The Chinese & Japanese governments are investing in space based solar which solves the nighttime problem: https://wonderfulengineering.com/china-is-aiming-to-build-a-...
https://nextrendsasia.org/japan-pioneer-of-transferring-sola...
But we really need more energy storage, and there are plenty of good ideas in this area too: better batteries, gravity bases systems, crowd sourced storage, etc.