It's absolutely not. These calls for relying on renewables are pure fantasy; the storage technology doesn't exist yet, so you can't build a reliable power grid based on something that isn't in existence.

It's just like the calls to rely on fusion power instead of building fission plants. Fusion doesn't exist (as a usable power generation method), so calling for it to be planned for now is ridiculous. It's the same with storage systems; we don't have any that can supply the entire grid yet. We're having a hard enough time just getting enough lithium to make batteries for the relatively small number of electric vehicles on the road now. There are things like pumped-hydro, but those only work in some places, and we already have them (i.e., we can't make more of them, because we've already exhausted all the available hydropower sites), and they're not enough.

Don't get me wrong: renewables are great for what they're good at: supplying variable power, especially on sunny days, and the US in particular could definitely stand to deploy much more, particularly in the sunny states where a lot of power is used for A/C. But it's not a solution yet for baseload power.