That is the stupidest article I’ve read in a while. Solar and wind are becoming cheaper, but they’re still more expensive than mainstream electrical generating plants. Not a lot of mystery to that one. Thanks for the clickbait.
It is a little more involved than that. The article linked to German economist Lion Hirth's research that gets into cost vs value, baseload vs variable renewables and a few other articles talked about pricing mechanisms that detailed the problems of integrating more and more intermittent sources of electricity with baseload sources, in particular if the baseload was coal or nuclear (natural gas seems to work better) . A short synopsis was in the New York Times a while back. https://www.nytimes.com/2017/11/07/business/climate-carbon-renewables.html