The TLJ Novelization says it was just Force Lightbing. I think Rian Johnson said that Snokes Lightning was meant to be actual Lightning but I've never seen that source.
__________________ "Vader's pulse and breathing were machine-regulated, so they could not quicken; but something in his chest became more electric around his meetings with the Emperor; he could not say how. A feeling of fullness, of power, of dark and demon mastery -- of secret lusts, unrestrained passion, wild submission -- all these things were in Vader's heart as he neared his Emperor. These things and more."
It's f*cking atrocious. Usually the artwork in Marvel's SW books is topnotch, but I'm pretty sure they have the janitor's retarded toddler drawing this shit.
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__________________
"I am tired of Earth. These people.
I am tired of being caught in the tangle of their lives."
__________________ RealistRacism: "Sheevites, much like the Banites, were meant to increase in power with each member. From Lightsnake to Gideon to Azronger, this was supposed to be the case. However, knowledge must've been lost in some kind of Gravid-like incident, as Az turned out to be a mid-tier debater with a sub-par track record, sh!itting all over Tempest's legacy. Sad."
It was the same type of force lightning. He simply dropped it on the ground instead and let it get attracted to closest conductor. That conductor, Snoke knew, was Kylo.
__________________ RealistRacism: "Sheevites, much like the Banites, were meant to increase in power with each member. From Lightsnake to Gideon to Azronger, this was supposed to be the case. However, knowledge must've been lost in some kind of Gravid-like incident, as Az turned out to be a mid-tier debater with a sub-par track record, sh!itting all over Tempest's legacy. Sad."
__________________ RealistRacism: "Sheevites, much like the Banites, were meant to increase in power with each member. From Lightsnake to Gideon to Azronger, this was supposed to be the case. However, knowledge must've been lost in some kind of Gravid-like incident, as Az turned out to be a mid-tier debater with a sub-par track record, sh!itting all over Tempest's legacy. Sad."
It was being sprayed everywhere and hit all things which were conductors of electricity. The small burst of lightning which Snoke unleashed became attracted to the ONE conductor that strong enough to attract the lightning. Palpatine's lightning was large enough to create have all conductors of electricity in a sphere around it attract some lightning. That caused everything around Sidious (including himself) to get electrocuted.
He never died, though. He got defeated and transferred his soul into his loyal hand - Droga. Then, he went on Byss and stored his spirit into a clone body.
__________________ RealistRacism: "Sheevites, much like the Banites, were meant to increase in power with each member. From Lightsnake to Gideon to Azronger, this was supposed to be the case. However, knowledge must've been lost in some kind of Gravid-like incident, as Az turned out to be a mid-tier debater with a sub-par track record, sh!itting all over Tempest's legacy. Sad."