Forget the 3,280 feet-high 200-floor Nakheel Tower because it’s no longer going to be the highest skyscraper in the world. The new upcoming beast is this amazing 1.55-mile-high skyscraper planned for the Jumeirah City project in Dubai. The building is so tall that its main elevator is in fact a vertical 125mph bullet train. This city-in-a-skyscraper will consume 37,000 megawatts per hour per year, with a 15MWH peak usage, but as the plans show, it has been designed to generate most of it using wind, thermal, and solar power.