If you noticed on the read, a citation was lacking regarding that comment.
There's some good info on what is actually being done in case of an EMP attack on the link.
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Related to this effort, FEMA manages the Emergency Alert System to notify the American public in the event of a national emergency, such as an impending EMP event. FEMA has designed and built EMP-hardened communications facilities to include Primary Entry Point stations which help to ensure the ability for the president to communicate with the nation in an emergency, to include preparation for, and response to, EMP events.4 FEMA will continue to enhance EMP hardening of key facilities, validating their effectiveness against emerging threats like EMP and radio frequency weapons attacks. FEMA is developing an interagency EMP exercise to be conducted in fiscal year 2021. The exercise will address the unique, widespread, cross-sector effects of an EMP event and challenge planning assumptions used by federal planners when considering EMP actions. Since 2016, CISA and its predecessor organizations have promulgated Electromagnetic Pulse (EMP) Protection and Resilience Guidelines for Critical Infrastructure and Equipment for government and industry for mitigating the effects of EMP attacks on critical equipment and facilities. The Department is actively updating the EMP guidelines and anticipates reissuing in fiscal year 2020. IV. Partnering with the Private Sector and Other Federal Departments The Department’s priority for EMP resilience of critical infrastructure is energy and communications infrastructure. DHS and DOE have partnered to ensure unity of effort and efficient use of federal resources. One example of the collaboration is a partnership between DHS, DOE, and the Nuclear Regulatory Commission to validate the continued operation of key safety features of nuclear power plants in a post-EMP environment. This effort started in March of 2020 and will be completed in late 2021.
Electromagnetic Pulse (EMP) Programs Status Report (cisa.gov)