📋 In this guide:

• Adelaide electricity prices rose 1.4% under the 2026–27 DMO
• South Australia was the only DMO region to increase
• Reference bill moved from $2,301 to $2,334 a year
• Evening usage is where most bills are won or lost
• Tesseract ZERO offers a fixed rate for 10 years

If you opened your inbox in July and found a price change notice from your retailer, you weren’t imagining it. Adelaide electricity prices went up on 1 July 2026, and South Australia was the only region covered by the national price benchmark where they did. Sydney households saw small falls. Adelaide didn’t.

The rise is modest on paper. But when you’re already paying some of the higher power prices in the country, any increase lands hard. And it raises a bigger question: how much longer do you want your household budget tied to a number someone else sets every year?

Here’s what changed, what it means for a typical Adelaide home, and the options worth thinking about.

What Is the Default Market Offer?

The Default Market Offer (DMO) is a price cap set each year by the Australian Energy Regulator (AER). It applies to “standing offers”, the plans you’re on if you’ve never chosen a deal, and it also acts as a reference price that every market offer must be compared against in advertising.

The AER publishes a reference annual bill for a typical household in each network area. For Adelaide, that’s the SA Power Networks region. Retailers can charge less than the DMO, and most market offers do. But when the DMO moves, the whole market tends to move with it.

What Changed for Adelaide on 1 July 2026

Under the AER’s final 2026–27 determination, the reference bill for a typical residential customer in South Australia rose from $2,301 to $2,334 a year. That’s an increase of 1.4%.

Compare that with New South Wales, where reference bills fell. Ausgrid and Endeavour Energy customers saw drops of 3.4%, and Essential Energy customers saw a 5% fall. South Australia was the only DMO region to go up.

A 1.4% rise works out to about $33 a year on the reference bill, or a little under $3 a month. That doesn’t sound like much. The trouble is the long-run trend. According to ABS data, Australian electricity prices have risen about four times over in 20 years, roughly 7.5% a year on average. One quiet year doesn’t change that pattern.

Why Adelaide Bills Are Hard to Control

So why does it feel like your bill only ever goes one way? Your bill isn’t one price. It’s the result of an energy system that generates, transmits, distributes, manages and retails electricity before you switch on a light, and every one of those steps carries a cost. Network charges, wholesale prices and retail margins all feed into what you pay, and none of them are yours to control.

Timing matters too. Picture a Tuesday evening in Salisbury: it’s 6:30pm, the air conditioner is running after a hot day, the oven is on and two kids are charging devices. That’s the most expensive part of the day to use power, and it’s exactly when most families use the most. Peak grid rates can reach up to 56¢ per kWh.

Meanwhile, the cheapest energy of the day is available at midday, when rooftop solar floods the grid. According to SA Power Networks, its network charges are lower between 10am and 3pm for this reason, and the new Solar Sharer Offer gives South Australian households on eligible plans free power from 12pm to 3pm. The gap between cheap midday power and expensive evening power is where Adelaide households can win or lose money.

What You Can Do About Rising Prices

You have more options than you might think.

Compare market offers. If you’ve never switched, you may be on a standing offer priced at or near the DMO. A quick comparison through the government’s Energy Made Easy site can show cheaper plans.

Check your usage by time of day. Most retailer apps show when you use power. If a lot of it sits between 3pm and 9pm, that’s the part of your bill worth tackling first.

Consider a Solar Sharer plan. If you can shift washing, dishwashing or pool pumping into the 12pm to 3pm window, one of the new plans could help. Check the peak rates and supply charge first. Our Solar Sharer Offer guide explains the catch.

Generate more of your own energy. Solar and batteries reduce how much electricity you need from the grid. The question is whether you want to buy that system yourself. A typical solar and battery system can cost $14,000 to $28,000, even after rebates, and you carry the maintenance risk once it’s yours. Our guide to solar vs grid electricity runs through the trade-offs.

How Is Tesseract ZERO Different?

Tesseract was founded in South Australia in 2018, so Adelaide’s power prices aren’t an abstract topic for us. Tesseract ZERO is a third way to energy. Instead of buying all your power through the grid, or buying a solar and battery system yourself, we install the technology at your home, own it and manage it. You pay a fixed 28¢ per kWh for the clean energy your home uses, fixed for the 10-year agreement term, with $0 upfront.

Solar generated at home can cover up to 70% of a household’s daily energy, and you stay connected to the grid for the rest. For eligible households, typical customers may save up to 30% on their energy costs.

Based on the savings of a typical customer. Eligibility criteria apply. Savings vary based on household energy usage and location.

See how it works on the Tesseract ZERO page.

FAQ

How much did Adelaide electricity prices go up in 2026?

Under the AER’s final 2026–27 Default Market Offer, the reference bill for a typical South Australian household rose 1.4%, from $2,301 to $2,334 a year, from 1 July 2026.

Why did SA prices rise when NSW prices fell?

The DMO reflects each region’s own network, wholesale and retail costs, so regions move differently from year to year. In 2026–27, those costs pushed South Australia’s reference bill up while all three NSW network regions came down.

Am I on the Default Market Offer?

If you’ve never chosen a specific plan, or your plan is called a “standing offer”, you may be paying at or near the DMO. Your bill or your retailer can confirm this.

Conclusion

The 2026–27 rise for Adelaide electricity prices is small, but it continues a long pattern of costs moving in one direction. Comparing plans and shifting usage to midday can help. The bigger lever is reducing how much expensive evening grid power your home relies on, whether you buy a system yourself or choose a provider that does it for you.

Want to see what that looks like for your home? Send us one power bill. No cost, no obligation — and if it isn’t a good fit, we’ll tell you. Start here.