Does Germany have any aluminium smelters?

internet:

Aluminum production is petering out in Germany, with a factory in the northern town of Stade the only one to still make aluminum oxide from bauxite it gets from Guinea. This is not the power intensive process.

Aluminum manufacture is accomplished in two phases: the Bayer process of refining the bauxite ore to obtain aluminum oxide, and the Hall-Heroult process of smelting the aluminum oxide to release pure aluminum.

It is the latter process that uses a lot of electric power.

Because aluminum smelting involves passing an electric current through a molten electrolyte, it requires large amounts of electrical energy. On average, production of 2 lb (1 kg) of aluminum requires 15 kilowatt-hours (kWh) of energy. The cost of electricity represents about one-third of the cost of smelting aluminum.

Probably.  I know they recycle everything.