In this paper the problems of transmitting trustworthy monitoring and control signals through the communication channels of sophisticated telemechanics systems using the IEC 60870-5-101 (104) are debated (104). Mathematically justified discrepancy between concepts of "information veracity" and " information protection from noise in communication channel" is shown. Principles of combined encoding ensuring high level of veracity of systems intended for energy supply are proposed. The paper also presents a methodology for estimating the level of veracity of information signals of systems used in telemechanics and the results of experimental studies of proposed encoding principles effectiveness.