NOVELTY - The system comprises a container (310) such as a trench for holding an algae solution, a cathode disposed within the container, an anode disposed within the container, where a distance between the anode and the container is 1-10 inches, a voltage source electrically connected to the cathode and the anode and configured to supply a voltage between the cathode and the anode when the container holds the algae solution, and cathode rods. The voltage between the cathode and the anode causes bubbles of hydrogen gas to be formed in the algae solution.    USE - The system is useful for harvesting and dewatering algae from a growth medium (claimed), where the algae is useful as competitively-priced substituents for fossil oils and their derivatives and in applications which require a chemical-free and dewatered product such as bio-fuels, pharmaceuticals or food.    ADVANTAGE - The system enables efficient, simple and economic harvesting and dewatering of algae from the growth medium in an environmentally friendly manner.    DETAILED DESCRIPTION - The system comprises a container (310) such as a trench for holding an algae solution, a cathode disposed within the container, an anode disposed within the container, where a distance between the anode and the container is 1-10 inches, a voltage source electrically connected to the cathode and the anode and configured to supply a voltage between the cathode and the anode when the container holds the algae solution, and cathode rods. The voltage between the cathode and the anode causes bubbles of hydrogen gas to be formed in the algae solution while attaching to algae cells and floating the cells to a surface of the algae solution. The cathode is a plate, and the anode is anode rods of which each is disposed at a distance of 1-10 inches above the cathode plate. The cathode rods are disposed at a distance of 1-10 inches above the anode rod. The system further comprises a second cathode plate positioned between 1-10 inches above the anode rods. The system is incorporated into a raceway. An INDEPENDENT CLAIM is included for a method for harvesting and dewatering algae from a growth medium.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of an algae harvesting system.    Container (310)    Collector (314)    Conveyor (315, 316)    Rakes. (315a, 315b)