Abstract: An operating site (1) with an electricity/heat generator (2, 3) which functions on a combustion basis, the waste heat of which generator is to some extent used to heat the operating site (1), wherein the operating site further has at least one thermal treatment chamber (20-25) for the subjecting of products arranged therein to heat and is set up for the exhaust gas of the electricity/heat generator (2, 3) to flow directly through the at least one thermal treatment chamber (20-25). In this case, at least one additional heater (26-32) which functions on a combustion basis for heating of the treatment chamber (20-25) is provided and the exhaust gas which flows through the thermal treatment chamber (20-25) and the exhaust gas of the at least one additional heater (26-32) can be fed to a common post treatment.