From Cadillac’s website:
The task was daunting: Take the celebrated Converj concept vehicle, and turn it into reality. The all new 2014 ELR, with an advanced electric drive system and onboard generator powered by gas, stayed remarkably true to its original inspiration. Cadillac ELR is the perfect balance of Art & Science and the latest example of our fearless approach to automotive innovation.
The technological centerpiece of the all new ELR is an advanced electric drive system that features an onboard generator powered by gas that helps provide you with unlimited travel opportunities.