An exhibition in Switzerland in 2001 presents a popularised definition of "energy slaves" based on the work carried out by Tourane Corbière-Nicollier under the supervision of Olivier Jolliet of the EPFL-GECOS laboratory in Lausanne. The definition given is ː "The energy slave is a unit of measurement that allows us to better understand and evaluate the consequences of our life choices. An energy slave works to produce energy 24 hours a day. He produces an average power output of 100 W (875 kWh/year)."