We were in Bavaria two years ago, an area that is usually cloudy and foggy. All of the traditional German cottages had solar panels - we figured they were either massively subsidized or required by law because it made absolutely no sense to have them there.
In the Middle East they get about 300+ days of sunlight but you see zero solar cells there because they have oil. The price of a gallon of gas when I was there was $.18. That’s right, 18 cents.