Luke was able to use force lightning, as was Revan and Plo Koon, among others. Galen Marek was an extremely gifted user of this Force power, even after his conversion to the light side, rivaling Darth Sidious.
Force lightning ability was not restricted to dark-siders. Jedi and other light-siders who were strong of will and character could learn this power without falling to the dark sideóbut its use was viewed as inherently corrupting, and most Jedi Councils forbade its use.
Some members of the New Jedi Order such as Kyle Katarn and Jaden Korr also used Force lightning. but it remained very controversial. Other Jedi practitioners of this power have been Relin Druur, Kyp Durron, Jaina Solo, Jacen Solo, Mara Jade Skywalker and Luke Skywalker.
"The next thread will discuss the Jedi use of Force Lightning"
I will be covering the use of Force Lightning by Jedi in the next thread.