Australia’s energy sector has long grappled with inefficiencies that drive up costs for consumers and businesses alike. At the heart of these challenges lies the concept of ENA—Energy Network Ancillary Services—a critical but often misunderstood component of the grid. While these services are essential for maintaining stability, their implementation has exposed systemic flaws that are forcing utilities to reconsider how they operate. The recent surge in demand for ENA, particularly during peak periods, has revealed a stark reality: the current model is failing to deliver on its promises of cost-effectiveness and reliability.
The Australian Energy Market Operator (AEMO) has highlighted that ENA services—including frequency control, voltage support, and reserve provision—are now being demanded at rates that far exceed what independent market participants can realistically supply. This has led to a bottleneck, where the grid’s ability to absorb ancillary services is outpaced by the financial constraints of market participants. For example, the 2023–24 financial year saw a 30 per cent increase in ENA demand in Victoria alone, yet only 15 per cent of the required capacity was supplied by third-party providers. This gap isn’t just technical; it’s economic, with some providers opting to withdraw services entirely due to the lack of incentive under the current pricing structure.
One of the most contentious issues is the reliance on traditional generators—particularly coal and gas plants—to meet ENA demands. These plants, while reliable, are often the most expensive sources of ancillary services. A case in point is the this link, where bids for frequency control services were rejected at rates that were 40 per cent higher than the market clearing price. This not only stifles competition but also reinforces the idea that the grid’s needs are being met by the most costly options available. The result? Higher bills for consumers and a further erosion of trust in the market’s ability to self-regulate.
Beyond the financial implications, the inefficiencies in ENA have broader implications for Australia’s energy transition. As the nation accelerates its shift toward renewables, the grid’s ability to integrate intermittent sources like wind and solar will depend heavily on the performance of ancillary services. Yet, the current model is ill-equipped to handle this shift. For instance, studies by the Clean Energy Council suggest that without significant reforms, the cost of maintaining grid stability through ENA could rise by up to 25 per cent by 2030, directly impacting the affordability of renewables. This creates a paradox: the very services needed to support a green energy future are becoming too expensive to sustain.
The solution isn’t as simple as tweaking pricing mechanisms, though that’s a necessary first step. AEMO and state regulators must also explore alternative models, such as decentralised energy resources (DERs) like battery storage and microgrids, which can provide ENA services at a fraction of the cost. The 2023 pilot program in South Australia demonstrated that community-owned batteries could supply 20 per cent of the region’s ENA needs, reducing costs by up to 35 per cent. However, scaling this approach requires regulatory support and incentives that currently lag behind the urgency of the problem.
In the meantime, consumers are bearing the brunt of these inefficiencies. The Australian Competition & Consumer Commission (ACCC) has warned that energy prices could see another 10 per cent increase in 2024 if ENA costs continue to escalate. This isn’t just a market failure—it’s a failure of governance. The grid’s operators, market designers, and policymakers must work together to redefine ENA, ensuring it’s not just a technical necessity but a cost-effective one. Without action, the cost of stability will continue to eat into the very thing we’re trying to protect: affordability and reliability.
- ENA demand in Victoria surged by 30 per cent in 2023–24, yet only 15 per cent of required capacity was supplied.
- Bids for ENA services in NSW’s 2024 tender were rejected at rates 40 per cent above market clearing prices.
- Clean Energy Council estimates ENA costs could rise by up to 25 per cent by 2030 without reforms.
- Community-owned batteries in South Australia supplied 20 per cent of regional ENA needs at 35 per cent lower costs.
- ACCC projects another 10 per cent increase in energy prices if ENA costs remain unchecked.
The time for half-measures is over. Australia’s energy future depends on it.