Re: Beyond Electricity?
"Not powered by electricity" is the sort of vague generality a TV writer would use to sound futuristic. I recall an episode of Buck Rogers where Buck was something of an expert on electricity since Mankind used it way back in the 20th century but had forgotten about it by the the 25th. (Cue eye roll.) Electricity, oh yeah, that primitive stuff.
"Electricity" is a fundamental interaction of all matter. One might generate electricity in a variety of different ways, but electricity will never become "obsolete" or forgotten, or whatever.
This does not mean that a futuristic computer must switch and perform operations with electricity the way we do today with electronics. An advanced computer might have light-based switches, or use quantum computing, or anything else a writer might dream up.