Parks, I can tell you that
Parks, I can tell you that the batteries are supplied by Altair Nano and the motor is a UQM PowerPhase 150 PM motor customized for Proterra. They don't say what the battery capacity is, but I was told by a company rep that the stored energy is more than sufficient for over 1 hour of typical operation before recharging. Their battery packaging and charging system are proprietary; the charging is wireless and occurs overhead. The driver simply pulls into the "alignment scoop" and wireless controls guide the bus to the appropriate position and do the rest of the work. It's a pretty neat system, and it appears as though the charging system (FastFill), powertrain (ProDrive) and battery system (TerraVolt) are all engineered by Proterra to work together to improve efficiency, as all are trademarked as proprietary technology. As for regen, I would imagine the bus has a pretty robust regeneration system to take advantage of the frequent braking on your typical urban bus route. I believe the buses retail in the $800,000 to $900,000 range, but Proterra is working to lower their costs to reduce the sale price.