Installation of metering equipment, technical management, namely, establishment and monitoring of operating parameters for the supply and delivery of fuels, maintenance and repair of products in the fields of electrical engineering, electronics, data processing, communications technology, optics and mechanical engineering, in addition to devices, apparatus and installations for the measurement and control of production, transport and consumption of energy, also of devices, apparatus and installations for building automation and of heating, ventilation and air conditioning installations and devices and apparatus for the control and regulation of such installations, also of devices, apparatus and installations for telecommunications and for the remote control, remote monitoring and remote management of telecommunications appliances, also of devices, apparatus and merchandise, and also of means of identification authorization and cash-free means of payment; installation, maintenance and repair of installations, apparatus and appliances in the field of energy management, energy customer management, determination of energy data and customer data, the energy market and the energy trade, energy reporting, energy billing and energy rating, calculation and billing of energy costs, calculation and billing of charges and the administration of energy customer processes