This knowledge base covers the three largest public electricity systems operating in Australia:

• The National Electricity Market: The interconnected power system spanning eastern and south-eastern Australia, where electricity is traded between generators and retailers in real time across a transmission network operated by AEMO. The NEM covers a population of over 20 million people and a peak demand of around 35 GW.    
• The Wholesale Electricity Market: The WEM operating on the SWIS is the main electricity network in Western Australia, a fully separate market with its own governance, rules and system operation arrangements. The SWIS supplies more than 2.4 million people, with peak demand of around 4 GW. Outside the SWIS, the remainder of WA is supplied by Horizon Power, which operates a series of isolated networks and microgrids under a non-contestable model.
• The Interim Northern Territory Electricity Market: The principal electricity market in the Northern Territory that facilitates the dispatch and settlement of electricity generation within the Darwin-Katherine power system. The I-NTEM covers a population of approximately 150,000 people and a peak demand of around 250 MW.

Much of regional Australia is supplied by stand-alone power systems (“microgrid”) that can operate to 10’s of MW. These can be privately or publicly owned and requirements for these systems are outside the scope of this knowledge base.

Governance arrangements

Since the 1990s, electricity market reform in Australia has focused on introducing competition, improving efficiency, and strengthening consumer protections. Although each jurisdiction follows similar structural principles, unbundling networks, independent rule-making, and regulated monopoly networks, the specific governance arrangements differ between the NEM, WEM and the I-NTEM.

Governance in the NEM

The establishment of the NEM in 1998 marked a major shift from vertically integrated state-owned utilities to competitive wholesale electricity market across participating states. Reforms have progressively unbundled generation, transmission, distribution, and retail functions, with independent rule makers and regulators.

Full retail competition exists in all NEM jurisdictions except for small customers in regional Queensland, where the Uniform Tariff Policy and government-owned Ergon Energy Retail limit contestability; however, large business customers in regional Queensland are already contestable, and the Queensland Government is progressing a staged expansion of competition for small customers.

Governance of the NEM is shared across federal and state & territories and key bodies include:

• The Energy & Climate Change Ministerial Council: The ECMC is the intergovernmental forum responsible for overseeing national energy policy and market reform in Australia. It comprises energy ministers from the Commonwealth, states, and territories, and provides strategic direction for the governance of the NEM and broader energy transition initiatives.
• Australian Energy Market Commission: The AEMC is the independent rule maker for Australia’s national energy markets. It is responsible for developing and maintaining the National Electricity Rules (NER) and National Energy Retail Rules (NERR), and for providing advice to governments on energy market development. The AEMC operates under the National Electricity Law (NEL) and is accountable to the ECMC.
• The Australian Energy Regulator: The AER is the regulator responsible for enforcing the NER and NERR, including regulating network revenues and retail markets in the NEM, and monitoring market performance and participant compliance.
• The Australian Energy Market Operator: AEMO is the operator of Australia’s electricity systems and markets, including the NEM and the WEM. It is responsible for system operations, market settlements, forecasting, planning, and emergency management.

Summary of the roles and relationship between key institutions in the NEM

While in the NEM, most economic regulation of electricity networks and retailing is undertaken by the AER, some jurisdictions retain responsibility for specific functions such as price regulation for certain customer classes, licensing of energy retailers or distributors, and compliance monitoring under state-based legislation.

National competition and consumer protection oversight is provided by the ACCC, while the AER provides regulatory oversight and compliance:

• The AER: regulates NEM networks and retail markets under the National Electricity and Retail Laws.
• The ACCC: investigates anti-competitive conduct, misleading claims and consumer protection breaches that fall outside the NERR. The ACCC has recently issued industry guidance for solar and battery suppliers on trade practices compliance and has granted conditional authorisation for a PKI solution to support secure utility-server communications.

Together, these institutions provide complementary economic, competition and consumer protections across NEM and non-NEM jurisdictions. Further information on electricity sector governance arrangements, and links to key legislative instruments, can be found on the AEMC website.

Governance in other jurisdictions

While Western Australia and the Northern Territory are not part of the NEM, each operates their own electricity market framework with independent governance institutions, regulatory settings and policy priorities.

