Plo Koon was one of the few Jedi to use Force lightning in Star WarsLegends, which could impact the dark side power rules in canon. Plo Koon was a skilled Jedi Master and respected General during the Clone Wars. While not featured much in the Star Warsprequels, Plo's force and combat abilities were highlighted in Legends and Star Wars: The Clone Wars. He came from the species Kel Door, who had many force sensitives and a faction of Force worshippers. Even for his species, Plo showed a very impressive connection to the Force that allowed him incredible patience as well as unique abilities, including Force lightning.
Force lightning is typically viewed as a Sith ability, as dark side emotions and intent is typically required to conjure it. Most famously used by the likes of Darth Sidious and Darth Tyranus, the power can be used to debilitate, torture, or even kill one's opponent. In the novel Star Wars: The Secrets of the Jedi, Luke described force lightning as the ultimate manifestation of the Force in a physical sense.
Related: Mandalorian Image Shows Plo Koon's Head On Luke Skywalker's Body To Avoid Spoilers
In Star Wars Legends, Plo Koon used a variation of Force lightning called "electric judgment." It was yellow in contrast to the Sith's blue Force lightning, and used no dark side energies when done correctly. Plo first used electric judgment on accident, and the unexpected ability made him nervous because of the previous dark side implications. However, after meditation and consulting the Jedi Council, it was deemed safe for Jedi to use. If incorporated in canon, Plo Koon's electric judgment could change the views on light side vs. dark side powers.
While Force lightning is assumed to be a dark side power, likely
Read more on screenrant.com