[Smart Energy Technologies(wireless power transmission, smart meters)]
Portable power generation units composed of an oxide thermoelectric module, which shows outstanding oxidation resistance and contains no toxic nor rare elements have been developed. Water circulation and batteries for air cooling are unnecessary for thermoelectric conversion. The units can generate 2-5 W using heat energy with temperature of 200-800 ℃. Since no moving nor high pressure parts are included, the thermoelectric units can be used safely and simply. No onerous installation nor changing batteries are needed and maintenance cost should be low. Lighting, sensing, filming, and transmitting data without cables by thermoelectric conversion using waste heat from industrial furnaces, incinerators, engines of automobiles and ships are possible. Electrical power can be generated by combustion of firewood for emergency power sources. The air cooling thermoelectric units can contribute not only to spread the IoT technology, but also overcome the energy and CO2 problems by the waste heat recovery.