Western Australia’s SWIS Growth: What It Means for Switchgear, Transformers, and Substation Planning

Western Australia’s South West Interconnected System is entering a major growth phase. The SWIS supplies WA’s main electricity market and supports a large part of the state’s population, commercial activity, industrial load, mining-related infrastructure, and renewable energy development.

For utilities, mining operators, industrial facilities, infrastructure developers, renewable energy proponents, EPC contractors, and consultants, this growth has a clear implication: substation equipment WA planning needs to become earlier, more technical, and more lifecycle-focused.

AEMO’s 2026 Wholesale Electricity Market Electricity Statement of Opportunities states that SWIS demand is expected to rise by more than 50% over the 10-year outlook as population growth continues and homes and businesses increasingly electrify. At the same time, WA Government planning has highlighted the scale of long-term industrial demand, transmission augmentation, renewable generation, and storage required to support the state’s decarbonisation and economic growth objectives.

This article explains what SWIS electricity demand growth means for transformer capacity, switchgear reliability, substation planning, and grid equipment procurement across Western Australia.

Why SWIS Growth Matters for WA’s Electrical Infrastructure

The Western Australia grid is not growing for one reason alone. Demand is being shaped by several overlapping drivers:

• Population growth

• Commercial and residential electrification

• Industrial decarbonisation

• Mining and mineral processing demand

• Renewable energy connection

• Battery energy storage

• EV charging infrastructure

• Data centres and critical facilities

• Network reinforcement and replacement of ageing assets

The WA Government’s SWIS Demand Assessment was designed to understand future low-emissions electricity demand and the network, generation, and storage infrastructure required to support it. It considered existing industrial users and potential new industries such as hydrogen and critical minerals.

For project teams, this means grid planning can no longer focus only on immediate connection capacity. Transformers, switchgear, protection systems, metering, earthing, power quality equipment, and control systems must be specified with future demand, reliability, maintainability, and network integration in mind.

SWIS Electricity Demand Is Moving Beyond Business-as-Usual

AEMO’s 2026 WEM ESOO points to a stronger near-term outlook, supported by new generation and storage, distributed energy resources, household batteries, and virtual power plants. More than 1,000 MW of new generation and storage is expected to be progressively delivered by 2030-31, while coordinated household batteries are forecast to reduce evening peak demand by 200 MW in 2028-29.

However, the same outlook also shows that demand growth remains significant. AEMO expects SWIS demand to rise more than 50% over the 10-year outlook.

For equipment planning, this creates a dual challenge. The system needs more generation, storage, and demand-side flexibility, but it also needs the physical infrastructure to connect, transform, protect, and distribute power reliably.

That is where transformers, MV switchgear, HV switchgear, protection relays, capacitor banks, and substation systems become strategic assets.

Transmission Growth Will Drive Substation Equipment Demand

WA’s energy transition depends heavily on transmission capacity. Renewable generation is often located away from major load centres, while industrial demand may grow in areas where the existing network was not originally designed for large-scale electrification.

Western Power’s Clean Energy Link Program states that the transmission network plays a critical role in carrying wind and solar energy from where it is generated to where it is needed. It also notes that as demand for cleaner electricity grows and coal-fired generation retires, the network must be strengthened and expanded.

The Clean Energy Link - North project is a clear example. Western Power says the project includes high-capacity transmission lines, terminals, substations, and transformers along a 354-kilometre corridor from Northern Terminal in Malaga to Three Springs. It is expected to double capacity in some sections of the SWIS and support the connection and delivery of more renewable energy.

This type of network expansion directly increases demand for:

• Power transformers

• High voltage switchgear

• Medium voltage switchgear

• Substation transformers

• Instrument transformers

• Protection and control panels

• SCADA and communication equipment

• Earthing systems

• Reactive power and power quality equipment

• Substation civil and electrical balance of plant

For procurement teams, the message is clear: long-lead electrical equipment must be planned early, not after final design approval.

Transformer Capacity Becomes a Planning Priority

As the SWIS grows, transformer capacity becomes one of the most important planning constraints. Transformers are required at every level of the power system: generation connection, transmission substations, distribution substations, industrial facilities, renewable projects, mining operations, and commercial infrastructure.

