Australia: Solar Tower is a renewable energy plant that will pump out the same power as a small reactor but is totally safe.
A 1km high tower, it is hollow in the middle like a chimney. At its base is a solar collector - a 25,000-acre, transparent circular skirt. The air under the collector is heated by the sun and funneled up the chimney by convection. As the hot air rises, it drives 32 wind turbines inside the tower, which generate electricity much like conventional wind farms.
The biggest advantage over wind farms and solar generators is that it can operate with no wind, 24 hours a day, thanks to solar cells that store the heat during the day, releasing it at night.
Construction should begin this year. At 1000m, it will be almost double the height of the current world's tallest building, Taipei 101 (509m).
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