We don't see $100 USD/kWh in Australia, although admittedly I don't know how much of the build cost is the battery itself - the following is our newest BESS, Liddell.
Australian energy major AGL has seen its 1,000MWh Liddell battery energy storage system (BESS) in New South Wales (NSW) enter AEMO’s Market Management System.
The 500MW/1,000MWh grid-scale battery system registered with AEMO on 30 September and is now ready for commissioning and testing phases. AEMO’s Market Management System is the core IT system that manages the National Electricity Market (NEM) wholesale market.
AGL’s lithium-ion BESS is located on the shores of Lake Liddell, roughly 220km north of the state capital, Sydney, and 120km west of Newcastle. It is located at the site of the former Liddell Power Station, a decommissioned 2,000MW coal-fired power station in the Hunter Valley region of NSW.
AGL Energy previously confirmed that the total construction cost of the Liddell BESS is estimated to be approximately AU$750 million (US$489 million).