Allison Transmission Earns Certification from California Air Resources Board for eGen Flex™ Electric Hybrid Propulsion System

INDIANAPOLIS, April 19, 2022 – Allison Transmission today announced it has received certification from the California Air Resources Board (CARB) for the model year 2022 eGen Flex™ electric hybrid propulsion system paired with Cummins B6.7 and L9 engines. Since 2014, Allison has received annual certification from CARB for the Allison H 40/50 EP™ propulsion system. For the first time this year, the certification was awarded for the eGen Flex, the company’s newest electric hybrid solution for transit buses and coaches.

Introduced in 2020, the eGen Flex electric hybrid system is capable of traveling in electric-only mode for up to 10 consecutive miles or 50 minutes. This electric-only mode can be utilized multiple times per route and per day. In real world revenue service, Allison’s eGen Flex has demonstrated the ability to operate in full engine off mode for more than 50% of its time in operation across multiple routes within one of North America’s largest transit fleets. The eGen Flex is further capable of eliminating engine emissions and noise while loading and unloading passengers, in dense pedestrian areas, and in zero emission zones and bus depots. In addition, the eGen Flex improves fuel consumption by up to 25% versus a conventional diesel bus.

“We are thrilled to receive CARB’s certification for the eGen Flex, Allison’s latest innovation in electric hybrid propulsion technology,” said Barbara Chance, Director of Mobile Source Regulatory Compliance for Allison Transmission. “The H 40/50 EP legacy system was the first electric hybrid propulsion system to be certified in California for transit buses and coaches. We’re honored to now collaborate with CARB to earn certification for the eGen Flex, which provides revolutionary capabilities for public transit.”

The Cummins B6.7 and L9 diesel-electric hybrid engines feature proven technology designed and developed in-house that is optimized to deliver the efficiency, durability and performance on which transit bus customers depend. The B6.7 diesel-electric hybrid engine is rated at 280 hp (209kW) while the L9 diesel-electric hybrid engine is rated at 330 hp (246kW) for the transit bus market.

“Cummins is excited to have received the necessary CARB certifications for the integration of our engines into Allison’s next generation electric hybrid propulsion system,” said Francisco Lagunas, General Manager, North America Bus Business, Cummins Inc. “We believe the latest Cummins and Allison clean diesel power system will provide our bus customers an even more reliable and environmentally-friendly powertrain to help them be as successful as possible.”

19 Apr, 2022