Bi₂Te₃-based alloys have been intensively investigated as active materials for thermoelectric power generation devices from low-temperature (< 250℃) waste heat. In the present study, we fabricated Pb-doped, p-type Bi_0.48Sb_1.52Te₃ polycrystalline bulks by using meltsolidification and spark plasma sintering techniques, and evaluated their thermoelectric transport properties in an effort to develop optimized composition for low-temperature power generation applications. The electronic and thermal transport properties of Bi_0.48Sb_1.52Te₃ could be manipulated by Pb doping. As a result, the temperature for a peak thermoelectric performance (zT) gradually shifted toward higher temperatures with Pb content, suggesting that thermoelectric power generation efficiency can be enhanced by controlled Pb doping.