One alternative is that you overbuild and connect very widely. China has 3000+km power connections. If you do that you can connect to remote wind, which is neve

One alternative is that you overbuild and connect very widely. China has 3000+km power connections. If you do that you can connect to remote wind, which is never not blowing somewhere within 3000km of you. During the day, solar nearer the equator could power areas further away. That’s not the full answer but definitely a useful addition to storage. There are also battery tech like liquid metal that is being more widely tested and suits grid storage. That scales like crazy if it works.