In Western Australia, the latest utility scale battery additions have boosted total capacity to 1,385 MW and 5,367 MWh, surpassing daily utility scale solar contribution. Battery penetration on the WEM often exceeds 20% of evening peak dispatch, targeting periods of low rooftop solar energy generation and coinciding with peak demand. Renewable energy consistently exceeds a minimum of 20% penetration on W.A.'s WEM, highlighting the need for more wind power to meet night-time demand.
https://reneweconomy.com.au/big-batteries-overtake-big-solar-in-the-worlds-largest-isolated-grid/