GOPACS is not a market platform, but it uses orders on existing electricity market platforms. ETPA is the first market platform that has joined GOPACS. Participating parties trade electricity by placing buy orders and sell orders on the ETPA market platform. GOPACS quickly calculates if the order meets the following conditions: 1. It solves the congestion situation. 2. It does aggravate congestion elsewhere in the electricity grid. In the event of a price difference between the buy order and a sell order, the grid operators pay the price difference (the spread), bringing about a match between the orders on the market platform. Result: the congestion is solved.