We investigate the effects of the Covid-19 pandemic on energy use and emissions in the Swiss transport sector, both in the short and in the long run. The short-run effects will be estimated by means of an existing panel for which we have been tracking individual mobility behaviour since September 2019 and thus have a history spanning the onset of the pandemic. To examine the long-term effects we will carry out a stated choice experiment with a new sample of participants, in which we will estimate likely changes in mobility tool ownership (e.g., ownership of a car or a public transportation pass) as a function of infection rates and the possibility to work from home in the future. The change in mobility tool ownership in different scenarios will be used to compute the long-term changes in energy use and emissions in the transport sector.