The short answer
What the wholesale electricity price actually is
The wholesale electricity price is the number you see on the news when prices "hit the cap" or "go negative". It is set in the spot market: every five minutes, the Australian Energy Market Operator stacks every generator's offer from cheapest to dearest and dispatches just enough to meet demand. Here is the part most explainers skip: your retailer almost never pays that live spot price for your power. They hedge it with contracts struck months ahead, which is exactly why your bill can sit flat through a record wholesale spike, then jump at the next annual repricing. Understand the lag, and you stop bracing for a bill shock that is already months in the past.
Here is the core takeaway in one line: the wholesale spot price is the live, five-minute price retailers pay to buy electricity, but they hedge it with contracts months ahead, so it reaches your bill slowly and smoothed, not in real time. The common assumption is that when the news shouts about record wholesale prices, your bill is about to jump this week. It is not. Your retailer locked in most of its buying price long before the spike, and only repassed it to you, if at all, at your next annual repricing. Understand the lag and you stop reacting to a number you are not actually exposed to.
Reframe the assumption: the spot price is the price of electricity at this exact moment, paid by your retailer, not by you. The number on your bill is a blended, hedged, months-old version of it. They are related, but they move on completely different timescales.
The blind spot
Why most wholesale-price coverage misleads you
Most reporting about wholesale electricity prices does the same three things, and each one quietly leaves readers worse off.
First, it treats the live spot price as your price. A chart of prices hitting the cap runs with a headline implying your bill is about to follow. For the overwhelming majority of households, it will not, because your retailer hedged that volatility before it happened and sells you a smoothed rate that changes once or twice a year.
Second, it ignores the lag entirely. Wholesale and retail prices are reported as if they move together, when in reality a sustained wholesale rise takes months to surface in retail rates, and a brief spike often never does. The timing is the whole story, and it is the part that gets dropped.
Third, it never explains who actually carries the spot risk. The companies exposed to the live price are retailers, not households, and whether a retailer survives a price spike depends on how well it is hedged. That is why some retailers collapse and others shrug it off, and it is the part that decides whether your retailer is still around next year.
How the market actually works
Expert analysis: from the bid stack to your bill
How the spot price clears, every five minutes
Generators offer to supply electricity at a price they nominate. Every five minutes, the Australian Energy Market Operator stacks those offers from cheapest to dearest, draws on them in that order, and dispatches just enough to meet demand in each region. The price of the last, most expensive unit needed sets the single regional spot price for that interval, and every dispatched generator gets paid that same clearing price. It is capped at a market price ceiling, around $17,500 per MWh, and floored well below zero. When a coal unit trips on a hot evening, the price can rocket toward the cap; when rooftop solar floods the grid at noon, it can fall below zero, because there is more cheap supply than demand.
Hedging: why your retail rate lags wholesale by months
A retailer that bought all your power at the live spot price would go broke the first time prices hit the cap. So they do not. They hedge, buying financial contracts (swaps, caps and futures) months or even years ahead that lock in a price regardless of what the spot does on the day. When the spot spikes, the hedge pays out and offsets the cost; when it crashes, the hedge costs them. The result is that your retailer\'s effective buying cost is a smoothed average, set long before any given spike. They pass that blended cost to you as a usage rate that changes at most once or twice a year. That is the mechanism behind the lag: a sustained wholesale rise feeds into the next round of hedge contracts, and only then into your next repricing, often six to twelve months later.
Gentailers versus small retailers: the hedge advantage
Not everyone hedges the same way. A gentailer, a company that both generates and retails, such as AGL, Origin or EnergyAustralia, is naturally hedged: when the spot price spikes, its retail arm pays more but its generation arm earns more, and the two largely cancel out. A small retailer that owns no generation has to buy its hedges on the open market, and if it is under-hedged when prices spike it can be forced to buy at the spot price and lose money on every customer it serves. This is the structural reason small, unhedged retailers are the ones that collapse during wholesale price events, while the big gentailers ride them out.
Wholesale pass-through plans: the only way to actually pay spot
There is one way for a household to pay the live spot price: a wholesale pass-through plan, such as the one offered by Amber. Instead of a smoothed rate, you pay the live spot price plus a fixed monthly fee, and you see the price move in real time. When rooftop solar pushes midday prices negative, your power is almost free; during an evening price event, when the spot spikes, it is brutally expensive. It can pay off handsomely for households that actively shift their usage and watch prices, and it can hurt households that cannot. For everyone else on a standard plan, the spot price is your retailer\'s problem, not yours.
