I'm not really sure, this resonant phenomenon already exists (https://en.wikipedia.org/wiki/Schumann_resonances https://en.wikipedia.org/wiki/Schumann_resonance

I'm not really sure, this resonant phenomenon already exists (https://en.wikipedia.org/wiki/Schumann_resonances https://en.wikipedia.org/wiki/Schumann_resonances) and is pumped by global lightning activity. However this is not very efficient as most of the energy of lightning strikes falls outside of the resonant band, which is around 7 hz. Maybe you could figure out the amount of electrical energy being spent by all global lightning strikes within a slice of time, then if you knew the spectrogram of the electromagnetic emissions from a lightning strike you could calculate the percentage of that energy that falls within the resonant band of the system (around 7hz plus the next few harmonics), which won't be much, then compare that number to the actual amount of ambient energy in the system to get a rough idea of how efficient it would be in an equilibrium state.