Unlike the rest of Australia, where NSW, VIC, QLD, SA, WA, and TAS retailers can change pump prices at any time, NT retailers operate under a transparency regulation that requires next-day prices to be published in advance. The current changeover is 14:30 ACST (UTC+9:30); the published figure becomes the actual pump price for the entire next window.
This means NT prices behave differently to the standard east-coast price cycle. There is no within-day intra-cycle volatility once the next window is locked. The most actionable question becomes "is tomorrow cheaper or more expensive than today?", because the answer is already published.
Each NT station page on Petrolmate shows the current pump price and our recommendation engine emits a price_lock block with one of three actions:
In the first weeks of operation, most NT stations have defaulted to LOCKED. Drops are rare in the data so far. When they do occur, the recommendation engine bumps confidence on the rise path because the price is published, not forecast.
Open any NT station page on Petrolmate and look for the price-lock card directly under the live price. The card shows three things: the current pump price, the next-window locked price published by the regulator, and one of the three action labels above. The colour bar on the left indicates urgency. Green means LOCKED (no action needed). Amber means FILL_BEFORE_RISE (act before 14:30 ACST). Blue means WAIT_FOR_DROP (delay until after the changeover for a cheaper fill).
Below the action label, the widget shows the cents-per-litre delta between today and tomorrow. A delta of 0c means LOCKED. A positive delta (for example +4.2c) means tomorrow is more expensive. A negative delta (for example -3.8c) means tomorrow is cheaper. The widget also shows a countdown to the 14:30 ACST changeover so you can plan exactly when to refuel.
You drive past a 7-Eleven in Darwin at 11am on a Tuesday. Today's pump price for ULP is 199.9c/L. The Petrolmate widget shows the next-window locked price is 207.4c/L, with FILL_BEFORE_RISE in amber. The 7.5c/L rise has been published by the NT regulator and will take effect at 14:30 ACST. On a 50L tank, filling now versus tomorrow saves $3.75. The widget recommends filling before the changeover. Confidence: 0.95.
You stop at a Caltex in Alice Springs at 9am on a Friday. Today's pump price for diesel is 215.2c/L. The widget shows the next-window locked price is 209.6c/L, with WAIT_FOR_DROP in blue. The 5.6c/L drop has been published and takes effect at 14:30 ACST. If your tank can wait six hours, you save $2.80 on a 50L fill. The widget recommends delaying refuel until after the changeover. Confidence: 0.95.
You arrive at an Ampol in Katherine at 1pm on a Sunday. Today's ULP price is 196.4c/L. The widget shows the next-window locked price is also 196.4c/L, with LOCKED in green. There is no timing advantage. Refuel whenever it suits your schedule. The widget shows a 0.0c delta and recommends no action.
The Northern Territory has historically experienced higher and more volatile retail fuel prices than the eastern states, partly because of long supply chains from Adelaide and Brisbane refineries, partly because of low retail competition outside Darwin. Successive NT governments have tested various price-monitoring frameworks since the early 2000s. The current 24-hour publication regime requires retailers to publish their pump prices a full day before the prices take effect, with a fixed daily changeover at 14:30 ACST.
The regime gives consumers visibility into upcoming price changes and reduces intra-day volatility, in contrast to NSW, VIC, QLD, SA, WA, and TAS where retailers can change prices at any time. Critics argue the model dampens competitive responses to wholesale price moves. Supporters note that NT has the most transparent retail fuel market in the country and the only one where every motorist can see tomorrow's prices today.
For drivers, the practical implication is straightforward: NT prices behave like a series of 24-hour blocks rather than a continuous market. The decision is always "fill now or wait until the next block?" rather than "is the cycle near its trough?" as it is in the east-coast metros.
Does the recommendation update during the day? Yes. The published next-window price is fixed once the regulator pipeline emits it (typically late morning), but the current pump price and the delta refresh as Petrolmate syncs new data from MyFuel NT. If a station updates its current price between syncs, the widget will reflect that on the next refresh.
What happens if I refuel exactly at 14:30 ACST? The pump price changes at 14:30. Refuel a few minutes before to lock in the lower price if FILL_BEFORE_RISE is showing. If WAIT_FOR_DROP is showing, refuel a few minutes after.
Are the locked prices ever wrong? The regulator publication is authoritative, but individual stations can submit late corrections. Petrolmate flags these corrections by re-emitting the recommendation. If a station has not yet been synced after a regulator correction, the widget displays a "data lag" warning rather than a stale recommendation.
Do remote NT stations have the same model? Yes. The NT regime applies statewide. Stations in Darwin, Palmerston, Alice Springs, Katherine, Tennant Creek, and remote locations all participate. Petrolmate currently tracks coverage of around 196 NT stations including remote regional sites.
| Station | Suburb | Fuel | Locked price |
|---|---|---|---|
| Next-window NT locked prices will appear here once the regulator publishes the next changeover. Last regulator publication: see /api/recommendation/<station> for a specific NT station. | |||
Showing up to 10 of the cheapest NT next-window locked prices currently published by the regulator. Updated continuously as new price-lock data arrives.