Yup. The smelter at another local Alcoa plant runs 23k amps through the pot line. The 5kV line is transformed down to about 1200V, rectified with some HUGE solid state rectifiers, thousands of them, and then sent out to smelt the Alumana ore into Aluminum. The smelter is pretty close to Hell! The closest there was in my mill was the remelter, 1300 degree liquid aluminum. I worked the remelter when I first went to work for Alcoa.