French renewable energy developer Neoen has officially completed the second stage of its massive Collie Battery Energy Storage System (BESS) in Western Australia, further cementing Tesla Megapacks as the backbone of the project (via Energy-Storage.News).
Stage 2 of the Collie BESS adds 341 MW/1,363 MWh of capacity through the installation of 348 Tesla Megapack 2XL units. This follows Stage 1, which came online in October 2024 with 219MW / 877MWh of capacity and 224 Megapacks. In total, the two stages now combine for 560MW / 2,240MWh of storage, powered by 572 Tesla Megapacks.
Neoen, which is now wholly owned by Canadian asset manager Brookfield, began discharging power from the expanded Collie BESS into the Wholesale Electricity Market (WEM) on October 1, 2024. The system plays a critical role in supporting grid stability, charging during daylight hours when solar output is high and discharging during evening peaks.
The Collie BESS is underpinned by long-term contracts with the Australian Energy Market Operator (AEMO). Stage 1 secured a two-year agreement in 2023 to provide 197 MW of four-hour “Non-Co-optimised Essential System Services” (NCESS), which started on October 1. Stage 2 has a similar 300 MW/4-hour NCESS contract commencing in October 2025.
Located near Synergy’s 2 GWh Collie Battery project, Neoen’s system is among the largest of its kind in the country and highlights how large-scale battery storage is increasingly being used to complement Australia’s renewable-heavy grid.
With a total investment of around $850 million AUD ($550 million USD), the Collie BESS is one of Neoen’s most ambitious projects to date, showcasing how Tesla Megapacks continue to scale utility-grade clean energy storage worldwide.
