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This is a pretty interesting idea, and massive: Solar Tower of Power Finds Home

From the article:

The Solar Tower 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 -- hot air rises. As it rises, the air accelerates to 35 mph, driving 32 wind turbines inside the tower, which generate electricity much like conventional wind farms.

This tower will generate 200,000 megawatts. I know that the nuclear power plant in Raleigh generates 800,000 megawatts and that handles most of the city, so this is a significant amount of power.

It is funny that it is in Australia -- It fits right in with the Australia Project.