We now live in a world where the electric car has gone mainstream. Unlike the small leased fleet of GM EV1s or the smattering of electric-converted Ford Rangers and Toyota RAV4s of the 1990s, people are now rushing out to buy Nissan Leafs and Chevy Volts (the latter actually a gas-electric hybrid of sorts). Luxury and performance electrics like the Tesla Roadster and Fisker Karma sedan now exist and can command six-digit prices. The Tesla Model S just won Motor Trend Magazine's 2013 Car of the Year award, a first for an all-electric vehicle. But it's been a bumpy ride for electric cars, and the road to mainstream adoption is littered with small upstart companies that hoped to make a difference. In a blog that features all manner of cars from A to Z, it seems fitting to end the year with ZENN.