For WA projects, transformer planning should consider:

• Present load and future load growth

• MVA or kVA rating

• Primary and secondary voltage

• Impedance and fault level impact

• Cooling method

• Ambient temperature and site derating

• Losses and efficiency

• Noise limits

• Tap changer requirements

• Oil type or dry type design

• Transport and installation access

• Monitoring accessories

• Maintenance strategy

• Spare parts and service support

Leistung Energie’s power transformer range is designed for demanding applications and complies with AS2374. The range includes transformers with voltage insulation ratings up to 500 kV and applications up to 500 MVA for power generation, electric utilities, mining, oil and gas, water and wastewater, and other sectors.

In a fast-growing grid, transformer procurement should be aligned with network studies, load flow analysis, protection coordination, transport constraints, and energisation milestones. A transformer that is technically acceptable today may become a bottleneck if future industrial load, renewable export, or distribution growth is not considered.

Distribution Transformers Will Also Matter

SWIS growth is not only a transmission issue. Distribution-level growth will affect commercial buildings, industrial estates, infrastructure corridors, mining-related facilities, EV charging sites, residential developments, and local renewable connections.

Distribution transformers must support:

• Higher load density

• Electrified commercial facilities

• EV charger clusters

• Local solar and battery integration

• Industrial process electrification

• Higher ambient temperatures

• Demand variability

• Reliability expectations

• Safety and fire-risk requirements

Leistung Energie’s distribution transformer category includes both oil type transformers and dry type transformers, giving project teams options for outdoor utility-style installations and indoor commercial or infrastructure applications.

For WA facilities, transformer selection should not be based only on purchase price. The correct decision depends on installation environment, fire risk, maintenance access, load profile, losses, cooling, and total cost of ownership.

Switchgear Reliability Matters More as Networks Grow

As the Western Australia grid expands, switchgear reliability becomes critical. Switchgear provides switching, isolation, fault interruption, protection interface, and safe operation across substations and facilities.

In SWIS-related projects, MV and HV switchgear must be specified for:

• Rated voltage

• Continuous current

• Short-circuit withstand current

• Internal arc classification

• Circuit breaker duty

• Busbar arrangement

• Protection relay requirements

• CT and VT specifications

• Cable entry and termination

• SCADA interface

• Local and remote control

• Interlocking philosophy

• Indoor or outdoor installation

• Environmental exposure

• Future feeder extension

• Maintenance and spare parts availability

Leistung Energie’s MV switchgear range covers medium voltage switchgear up to 40 kV, including air-insulated switchgear, gas-insulated switchgear, Enerswit+, and SF6-free Airing options.

For growing WA networks, switchgear selection should consider not only electrical ratings but also operator safety, internal arc performance, footprint, accessibility, cable termination space, environmental resilience, and lifecycle support.

Substation Planning Must Start Earlier

Substation planning is where demand growth, network constraints, renewable connection, industrial load, and procurement realities meet.

A well-planned substation package should define:

• Incoming and outgoing voltage levels

• Transformer rating and configuration

• MV and HV switchgear arrangement

• Busbar layout

• Protection and control philosophy

• Earthing system

• Cable routing

• SCADA and communications

• Metering requirements

• Fault level and short-circuit rating

• Arc flash and internal arc safety

• Civil layout and access

• Fire separation and containment

• Environmental conditions

• Expansion allowance

• Testing and commissioning requirements

Western Power’s Transmission System Plan and Network Opportunity Map are intended to outline challenges, opportunities, and proposed network development plans across the SWIS, including power system security and reliability considerations. This reinforces the need for project teams to treat substation equipment planning as an integrated engineering task, not a late-stage procurement exercise.

Mining and Industrial Facilities Need Future-Ready Electrical Design

WA’s mining and industrial sectors are central to SWIS demand growth. Electrification, processing expansion, hydrogen, critical minerals, battery manufacturing, and industrial decarbonisation can all increase demand for reliable electrical infrastructure.

For mining and industrial facilities, substation equipment planning should account for:

• Large motor loads

• Variable speed drives

• Crushers, pumps, conveyors, and compressors

• Process automation

• Power factor correction

• Harmonic distortion

• High availability requirements

• Dust, heat, corrosion, and remote access

• Maintenance windows

• Redundancy and spare capacity

• Grid connection conditions

Industrial electrification can also increase power quality risk. VSDs, rectifiers, UPS systems, EV charging, and automation loads can contribute to harmonic distortion, overheating, nuisance tripping, and transformer derating. For some WA sites, active harmonic filters, capacitor banks, and reactive power compensation may be required as part of the substation planning process.

