A modular wind turbine device mountable in a plurality of locations along the exterior of a vehicle. The device comprises a low profile air inlet, a rotatable turbine that utilizes incoming air flow for motive power, and an alternator device for transforming the rotation of the turbine into usable electric power. The air inlet is a raised air scoop that protrudes from the external surface of the vehicle, similar to forced air induction inlets or brake cooling inlets on current vehicles. The inlet is shrouded with a mesh screen to prevent discrete objects from entering or interfering with the turbine device. The turbine is an elongated cylinder with protruding fins that utilize the pressure of the incoming air flow to spin about its central axis. A side-mounted alternator provides a core that spins within a stator to produce an electric current. The electric current is fed to a power management system for controlling and powering a battery pack. The device is ideal for offsetting electric power usage in electric cars by utilizing the overflowing air pressure to induce mechanical motion and create an onboard power generation source.