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This chart (slightly out of date--2011--, costs are now lower and installed capacity higher) suggests that 100% of US electricity needs could be met from solar by 2025.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. These days I'm retired, and I can't by law give you advice. While I do make mistakes, I try hard to do my analysis thoroughly, and to make sure my data are correct (old habits die hard!) Also, don't ask me why I called it "Volewica". It's too late, now.
BTW, clicking on most charts will produce the original-sized, i.e., bigger version.