Bosch has unveiled electric trailers with regenerative braking , which the company estimates will save up to $ 10,000 per year . Any fuel saving also reduces CO2 emissions.” The system will “ integrate an electrical machine into the semitrailer ’s axles , instead of simply allowing them to move freely ” , the German auto - parts company said . This is a similar function to that used in most electric vehicles . It allows the vehicle to generate and store electricity when braking . This electricity can be used to cool the vehicle 's refrigeration unit or to boost acceleration during hill starts . The system is available for new and used trailers .
Bosch has unveiled electric trailers with regenerative braking , which the company estimates will save up to $ 10,000 per year . The system will “ integrate an electrical machine into the semitrailer ’s axles , instead of simply allowing them to move freely ” , the German auto - parts company said . This is a similar function to that used in most electric vehicles . It allows the vehicle to generate and store electricity when braking . This electricity can be used to cool the vehicle 's refrigeration unit or to boost acceleration during hill starts . The system is available for new and used trailers .