Given Rey's lineage as Palpatine's granddaughter, it is also reasonable to assume she is already better attuned to using Force Lightning than the average Force user, with Ben telling Rey that she has all of Palpatine's power within her at the beginning of The Rise of Skywalker.
She and Kylo Ren were both trying to bring the transport to themselves with the Force, and in her anger, she accidentally unleashed lightning upon it, destroying the ship immediately.
While Jedi could create Force lightning, like Sith, they choose not to use that power due to its association with the dark side and immoral nature. Despite being equally as strong in the Force, one innately Sith ability that Jedi in the Star Wars franchise do not wield is Force lightning.
Dooku first used Force lightning at a young age. According to the audiobook, Dooku: Jedi Lost, he was once abducted for a Dark Side ritual, conjuring lightning to kill his captors and escape. Dooku went on to become one of the greatest Jedi masters, but his ability to use lightning was seemingly a natural talent.
Two easily explainable reasons for why Maul never used Force lightning, which have come up several times, are one) that he wasn't a Sith Lord and two) he never learned the ability in the first place.
Why Rey "Accidentally" Using Force Lightning Is So INFURIATING
Why did Vader never use Force lightning?
Darth Vader can not use force lighting, because of his severed arms. Robotic hands can't summon the force lighting. However Darth Vader can still use other forms of the force, such as force choke.
As a result, Palpatine's face changes in Star Wars: Episode III - Revenge of the Sith because his dark side-induced mask was broken by the Force Lightning rather than the Sith lord actually being disfigured by his own attack.
Sith eyes really only appear in those actively giving themselves up to the dark side. Palpatine is regularly seen without them, and Dooku seems to be a rather composed individual, given his alignment. It seems they're not permanent physical changes.
Darrus Jeht also used Force lightning against the Dark Jedi Asajj Ventress. Grandmaster Yoda himself was capable of summoning force lightning in the form of Emerald Lightning. Galen Marek was an extremely skilled user of this Force power, even after his conversion to the light side, rivaling Darth Sidious.
Yes he does enjoy the fight and is more aggressive with the form, but at no point does he actually use the dark side. The thing about Vapaad is that Mace uses himself as a conduit to redirect his opponent's dark side power back at them. So he isn't drawing on the dark side or using it himself.
While on the floor of the Senate, looking up at the cackling Emperor above him, Yoda clearly realized that he couldn't beat Palpatine in one-on-one combat. As considerable as his own power in the Force was, Palpatine's at that moment was even greater, and to continue fighting would likely only result in his demise.
Although only explained in Star Wars: The Last Jedi and The Rise of Skywalker, Rey was probably able to mimic Kylo's ability this quickly because of their Force bond and her inherent talent as a Palpatine.
Despite being equally as strong in the Force, one innately Sith ability that Jedi in the Star Wars franchise do not wield is Force lightning. First introduced when Darth Sidious (Emperor Palpatine) electrocuted Luke Skywalker in Star Wars: Return of the Jedi, Force lightning is a powerful weapon for Sith.
While unleashing the lightning storm, he screams at Vader that it is a Sith's right to revel in the glory of their own strength, and there's nothing that displays the unadulterated, raw power of the Dark Side of the Force than Force Lightning. This explains why Palpatine's default Force-attack is lightning.
With that said, it's almost certain that Dooku did know the truth about the Chancellor, and that the criticism and kidnapping was all part of Dooku's act to foster war within the galaxy. In Revenge of the Sith, the "captured" Palpatine eggs Anakin on to kill Dooku, prompting a look of betrayal in the Count's face.
Sidious may have given Dooku the title of Darth Tyranus, but because the Jedi Order knew him as Count Dooku, greatly preferring to not indulge his role as a Sith, they continued to call him by that name.
Although Order 66 greatly depleted the Jedi Order's ranks, with an estimated less than 100 Jedi surviving it, it was only the beginning of the Great Jedi Purge, which stretched on for years and claimed the lives of many of the survivors of the initial onslaught.
Star Wars Theory: R2-D2 Didn't Know Anakin Skywalker Became Darth Vader. R2-D2 served Queen Amidala and later Anakin Skywalker, accompanied by C-3PO. Unlike the golden protocol droid, R2-D2 never had a full memory wipe, so he was well aware of all events that happened around him.
However, despite their strict adherence to the light side of the Force, several Jedi were known to use this power, as although it was considered a dark side ability, it was also a technique of telekinesis. Its use, however, was forbidden by the Jedi.
Likewise, the old man also shares that the end of the war saw him being hit by lightning before falling from a tower, the same way Mace Windu met his alleged demise in Revenge of the Sith at the hands of Palpatine. However, the shogun survived despite going blind, receiving a vision to find a lost temple.
