System for energy management of household appliances, which are networked together by means of a wireless local network, wherein among the household appliances at least one long-distance household appliance is provided which is located in a detached part of a building for which the energy management is provided, so that wireless communication by means of the wireless local network is not possible, characterised in that - the system has a building-related unit for energy management and furthermore an activation circuit, which can be actuated by a short-term radio connection that can be triggered by the building-related unit, and thus can be shifted into an active state, - and also, in the active state, the long-distance household appliance can be actuated by at least one system-related energy management via a mobile radio connection (13; 23, 24, 25) with a data communication module on the basis of the LTE/4G mobile radio standard in the 800 MHz band range; - and the short-term radio connection is active at least in relation to the building, wherein the short-term radio connection is provided in the 868/915 MHz frequency band, and - the short-term radio connection is configured to act on a battery-fed receiver assigned to the long-distance household appliance such that the data communication module can be connected together with the long-distance household appliance, wherein - the activation circuit, when activated in the long-distance household appliance, indirectly connects the data communication module on the basis of the LTE/4G mobile radio standard and in particular it is provided that all control and monitoring procedures in the long-distance household appliance can be carried out via said data communication module, wherein - the building-related unit for energy management is in a master-client relationship with a virtual energy management unit, wherein the virtual unit can be embodied by a server on the Internet, wherein - the mobile radio connection (13; 24) has an access point or node, and wherein - a local Internet access router is connected to the access point via a microcell. - the system has a building-related unit for energy management and furthermore an activation circuit, which can be actuated by a short-term radio connection that can be triggered by the building-related unit, and thus can be shifted into an active state, - and also, in the active state, the long-distance household appliance can be actuated by at least one system-related energy management via a mobile radio connection (13; 23, 24, 25) with a data communication module on the basis of the LTE/4G mobile radio standard in the 800 MHz band range; - and the short-term radio connection is active at least in relation to the building, wherein the short-term radio connection is provided in the 868/915 MHz frequency band, and - the short-term radio connection is configured to act on a battery-fed receiver assigned to the long-distance household appliance such that the data communication module can be connected together with the long-distance household appliance, wherein - the activation circuit, when activated in the long-distance household appliance, indirectly connects the data communication module on the basis of the LTE/4G mobile radio standard and in particular it is provided that all control and monitoring procedures in the long-distance household appliance can be carried out via said data communication module, wherein - the building-related unit for energy management is in a master-client relationship with a virtual energy management unit, wherein the virtual unit can be embodied by a server on the Internet, wherein - the mobile radio connection (13; 24) has an access point or node, and wherein - a local Internet access router is connected to the access point via a microcell.