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Our infrastructure

We deliver critical infrastructure and transmission services, connecting Queenslanders to a world-class energy future.

Our transmission network extends 1,700km from north of Cairns to the New South Wales border, and comprises 15,559 circuit kilometres of transmission lines and 154 substations.

What is a substation?

Substation

The role of a substation is to monitor and control the flow, stability, quality and voltage of electricity on the transmission lines connected to the facility. Equipment located within the substation is used to transform the voltage of electricity, protect the network, measure the flow of the electricity, and switch electricity between the different transmission lines and transformers on the grid. A substation is not a power station – it does not generate electricity.

What is a transmission line?

Transmission line

A transmission line is a powerline which is capable of carrying large amounts of electricity at high voltages. Transmission lines are larger and taller than the everyday distribution powerlines which deliver electricity to your home and business. Transmission lines are normally built on tall steel towers or concrete and steel poles.

 

Energy explainers

Queensland's transmission network

How Powerlink fits into the electricity supply chain

 

What is system strength 

System strength is the transmission network’s ability to maintain stable voltage both during normal operation and when there is a disturbance, like a sudden change in generation or load, or an unexpected electrical fault. 

The Australian Energy Market Operator (AEMO) determines the standards for system strength. As Queensland’s System Strength Service Provider, Powerlink must deliver what is needed to meet those minimum standards. 

Queensland’s electricity has historically been generated by large coal-fired, gas-fired and hydroelectric power stations. These power stations use spinning generators to produce energy and stabilise the electricity network, providing system strength. 

As the electricity generation mix in Queensland evolves, including the eventual retirement of coal-fired generation, system strength will need to be provided by a range of other sources, including synchronous condensers. 

Emergencies

1800 353 031

Report fallen powerlines or network damage 24 hours, 7 days a week

General Enquiries

1800 635 369
07 3860 2111

Monday to Friday 7:30am - 5:00pm

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