Thermoelectric modules are used for production of electricity by direct conversion of heat into electricity. When the thermoelectric module connected to the electrical circuit is heated, electricity is generated. Thermoelectric generator modules (TGM) possess this quality. The combination of one or more TE modules and two air or liquid heat exchangers that are connected to the hot and cold sides of the modules into the base thermoelectric units (BTU) makes it possible to construct a thermoelectric system with a predetermined power.