From Whiplash on Gab:

https://www.cisa.gov/news/...

CISA will use Comm³, which is managed by Crius Technology Group, to demonstrate how national security and emergency preparedness (NS/EP) communications signals can be routed to the electric grid as an alternative communications pathway in a way that prioritizes first responder traffic over all other traffic, utilizing the electrical power infrastructure as a backup to existing communications infrastructure.