The South West Interconnected System (SWIS) is an electricity grid in the southwestern part of Western Australia.
The SWIS consists of both the South West Interconnected Network ("poles and wires") and its electricity generators.
[3] The majority of large-scale generation on the SWIS is coal-fired or gas-fired, with a small but increasing proportion coming from wind and solar.
[4] A 100MW/200MWh battery storage power station is (of July 2022) under construction for connection to the SWIS, and is expected to be completed by "the end of 2022".
[6] 36% of customers connected to the SWIS have grid-connected rooftop solar systems, with a total installed capacity of 1362 MW.