Ok, what can one throw away to use less energy then?
I know that "3-8-12 NEVAR FORGET" (i.e. if you erase bits in a classical machine, you must transform a minimum of energy into heat, see here) but there is still some way until we reach that limit. So... asynchronous logic? Supercooled circuits? Josephson junctions/Quiterons? Optical interconnects? Definitely new industries are needed.