In the interest of fairness, one cannot cite Palpatine's manipulations of the Rogue Shadow as concrete evidence of his abilities, given that the cutscene is non-canon.
On the other hand, objectively, since the cutscene represents a "what if" scenario had Marek opted to finish off Vader, one could argue that it is certainly within the realm of Palpatine's abilities.
That's a nice little tug-o-war that I'll let DS and Exodus handle, since legitimate points can be made for both.
Likewise, I have to mention three cases of the Emperor's use of lightning that didn't make it into my essay:
a.) In Betrayal, after a renegade stormtrooper shoots Palpatine's drink out of his hand, Palpatine turns and unleashes Force lightning upon his enemies -- managing enough control to avoid the Royal Guardsman -- and killing all fifty of them.
b.) In Resurrection, Palpatine obliterates three Sith acolytes with Force lightning. This is of particular note because the force of his attack left nothing but a charred skeleton. And such energy came from one hand. It should also be noted that Sith alchemy is an art reserved only for the most powerful practitioners of the dark side, according to the Dark Side Sourcebook. So the acolytes were pretty hardcore.
c.) In Dark Empire, despite being on the verge of death, Palpatine singlehandedly overpowers Leia Organa Solo with lightning and mortally wounds two Jedi with a single burst each.
Bane has proved to show a mastery of lightning as well. I will explain what he did with it and lightsaber throw in a bit, typed it but didnt show up =-(
__________________ Anar
Nanye i ne Anduril i macil Elendilo
Lercuvanten i moli Mordoreo
Isil
Turgon aran Gondolin tortha gar a matha, i vegil Glamdring gud dae lo, dam an Glamhoth.
__________________ Anar
Nanye i ne Anduril i macil Elendilo
Lercuvanten i moli Mordoreo
Isil
Turgon aran Gondolin tortha gar a matha, i vegil Glamdring gud dae lo, dam an Glamhoth.
Yeah, has Sidious demonstrated lightsaber throw? How about force Wave? Force Storm? he has demonstreted force wtf-where-the-hell-did-that-wormhole-come-from-Sidious-made-that-oh-****-we-are-all-gonna-die-he-took-out-a-whole-fleet-of-ships power...............
__________________ Anar
Nanye i ne Anduril i macil Elendilo
Lercuvanten i moli Mordoreo
Isil
Turgon aran Gondolin tortha gar a matha, i vegil Glamdring gud dae lo, dam an Glamhoth.
Actually, it's depressing to note that Sidious is better than Bane in just about everything. He's smarter, more powerful, more successful. Hell, he's even something of a ladies man.
And I say depressing because it's true. We're heading into Gary Stu territory.
Wait, Bane was also a genius.............. He was the one who knew how to hide 2 very powerful dark side users from the jedi for a long time............. over 10 years........... And yes, he is more powerful. Successful, not sure. Bane destroyed the sith, rebuilt them from the ashes, made a galaxy network of spies, and set the bar that would even allow Sidious to be a sith and do what he did. Sidious did alot by himself with no influence from Banes stuff, but he would have had a harder time without it.
__________________ Anar
Nanye i ne Anduril i macil Elendilo
Lercuvanten i moli Mordoreo
Isil
Turgon aran Gondolin tortha gar a matha, i vegil Glamdring gud dae lo, dam an Glamhoth.
And that is supposed to be.................. who exactly?
__________________ Anar
Nanye i ne Anduril i macil Elendilo
Lercuvanten i moli Mordoreo
Isil
Turgon aran Gondolin tortha gar a matha, i vegil Glamdring gud dae lo, dam an Glamhoth.
Thats Bane i think............ The face suggests it, mainly the forhead, and jaw.........
__________________ Anar
Nanye i ne Anduril i macil Elendilo
Lercuvanten i moli Mordoreo
Isil
Turgon aran Gondolin tortha gar a matha, i vegil Glamdring gud dae lo, dam an Glamhoth.