Satellite map pictures are not a measure of size. And yes, I misspoke, it will be the largest building in the world by footprint/square footage, not the largest factory.

VW's plant is still in the conceptual stages, but if it ever happens it will indeed be impressive. But none of that makes the Gigafactory less impressive, especially once completed.

Largest factory building, but according to https://en.m.wikipedia.org/wiki/List_of_largest_buildings_in..., not the largest building in footprint. The Aalsmeer flower auction beats it by the relatively tiny margin of 8,000 square meters

By the way, the BBC recently had a documentary about the flower industry that I think is worth watching if you are interested in manufacturing and logistics. For Brits in England, it is on iPlayer at http://www.bbc.co.uk/programmes/b07czwfd, but Flora Holland seems to have it available for everyone at https://www.royalfloraholland.com/en/speciale-paginas/search....

In particular the parts about an army of marching lilies (starts about 26:50 in) and the way the auction clocks work (about 34:00 in) may be of interest to those interested in automation and efficiency (it seems they manage to make a sale every 5 seconds or so on one clock, with seven of them in the room)

That's a comparison with the Tesla Fremont factory, where they assemble the actual cars. The Gigafactory in Nevada will be 538,837 square meters(if my math is right, 5.8 million square feet for the Gigafactory is the number I have), handily beating the Aalsmeer flower auction at 518,000 sq meters.

Thanks. I guess I was wrong-footed because of limited knowledge of US geography and because Wikipedia (erroneously, I guess) states the Fremont factory is under construction.

Also, the Fremont factory is actually an old GM-Toyota factory.