The assembly of capacitors included manufacturing individual capacitor coils, packing them in a metal case, insulating them with oil and cardboard, drying as well as welding and painting the outer container. The amounts of electricity, paint, steel, wires and water needed for the processes and running the overall factory were based on current annual production statistics (personal communication with Alstom Grid). The individual coils were manufactured on site from aluminum, polypropylene (or nanoengineered film), fuses and wiring.