Support for modulation and flexible energy consumption of Aluminium Smelters is becoming more widespread. At the Inaugural Platts European Aluminium Conference in Duesseldorf, earlier this month, Industry Association, European Aluminium, gave a presentation setting out how aluminium enables a green electric mobility future. Importantly, they specifically referenced the role modulating aluminium smelters can play.
"Aluminium smelters which transform large quantities of energy but which also have the potential to modulate power demand and supply, can play an important role in stabilising power grids and reducing significantly the cost and volatility of electricity supply."
This video does a great job of explaining the green energy technology required.