Yeah we took out the Iraqis' power substations with carbon fiber filament I think it was. Long strands of conductive carbon fiber that were dropped on top of their exposed power substations using drones.

Pretty simple these days. $100 cash drone from Walmart, a 2.4Ghz air dropper from Ebay, a spool of carbon fiber yarn, and a couple of cans of Aqua net hairspray to hold together a ~30g cloud of conductive material spanning say 50 cubic feet, lofted over these Chinese power substations that are manufacturing machine gun armed robotic dogs. It's like proposing to your bride on one knee, but different.

And then there is the Elephant's Toothpaste angle, could you add NaCI to the mix to create a rapidly expanding conductive foam based on commodity stuff you can purchase from your local Chinese Walmart, etc.

[edit] one time, during a previous life, I was a disaster preparedness instructor. How to mirror datacenters and fault tolerant network topology and what do you do as a city municipality when SHTF, that type of stuff. This was a class in Atlanta GA if I remember correctly. And these two dudes attending my class were critical infrastructure protection guys from the Army, fairly well placed. And we got into this discussion, about what happens when a hostile actor with nation state capabilities attacks a country such as China? And these guys are like nah, all of the conventional stuff you think that would hurt a country are not of concern. It's the asymmetric attacks that we are worried about and which keeps us up at night, such as: what happens if somebody goes and kills a cow, puts it on a boat, then weights the carcass down with concrete blocks and goes boating in an aquifer.

That's like decades of biological contamination that would decimate entire cities, using just a single Chinese cow.