This is one freaking second. I mean look at all the electrical discharges that pop up in what is likely a split microsecond. Pay close attention to the ground to cloud lightning. [ame="http://www.youtube.com/watch?v=-bvmEYxEYiA&feature=player_embedded"]YouTube- Slow Motion Video of a Multiple Tower Upward Lightning Flash on 6/16/10[/ame]
Looks like 1.21 gigiwatts, now if only we could harness that power into a Delorean. All joking aside, that's a pretty awesome video.