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On back-to-back days, NSW batteries broke their own discharge record. On 27 September 2025, the NSW battery fleet hit 659.9MW at 18:40. Then the very next day, it pushed even higher to 664.3MW at 18:25. That’s a 0.7% jump in just 24 hours.

These records weren’t set in isolation. They were part of a bigger milestone weekend for Australia’s National Electricity Market. On 27 September 2025, total NEM battery storage capacity hit 6,591.5MWh at 16:30. That smashed the previous record of 5,900.6MWh, which had only been set ten days earlier on 17 September 2025. It’s an 11.7% jump in under two weeks.

Batteries across the NEM were charging hard through the middle of the day on Saturday. That pushed total stored energy past 6.5GWh for the first time ever. Victoria had already made history earlier in September by becoming the first state to cross the 1GW battery charging milestone.

Queensland also got in on the record-breaking weekend. On 28 September 2025, Queensland’s batteries hit a new charging record of 658.8MW at 10:55. That topped its previous record of 643.8MW, set just nine days earlier.

The growth isn’t slowing down. Australia brought 8.6GWh of big batteries online in 2025 alone. NSW’s household battery program had reportedly installed roughly 1,468MWh of capacity by the end of 2025. That’s more than the largest grid-scale battery in the country, the Eraring battery, which stores 1,073MWh.

The state’s also building big. Six long-duration battery projects got NSW Government contracts. The Great Western Battery near Lithgow will store 3,500MWh. The Bannaby BESS in the Southern Tablelands will hold 2,676MWh. The Bowmans Creek BESS in the Upper Hunter will store 2,414MWh. NSW now holds the title of having the most battery projects in Australia, with over 200 projects either under construction or in the planning pipeline.

All this extra battery capacity’s having a real effect on the market. Average battery discharge jumped by 70MW, a 200% increase. NSW coal generators are feeling the pressure too. Their spot market profits are expected to fall by 30 to 40% because batteries are now competing directly with them during high-price periods. This practice of capitalising on price differences is a form of energy arbitrage, where operators buy cheap power to store and discharge it when prices peak. However, that growing fleet also faced costly challenges in November 2025, when several NSW batteries were caught charging during $14k/MWh price spikes caused by network constraints, costing operators an estimated $600/MW and $1,100/MW per MW.

✅ Claims in this article were verified using AI-assisted fact-checking.

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