> Ironically, we already have plenty of renewable energy in the US, it’s just there, sitting, waiting to be hooked up to the grid and not being used productively.
The 947 GW is the total proposed capacity for solar projects that are in various planning stages. They have not been built yet, and most of them will never be built -- historically only about 14% of proposed capacity ends up entering service [1].
This isn't to say that it's not important to invest in the grid to handle future needs. But it's not like there's a bunch of renewable energy just sitting there idle.