SolarCity is moving to capture the home energy efficiency upgrade market the same way the Silicon Valley startup and its competitors turbocharged the market for residential rooftop solar panels: Financial engineering.

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Sure, a big hail storm or the like will do a number on your megabucks rooftop installation, but the sun itself, the very thing those cells are designed to capture, gradually damages their internals, reducing efficiency.

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They want certainty, and GE in particular wants to sell windmills, heat-capture devices, and all sorts of other industrial gear to enhance efficiency.

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