Electricity transmission is costly, and that's assuming there's the infrastructure in place to do it, which, more often than not, is not the case. This idea that electricity exists as a fungible resource on a global market is totally false.
In practice, switching too quickly to reliance on renewables has resulted in poor people seeing their electricity bills skyrocket and greater demand on coal plants when renewables fall short and nuclear plants are no longer running to provide base power.
In practice, switching too quickly to reliance on renewables has resulted in poor people seeing their electricity bills skyrocket and greater demand on coal plants when renewables fall short and nuclear plants are no longer running to provide base power.