Only true for our current computers and not true with reversible computing.
With reversible computing you can use electricity to perform a calculation and then "push" that electricity back into a battery or a capacitor instead of dumping it to the environment.
It's still a huge challenge, but there is a recent promising attempt:
"British reversible computing startup Vaire has demonstrated an adiabatic reversible computing system with net energy recovery"
Actually pretty cool - I was about to comment “nice perpetual motion machine” but looked into a bit more and it’s much more interesting than that (well, a real perpetual motion machine would be interesting but…)
This kind of stuff could trigger the next revolution in computing, as the theoretical energy consumption of computing is pretty insignificant. Imagine if we could make computers with near-zero energy dissipation! A "solid 3D" computer would then become possible, and Moore's law may keep going until we exhaust the new dimension ;)
"British reversible computing startup Vaire has demonstrated an adiabatic reversible computing system with net energy recovery"
https://www.eetimes.com/vaire-demos-energy-recovery-with-rev...
https://vaire.co/
Short introduction video to reversible computing:
https://www.youtube.com/watch?v=rVmZTGeIwnc