THAAD (Terminal High Altitude Area Defense) missile systems are designed to take those out before detonation or ground delivery. 700 missiles have been delivered and the system has gone 16/16 successful intercepts in testing. U.S. also continues on-again off-again development of boost-phase ICBM missile defense.
Still wouldn’t hurt to have our power grid hardened to protect against EMPs...the sun can do that to us as well.
Serious EMP device detonate far above what the THAAD can deal with. Anti-sat vs anti-air.