Solar panels are more popular the closer you are to the equator, so states like Hawaii and Arizona already have a lot of investment in solar. For the colder states, its financially a bad investment due to lack of enough sun throught longer periods of the year.
In population hotspots for example, in Socal, Solar is skyrocketing, but I wouldnt say they same for places like NYC.
I dont speak for other countries though, and wonder why some countries that should have it, havent invested enough in it (e.g latin countries, india) which receive a lot of sunlight.
China’s solar industry is operating at a 93.6% annual growth rate, looked at through the 12-month rolling average – or if you compare the first six months of 2023 to H1 2022, then the pace of installations has more than doubled, accelerating 154%