During various periods of the year, there may be little solar and wind available over large areas. The proposed solution is energy storage, mostly using technologies that are now in the experimental stage. As the author below notes, systems that are used only a few weeks per year (when solar and wind are weak but demand high), will have very high costs per delivered KWh.
Source: Why the intermittency problem can’t be solved – Net Zero Watch
The path we are choosing seems poised for much higher energy costs in just 10-20 years, with lower reliability (California’s brownouts in the summer time now). We need to do better than this.
