From the Fusion Energi website:

"The new Fusion Energi is designed to be efficient, thanks to combining a high-voltage battery and electric motor with a gasoline engine. The high-voltage lithium-ion battery pack provides enough power to operate in all-electric mode for short commutes. Thanks to plug-in capability, you can charge the battery using a 120-volt outlet. Or you can use a 240-volt outlet, upgraded with electric vehicle supply equipment. To lessen any concern you may have about driving range, when the battery is depleted or more power is required, the vehicle functions as a traditional gas-electric hybrid. The Fusion Energi also features a Regenerative Braking System, allowing it to capture kinetic braking energy and store it for later use."