In this study, we investigate the phase equilibrium, synthesis, and thermoelectric properties of the CeBiTe₃ compound. CeBiTe₃ is formed in the quasi-binary Bi₂Te₃–Ce₂Te₃ section of the Ce–Bi–Te ternary system. Based on the obtained data, a phase diagram of the Bi₂Te₃–Ce₂Te₃ system was constructed. The temperature dependences of the electrical conductivity and thermoelectric force (Seebeck coefficient) were studied in the temperature range of 300–960 K. The band gap energy of CeBiTe₃ was estimated from the temperature dependence of electrical conductivity and found to be approximately 0.2 eV. The results demonstrate that CeBiTe₃ exhibits semimetallic behavior and is a promising thermoelectric material for medium- and high-temperature applications. It was found that CeBiTe₃ forms at 950 K in a 1:1 molar ratio and melts incongruently. The system is eutectic, with the eutectic reaction occurring at 800 K and a composition of 80 mol% Bi₂Te₃. The solubility limit of the solid solution at room temperature was found to be approximately 97 mol% Bi₂Te₃. In addition, the study contributes to the development of sustainable energy technologies through waste heat recovery and improved energy efficiency, in accordance with the United Nations Sustainable Development Goals (SDGs), particularly SDG 7 (Affordable and Clean Energy), SDG 9 (Industry, Innovation and Infrastructure), and SDG 13 (Climate Action).