The point of the article is that unreliable energy like wind and solar with 35% and 25% capacity factors is extremely challenging to scale beyond those numbers.

The point of the article is that unreliable energy like wind and solar with 35% and 25% capacity factors is extremely challenging to scale beyond those numbers. Large-scale low-carbon systems that are 24/7 reliable regardless of how windy or sunny it is may be more effective. Lots of people are promoting 50/50 mixes of intermittent/unreliable renewables + nuclear. The author of the article thinks the renewables are problematic and our money would be better spent just going for 24/7 reliable clean energy sources.