Comment by jabl

To comment on using direct current rather than alternating current, at least NVIDIA is working on 800VDC:

https://developer.nvidia.com/blog/nvidia-800-v-hvdc-architec...

https://developer.nvidia.com/blog/building-the-800-vdc-ecosy...

More generally, a bunch of the electrical industry heavyweights are involved in a standard for DC microgrids called Current/OS: https://currentos.org/

There are certainly advantages to DC vs AC, but there's of course a huge amount of sunken cost in contemporary AC networks.