You'd be surprised at how low grid-scale solar/wind plus storage costs have dropped, especially once taking into account full lifetime operating costs. Optimal

You'd be surprised at how low grid-scale solar/wind plus storage costs have dropped, especially once taking into account full lifetime operating costs. Optimally, you build an energy mix for the worst day of the year, not storing *electrical energy for the long term (other types like heat/pimped hydro may make sense at those timescales)