The Australian Energy Regulator (AER) has commenced a mid-year review of its Default Market Offer (DMO) for 2026-27, indicating potential adjustments to benchmark electricity prices for an estimated 600,000 households and small businesses on standing offers across New South Wales, South Australia, and South East Queensland. The preliminary findings, published on September 18, 2026, suggest that shifts in wholesale energy costs since the June final determination necessitate a re-evaluation, potentially impacting consumer bills this quarter.
This unexpected review comes as wholesale electricity prices have shown volatility in recent months, challenging the assumptions underpinning the initial DMO determination. While a final decision on any adjustments is not expected immediately, the AER’s move signals that consumers on standing offers — typically those who haven’t actively shopped for a better deal — could see their electricity bills change before the next annual DMO cycle begins on July 1, 2027.
“The dynamic nature of Australia’s energy market, particularly the fluctuations in wholesale energy costs, requires us to maintain vigilance,” stated an AER spokesperson. “Our preliminary review aims to ensure the DMO continues to reflect the efficient costs of electricity supply, protecting consumers from undue price gouging while ensuring retailers can recover their legitimate costs.”
Why the Mid-Year Review Matters Now
The DMO acts as a safety net, setting a price cap for residential and small business customers on standing offers. It’s designed to protect consumers who don’t engage with the market or are unable to switch to competitive market offers. The AER typically sets the DMO annually in May or June, effective from July 1. However, significant, unforeseen changes in underlying cost components can trigger interim reviews.
The current review is primarily driven by recent movements in wholesale electricity prices. While the exact magnitude of potential changes is yet to be determined, any upward adjustment would directly impact the bills of hundreds of thousands of Australians. Conversely, a downward adjustment, though less likely given the current market sentiment, would offer welcome relief.
For context, the DMO for 2026-27, finalised in June, saw varying changes across states. For instance, some NSW households saw an average decrease of 8.5% (around AUD$140 annually) on their reference price, while some South Australian customers experienced a smaller reduction or even slight increases depending on their network area. These new preliminary findings could modify those projections.
Who is Affected?
Customers most affected by any DMO adjustments are those who have not switched to a market offer with their retailer. These customers are typically on a ‘standing offer’, which is the default contract. Industry estimates suggest that approximately 10% of residential customers and 15% of small business customers in NSW, SA, and South East Queensland are on standing offers. This translates to roughly 600,000 households and businesses vulnerable to these potential price shifts.
Customers on market offers, which often come with discounts and different terms, are generally not directly impacted by DMO changes unless their retailer chooses to adjust their market offer in response to broader market signals. However, the DMO still serves as a benchmark, influencing the competitiveness of all market offers. It’s a critical reference point for consumers comparing different energy plans.
What Consumers Should Do
Given the looming uncertainty, now is a critical time for consumers on standing offers to review their current electricity plans. Comparing market offers from various retailers can often lead to substantial savings compared to the DMO. Websites like Energy Made Easy (federal) or state-specific comparison sites (e.g., Service NSW, Victorian Energy Compare) provide tools to help consumers find better deals.
Energy-conscious households can also explore options to reduce their overall consumption. Investing in energy-efficient appliances or considering solar panel installations can significantly mitigate the impact of rising electricity costs. For those considering solar, understanding Solar System Installation Costs in Australia 2026: A Complete Guide can be a valuable first step. Additionally, exploring options like Maximise Your Home Battery Savings: Earn $1,000+ Annually with a VPP in 2026 could offer further bill reductions, especially as wholesale prices fluctuate.
While the AER’s review is still in its early stages, its initiation underscores the ongoing volatility in Australia’s energy market. Consumers are urged to stay informed and proactive in managing their energy costs.
Potential DMO Component Adjustments
While specific figures are yet to be finalised, the AER’s review will likely focus on the following components of the DMO, which are most sensitive to wholesale market changes:
| Component | Description | Impact on Bills |
|---|---|---|
| Wholesale Energy Costs | The cost for retailers to purchase electricity from the National Electricity Market. | Directly impacted by market volatility; primary driver of current review. |
| Network Charges | Costs for the poles, wires, and other infrastructure to deliver electricity. | Set by network businesses, generally stable but can see annual adjustments. |
| Environmental Schemes | Costs associated with government schemes like the Renewable Energy Target. | Can fluctuate based on scheme targets and certificate prices. |
| Retailer Operating Costs | Costs for customer service, billing, and other administrative functions. | Generally stable, but inflation and regulatory compliance can influence. |
The AER has indicated it will conduct further stakeholder consultations before releasing a draft decision, expected in late October 2026, with a final determination likely before the end of the year. This timeline means any changes could be implemented as early as the first quarter of 2027, affecting bills received in January or February.
For households seeking immediate relief or exploring long-term savings, understanding Australia’s Energy Bill Relief Landscape in 2026: A Comprehensive Guide to State and Federal Support remains crucial. This guide details various government programs that could help offset rising costs.
The energy market’s complexity means that proactive engagement remains the most effective strategy for consumers to manage their electricity expenses. The AER’s mid-year DMO review is a timely reminder of this ongoing necessity.