A big downside to renewables is how do you store all the power generated by those wind and solar power installations. It appears that we may have a solution with liquid air energy storage, which is being worked on by GE in the USA and a British company. That way, part of the power generated "charges" those liquid air energy storage locations, and they release the power when the Sun is not up and wind conditions are not ideal.
The problem with using lithium-ion batteries for such storage is the very high cost of manufacturing batteries for such an installation; liquid air energy storage uses technologies that have been around for many decades.