami she pretty much predicts weather and controls with on a whim now and could probably summon something to controls enels energy and such.