Abstract: The Portable Hydroelectric Generator or Alternator and System and Method of Generating Endless and Uninterrupted Electricity Using Gravity Water Flow is designed to be installed completely in a river, including a ?-shaped framed platform, placed on two pontoons, a paddle wheel located on the ?-shaped platform coupled with a gearbox, and a generator or alternator with two sleeves or muffs driven by the gearbox. The system is attached to the river bottom using three anchors and cables, connected to three hand winches, used to tighten or loosen the cables and adjust the position of the device. Electrical wiring from the device may be connected to a controller and an inverter for transferring electricity to the utility grid by electric cable. When the system is installed under waterfalls, the ?-shaped platform housing the device should be attached to a rocky cliff using two anchors and cables connected to two pivoting winches.