The WEM, operating on the SWIS, is a fully separate electricity market with its own institutions, rule-making processes and operational arrangements. Governance responsibilities are distributed across several bodies:

• Energy Policy WA: EPWA oversee policy and rule development agency for the WEM. EPWA leads market design reforms, administers the WEM Rules, and provides strategic policy advice to the WA Government on electricity system transformation, decarbonisation and reliability settings.
• Economic Regulation Authority: The independent economic regulator for Western Australia. The ERA regulates network revenues for Western Power, oversees licensing of electricity retailers and generators, monitors compliance with the WEM Rules and ESMR; and enforces conduct and market behaviour obligations across the SWIS.
• AEMO: AEMO operates the WEM under contract to the WA Government. It is responsible for security-constrained economic dispatch, market settlement, system forecasting, and administering the WEM’s co-optimised energy and essential system services markets.
• Western Power: The government-owned transmission and distribution network service provider for the SWIS. Western Power plans, builds and operates the network, manages access and connection arrangements, and implements technical standards and dynamic operating envelopes for distribution-connected CER.
• Synergy: The government-owned retailer supplying small customers on the SWIS. Synergy also owns a generation portfolio and operates under ring-fencing requirements to separate its retail and generation activities.
• Retail contestability: Retail competition is available to large use customers, who may choose from several licensed retailers. Small-use customers remain non-contestable and must be supplied by Synergy under regulated tariff arrangements.

WA has implemented major reforms to modernise the WEM. These include the introduction of security-constrained economic dispatch, co-optimised energy, ESS, an updated RCM, and enhanced real-time operational visibility. These reforms align the WEM with contemporary international market design and support increasing levels of distributed energy resources and renewable generation.

The I-NTEM governs the operation of the Darwin–Katherine power system. Outside of the Darwin-Katherine, I-NTEM also governs smaller markets in Alice Springs and Tennant Creek. While significantly smaller than the NEM or WEM, the NT framework includes:

• Utilities Commission of the Northern Territory: The independent economic regulator for the NT electricity sector. The Commission regulates network revenues for Power and Water Corporation, oversees licensing of generation and retail businesses, monitors compliance with Codes and Guidelines, and advises the NT Government on electricity market performance and structural reform.
• Power and Water Corporation: The PWC is the government-owned corporation responsible for transmission and distribution network functions, network planning and power system control and operations (via ring-fenced business units).
• Jacana Energy: The government-owned retailer supplying most small customers in the Darwin–Katherine region. Jacana operates under regulated retail tariffs for small-use customers and competes for contestable large customers under the NT’s electricity supply licensing arrangements.
• Retail contestability: Retail competition is available to large customers whose annual consumption exceeds 750MWh p.a. small customers have limited contestability and are typically supplied by Jacana Energy at regulated tariffs.
• Market characteristics and priorities: The NT market focuses on maintaining system security in a small, partly islanded system with increasing solar penetration. Priorities include system strength, minimum and demand, integrating new technologies, and supporting private investment in utility-scale generation through clearer and more predictable market arrangements.

The National Electricity Objective

The NEO serves as the guiding principle for the governance and regulation of Australia’s electricity markets. It underpins the development and application of the NER and informs the decisions of the ECMC, AEMC, the AER and AEMO.

The NEO aims to promote efficient investment in, and operation and use of, electricity services for the long-term interests of consumers with respect to price, quality, safety, reliability, and security of supply.

Technical regulatory frameworks

Technical regulation generally sits with state and territory safety regulators with powers granted to DNSPs to determine standards for grid connection for electricity customers and generators. Jurisdictional technical regulators perform functions including enforcing standards compliance, licencing for electrical trades and inspections of electrical installations.

A summary of technical regulators by jurisdiction is provided below:

• Australian Capital Territory: Access Canberra
• New South Wales: Department of Customer Service
• Northern Territory: WorkSafe
• Queensland: Electrical Safety Office
• South Australia: Office of the Technical Regulator
• Tasmania: Department of Justice
• Victoria: Energy Safe Victoria
• Western Australia: Department of Mines, Industry Regulation and Safety

The ERAC coordinates electrical safety regulation across jurisdictions, working towards greater harmonisation in the development and application of relevant technical standards.