This is one of those things that no one realizes cause no one draws too much attention to it, but the US hasn’t been slacking on renewables in general - https://en.wikipedia.org/wiki/Solar_power_in_the_United_States - https://earthenergylog.com/articles/solar-power-statistics-us-2026

The thing is, developing countries will always see a bigger impact from newer technology because they are developing and so are building up base capacity. In the US we already have a lot of base load that already exists, so new power is to either increase overall load or to replace. Both of those things typically happen slower than new build out.