I think a while back solar panels got cheaper than the curved mirrors used in molten solar based solar thermal plants. 'Cheap lower efficiency solar cells' bec

I think a while back solar panels got cheaper than the curved mirrors used in molten solar based solar thermal plants. 'Cheap lower efficiency solar cells' became uneconomic when the non silicon cost of the panels became too high a proportion of the total cost. Because half the power per panel at 2/3rd the cost per panel doesn't pencil out.