NOVELTY - A electron generating method involves generating glucose 6-phosphate (G6P) and 6-phosphogluconate (6PG) by a chemical reaction of the hexose sugars with polyphosphate, ATP or free phosphate, followed by performing chemical reaction between polyphosphate and hexose sugars in the presence of polyphosphateglucose phosphotransferase while using polyphosphate. The chemical reaction is performed between the ATP and the hexose sugars in the presence of hexokinase while using ATP. The ATP is regenerated by reacting ADP and the polyphosphate in the presence of polyphosphate kinase.    USE - Method for generating electrons from hexose sugars.    ADVANTAGE - The method enables generating electrons with high yield in a inexpensive and eco-friendly manner.    DETAILED DESCRIPTION - A electron generating method involves generating glucose 6-phosphate (G6P) and 6-phosphogluconate (6PG) by a chemical reaction of the hexose sugars with polyphosphate, ATP or free phosphate, followed by performing chemical reaction between polyphosphate and hexose sugars in the presence of polyphosphateglucose phosphotransferase while using polyphosphate. The chemical reaction is performed between the ATP and the hexose sugars in the presence of hexokinase while using ATP. The ATP is regenerated by reacting ADP and the polyphosphate in the presence of polyphosphate kinase. Or, the chemical reaction is performed between the free phosphate and the hexose sugars in the presence of glucan phosphorylases and phosphoglucomutase while using free phosphate, followed by reacting G6P and 6PG with NAD or an oxidized biomimic in water to obtain NADH or a reduced biomimic, and oxidizing NADH or a reduced biomimic on an anode surface to generate electrons at the anode. INDEPENDENT CLAIMS are also included for the following:    (1) a sugar battery    (2) a system for generating electricity    (3) a method for generating electrons from pentose sugars.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of a sugar battery.