"The challenge for Energy Innovations' engineers was to keep a grid of 25 mirrors focused on a single point as the sun travels across the sky - and to do it cheaply. The goal: control each mirror independently without requiring separate motors for each mirror."
And they appear to have succeeded, which could mean a cheaper way of doing rooftop solar.
Wired 13.07: The Dotcom King & the Rooftop Solar Revolution [:tech:]
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