Interactive explainer
Spot price versus the rate you pay
Slide the average wholesale price to see how it feeds into an illustrative retail rate. Wholesale is only about a third of what you pay. The network, retail and scheme slices do not move with the spot price.
Average wholesale price this year: c/kWh
Illustrative retail usage rate you would pay
c/kWh (wholesale is about 33% of this)
Illustrative only. The retail rate is built by treating wholesale energy as roughly one third of the rate and holding the network, retail and environmental slices fixed. Real rates depend on your distributor, plan, state and your retailer\'s hedging, and most households pay a smoothed rate, not the live spot price. Source: ACCC and AER residential price monitoring (indicative).
The same numbers, in plain text
How a retail rate is built from a wholesale input
Worked example at a wholesale price of 12 c/kWh, the widget\'s default. Only the wholesale slice moves with the spot price.
| Rate component | Share | At 12 c/kWh wholesale | Who sets it |
|---|---|---|---|
| Wholesale energy (the spot market) | 33% | 12.0 c/kWh | What your retailer pays into the spot market to buy your electricity, smoothed by hedging contracts. This is the only slice the spot price sets directly. |
| Network (poles, wires, distribution) | 43% | 15.6 c/kWh | The cost of physically delivering power to your door, set by the Australian Energy Regulator. It does not move with the spot price. |
| Retail costs and margin | 17% | 6.2 c/kWh | Billing, customer service, hedging costs, acquisition and the retailer's profit. |
| Environmental schemes | 7% | 2.5 c/kWh | Federal and state renewable and efficiency schemes recovered through your bill. |
What this means for real households
How misreading the spot price costs you money
The lag above is not academic. It is exactly how households make the wrong call:
They brace for a bill shock that is already in the past
A wholesale spike makes the news, so a household on a standard plan expects a huge bill next month. It never comes, because the retailer hedged it. Meanwhile they miss the slow, sustained wholesale rise from a year ago that is only now landing in their rate. They watch the loud, live number and ignore the quiet, lagged one that actually moves their bill.
They sign up for a pass-through plan without the discipline to use it
Hearing that wholesale prices go negative at midday, a household switches to a pass-through plan expecting cheap power, then keeps running the dryer and the air conditioner through the evening peak when the spot price spikes. The plan only rewards households that genuinely shift their usage into the cheap hours; without that discipline it can cost more than a smoothed plan.
They stay with a small retailer that is one spike from collapse
A household chases a slightly cheaper rate from a tiny retailer without realising that an unhedged retailer can fail when wholesale prices spike, forcing a stressful transfer to a retailer of last resort. The price was real, but so was the risk that came with it.
They get advice that does not apply to them
A WA or NT household reads national coverage of the five-minute spot market and tries to act on it, but the National Electricity Market does not reach them. WA runs its own Wholesale Electricity Market and the NT runs isolated systems, neither with open retail competition, so the advice is structurally impossible to follow.
The insider insight
The spike that breaks a retailer barely touches your bill
Here is the part the headlines never connect. When wholesale prices hit the cap for a sustained stretch, the drama is not on household bills, it is on retailer balance sheets. A well-hedged gentailer barely notices, because its own generators are earning the high prices its retail arm is paying. A small, under-hedged retailer can be bleeding money on every kilowatt hour it sells, sometimes fatally. The same price event is a non-event for one company and an extinction event for another, purely because of how each one hedged.
The non-obvious truth: the question that protects your bill is not "what is the spot price doing this week", it is "how well is my retailer hedged, and how does it pass costs through". A big gentailer will smooth volatility into a stable, if not always cheapest, rate. A cut-price small retailer might be cheaper today and gone, or sharply repriced, after the next sustained spike. The cheapest headline rate is not always the one that survives the year, and a forced transfer to a retailer of last resort almost never lands you on a good plan.
So the practical lesson from how wholesale pricing really works is not "panic when the spot spikes", it is "understand that the spike is your retailer\'s risk, and pick a retailer you trust to carry it without dumping it on you all at once".
Grounded in the analysis
What you should actually do
Moves that follow from how the spot market really reaches, and does not reach, your bill.
