How about THIS instead of using more and more energy?

A few pellets of this will make as much coffee as anyone can drink, while enjoying many decades free of energy deficits!!...Second only to LiFePo4’s !!

https://rps.nasa.gov/system/downloadable_items/26_APP_RPS_Pu-238_FS_12-10-12.pdf#:~:text=•%20Plutonium%20is%20a%20metallic%20chemical%20element%20with,steady%20heat%20due%20to%20its%20natural%20radioactive%20decay.

3 tons





EDIT: Converted the hella long URL into a link so it wouldn't break the page anymore.