However the cost could be up to 20 - 40 % more expensive than flat plate collectors. (ahac.ie)
The basic idea is that its cheaper to build flat plate mirrors with a simple tracking devices than it is to invest in larger solar panels. (dotearth.blogs.nytimes.com)
Even relatively thin clouds will cut concentrated solar power radically, and hence concentration systems have much lower availability fraction than flat plate systems. (green.blogs.nytimes.com)