The Caliber ReEV's propulsion system employs a 1.0-liter, 3-cylinder, 4 valve engine mated to a UQM PP75 generator that provides 41kW of continuous power in extended-range mode, with a peak power of 75kW.
The energy generated is stored in a 20 kW-h liquid-cooled Lithium Ion battery pack that operates at 346V, with a Delphi DC/DC converter. FEV said that the batteries provide enough power for the car to cover a distance of 40 miles or 64 kilometers which seems to be the magic number for most vehicles of the sort... The Caliber ReEV can accelerate from zero to 60mph (96km/h) in 8.3 seconds and has a top speed of 84mph or 135 km/h.
For the record, the Caliber pictured above is a standard model as FEV has not releases any photos of the ReEV prototype.