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NREL - National Renewable Energy Laboratory
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Hybrid Electric Drive Systems

The Fleet Test and Evaluation Team conducts performance evaluations of hybrid electric drive systems in fleets of delivery vehicles and transit buses. Hybrid electric drive systems combine a primary power source, an energy storage system, and an electric motor to achieve a combination of emissions, fuel economy, and range benefits unattainable with any of these technologies alone.

Hybrid electric drive systems use less petroleum-based fuel and capture energy created during breaking and idling. This collected energy is used to propel the vehicle during normal drive cycles. The batteries supply additional power for acceleration and hill climbing.

Learn more about the team's hybrid electric drive system evaluations:

Delivery Vehicles

Transit Buses