I'd say the only thing you need to get electricity started is a civilization with sufficiently ready access to copper and lodestone that they're not luxury materials.

If you plop out in egypt or rome you can totally do it, it'll just be a matter of convincing people to let you try.
Get some copper wire, some flat-ish bits of lodestone, and follow this: https://www.wikihow.com/Make-a-Simple-Electric-Generator Then you crank that soulja boy and find some way to show off the electricity, maybe just have it arc between the wire ends or make a frog leg twitch or something (assuming that doesn't just horrify people). Or just make two of this setup and wire them to each other, so you can show that spinning one end makes the other end spin as well.

Hopefully that'll make some people go "oh shit what if.."