South Australia is one of the best places in the country to own a battery. It has some of the highest rooftop solar uptake in the world, and more than 11% of homes now have a battery.
But two homes with the same battery can end up with very different bills. A lot of that comes down to the plan behind it.
Most batteries don't respond to the market
Self-consumption is the standard setting on most home batteries. Solar charges it during the day and the home draws it down overnight. It's a straightforward routine and it does bring bills down compared with no battery at all.
What it can't do is react to the market. The battery doesn't know when wholesale prices have dropped low at lunchtime or jumped after the sun goes down on a hot day.
A battery can bring your bills down on any plan. How far down depends on the plan it's connected to.
Amber customer John Noonan is one example. His 48kWh battery earned about $600 in roughly 90 minutes on Australia Day 2026, when a seaside town in SA hit 49.5 degrees and wholesale prices spiked well above $1 per kWh through the evening peak. His three-phase connection lets him charge or discharge at around 30kW, and his plan lets him sell at the live price. Results vary, but it shows what a battery can do when the plan lets it.
Why a fixed plan limits what your battery can do
On a traditional plan you pay a set rate for what you use and get a set rate for what you export, whatever the wholesale price is doing. Many SA plans pay only a few cents per kWh for exports, and the higher rates on offer usually stop after the first 8kWh a day. Fixed export rates are simpler for retailers to offer. Even plans with a higher evening rate set it in advance, so it doesn't change with what the grid is actually doing.
Prices swing both ways in South Australia
On 31 August, rooftop solar met 99.9% of South Australia's electricity demand at 1.30pm, according to AEMO. That kind of midday supply can push prices below zero. In January to March 2026, South Australia had negative or zero prices almost a third of the time. Later in the day, as solar fades and demand holds, prices can climb again.
On some days, that creates two openings for a battery: charge when prices are low and export when they're higher. A battery on a fixed plan can't follow either, because the plan never shows it the live price.
What Amber does differently
We pass wholesale prices through at cost and earn a flat monthly $25 subscription instead of a margin on your energy, so our income doesn't rise or fall with your bill. Wholesale pricing applies to what you buy and what you export, so there's no fixed rate standing between your battery and the market. That works both ways, as you're exposed to high prices as well as low ones, so how the battery is timed matters.
SmartShift, our battery automation, watches the market for you. It charges your battery when prices are low, holds that charge and exports when prices climb. You can leave it to make the calls or run your battery manually if you'd rather. Not every battery is compatible, so check yours here.
Why battery automation makes sense in South Australia
Big spikes don't happen every day, but prices still move through the day. On a wholesale plan, those movements become something your battery can act on. It can charge when prices are low, export when they climb, and let automation watch the market so you don't have to. How much that's worth depends on the day and your setup.
If your battery isn't doing as much as you hoped, the plan behind it is worth a look.
Get a quote with Amber and see what your battery could be saving you.
