6 Solar technologies to power the world

At last, solar energy is big enough and cheap enough to power electrical grids. Business 2.0 features the latest projects under the sun.

Distributed power tower
What happens if the sun's not shining? Bright Source Energy has a solution called a distributed power tower: Mirrors focus the sun's rays on a boiler, creating steam which drives a generator. Natural gas can be used to power the plant when the sun isn't shining.

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