TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The vibrating assembly vibrates in response to the alternating lift coefficients in the vibrating assembly. The lift reversal device is generally rectangular prism-shaped. The vibrating assembly further includes an elastic support for the lift reversal device. The elastic support biases the lift reversal device toward a neutral position against lift forces produced by the fluid flow. The generator includes an electromagnetically active material, a magnet, a coil, and a housing that is displaced in response to displacement of the vibrating assembly. Strain is produced in the material in response to the displacement of the vibrating assembly. Relative displacement between the magnet and the coil produces electricity in the coil in response to the displacement of the vibrating assembly, or produces electricity in the coil in response to the displacement of the housing. A magnetic field produces electricity in the coil in response to the strain being produced in the electromagnetically active material of the generator. The generator has at least two of the magnets, or first and second magnets. A ferromagnetic spacer positioned between the magnets concentrates magnetic fields produced by the magnets. The displacement of the vibrating assembly in response to the fluid flow is initiated by applying an electric potential to the coil. A passage extends between opposite ends of the coil. It is in fluid communication with the fluid flowing across the vibrating assembly at each opposite end of the coil. The magnet is displaced relative to a ferromagnetic core, thus producing electricity in the coil in response to the displacement of the vibrating assembly. Relative displacement between the first magnet and the coil is produced in response to the displacement of the vibrating assembly. Magnetic fields produced by the first and second magnets bias against the relative displacement between the first and second magnets. Relative rotation between the magnet and the coil is produced in response to the displacement of the vibrating assembly. The vibrating assembly displaces in response to the fluid flow in a wellbore of a subterranean well (10). The electrical power generating system (18) may comprise a beam that displaces in response to fluid flow across the beam, thus producing a region of relatively reduced strain energy in the beam and a region of relatively increased strain energy in the beam; and the electromagnetically active material attached to the beam. The electromagnetically active material has relatively reduced volume in the region of relatively reduced strain energy in the beam, and relatively increased volume in the region of relatively increased strain energy in the beam. It is attached in layers to the beam. The relatively reduced volume of electromagnetically active material has fewer of the layers than the relatively increased volume of electromagnetically active material. Some layers on the beam increase in a direction from the region of relatively reduced strain energy in the beam to the region of relatively increased strain energy in the beam. A thickness of the electromagnetically active material increases in a direction from the relatively reduced volume of electromagnetically active material to the relatively increased volume of electromagnetically active material, or increases in a direction from the region of relatively reduced strain energy in the beam to the region of relatively increased strain energy in the beam. The region of relatively increased strain energy in the beam is positioned closer to a rigidly mounted end of the beam than to a free end of the beam. The region of relatively reduced strain energy in the beam is positioned closer to the free end of the beam than to the rigidly mounted end of the beam. A thickness of the beam increases in the direction from the free end of the beam to the rigidly mounted end of the beam. It increases in the direction from the region of relatively reduced strain energy to the region of relatively increased strain energy. A vortex shedding device is attached to the beam. It sheds vortices in response to the fluid flow. It sheds the vortices at a frequency equal to a resonant frequency of the beam. The beam displaces in response to the fluid flow in the wellbore of the subterranean well.