There is so many problems with that concept: What do you do when there is a strong storm? What happens if lightning strikes? How do you do maintenance and how pricey is that? How do you get the power down properly? You also have to keep a ton of space clear from buildings/people if that thing somehow starts flying away/down...
Normal wind turbines can likely do a better more efficient job - at a fraction of the cost of this public relations stunt.