One lightning strike only contains a few hundred kilowatt-hours of energy. Caps store something like a tenth of a watt hour per kilo, so you’d need a capacitor weighing roughly 2,800 metric tons. Hundreds of cubic meters, you’re looking at a warehouse of solid capacitors.
That’s all for the energy equivalent of one full tank of gas in a car. An entire building versus a $50 tank of gas.
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