Solar thermal power … a greener alternative

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Solar thermal is the combination of solar and thermal energy generation. Solar power (the sun rays) is used to heat up a liquid (maybe directly water, or some other liquid which then heats up water), and boils the water to steam, which then runs a turbine.  Startup ausra has been on this for almost 10 years, and business is just picking up. I think it is a  brilliant idea – considering the fact that photovoltaic cells are still pretty expensive.