NEM spot prices collapsed 67.2 per cent week-on-week to average just $15.77/MWh, as a 56.9 per cent renewable energy share suppressed daytime demand. This extreme price action provides a stark backdrop for new analysis suggesting the NEM's fundamental economics are shifting. The market volatility underscores the growing pressure on Australia's thermal generation fleet, which struggles to compete with periods of abundant, near-zero marginal cost renewable energy.
RenewEconomy analysis argues a second wave of large-scale battery storage is poised to undermine the economic viability of coal-fired power stations, potentially accelerating their closure. While the first wave of batteries focused on grid services, this next tranche will increasingly engage in energy arbitrage, charging during low-price solar-heavy periods and discharging when prices are high. This dynamic directly erodes the revenue streams that have historically sustained inflexible baseload generators, forcing some to operate at a loss or exit the market entirely.
Yesterday's confirmation of land acquisition for Energy Vault's 1,000 MWh Stoney Creek project in NSW is a tangible example of this trend. However, the analysis warns that displacing fossil fuels with storage is not enough. The grid requires significant parallel investment in new wind and solar capacity to ensure these batteries have sufficient cheap renewable energy to charge from, maintaining overall system stability as coal plants retire.
A new policy in Ireland offers a potential blueprint for managing the demand side of the equation. Ireland's Large Energy User Action Plan now requires new data centres over 10 MW to source at least 80% of their energy from new, onsite renewable generation and storage. This approach directly links large new loads with dedicated clean supply, avoiding placing additional strain on the shared grid. The policy is a significant global precedent for jurisdictions like Australia grappling with surging data centre demand.
Meanwhile, Australia's electric vehicle market is showing signs of rapid maturation on the consumer front. The market for used EVs is booming, with a growing number of two-to-four-year-old models available in the $20,000 to $30,000 range, according to The Driven. This deepening of the second-hand market signals wider adoption and improved affordability. The pace of change is so swift that models like the BYD Atto 2, considered a game-changer upon its arrival late last year, now face a host of new competitors, reflecting intense market dynamism.
This reshaping of both supply and demand places further emphasis on regulatory frameworks. AEMO continues its work on grid security and network planning, with consultations currently open for changes to cash security requirements for NEM registration and the draft assessment for network support in Melbourne's south-east. These technical proceedings are critical to ensuring the grid's architecture can support this accelerating transition.