Abstract. We report the performance of a T-shaped, plate-type thermoelectric power generator (TPG). The plate-type TPG has been proposed by the authors. A new design of the plate-type TPG realized the higher power density together with the higher power at a small temperature difference. For example, the maximum power of the T-shaped, plate-type TPG was 11.1 W m 3 at the temperature difference of 40 K, and this value was over 2 times greater than that of the previous TPG. IntroductionAmong the power generation technologies utilizing the renewable energy resources, such as wind, solar, vibration, etc., thermoelectric power generation has been attracted considerable attentions recently because our daily lives are full of waste heat. Seebeck effect is a phenomenon, which convert heat into electricity, can be explained simply by considering an electrical circuit comprising bi-metal wires. If there is a temperature gradient T between two bi-metal junctions, a thermoelectromotive force, V, appears in the circuit and this is given by V = S T, where S (=  1   2 ) is the Seebeck coefficient of the circuit, and  1 and  2 are the absolute thermoelectric powers of each wire metal.Although the thermoelectric power generators (TPGs) composed of Bi, Te or its related alloys realize greater V [1, 2], such rare metals are the limited resources. Moreover, TPGs composed of Bi, Te or its related alloys have relatively higher internal resistance, which increases the power consumed in the circuit. To realize the efficient power generation from a small T without using such rare metals, a platetype TPG, which is composed of an Fe plate and an Al layer, has been proposed by the authors [3].In this paper, a T-shaped, plate-type TPG, which was also composed of Fe and Al, was designed for realizing the higher power density at a small temperature differences. The volume of the T-shaped TPG was 1 / 4 compared with the previous one, and the power densities of the T-shaped TPG measured at the temperature difference of 20 to 60 K were over 2 time greater than that of the previous one.