It might be useful for other readers to explain that on your #1, "less than zero for about 30% current generation", based on my knowledge it means that the "running cost" of building and then operating a renewable plant (e.g. financing it at current rates and then paying interest on the financed sum) is lower than the pure cost of operating existing "polluting" plants.

That's why it's "lower than zero".

Please correct me if that's not what you meant.