In such cases, the customers can engage in bilateral trade on the secondary market. Shippers can announce their wish to buy or sell capacity, balance margin or gas on Energinet.dk’s bulletin board. The bulletin board is a web-based meeting site - much like a free-ads site. The actual secondary trade in capacity and balance margin is executed in accordance with the respective agreements on ”Capacity Transfer Facility” (CTF) and ”Balance Transfer Facility” (BTF).
 
Sale of excess capacity or purchase of lacking capacity via the CTF
On the secondary market, shippers can trade in capacity and emergency supply for periods of one year down to a single day via Energinet.dk’s Capacity Transfer Facility (CTF).

Sale of excess balance margin or purchase of lacking balance margin via the BTF
As an alternative to concluding a balancing service agreement, shippers can use Energinet.dk's Balance Transfer Facility (BTF) to buy or sell balance margin on the secondary market.