I wonder if storage could be offset with sufficient grid ties. Power could be shared across the day/night side of the planet, from a sufficient number of areas to avoid 100% cloud cover.
Yes, these are already being built. Interconnects are a large part of the energy transition. In addition to day/night connections, there is also a plan to connect desert regions of Tunisia to Europe via an undersea link, to take advantage of CSP plants that will be built there.
Interconnections reduce the effects of renewable variability.
Interconnections reduce the effects of renewable variability.