The 25 MW / 52 MWh Battery Energy Storage System is co-located with the Lake Bonney Wind Farms near Millicent in South Australia. The battery was energised in 2019.

Iberdrola Australia entered into funding agreements with the South Australian (SA) Government and the Australian Renewable Energy Agency (ARENA) to co-fund the ~$38 million development. The SA Government and ARENA are each contributing up to $5 million in funding.

The battery assists Iberdrola Australia in managing the intermittency risk associated with renewable energy. It also participates in the volatile Frequency Control Ancillary Services (FCAS) markets, providing Iberdrola Australia with a degree of hedging against FCAS costs. In addition, the battery contributes towards system reliability for our customers - and the network as a whole - in South Australia.