Some business, usually Restaurants, Hotels and Malls, offer you to charge the Tesla car for free. Find in the list bellow if your city has this service:
Avenida del Siglo XXI (Parking -1 Color Lila)
8840 - Viladecans
Phone: +34 936 476 776
Av. Olof Palme, 24
08840 - Viladecans
Phone: +34 932 993 658