The present invention relates to the field of electric power networks, and it is more specifically concerned with a method for determining current sensitivity coefficients between several measuring nodes and selected branches in an electric power network without the knowledge of the network parameters. This method may be described as model-less or model-free since no data relating to network parameters needs to be used. In particular, the present invention should preferably be implemented in the form of a unified method for determining both current and voltage sensitivity coefficients. In this method, some or all of the power network nodes are measurement nodes equipped with metering units. The determined current sensitivity coefficients demonstrate the important behavior and characteristics of the power network which can be further used for the power network analysis, identification, operation, and control.