I do not see what it would not be cost effective for the amount of power it would be used. To power entire world with solar we would need solar installation siz

I do not see what it would not be cost effective for the amount of power it would be used. To power entire world with solar we would need solar installation size of Spain or bit less in Sahara, and to connect about 2000km cable over Algeria–Morocco i really do not see the issue, and that does not include current wind solar installations.