Researchers have been underestimating the cost of wind and solar. Of course they have. Do they even include the public subsidies required for wind and solar? They’ve also been overestimating the potential contribution of wind and solar to the energy grid because they evaluate wind and solar as an independent stand-alone energy source when they are actually intermittent sources with very high energy cost to energy output.
Read the whole thing, but set aside some time. It’s very detailed and pretty long.