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| South West Interconnected System | |
|---|---|
| Name | South West Interconnected System |
| Country | Australia |
| State | Western Australia |
| Type | Electrical grid |
| Operator | Western Power; Australian Energy Market Operator |
| Area | South West Western Australia |
| Peak demand | ~5,000 MW |
| Established | 1940s–1960s |
South West Interconnected System
The South West Interconnected System is the principal high-voltage electricity network serving Perth and the south-west region of Western Australia. It interconnects major generation sites, transmission corridors, distribution networks and large industrial consumers across Western Australia, coordinating operations among entities such as Western Power, Horizon Power, Synergy (company), Verve Energy and the Australian Energy Market Operator. The network supports metropolitan, regional and mining-sector demand and links to infrastructure projects including many wind, solar and thermal facilities.
The system covers the Perth metropolitan area, the Southwest, the Wheatbelt, the Goldfields–Esperance region and connects to towns served by Albany, Bunbury, Geraldton, Kalgoorlie, Esperance and Karratha corridors. Major participants include generators like Alinta Energy, Engie SA (Australia), EnergyAustralia, Origin Energy and renewables developers such as Windlab and Infigen Energy. Transmission and distribution are managed by entities including Western Power and grid planning involves organisations like the Australian Energy Market Commission and the Australian Energy Regulator. The system interacts with federal initiatives such as the National Electricity Market debate and state instruments like the Renewable Energy Target and Western Australian energy policies.
Origins trace to early 20th-century supply schemes linked to projects like the Goldfields Water Supply Scheme and post-war industrialisation tied to mining booms in the Pilbara and Goldfields. Expansion accelerated alongside projects by corporations including BHP and Rio Tinto and infrastructure investments influenced by events such as the 1973 oil crisis and shifts in policy under premiers like Geoff Gallop and Colin Barnett. Deregulation, corporatisation and the creation of market participants followed models influenced by reforms in New South Wales and Victoria, while local electricity restructuring involved entities such as Synergy (company) and state-owned enterprises. Integration of gas-fired combined-cycle plants reflected partnerships with companies like Woodside Petroleum and Chevron amid developments in the North West Shelf project.
Generation assets include coal, gas, diesel, hydro, wind and solar plants operated by firms like Alinta Energy, AGL Energy, Origin Energy and independent power producers such as Infigen Energy. Notable facilities and projects associated with the network include thermal plants similar in scale to Muja Power Station and Kwinana Power Station, gas fields tied to the North West Shelf, and renewable hubs developed near Geraldton, Collie and the Wheatbelt. Grid-scale battery energy storage projects, involving companies like Tesla, Inc. and Fluence, support frequency control and ancillary services comparable to installations in South Australia. Transmission assets include 330 kV and 220 kV lines, substations at nodes referenced by operators and interconnection points for large consumers such as mining operations by Fortescue Metals Group, BHP, and Rio Tinto.
Network operations are coordinated with contingency planning and dispatch systems influenced by practices at the Australian Energy Market Operator and standards from bodies like Standards Australia. Real-time control rooms manage load, voltage and frequency, utilising SCADA and EMS platforms supplied by firms such as Siemens and ABB. Transmission corridors traverse landscapes managed by agencies including the Department of Mines, Industry Regulation and Safety (Western Australia) and environmental approvals interact with processes overseen by the Environmental Protection Authority (Western Australia), particularly for lines traversing conservation areas like those near Leeuwin-Naturaliste National Park.
The market involves retail and wholesale participants including Synergy (company), Alinta Energy and retail licensees from national players such as Origin Energy and EnergyAustralia. Regulation is enacted by the Economic Regulation Authority (Western Australia), with policy advice from the Public Utilities Office (Western Australia) and interface with national institutions like the Australian Energy Market Commission and the Australian Energy Regulator. Tariff structures, network access, and connection agreements are subject to proceedings similar to rule changes in markets such as Victoria and New South Wales, while capacity procurement and ancillary services use competitive tendering influenced by procurement in places like South Australia.
Reliability planning addresses extreme heat events, cyclone impacts in the north, and bushfire risks, coordinating with agencies such as the Bureau of Meteorology, Department of Fire and Emergency Services (Western Australia), and local governments in regions including Peel, Wheatbelt and Great Southern. Black start capability, system restoration and contingency reserves are maintained through agreements with generators and operators like Verve Energy and private operators. Cybersecurity standards and incident response align with frameworks from the Australian Cyber Security Centre and national critical infrastructure directives shaped after events affecting grids in South Australia and internationally in California.
Planned investments include large-scale solar farms near Cunderdin and Morawa, expanded wind capacity around Albany and Geraldton, and grid-scale storage projects proposed by developers like AGL Energy and multinational investors including Macquarie Group. Transmission augmentation proposals involve new high-voltage lines, battery hubs, and potential hydrogen production facilities linked to projects by Fortescue Metals Group and Woodside Petroleum. Policy drivers include state renewable targets, federal initiatives such as the Technology Investment Roadmap, and international finance from institutions like the World Bank and Asian Development Bank, while stakeholder engagement involves traditional owner groups, local councils and conservation organisations including Trust for Nature.
Category:Electric power infrastructure in Western Australia