"Well, it wouldn't be very efficient, but if you've got pure-enough copper supplies or something the wire would be easy. Rotate a magnet in a loop of conducting wire, natural lodestone would work if it's strong enough, and you get electricity... Even without any other advances, you could get, uh, arc lamps and some industrial motors going, great stuff for any manufacturing..."

Roxie's gaze is, if anything, even a little blanker than normal. Now you've gotten her really engaged with the idea.