SReplacement of BPS boiler safety systems. Experience in boilers of tangential type of Combustion, of 150MW. The change of control was carried out with two PLC's, S7400-H. One of the PLCs was dedicated to the control of mills and burners dual fuel oil and diesel and the other for boiler safety, MFT and fuel firing. For the Main Fuel Trip and fuel firing, PILTZ safety relays were chosen. The system was made following the manufacturer's guidelines and complying with the NFPA regulations. Renewal of group auxiliary control systems, water treatment system, effluent system; fuel systems, fuel treatment plants, and coal system from the coal park to the feed hoppers; slag and ash extraction systems and control of their corresponding silos. Reading and centralization of emission systems. Experience in steam turbine regulators.