I cannot speak for why everyone in the US buys solar. I can only speak for my local community.

If you want to find locations of grid instability focus on growth, both residential and industrial, that is radically out of scale compared to larger geographic averages. Otherwise, it seems like you are measuring using the wrong trends.

What’s crazy is that the grid instability was there before the explosion of data centers and the primary revenue generator of the much larger geographic region is energy transport/production.