Ignore the live spot price, watch your annual repricing
Unless you are on a pass-through plan, the five-minute spot price is not your price. The number that moves your bill is your retailer's usage rate, which changes at your annual repricing. Watch that, not the headlines.
Only choose a pass-through plan if you can shift load
A wholesale pass-through plan like Amber pays off only if you actively move heavy usage into the cheap, solar-soaked middle of the day and off the evening peak. If you cannot, a smoothed plan is safer.
Weigh retailer stability, not just the headline rate
A slightly cheaper rate from a small, unhedged retailer carries the risk of repricing or failure after a wholesale spike. Compare plans, but factor in how the retailer is likely to carry spot risk on your behalf.
In a NEM state (QLD, NSW, ACT, VIC, TAS or SA)? Compare electricity plans against the reference price. In WA or the NT, there is no retail competition to compare.
Current figures, last updated 2026-06-15
Key wholesale electricity facts. Sources: the Australian Energy Market Operator (aemo.com.au), the Australian Energy Market Commission (aemc.gov.au), the Australian Energy Regulator (aer.gov.au) and the ACCC (accc.gov.au). Market-design values are reviewed regularly; confirm before relying on them.
The bottom line
Why this matters right now
As coal retires and more solar and storage come online, the wholesale spot market is getting more volatile by the hour: deeper negative prices at midday, sharper spikes in the evening. That makes the spot price scarier on the news, and it makes hedging more valuable, not less. But the thing that has not changed is the wall between the live spot price and your bill. Stop bracing every time wholesale "hits the cap". Watch your own annual repricing, only take on spot exposure through a pass-through plan if you can genuinely shift your usage, and pick a retailer you trust to carry the volatility without dumping it on you all at once. That is how you turn an understanding of the spot market into a steadier, smaller bill, in the states where you can act on it.
Common questions
A Selectra expert answers your questions about wholesale prices
In the spot market. Every five minutes, the Australian Energy Market Operator collects every generator's offer to supply power, stacks them from cheapest to dearest, and dispatches just enough to meet demand in each region. The price of the last, most expensive unit needed sets the single regional spot price for that interval, and every dispatched generator is paid that same clearing price. It is capped at a market price ceiling (around $17,500 per MWh) and can fall below zero when there is too much cheap supply.
Because your retailer does not buy your power at the live spot price. They hedge it, buying contracts months or years ahead that lock in a price, so a short wholesale spike costs them little extra in the moment. They then sell you a blended, smoothed usage rate that changes once or twice a year, not every five minutes. The link between wholesale and your bill is real, but it is lagged by months and smoothed by hedging. A sustained rise in wholesale prices shows up at your next annual repricing, not the week of the spike.
A gentailer is a company that both generates electricity and retails it, such as AGL, Origin and EnergyAustralia. Because they own generation, they are naturally hedged: when wholesale prices spike, their retail arm pays more but their generation arm earns more, so the two largely offset. A small retailer that owns no generation has to buy hedge contracts on the open market, and if it is under-hedged when prices spike it can be forced to buy at the spot price and lose money on every customer. That is why it is small, unhedged retailers that tend to collapse during wholesale price events.
Only on a wholesale pass-through plan, such as the one offered by Amber. On a standard plan your retailer buys at wholesale and sells you a smoothed rate, so you never touch the spot price. On a pass-through plan you pay the live spot price plus a fixed monthly fee, which can be very cheap when rooftop solar floods the grid at midday and pushes prices negative, but brutally expensive during an evening price event when the spot price spikes. It rewards households that can actively shift their usage and watch prices, and punishes those who cannot.
Because there is too much cheap supply in the middle of the day. Millions of rooftop solar systems pour power into the grid around midday when household demand is low. When supply outstrips demand, the spot price can fall below zero, meaning generators effectively pay to keep running rather than shut down and restart. This is why daytime feed-in tariffs have collapsed and why the scarce, expensive hours have shifted to the evening peak, after the sun sets but while demand is still high.
No. The five-minute spot market described here is the National Electricity Market, which covers Queensland, New South Wales, the ACT, Victoria, Tasmania and South Australia. Western Australia runs its own Wholesale Electricity Market on the South West Interconnected System, with Synergy as the main retailer and the Economic Regulation Authority overseeing it. The Northern Territory runs separate, largely isolated systems. Neither has open retail competition, so households there cannot choose a retailer the way an eastern-states customer can.
