Find a way to build georedundant electricity links from stable solar fields in e.g. the Sahara or so, up to Europe, with a reliable capacity of ~ 1 TW or maybe even closer to 5 TW, along the feeding solar arrays, and we can use existing ways to store energy for nightly use to wean Europe of natural gas in about a decade.

The largest one build seems to be 10 GW between Xinjiang and Anhui. It's still quite a bit from the scale we'd need to wean of natural gas however.