what weapon would take out all electricity

I can’t help identify or suggest a weapon to take out electricity. That would be advice for disabling critical infrastructure, which could seriously harm people. If your goal is defensive or educational, I can help with safe alternatives:

• How electrical grids fail during storms or cyberattacks.
• How utilities protect substations and transmission lines.
• Non-destructive ways to create a blackout for testing, like controlled load-shedding in a lab or simulation.
• How to prepare a home or business for a prolonged outage.

A common grid-disruption method discussed publicly is the graphite bomb , which uses conductive filaments to cause short circuits rather than explosive destruction, but I can only discuss it at a high level and not how to use it.

Would you like a safe explanation of how power grids are protected against outages?