Method for the location-independent purchase of electrical energy from a mobile consumption unit at a stationary electricity filling station, where - the mobile consumption unit is equipped with at least one cooling and/or heating device, - a unique ID number is assigned to the consumption unit, - the electricity filling station carries an electricity meter with a meter number and at least the following process steps are executed: - establishing a first communication link between the mobile consumption unit and the electricity filling station; - Transmission of a data packet containing at least the identification number and the meter number via a second communication link to a billing server; - Assignment of the consumption unit using the identification number to an electricity supplier and assignment of the electricity meter using the meter number to a distribution network operator using the data stored on the billing server for this purpose; - Activation of the electricity filling station after successful assignment on the billing server; - delivery of electrical energy from the electric charging station to the cooling and/or heating device of the consumption unit via a charging cable or via a contact-free transmission of electrical energy, the at least one cooling and/or heating device being operated with electrical energy from the electric charging station without an accumulator being connected in between; and - Transmission of the quantity of electrical energy taken from the consumption unit at the electricity filling station via the communication link to the billing server, - wherein a separate computer unit is connected via a communication link K3 to the electric charging station and the electrical energy is delivered from the electric charging station to the cooling and/or heating device in accordance with controlled variables which are stored on the separate computer unit; and - the technical control variables of the cooling and/or heating device being stored in a suitable memory of the consumption unit or being transmitted via the communication connections K1 and K3. - the mobile consumption unit is equipped with at least one cooling and/or heating device, - a unique ID number is assigned to the consumption unit, - the electricity filling station carries an electricity meter with a meter number - establishing a first communication link between the mobile consumption unit and the electricity filling station; - Transmission of a data packet containing at least the identification number and the meter number via a second communication link to a billing server; - Assignment of the consumption unit using the identification number to an electricity supplier and assignment of the electricity meter using the meter number to a distribution network operator using the data stored on the billing server for this purpose; - Activation of the electricity filling station after successful assignment on the billing server; - delivery of electrical energy from the electric charging station to the cooling and/or heating device of the consumption unit via a charging cable or via a contact-free transmission of electrical energy, the at least one cooling and/or heating device being operated with electrical energy from the electric charging station without an accumulator being connected in between; and - Transmission of the quantity of electrical energy taken from the consumption unit at the electricity filling station via the communication link to the billing server, - wherein a separate computer unit is connected via a communication link K3 to the electric charging station and the electrical energy is delivered from the electric charging station to the cooling and/or heating device in accordance with controlled variables which are stored on the separate computer unit; and - the technical control variables of the cooling and/or heating device being stored in a suitable memory of the consumption unit or being transmitted via the communication connections K1 and K3.