(co2 + algae + tec) = $$, page-26

They would be using mirrors to refer the sunlight, a curved mirror will concentrate the sun's rays. The company has stated that the containers cannot be placed in all areas, that it depends on access to sustained sunlight. So a mediterrainien climate is ok but not scandiannavia for instance.

There are any number of problems they could be having with scale. It could involve sunlight, but engineering problems arise with varying complexities. There is another company MAK that is also doing a scaled up version of a proven trial and the SP is foundering for the same reasons. In each case, it's a matter of wait and see. That's why it's a buying opportunity if you like their expertise and think they can do it.