Allison Transmission Electric Hybrid System to be Installed on NYCT Buses

Allison will collaborate with New York City Transit to install its eGen Flex electric hybrid propulsion system into buses used in revenue service.

Egen Flex System
Business Wire
Allison Primary Color Jpeg

Allison Transmission announces its eGen Flex electric hybrid propulsion technology will be used in revenue service with New York City Transit (NYCT) starting in May 2021. The company will collaborate with NYCT to integrate its electric propulsion technology into the transit fleet as a means of reducing fossil fuel use and emissions. 

The eGen Flex hybrid system consists of a drive unit, inverter and rechargeable energy storage system. A disconnect clutch on the drive unit enables engine-off capabilities. The system enables buses to use full-electric propulsion but without the need to add charging infrastructure. 

Use of a diesel range extender ensures the bus has enough power for longer routes, route flexibility, unplanned congestion, or an inability to recharge due to power grid challenges.

The eGen system is part of a portfolio of products which include electric axles and electric hybrid as well as full electric solutions. 

Allison Transmission says the system provides full-electric capabilities for up to 10 mi. (16.1 km), depending upon duty cycle and accessory load demands. Per the company's press release announcing the partnership with NYCT, this option will be set automatically through geofencing technology for zero emission zones and passenger depots for a quieter and cleaner environment, helping to enhance quality of life and protect the environment.

According to the company, fuel economy can be improved up to 25% versus a conventional clean diesel bus. The eGen Flex system can also provide clean power to operate vehicle accessories such as heating and air conditioning. Using the hybrid system to power these reduces strain on the bus' engine as well as fuel consumption and maintenance costs.  

“Our electric hybrid systems continue to demonstrate bottom-line operating benefits for municipalities and fleets while delivering industry-leading performance, reliability and durability,” said Rohan Barua, Vice President of Sales, North America at Allison Transmission, in the company's press release. “There are currently 2,500 NYCT buses equipped with Allison transmissions and electric hybrid propulsion solutions, and we look forward to continuing our longstanding relationship with the Authority as it transitions to our latest technology that will reduce emissions, increase fuel economy and improve the overall ease of rideability and quality of life for passengers.”

Learn more about Allison's eGen Flex system in our video interview with Alexander Schey, Chief Commercial Officer, Electrification at Allison Transmission.