The supplier must be approved as a balance responsible party for either generation or demand in eastern or western Denmark, cf. market regulation C1, and must also have signed a 'Main agreement on the supply of ancillary services'. This option provides access to the delivery of all ancillary services.
The supplier must have signed an 'Agreement on the supply of balancing services without energy supplies'. This option provides access to the delivery of FCR in western Denmark, FFR in eastern Denmark and FCR-D in eastern Denmark – i.e. ancillary services with very limited energy supplies, which do not require that the supplier has a contract with a balance responsible party.