Transverse Flow Downhole Power Generator

An example well system includes a base pipe having an interior and defining one or more flow ports, the base pipe being positionable within a wellbore adjacent a subterranean formation. A flow path for a fluid extends between the interior of the base pipe, through the one or more flow ports, and to an exterior of the base pipe. A transverse turbine is positioned in the flow path, the transverse turbine including a rotor and a plurality of blades positioned to receive a flow of the fluid perpendicular to a rotational axis of the rotor. A generator includes one or more magnets rotatable with rotation of the transverse turbine and one or more coil windings mounted on a stator. The flow of the fluid rotates the transverse turbine and rotation of the transverse turbine generates electrical power in the generator.