A key issue for the accomplishment of renewables is power storage because of the impact of wind and solar intermittency, both of which are highly intermittent. Most studies assume gas will be the buffer for intermittency. Other than using fossil fuel such as gas as a buffer, an adequate power storage system to handle intermittency will require 30 times more material than what electric vehicles require with current plans, meaning the scope is much larger than the current paradigm allows.
NASA Has been working on it since 2012 and is working on 3 crafts to do it named Mini Bee, Honey Bee and Queen Bee.
Here is a page about it from their website