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Has been done, Alex, and it’s simpler.
In essence a mountain of high voltage capacitors are connected in series to collect the charge when a bolt strikes a lighting rod. Afterwards the capacitors are switched so they are connected in parallel to produce a lower voltage for discharging to power a load, and in paralleling them this gives an extremely high amp-hour storage capacity.
This technique was used to charge capacitors supplying a linear accelerator and gathered enough power from lightning to run a town.
From an electrical safety perspective it was extremely hazardous and when parts failed during charging the damage tended to be catastrophic.
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