The US does not have a nationwide electric grid, so adding more solar power in Arizona or Florida can't supply Wisconsin with electricity. Early solar farms we

The US does not have a nationwide electric grid, so adding more solar power in Arizona or Florida can't supply Wisconsin with electricity. Early solar farms were very concentrated in sunny states because the equipment was expensive enough that they couldn't make money elsewhere. As solar equipment has fallen in price, there are more places where a solar farm can turn a profit. That's why solar farms are now being built in places like Wisconsin. States like Arizona are still adding solar farms each year but now less sunny states are also building solar farms because falling equipment prices have made it practical.