So you make up the losses on volume? That’s not how math works.
Especially because a more realistic answer is it'll be profitable either way but it'll change whether the return is higher than AAA bonds or not. It's not important. It only affects very marginal projects.
I find people who advocate for renewable energy projects are almost always the same people who argue in favor of energy subsidies, too. Perhaps they know something about energy economics, the rest of us don't...