In a small-scale generation, the rotation of the generator is one of the parameters that play an essential role in maintaining the system's quality because it dramatically affects the frequency and voltage generated. One factor that affects the generator's rotation is the fluctuation of consumer load. The Electronic Load Controller (ELC) is designed for controlling the load system the Micro-hydro Power Plant (MHP) in Sumberkapung, Andungbiru, Tiris, Probolinggo, East Java, Indonesia. When there is a fluctuation in the consumer load, the generator rotation remains stable because the difference between the generated power and the load used by the consumer will be transferred by the ELC to the complementary load. This research contains the design and manufacture of ELC regarding the MHP generator, which has specifications for a star-connected three-phase synchronous generator (Y) brand KAVEA; 380/220V; I 10/57 A; 50 Hz; n = 1500 rpm, power 30kW. ELC is designed using ACS712 current sensor as a current detector to the main load, ATMega16 microcontroller as the primary control trigger gate TRIAC BTA16-600B with optocoupler MOC3021 as isolation between circuits. Tests were carried out on each circuit block, including the primary load current detection circuit, the trigger circuit, and the synchronous generator loading test, by comparing the method without ELC and the ELC method with fluctuations in the main load current according to load fluctuations in the MHP. The complementary load power of each phase of the design is 6600 Watt with a maximum current of 30A by dividing it into eight complement load taps. The power of each complement load is 825 Watt with a current of 3.75A/tap and a resistance of 58.64ohm/tap. The results of laboratory-scale testing of ELC can maintain an average load power of 1.05% with an average rotational fluctuation of 1.05%, an average frequency of 0.59%, an average inter-phase voltage of 0.1%, and an average neutral phase voltage of 0.05 % of the nominal value.