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A dedicated read of the world’s largest isolated grid: a system where rooftop solar, storage, operational demand and system security are being forced to evolve together.
The SWIS cannot lean on interconnection when midday rooftop output rises or synchronous generation falls. That makes its distributed-energy transition unusually legible, and unusually relevant to markets approaching the same constraint.
Renewable electricity
41%
of the main WA grid in 2025
Rooftop solar
~20%
of SWIS electricity in 2025
Distributed solar
2.5 GW+
installed across the system
Solar households
41%
of homes connected to the SWIS
The SWIS Grid Demographic Atlas joins annual ABS population with household, dwelling, income and age measures across a versioned public-extent screening cohort. Explore local growth and test 2030 or 2050 addressability scenarios.
The DER Adoption & Network Opportunity Map allocates monthly CER postcode records into the same SA2 cohort, then compares uptake with housing, growth and published Western Power network needs.
How far does operational demand fall when rooftop output is high, and what must remain online to keep the system secure?
When does emergency solar management become a system capability rather than a last-resort intervention?
Can household and grid batteries reshape the midday surplus and the evening ramp without simply shifting risk?
Which operating rules and visibility tools travel to other weakly interconnected, high-DER systems?
The Observatory now carries a reproducible WEM operating record: five-minute operational demand and rooftop PV joined into daily minimum-demand, solar-share and evening-ramp measures, with facility-SCADA technology mix beside them.