NOVELTY - The electric power is generated by generator (5) when water turbine (4) rotates. Several terminals are provided in hot water heater (13) with which resistance value becomes settled. The resistance value which rotates the generator with nominal speed is calculated, if the voltage value of generator is more than the lower limit, after connection of generator and user loads (18a-18c) to solid state relay (SSR) (10) by controller (16). The connection of generator and the terminals to SSR (11) is determined based on calculated resistance value with respect to SSR (10).    USE - Micro hydroelectric power generating system used in intermediate and mountainous area.    ADVANTAGE - Since the generator and the terminals of hot water heater are connected to one of the relays based on the resistance value which rotates the generator with nominal speed, the rotation speed of the generator changes with the magnitude of the connected load and the burden to the user is reduced, while suppressing the failure of the generator system. Since the resistance value of hot water heater is larger than the resistance value which rotates the generator with nominal speed, the power consumption of the hot water heater is reduced, while reducing the temperature of water in the warm water tank. Stable electric power is supplied to the user loads by the micro hydroelectric power generating system. Since the water is conveyed to the micro hydroelectric power generating system through hose, the generator system can be constructed easily. The need for maintaining the hose is eliminated, as the hose is weather resistant. The generator system is compact even if the system is capable of generating several kilowatts of electric power, the installation and maintenance of the generator system is performed easily, while reducing introductory and power costs of the system.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method of controlling micro hydroelectric power generating system.    DESCRIPTION OF DRAWING(S) - The drawing shows an explanatory view of the micro hydroelectric power generating system. (Drawing includes non-English language text)    Water turbine (4)    Generator (5)    SSRs (10,11)    Hot water heater (13)    Controller (16)    User loads (18a-18c)