Looks like nuclear with proper waste disposal is they way to go
One great example (some will say absurd and impractical) is just using energy whenever it is available, with minimum storage. That means cooking, heating water etc. during the day (or when the wind is high) and only using lighting and low-energy devices at night. Factories could work on a similar principle (producing more in the summer) but then we would have to rearrange a lot more stuff to suit the seasonal renewable energy production capabilities.
This may sound absurd but it only shows how much we are locked in our way of thinking about how reality is supposed to work, not what it is. There's no reason to have high quality on-demand electrical energy available 24/7/365 other than convenience. Convenience that fossil fuels brought us.
This feels like about as useful a solution as saying "the US could balance their budget by simply disbanding their military". Would it work if implemented? Sure. Would the resulting world be arguably better than before? Quite possibly. Is there a path to that outcome from the present day with a nonzero chance of success? Well...