The regulation that is called market coupling in European jargon is a logical expansion of the EU regulatory reform that has been going on for over a decade now, an essential concept of which has been the so called “unbundling” policy. Unbun- dling has prescribed the complete separation of network operation and energy production and trade, expecting the intensification of market competition for potentially competing activities. Within the market model based on the unbundling concept network access can be purchased from the transmission system operators in the form of physical transmission capacity utilisation rights.