@StephenRouse: 

Lightning striking a person or location DURING a Lightning Storm would be very easy for her. Simply raising the odds a specific someone would be struck by lightning by a large degree that it is near impossible it wouldn't happen. Though like I said I can not force free will. So I might be able to persuade a lightning strike down on someones location, but I can't control them to sit put and take it. Know what I mean?

And to the second, yes. She can't exactly just be like... "Boom, explosion." It would be more like she figures out a series of events that would lead to the power plants demise and set forth those events. So it wouldn't be instantaneous, it would be a chain of events leading to the ultimate goal of the power plant going up. Now again, if an observant person happens to see these events transpiring, they could act fast and maybe stop the ball rolling towards the end goal.