(WO9825320-A1)      The method includes supplying a fuel to a burner for generating a temperature differential across a thermoelectric element generating electricity for secondary power. A second fuel is preheated, the pre-heating comprising primary heat.    The second fuel is supplied to a fuel cell stack for generating electricity for primary power and secondary heat. The method also includes a step of cooling one side of the thermoelectric element to increase the temperature differential.    USE -   The method could be used for unattended communication repeaters, navigational aids and weather and oceanographic stations.    ADVANTAGE -   Combines fuel cell, thermoelectric generator and catalytic burner.    (EP947029-A1)      The method includes supplying a fuel to a burner for generating a temperature differential across a thermoelectric element generating electricity for secondary power. A second fuel is preheated, the pre-heating comprising primary heat.    The second fuel is supplied to a fuel cell stack for generating electricity for primary power and secondary heat. The method also includes a step of cooling one side of the thermoelectric element to increase the temperature differential.    USE -   The method could be used for unattended communication repeaters, navigational aids and weather and oceanographic stations.    ADVANTAGE -   Combines fuel cell, thermoelectric generator and catalytic burner.    (JP2001504980-W)      The method includes supplying a fuel to a burner for generating a temperature differential across a thermoelectric element generating electricity for secondary power. A second fuel is preheated, the pre-heating comprising primary heat.    The second fuel is supplied to a fuel cell stack for generating electricity for primary power and secondary heat. The method also includes a step of cooling one side of the thermoelectric element to increase the temperature differential.    USE -   The method could be used for unattended communication repeaters, navigational aids and weather and oceanographic stations.    ADVANTAGE -   Combines fuel cell, thermoelectric generator and catalytic burner.