ENEO (formerly AES-SONEL) is a mixed economy company with 51% of its capital held by the Actis group, 44% by the State of Cameroon and 5% for the personnel. During our internship for the University Diploma of Technology (DUT) at the thermal power plant ENEO Bertoua. Indeed, during our internship there was a problem of water supply in the fire water tank, hence the theme entitled "Study of the automation of the filling system of the fire water tank" whose main objectives are: to make automatic the filling of the fire water tank of 50m3, in order to have water permanently in the tank. It is also a question of being able to control the pump remotely by radio wave, and to propose a maintenance plan. We used the automatic wireless control via a radio kit to have water permanently in the tank. Afterwards, we established an alarm circuit built around a water level sensor (electric float) to signal the malfunction of the system. This project amounts to a total of 273 450 FCFA.