The US company’s revolutionary power-station concept, to be built on a 6,880-hectare site near San Luis, southwest Arizona, is based on what would be the world’s tallest man-made structure — a 914-metre hollow tower — outfitted with a water-spray system.

It is able to generate 2.5GW from a high-speed stream of “downbursts” of air within the tower to turn an array of turbines in the foundation.

The