The article rightly points out the real limitation of intermittent power sources; ie, there is no storage technology capable of replacing baseline power generation backup. All the wind and solar put together will not lead to the retirement of one fossil fuel generating plant, given present technology. If solar power supplies ten % of power supply, all that means is that the coal, nuclear and natural gas generation can be dialed back by 10%. Maybe some day there will be the long promised technological breakthrough— storing heat in molten metal eg. But technology “under development” is no use when the lights go out.
I am doubtful about the claimed costs of “renewable” energy. When there are subsidies and credits for manufacturers and purchasers of this energy generation equipment, how do you know what the real cost is? When you need backup generation capacity for when it is cloudy or when the wind is not blowing, is the cost of the duplicate generating capacity included in cost estimates?