Summary: The Independent Distribution System Operator (IDSO) framework features a single central market platform and a number of local market platforms.<br/>IDSOs organise and operate local market platforms to procure distribution network support and control ancillary services to solve distribution network constraints as a potential alternative to traditional investment. DNSPs continue to build, maintain and operate the physical infrastructure of the distribution network and actively exchange information with IDSOs to develop distribution network constraints.<br/>AMEO organises and operates the central market platform comprising of wholesale energy and select ancillary services markets (i.e. frequency control ancillary services, transmission network control and control ancillary services).<br/>Distributed Energy Resources can participate in the central or local markets via an aggregator and/or energy retailer to provide wholesale energy and/or ancillary services. DER bids for the central market are prequalified and aggregated by the local platform to take account of distribution network constraints.<br/>