When shooting lightning, it tends to be treated as a sort of beam you can aim and shoot anywhere. This doesn't make a whole lot of sense — lightning is a really big static charge, like you get all the time when you're wearing sweaters. Static electricity will leap from something with high potential to something with low potential; the only way to aim it should be to modify the potential of both yourself and the target, in which case, it would be impossible to dodge. All this is always ignored. Sometimes their power is called "thunder," which is a cool-sounding misnomer.
However, if the emphasis is on controlling the plasma rather than the actual electric current, then it's justified.
Which isn't necessarily a huge problem. In Real Life, shooting a UV beam through the air will ionize it, providing the needed plasma channel for the electricity to flow through. This is called an electrolaser. In fiction, a character with electricity-generating powers could have this as a Required Secondary Power, or wear a suitable UV laser.