Definition: Powerlink Queensland, formally known as the Queensland Electricity Transmission Corporation, is the Queensland Government-owned corporation responsible for planning, building, operating, and maintaining the high-voltage electricity transmission network that carries electricity across Queensland. As the state’s sole transmission network service provider (TNSP), Powerlink plays a central role in connecting electricity generators to distributors and large industrial customers, underpinning the reliability and security of Queensland’s electricity supply.
What Does Powerlink Queensland Do?
Powerlink operates at the highest voltage levels of Queensland’s electricity system — the “highways” of the grid that carry bulk electricity over long distances from power stations and renewable energy generators to regional distribution networks and large industrial customers.
Its core responsibilities include:
- Transmission network operation — managing the real-time flow of electricity across Queensland’s high-voltage network, 24 hours a day, 365 days a year
- Network planning — forecasting future electricity demand and generation patterns and planning the network augmentations needed to maintain reliability and security
- Capital investment — designing, procuring, and constructing new transmission infrastructure including lines, cables, substations, and associated equipment
- Asset management — maintaining and replacing ageing network assets to sustain performance and safety across a network that spans thousands of kilometres
- Market participation — operating within the National Electricity Market (NEM) framework as a regulated network service provider, subject to oversight by the Australian Energy Regulator (AER)
- Connection services — facilitating the connection of new generators, including renewable energy projects, to the transmission network
Powerlink’s Network
Powerlink’s transmission network is one of the largest in Australia, spanning approximately 15,000 circuit kilometres of high-voltage transmission lines and 130 substations across Queensland. The network operates at voltages of 110kV, 132kV, 275kV, and 330kV, carrying electricity from generators in regional Queensland to the load centres of South East Queensland and to major industrial customers such as mines and smelters in the state’s north and west.
Powerlink’s network connects to the NEM through interconnectors with New South Wales, allowing electricity to flow between Queensland and the southern states depending on supply and demand conditions.
Powerlink as a Government-Owned Corporation
Powerlink is a Queensland Government-owned corporation (GOC), meaning it is wholly owned by the Queensland Government but operates on a commercial basis. It is governed by a board of directors and operates under the Government Owned Corporations Act 1993 (Qld) and the Electricity Act 1994 (Qld).
As a regulated monopoly, Powerlink’s revenues are determined through a regulatory process administered by the Australian Energy Regulator (AER) under the National Electricity Rules. Every five years, the AER sets the maximum revenue Powerlink is allowed to earn from its regulated transmission services — a process known as the revenue determination or transmission determination. This regulatory framework ensures that Powerlink’s charges to electricity users remain fair and transparent.
Powerlink and the National Electricity Market (NEM)
As Queensland’s TNSP, Powerlink is a registered participant in the National Electricity Market — the interconnected electricity market covering Queensland, New South Wales, Victoria, South Australia, Tasmania, and the Australian Capital Territory. Within the NEM framework, Powerlink’s role is to provide open, non-discriminatory access to its transmission network for all registered generators and market customers.
Powerlink works closely with the Australian Energy Market Operator (AEMO) — the body responsible for operating and planning the NEM — to ensure Queensland’s transmission network meets the reliability and security standards required under the National Electricity Rules.
Powerlink and the Energy Transition
As Australia’s energy system transitions away from coal-fired generation toward renewable energy, Powerlink faces one of the most significant periods of network transformation in its history. Key challenges and priorities include:
- Integrating large-scale renewable energy — connecting new solar, wind, and battery storage projects to the transmission network as coal plants retire
- Managing system strength — maintaining the technical stability of the power system as synchronous coal generators are replaced by inverter-based renewable technologies
- Network augmentation — building new transmission infrastructure to support Queensland’s Renewable Energy Zones (REZs) and the state’s target of 80% renewable energy by 2035
- CopperString 2032 — developing the landmark ~1,000 km transmission project connecting the North West Minerals Province to the NEM, one of the largest infrastructure investments in Queensland’s history
Real-World Example: CopperString 2032
Powerlink Queensland is the proponent of the CopperString 2032 Project — a proposed ~1,000 km high-voltage transmission line connecting the isolated North West Minerals Province to the NEM. As the project proponent, Powerlink was responsible for:
- Preparing and submitting the Initial Advice Statement (IAS) in February 2019
- Engaging with the Coordinator-General throughout the EIS process
- Preparing the Draft EIS, Revised Draft EIS, and Final EIS over a period of more than two years
- Applying for the federal controlled action approval under the EPBC Act
- Submitting project change applications following the Coordinator-General’s approval in September 2022
The CopperString project — valued at approximately $5 billion — represents the single largest transmission investment in Powerlink’s history and one of the most complex infrastructure approvals processes in Queensland.
Key Takeaway
Powerlink Queensland is the backbone of Queensland’s electricity transmission system — and, as the energy transition accelerates, one of the most consequential infrastructure organisations in the state. Its role as both network operator and major project proponent (through CopperString 2032) makes it a central actor in Queensland’s journey toward a cleaner, more reliable, and more connected electricity future.
Published on energyplanning.com.au | Energy Planning Glossary
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