The Substation busbar or transmission line starting point, where facilities used by different coordinated parties are interconnected, or facilities that, although they are used by the same coordinated party, are in different facility categories (see term “coordinated party”). A power plant connection point to a transmission network is the high-voltage busbar of its power transformers. Unregulated and regulated customers’ connection point to the transmission network is the relevant consumption busbar. Consumption busbars are high-voltage busbars less than or equal to 23 [kV] of the secondary side power transformers connected to the transmission network and whose primary voltage is higher than 23 [kV].