An odd partnership emerged at the Waste EXPO 2016 as truck manufacturer Mack Trucks and Tesla Motors joined forces to introduce an electrified garbage truck based on Mack’s LR model.

The innovative car manufacturer outfitted the truck with a regenerative braking system, which allows the truck to recharge its battery while it operates.

Because of the frequent stopping and start of a garbage truck’s engine, a significant amount of energy is wasted in its day-to-day operation.

“We don’t make vehicles, we just make powertrains,” said Ian Wright, co-founder of Tesla. “There’s a battery pack that you can charge from the grid, and there’s a range-extender generator which can burn fuel, make electricity and keep the battery pack charged so that you don’t run out of range.”