It is a bit more high tech than the old system that threw carbon fibre filaments over the power grid. Nobody wanted to talk about that when it was used in Serbia but the power station guy holding u[p handfuls of the stuff for the press was a bit hard to deny.

This technology is the realisation of the original British scheme in the 1930s for a death ray to be used against bombers. Turned out that it could not be done back then, but a smart chap called Watson-Watt noticed that it was quite good at detecting aircraft.