Hardening focuses first on not damaging equipment and second on providing energy. If things go wrong quickly enough you don't have time to react, because after

Hardening focuses first on not damaging equipment and second on providing energy. If things go wrong quickly enough you don't have time to react, because after a power plant disconnects you get sudden bumps in load that can trigger a chain failure near the original point. The last time it happened in Europe was in 2003, which isn't too shoddy.