Just getting that to an hour means a three order of magnitude change in the amount of connected grid storage. Good luck finding that much pumped hydro! The easy spots are taken already!
An hour is not enough, of course. That might handle some small variations in wind only. Of course, one diurnal solar cycle means you need to store power for 8-12 hours. That is another order of magnitude. So in order to do this, we need to increase our battery capacity by four orders of magnitude. Multiple days? Weeks?
Now consider that the demand curve will become even more extreme, as climate change increases demand for electric heating and cooling. And consider that you will also need to account for electrifying the cars on the road (because building out storage like this is a multiple decades project), which will place additional capacity demands on the grid.
The thing with storage is not that it's difficult, it's that it's big. Like the scale is you need to nationalize your extraction industries and turn your economy into a wartime economy whose singular purpose is producing batteries big. It's not a Tesla or Google or even a DOE scale problem.