Uh...no. The electrical energy that could be harvested from the average lightening bolt would be enough to power a single lightbulb for a couple of hours. You certainly aren't going to be able to disconnect your office from the electrical grid. The energy simply isn't there. Edit: Although you will often see ridiculously huge numbers thrown around for the amount of energy in a lightening bolt, it's important to realize that these numbers are usually generated by considering the power output of an entire 3-4 mile length of the bolt. Your lightening-collecting tower is probably not going to be 4 miles high. Perhaps you could float a cable with a balloon or something, but I'm not sure you could make a cable thick enough to not get vaporized by the hundreds of kiloamps of current.