About the supply obligation
The supply obligation stipulates that the natural gas companies have a duty to supply gas to the consumers who do not already have a supply agreement. For example, this could be newcomers, customers where the supplier has disconnected the supply because the customer is in arrears and customers whose supplier has gone bankrupt.
The price of supply obligation gas corresponds to the market price plus an additional fee. It is precisely this additional fee which was the focal point for the tender round.