That sounds like sheet lightning.
And actually, yes, a fuse would blow in time if a lightning bolt hit it. They're designed so that anything over a certain wattage melts the wire inside nearly instantly. You might get a 1 amp surge at most, which spread out over an entire house system isn't much. That's enough to cause the lights to momentarily become slightly brighter before going out (As a result of the fuse blowing, which trips the circuit breaker and also breaks part of the circuit unless you've got bipass backups).
There's on average 100,000,000 volts at 100,000 amps in a lightning bolt. That's 10,000,000,000,000 (ten billion watts, or 10,000 gigawatts). Each lightning bolt is capable of putting out more power than any single nuclear power plant anywhere on earth. The most powerful nuclear bomb ever detonated was rated at 100 megatons, it's light was visible 1000 kilometers away, and at 100 kilometers was capable of inducing 3rd degree burns. The explosion itself was 45 kilometers wide, and it possessed just over 1% of the power of the sun. A lightning bolt however can easily exceed 200% of the power of the sun, often reaching 500%. That's 200 times more powerful, than a bomb which was 7700 times more powerful than the heroshima bomb. In other words, it's equal to a 20,000 megaton nuclear explosive, a device which would be so powerful, detonating it would eject the atmosphere into space, and alter the trajectory of the planet so drastically, that the shift would cause the moon to slingshot itself either out of orbit completely, or into a highly elongated oval orbit.
Now, if that's not capable of melting a 2mm wide by 20mm long strip of solder instantly, then there's no hope for the welding industry.
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