Tenneco's advances in exhaust heat recovery technologies include thermoelectric generators (TEGs) and Rankine systems for powering electrical accessories, recharging batteries and supporting vehicle propulsion without reducing engine performance. Tenneco reckons that the same trends that are causing the vehicle powertrain to become electrified are indeed causing its after-treatment systems to become electrified. Matthew Beecham spoke to Marcel Womann, Supervisor, Advanced Cold End Products, Advanced Engineering, Tenneco Clean Air Division about TEGs.