Saw this vid from Gaza and made me think of your Apocalypse story. Was going to post it there but not sure if it's against the rules. They basically took a computer fan and hooked it up to a battery and used wood to generate a current that spins the fat to generate electricity.
https://www.tiktok.com/t/ZT8S4RYuc/
https://www.tiktok.com/t/ZT8S4RYuc/

Reactions: Magnaru, DawnsGate, Venyr4434 and 2 others