The invention relates to a method in connection with electrical-energy measurement. According to the method the electrical energy consumption (1) of a building is measured, and the measured data are sent over telecommunications link (2) to the desired party. According to the invention RFID devices (3, 13, 15) are used to produce and read information on the building, an energy meter (1) and its telecommunications links (2) are used to forward the RFID-based building information.