$1,984. That is roughly what a typical residential customer using around 4,000 kilowatt-hours a year pays annually on a standing offer in south-east Queensland under the current Default Market Offer framework. It is not the cheapest deal available, not by a long margin, and yet a substantial share of households remain on it. That single fact tells you most of what you need to know about how retail electricity pricing works in Australia — and why the DMO is simultaneously a genuine consumer protection and a politically convenient shield for an industry that has figured out how to live inside its boundaries rather comfortably.
What the Default Market Offer actually is #
The Australian Energy Regulator sets the DMO each financial year. It is a price cap, not a mandated tariff. Retailers in New South Wales, south-east Queensland and South Australia cannot charge residential and small-business customers more than the DMO on their standing offers — the contracts that customers roll onto when they do nothing, sign nothing and shop for nothing.
Victoria runs a parallel system called the Victorian Default Offer, set by the Essential Services Commission. Different acronym, same idea.
The AER publishes its DMO determination publicly each year, and if you want to read the methodology in full, it is worth an hour of your time at aer.gov.au. The inputs — wholesale costs, network charges, environmental levies, retail margins — are all laid out. The regulator has been candid that the DMO is not designed to be the cheapest offer on the market. It is a reference point and a ceiling on the worst offer available. There is a meaningful difference between those two things, and the retail industry knows it very well.
How the DMO is calculated — and why it matters which costs go in #
The biggest lever in the DMO determination is wholesale energy costs. These are estimated using futures market data, and they swing hard from year to year. After the energy price shock that ran through 2022 and into 2023, wholesale costs pushed DMO levels to multi-year highs. The AER’s subsequent determinations have come back somewhat as gas and coal prices eased, but the network cost component — poles, wires, substations — has moved in the other direction as investment in the transition accelerates.
Follow the money on that network piece. Grid augmentation to support renewables integration is real spending, and it has to land somewhere. The AER’s distribution network revenue determinations, running on five-year regulatory periods, set the upper bound on what the networks can recover through tariffs. Those tariff increases flow directly into the DMO calculation. When the regulator signs off on a distribution network’s capital expenditure programme, it is, several steps removed, setting part of your power bill. The link is not always made explicit in the public debate, and that is a gap.
We have written before about why electricity pricing needs structural reform, and the DMO sits squarely in that story. Time-of-use tariffs, demand charges, the treatment of rooftop solar exports — none of these are cleanly reflected in a single annual reference price. The DMO methodology is catching up slowly, but it is still a largely flat-rate framework trying to describe a grid that increasingly is not.
Standing offers: who is actually on them? #
The honest read is that standing-offer customers are disproportionately older, less digitally engaged, renters without control over their billing, or people who went through a life event — a death in the family, a move, a financial crisis — and never got around to switching. They are not stupid. They are busy, or stretched, or simply unaware that the gap between a standing offer and a decent market offer can run to several hundred dollars a year.
The AER’s retail market reports have tracked this persistently. A meaningful portion of residential accounts sit on standing or expired market offers, and the share has not collapsed despite years of government campaigns urging people to compare and switch.
I’ll admit I got this wrong for years. I used to assume that once comparison tools became easy enough, the problem would largely solve itself. It has not. The friction is not primarily informational — it is behavioural and structural. People trust inertia. And frankly, the retailers have very little incentive to fix that. A customer who never switches is, from a margin perspective, a good customer.
The gap between the DMO and the market — and what retailers do with it #
The DMO does not suppress competition. That is actually the intent. By capping the floor on standing offers, the theory goes, retailers are forced to compete for engaged customers with better market deals, while a safety net exists for those who do not engage.
In practice, the market has stratified. The best deals — typically 20 to 30 per cent below the DMO reference price — go to customers who shop via comparison sites, accept conditional discounts, meet direct-debit requirements and renew their contracts regularly. The standing-offer customer subsidises none of that. They pay close to the cap.
The retail margin embedded in the DMO is not generous by any measure, but it is reliable. There is a reason the large integrated retailers have not aggressively tried to migrate standing-offer customers to cheaper products. The AER watches for this. The Competition and Consumer Act imposes obligations around misleading conduct. But the soft incentive to leave the disengaged customer where they are is real, and I reckon it is underappreciated in the policy discussion.
For a broader picture of how Australia’s energy mix shapes these costs over time, our piece on the role of fossil fuels and renewables in Australia is worth reading alongside this one.
Rooftop solar and the DMO: an awkward fit #
The DMO was designed in a pre-solar world. More than three million Australian households now have rooftop solar, and the interaction between the DMO, feed-in tariffs and time-of-use pricing has become genuinely complicated.
A household on a standing offer with a 6-kilowatt rooftop system faces a particular problem. Their flat import tariff under the DMO may look reasonable on paper, but if the retailer is paying them a feed-in tariff of 4 to 6 cents per kilowatt-hour for solar exports while the grid’s midday excess pushes the spot price negative, the economics of self-consumption versus export shift constantly. The DMO does not price any of that dynamism. It is a blunt instrument in a grid that has become surprisingly sophisticated, and the story of Australia’s rooftop solar success makes this tension clear.
The AEMC has been working on demand management and tariff reform for years. Some of that work is starting to filter through into network tariff structures, which is good. But the DMO as a retail pricing reference point has not kept pace. A household with solar on a flat-rate standing offer is not being served well by the current framework, and in my view the AER’s methodology reviews have moved too cautiously on this.
What a future DMO might look like #
The regulator and the AEMC have both flagged interest in a more dynamic reference price framework, one that accounts for solar, batteries, electric vehicle charging and the load-shifting behaviour that virtual power plants will increasingly enable. AEMO’s projections — available in the Integrated System Plan at aemo.com.au — point to a grid where the evening peak is the dominant cost driver and the middle of the day is nearly valueless from a supply perspective. A flat annual reference price simply cannot encode that signal.
The practical challenge is that a more complex DMO is harder to use as a protection for disengaged customers. If the reference price has multiple components — peak rate, off-peak rate, feed-in credit, demand charge — the person who never engages with their bill cannot easily assess whether their retailer is complying. Simplicity and accuracy pull in opposite directions here, and I do not think the sector has a clean answer yet.
It is a bit like setting the field for a tail-ender. You can protect one side of the wicket or the other, but not both at once.
The longer-term question is whether the DMO survives the transition at all in its current form, or whether it is replaced by something more like a genuine social tariff — a regulated product for hardship customers, with market competition handling everyone else. Some consumer advocates have pushed this direction. The retail industry would prefer to keep the current structure, which gives them a known ceiling and a predictable group of customers who are unlikely to leave.
What does not change is the basic math. If you are on a standing offer and you have not checked your bill against what is available in the market in the last twelve months, the gap is almost certainly worth your time. The DMO is a floor on the worst deal, not a guide to a fair one. Knowing the difference is the only protection that actually works consistently — and that is a problem the regulator can set caps around but cannot fully solve.
— Marcus Wren, Editor
