This Standard describes key concepts, and lists terms and definitions relating to smart electricity grids, in the Australian context. The definitions have been sourced, in order of priority, from published Australian regulations or Standards, from International Electrotechnical Commission (IEC) Standards and documents, and then other documents. This Standard is intended to be referenced by other Australian Standards relating to the construction, operation and assessment of smart grids.Section 2 of this Standard describes key concepts and attributes of smart grids.Section 3 contains definitions describing the relationships between energy suppliers, energy users and other entities involved in the operation of smart grids. These are called transactional and operational terms. Many of these relationships are also present in conventional grids, but require clarification in the smart grid context, or need to be included for completeness (e.g. because they have an accepted definition in the National Electricity Rules or to contrast with the use of the same term in a smart grid context).Section 4 contains definitions related to the technology of the smart grid, or the relationships between its physical elements and communications systems. These are called technical terms.Section 5 contains general terms that have specific meanings in the context of this Standard (e.g. ‘person’).The Bibliography lists Standards and other documents found to be of particular value in the preparation of this Standard, but not explicitly referenced in the text.Figure 1 illustrates the notional relationships between the concepts and technologies defined in Sections 3 and 4 of this Standard.