A method and system for controlling temperature in an exhaust gas routing system of an internal combustion engine is provided. The exhaust gas routing system includes an exhaust gas manifold, an exhaust gas turbine which includes an electric machine arranged downstream of the exhaust gas manifold in the exhaust gas stream, an aftertreatment system arranged downstream of the exhaust gas turbine, and a control means configured to control the operation of the electric machine to adapt an operating mode of the exhaust gas turbine between motor operating, regeneration operating and neutral operating modes control means (50) such that the temperature of the aftertreatment system is controlled based on a target temperature.