you are thinking way too small. Consider, the US has ~200,000 miles of high tension electric wires, mostly in the eastern 1/2 of the continent.
North America covers 9.5 million sq miles but the US is 3.8 million sq miles
,
Europe covers 3.9 million square miles,
Asia covers 17 million sq miles is pretty dark mostly.
India covers barely 1.3 million square miles
Europe is already lit up and wired for electricity, as is a lot of the US, India, Eastern China, Japan smaller bits and pieces of Asia and Australia
They are all pretty well wired tho.
Africa covers 11.7 million sq miles. They need electricity
Did they wire the continent for telephones? they skipped ahead to cell phones. NO incredibly expensive infrastructure, wait till you get a swarm of sattelites for cell phone coverage, you won't even need poles for the signal.
Africa will be the next gigafactories (plural) and will have "bazillions" of micro and nano grids. look at Ta'u in Samoa, Kaua'i in Hawaii, Ocracoke island on the east coast of the US, they work are scalable, can you not see it?
look at a view of the earth at night. Who needs electricity,
Who could use, Solar and batteries and EV's?
Earth at Night
So, my vote is Africa gets a gigafactory, they need it most