@WandererUber yes, obviously they are going to exclude the fuel, because once you start including that, then you have to say ok, and what about the fuel for the machines which mine the stuff? And the fuel for the machines which make the materials?

And then you have the derate the costs for those because of age and location.

This is why I talk about the purity of silicon needed for solar. The cost in energy to produce that silicon - quora.com/How-many-kWh-electricity-are-necessary-for-producing-1-kg-of-pure-silicium-from-sand