When it comes to reducing production variability (providing a near-baseload) spreading production units out at continental scale is key ( Europe: https://www.imperial.ac.uk/news/180592/european-cooperation-... ), and using a mix (wind, solar...) helps.

Then comes storage, and one of the gorillas in the room (cost, ubiquity, total power and aggregated throughput...) name is "V2G" ( https://en.wikipedia.org/wiki/Vehicle-to-grid ).