[no-to-illegals]

I want to compliment you for your comments. Only one further suggestion but think you have already thought of this one and that is to bury the lines.

[backwoods-engineer]

Burying the lines does not help. These are geomagnetic currents. A few feet of dirt is "skin deep" to currents that low in frequency.

Google "Russian EMP" and find out what happened to their power plant after a nuclear test.