Do home batteries really cut your bill? What AEMO's latest data shows

Between 4 pm and 9 pm, when households and businesses ramp up cooking, heating and lighting, the NEM still needs flexible generation. For years that role fell to gas plants setting high spot prices. In Q3 2026, AEMO reported grid-scale batteries supplied 8% of evening peak generation, beating gas-powered generation at 5.1% for the first time in any quarter.

AEMO attributed part of the shift to batteries charging on cheap daytime solar and discharging into the peak. The operator also noted batteries were setting prices in almost half of dispatch intervals, up from 18% a year earlier, and that increased battery activity contributed to lower evening peak prices.

At home, the same logic applies at smaller scale. A home battery stores surplus solar instead of exporting it for a few cents per kWh, then covers dinner-time loads that would otherwise hit peak tariffs. AEMO reported that sample data showed households with rooftop solar and batteries drew around three-quarters less electricity from the grid during the evening peak than households with rooftop solar alone.

Average NEM wholesale electricity prices, which contribute to retail prices over time, were $63/MWh in the September 2026 quarter according to AEMO. That was down 27% year on year and down 15% from the June 2026 quarter, the lowest September quarter average since 2021.

By region, AEMO reported year-on-year falls to $56/MWh in Victoria (-27%) and Tasmania (-38%), Queensland $61/MWh (-15%), South Australia $69/MWh (-34%) and New South Wales $74/MWh (-17%).

Lower wholesale prices help eventually, but a typical bill still bundles network charges, environmental costs, metering and retail margin. If you use most of your power between 4 pm and 9 pm without a battery, you are still exposed to peak rates that reflect scarcity in that window, even when midday wholesale prices are low or negative. Our guide why power bills stay high with solar walks through the split between cheap daytime generation and expensive evening usage.

AEMO is describing the market, not promising a payback period on a 10 kWh battery in your garage. Still, the direction is consistent: more solar is pushing down daytime prices, and storage (grid-scale and behind-the-meter) is easing the evening peak. A household that only has solar without storage still exports cheap power and buys expensive peak electricity. A household with a battery can keep more of its solar for itself.

If you already have panels, start with adding a battery to existing solar. If you are comparing new solar and battery packages, check rebates through our rebate quiz and read whether a virtual power plant suits how you use the battery.

Falling wholesale prices are real. So is the lag before they show up on your bill. The part you control faster is self-consumption: less grid draw at peak, which AEMO's sample data now quantifies for solar-plus-battery homes.