So while the US Western grid can time shift one hour in the way you describe, Texas is isolated.
There is some support for expanding the capacity of the asynchronous DC interconnects, though, which would let Texas import & export more electricity to the other two grids without tying itself to them directly. It already does a modest amount of that, but the current DC links don't have very high capacity.
IMO, that’s a big part of the reason why backup generators are so very popular here in Texas.
Certainly, that’s the reason I have seriously considered installing a 10-15KW natural gas powered backup generator. It wouldn’t be grid-tied or even grid-interactive in any way, but it wouldn’t take me long to go downstairs and throw the transfer switch.
Nevertheless, Texas seems to be an ideal location for both wind and solar energy (and ironically, oil and gas too).
But lags in solar.