This chart (slightly out of date--2011--, costs are now lower and installed capacity higher) suggests that 100% of US electricity needs could be met from solar by 2025. That's just 10 years away. Of course, that ignores wind and hydro power. Note double log scale, because costs are falling exponentially and installations rising ditto. I'm not sure I understand Alliance Bernstein's "grid parity" As far as I can make out solar is already at grid parity in the US.
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