How about this..

[I_am_not_mafia]

You left out the bits where you defeated The Joker, built the Pyramids, and invented perpetual motion.

As far as energy now with things we have at hand.. Free nuclear power available to anyone anywhere in the world can be found just 7.5 miles down.
The deepest hole in the world is 7.5 mile down it is in russia. this hole was stopped at 7.5 miles because the water to cool the tools would flash before it got to the tool heads. meaning if we piped down water we could bring back up crazy high steam pressure. high enough to turn turbines and make conventional electricity..

So in a sense old sport... there is your perpetual motion machine. Just make it a closed loop system. Pump in cold water from a seal reservoir, down 7.5 miles have the water flash to steam allow the vapor to come back up as high pressure gas, run it through a turbine ,then a condenser then back to the radiator, and repeat.

No fuel used the turbine will spin till the steam washes away the stainless steel blades 100k years from now. the wate get pumped in as liquid turn to steam which forces it self out to the turbine via pipes runs through the turbine is recaptured by pipe system to a condenser making the water liquid again returns to a reservoir waiting to be used again. if the system is sealed then you will never need to refill the water nor need fuel to make the steam.

Let's review what you were claiming Drich. Admittedly you did say "So in a sense" ... but even being this generous, absolutely everything  else was wrong.

You claimed it would last until the components wore out 100K years from now.

You claimed it provides free nuclear power.

You claimed it did not use fuel.