It’s been an electrifying month for the German auto industry. Mercedes-Benz presented its first all-electric SUV. BMW offered a glimpse of its upcoming EV strategy by unveiling a concept car. And Audi is going electric, as well. On Monday, the company celebrated the premiere of its first completely battery-powered car, the E-tron. Audi’s release party in San Francisco was especially unlikely when you consider what happened just three years ago.