Renewable Energy and Storage Change the Equipment Profile

Renewable energy and storage projects are not passive loads. They are dynamic grid assets that may export, import, regulate voltage, provide grid support, or operate under complex dispatch conditions.

For renewable and BESS projects connected to the SWIS, equipment specifications should address:

• Generator step-up transformers

• Inverter transformers

• Collector switchgear

• Grid connection switchgear

• Protection relay coordination

• Revenue metering

• SCADA integration

• Harmonic performance

• Reactive power capability

• Earthing and neutral grounding

• Grid compliance documentation

• Remote operation

• Lifecycle support

Clean Energy Link - North is expected to make around 400 MW of existing wind and up to 1 GW of new renewable generation available to customers across the SWIS. That scale of renewable connection depends on substations, transformers, switchgear, transmission terminals, and protection systems that are correctly specified and delivered on time.

Procurement Specifications Must Become More Complete

In a high-growth market, incomplete specifications create cost and schedule risk. A vague RFQ may produce an attractive price, but it can also lead to technical gaps, redesign, approval delays, and commissioning problems.

For WA substation equipment procurement, specifications should include:

• Single-line diagram

• Site layout

• Voltage levels

• Transformer ratings

• Switchgear ratings

• Short-circuit level

• Earthing arrangement

• Protection philosophy

• Relay function list

• CT and VT requirements

• Cable data

• SCADA protocol

• Metering requirements

• Internal arc requirements

• Environmental site conditions

• Temperature and altitude data

• Corrosion and dust exposure

• Testing requirements

• Documentation deliverables

• Spare parts requirements

• Local support expectations

The earlier these details are defined, the easier it is for suppliers to engineer the correct solution and for project teams to avoid variation orders.

Transformer Procurement Checklist for WA Projects

Before procuring a transformer for a SWIS-related project, confirm:

• Application: utility, mining, industrial, renewable, commercial, or infrastructure

• Required MVA or kVA

• Primary and secondary voltage

• Vector group

• Impedance

• Cooling method

• Oil type or dry type requirement

• Indoor or outdoor installation

• Ambient temperature

• Noise limit

• Loss evaluation

• Tap changer requirement

• Transport limits

• Site access constraints

• Protection interfaces

• Monitoring accessories

• Factory Acceptance Test requirements

• Standards and compliance documentation

• Spare parts and lifecycle service

For large projects, transformer lead time should be treated as a schedule-critical item.

Why Lifecycle Support Matters in WA

Western Australia has unique project conditions: remote sites, high ambient temperatures, coastal corrosion exposure, mining environments, long transport distances, and critical operating requirements.

That makes lifecycle support essential.

Project teams should consider:

• Local technical support

• Spare parts availability

• Commissioning assistance

• Maintenance training

• Documentation quality

• Relay configuration support

• Retrofit options

• Emergency response capability

• Long-term product support

Equipment that is difficult to service can create unnecessary operational risk. For utilities, mining operators, and industrial facilities, supportability should be included in the technical evaluation from the beginning.

Conclusion

Western Australia’s SWIS growth is reshaping how utilities, mining operators, industrial facilities, infrastructure developers, and renewable energy projects should plan electrical infrastructure.

Rising SWIS electricity demand, renewable energy connection, industrial decarbonisation, storage deployment, and major transmission upgrades all point to one conclusion: transformers, switchgear, and substations must be planned earlier and specified more carefully.

For the Western Australia grid, the best procurement strategy is not simply to buy equipment when a project reaches construction. It is to align transformer capacity, switchgear reliability, protection systems, power quality, site conditions, and lifecycle support with long-term network and facility growth.

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Need support planning substation equipment WA projects? Leistung Energie Australia supplies power transformers, distribution transformers, MV switchgear, high voltage switchgear, capacitor banks, active harmonic filters, and electrical equipment solutions for utility, mining, renewable, infrastructure, and industrial applications. Contact our team to discuss transformer, switchgear, and substation planning requirements for your Western Australia project.