[niftich]

There has been at least one combined PV + CSP scheme proposed [1][2] in Chile.

This article [3] analyzes some of the merits of this approach.

[1] (Partial paywall) http://social.csptoday.com/technology/integration-csp-and-pv...

[2] https://en.wikipedia.org/wiki/Copiap%C3%B3_Solar_Project

[3] http://spie.org/newsroom/6018-photovoltaics-and-concentratin...