I really don’t get the issue with kWh. Things are rated in W and we mostly care about the hours they’re powered on. If I wanna figure out how many kWh a PC that needs 300W used in 4 hours, I multiply 30*4. If I wanna know how many joules it used, I have to do 300*4*3600. Only one of those can be done in your head in 3 seconds.
Brother, that’s a whole new computer. Anyway, have fun and, if you haven’t already, you should install KDE Connect and Syncthing. I don’t know what you use your computer for but I have yet to meet someone who wouldn’t benefit from it.