The topic of this paper is ancillary services in the distribution system. Ancillary services refer to the ability of system users to adjust their electricity consumption or production in response to an external signal. This includes the management of consumption, production, and energy storage. Ancillary services encompass system services within the distribution electrical network and the resolution of grid congestion. This paper explains the principle of operating the distribution system and defines both existing and new ancillary services in the distribution network. The technical conditions for providing ancillary services in the distribution system are also defined. Distributed energy resources can support the electrical distribution or transmission system if their services are coordinated through an aggregator. For these services to be considered ancillary services, they must be measured and evaluated according to a generally accepted methodology. Additionally, the costs and financial benefits associated with providing these services need to be determined in order to develop sustainable business models. The example of Slovenia is used to explain the model of a system for the registration and procurement of ancillary services in the distribution network.