ABSTRACT Thermoelectric generators (TEG) produce electric power from exhaust waste heat and support the battery charging of Hybrid Electric Vehicles (HEV), resulting in fuel efficiency improvements. During the Hi-CEPS EU Project, the potential of TEGs for HEV is evaluated. A detailed model of a TEG is developed and experimentally validated. A reduced model is implemented in a detailed HEV simulator developed under the LMS.IMAGINE.Lab AMESim® platform to investigate thermal engine warm up. Using the models validated, simulations are achieved for different driving cycles and ambient temperatures. Based on the results, the relevance of TEG technology is assessed, notably for gasoline engine applications.