Inspiration : SolarThermal Renewable Energy

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You know I just had a brilliant idea for renewable energy and so I thought I'd share it with you. Generally solar panels that convert the sun's light to electricity are very expensive. But what if we simplify it?
You know how we use a magnifying glass to burn stuff (ants!), and how geothermal energy basically uses heat to turn water into steam to turn giant turbines.
So my idea is simple, use a giant magnifying glass (you could buy one cheap off the Hubble Telescope!) to focus the sunlight onto a large container of water. This will quickly produce heat and turn it into steam. Channel the steam to turn your turbines, using a dynamo to convert the movement to clean electricity.
Shall I coin the term Solarthermal energy? So will I make a million bucks out of it or is it a stupid idea?
Imagine having a few of these in a desert. You would have cheap energy!

Woops...after googling it, I just realised I reinvented the wheel...

Solarthermal Energy