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Not a great deal tbh.

Inverse square law means it'll have bugger all range and those kinds of systems are large enough with enough 'capacity' to just soak it up.

Next to the control computer maybe but not in a transmission station.

Then you could just as well bring a crowbar and throw it at something to cause a short. Or just smash stuff manually. This device has a very small range.

Sure, but then someone finds a crowbar, or smashed stuff... what obvious trace would this leave, and could it be scaled up?

Shortcircuit something that transfers couple of gigawatts with a crowbar and you will have molten crowbar puddle at the end. Or vaporized.

A puddle of crowbar is still going to be forensically valuable, and a lot easier to find than for example, bomb fragments.

Knock out a city block or worse.