US solar energy capacity up 5-fold since 2010, and 100% in the last year alone.
This chart (slightly out of date--2011--, costs are now lower and installed capacity higher) suggests that 100% of US electricity needs could be met from solar by 2025.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.
Disclaimer. After nearly 40 years managing money for some of the largest life offices and investment managers in the world, I think I have something to offer. But I can't by law give you advice, and I do make mistakes. Remember: the unexpected sometimes happens. Oddly enough, the expected does too, but all too often it takes longer than you thought it would, or on the other hand happens more quickly than you expected. The Goddess of Markets punishes (eventually) greed, folly, laziness and arrogance. No matter how many years you've served Her. Take care. Be humble. And don't blame me.
BTW, clicking on most charts will produce the original-sized, i.e., bigger version.