User blog comment:Kaido King of the Beasts/Inferiority Complex/@comment-5398287-20150323144142

Assuming that McGuy's ability to run electricity through his sword is the result of a Devil Fruit (and, if so, I'm guessing it grants him an ability similar to that of Hei from Darker Than Black, i.e. being able to generate electricity as a surge to send through objects rather than the conventional bolt), it would definitely be inferior to the Goro Goro no Mi.

One of the games also had Enel being able to block the light of the Pika Pika no Mi with his lightning, so even though that's not canon and likely won't ever be confirmed in canon, that's an interesting one to think about.