As shown in this diagram here, there are a number of different types of Demand Response which are dispatchable by various third parties, which might be (in the context of the NEM):
1) The the Australian Energy Market Operator (AEMO); or
2) The local network company; or
3) The energy user’s retailer; or
4) A Demand Response Aggregator.
Please click on the relevant sub-category in the diagram below to further explore more detail about the mechanism of particular interest: