  This paper presents a new device able to turn thermal gradients into
electricity by using a bimetal-based heat engine coupled to an electrostatic
converter. A two-steps conversion is performed: (i) a curved bimetallic strip
turns the thermal gradient into a mechanical movement (thermal-to-mechanical
conversion) that is (ii) then converted into electricity thanks to an
electret-based electrostatic converter (mechanical-to-electrical conversion).
An output power up to 5.5uW on a hot source at 50{\deg}C has already been
reached, validating this new concept.
