Problem: The price of solar electricity is still higher than electricity from coal or natural gas. Price parity or perhaps making solar cheaper than fossil fuel is required for widespread adoption of solar.

Solution: Bill outlines several ideas that could reduce the material, labor and maintainance costs of solar thermal electricity.

Technology that might make it possible: Energy storage using rocks, higher efficiency (~30%) sterling engine, low-weight mirror structures including a retractable wind covers, wire drive mirrior actuation and automated construction and installation of the mirrors.

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