I would also point out that the idea itself - using peak solar to produce hydrogen which could then be used at night - is not new. My friend Jerry Unruh suggested this to me - and I wrote about it here - almost two years ago:

http://www.theoildrum.com/story/2006/12/19/164011/04

Nocera seems to be suggesting that he thought up the idea.

CSP can also be used to capture solar, store it for a few hours (in the form of heat), and then use the heat to generate electricity at night.