Sun has two large problems: a) the nights and b) bad weather. A) is quite predictable and usually electricity consumption is lower in the night but b) needs a f

Sun has two large problems: a) the nights and b) bad weather. A) is quite predictable and usually electricity consumption is lower in the night but b) needs a fix. So large scale grids can not only extend the time per day solar energy is available but also compensate for bad weather. Over large enough areas, the total solar output is more constant. Add in a good amount of wind energy a pretty constant load should be bearable with renewal energies with very little of storage.