1. A method for assisting with maintenance management of a power network, the method comprising: determining a set of power network components being likely to fail; determining a condition of each power network component; determining a reliability parameter corresponding to each power network component; determining an impact on the power network of a failure of each power network component; and determining, for each power network component, a risk value based on the impact on the power network of the power network component failure and determining a corresponding probability of power network component failure based on the reliability parameter and the condition of the power network component.