Electrical, specifically. The research I've done indicates sunlight, wind, and water can also be utilized as power sources, but most of it seems grounded in converting them to electrical energy-

[He continued on like that for a minute or two, detailing the basics of electrical engineering in ways I am not remotely qualified to comprehend as he finished in the kitchen and set two coffee mugs on the table. Barely stopping for breath, Viktor continued as he settled on the couch.]

-have a library here that is nothing short of magnificent, Jayce, even the Academy has nothing quite like it. This whole world is... [He huffed out a breath that almost sounded like a laugh, picking up his own coffee mug--it smelled faintly of anise just as he'd always preferred it.]

It is like everything we ever dreamed the world could be.