This doesn't align with the analysis that I've seen. For example in this post (https://www.manhattancontrarian.com/the-disastrous-economics...) the analysis shows that California would have to spend about $5 trillion on battery storage to have a solar+wind+battery grid.

If the book you reference was accurate we would be seeing headlines about power companies bragging about these new grid arrangements but instead I just see headlines about how India an China are moving ahead with enormous amounts of coal power plants, rapidly increasing energy costs where intermittent power generation is a significant fraction of power capacity (i.e. Germany), and power outages when base load generating capacity isn't sufficient to keep the lights on when the sun sets and the wind dies.