The author of this article doesn't know what they're talking about. The amount of energy we can store just isn't enough to supply the grid when wind and solar stop, and probably won't be for quite a long time if ever. (The "ingenious ways" they're referring to is pumped hydroelectric, which suffers from a severe lack of suitable sites, most of which are already in use. It's also probably one of the first things people think of as a solution.)