When Indonesian energy company Pertamina decided to build a new headquarters, it went big: Not only is the design 99 stories high, but it will be the first supertall tower in the world to generate its own power.

At the top of the building, a funnel captures wind, sucks it inside, and speeds it up to run a series of vertical wind turbines.

Part of the motivation is purely practical. Jakarta still has an unreliable power grid, and if the campus generates its own power, work (and play) won’t get interrupted. The buildings also won’t have to rely on diesel fuel generators if the city’s power goes down.

By Adele Peters via Co.Exist.