"New technology in support of the Next Generation Network Priority Service (NGN-PS) Phase 2 program… utilizing the electrical power infrastructure as a backup to existing communications infrastructure."

[N]othing [C]an [S]top [W]hat [I]s [C]oming. NCSWIC. Announced today. Comm³. New technology that can use the power grid for communications. Possible back up Emergency Alert System? Possible back up net?

https://www.cisa.gov/news/2021/02/02/cisa-takes-next-step-advancing-emergency-communications-next-generation-priority