The Buffalo plant is aiming for a gigawatt of annual cell production by 2019: https://www.bloomberg.com/news/articles/2017-08-31/tesla-starts-production-of-sol

The Buffalo plant is aiming for a gigawatt of annual cell production by 2019: https://www.bloomberg.com/news/articles/2017-08-31/tesla-starts-production-of-solar-cells-in-buffalo https://www.bloomberg.com/news/articles/2017-08-31/tesla-sta... Which is admittedly not large by global standards, but bigger than any solar manufacturing facility that has operated in the US.