RWE has officially opened Australia’s first 8-hour battery, the 50MW/400MWh Limondale system in south-west New South Wales, marking a significant milestone in the NEM’s shift towards longer-duration energy storage. The commissioning provides a tangible example of the new asset class required to firm a grid increasingly reliant on intermittent renewables. This development in grid-scale storage arrives as NEM spot prices plunged 46.2 per cent week-on-week to average just $38.69/MWh, driven by mild conditions and strong renewable output that suppressed daytime demand and highlighted market volatility.
The industry is broadly pivoting towards these longer-duration assets to manage such volatility and ensure reliability. In a clear signal of this trend, a state-owned utility confirmed it is negotiating investments in 8-to-12-hour storage technologies, moving beyond its initial four-hour battery projects. The strategic shift is underscored by recent analysis showing how depleted four-hour batteries during a two-day January heatwave allowed expensive gas generators to set prices, contributing to a near doubling of quarterly wholesale costs in one state. This experience has sharpened the commercial case for storage that can discharge consistently through evening peaks and overnight lulls.
Meanwhile, technology integrators are warning that the explosive growth of AI data centres requires co-located storage to prevent grid instability. Wärtsilä Energy Storage argues that battery systems are essential to buffer the volatile, high-intensity load spikes characteristic of AI computing, which could otherwise “destroy the grid”. This emerging demand driver is already shaping global supply chains. Chinese manufacturer Daqo New Energy will invest CNY 6 billion ($835 million) into a new manufacturing base focused on advanced power equipment and storage solutions specifically for AI data centre applications.
This urgent search for new flexible capacity comes as EnergyAustralia holds firm on its June 30, 2028, retirement date for the 1,480MW Yallourn coal plant in Victoria. The company is focusing on a replacement precinct that includes the 350MW Wooreen battery project, alongside potential solar, gas, and pumped hydro developments. The State Electricity Commission also flagged its role in filling gaps across the transition, from home electrification to deep, long-duration storage, reinforcing the focus on a diversified portfolio to replace retiring thermal generation.
Underpinning these investment decisions are persistent calls for market reforms to better manage physical network constraints. Industry analysis continues to push for enhanced, location-based price signals to address network congestion and curtailment, aiming to align financial incentives with the physical realities of the grid. On the infrastructure front, Transgrid announced its EnergyConnect interconnector is now fully energised. The completion of Australia’s largest transmission project is a critical step towards improving energy sharing and reducing costs for consumers across New South Wales, Victoria, and South Australia.
Globally, the push for flexible, zero-carbon generation and storage continues to accelerate. Wärtsilä completed the first successful grid-connected test of a large-scale engine running on 100 per cent hydrogen in Spain, proving a key technology for future thermal firming. The Czech Republic is also converting part of a hydropower station into a 154MW/750MWh pumped hydro plant. Locally, market attention now turns to upcoming regulatory processes, with submissions closing in mid-July for two AEMO consultations on market procedure amendments.