Wholesale vs Retail Electricity in Australia: Should Your Business Switch?
Electricity isn't a fixed-price commodity. Generators sell power on a wholesale market to retailers, who then bundle it into the flat rate on your bill. Most of that trading happens through the National ElectricityMarket (NEM), where prices shift every five minutes, bottoming out near zero around midday and spiking several times higher by evening.
AEMO's Q3 2025 report put the NEM average at $87/MWh, down 27% on the same quarter the year before. That's significant movement in a short window, yet some retailers flatten it into a single number.
When you sign a fixed-rate contract, you're paying for two things: the electricity, and an insurance premium against price swings you never see. In 2026, that gap has become large enough to question whether the insurance is still worth it.
For a business with flexible load or battery storage, that markup is increasingly avoidable. Pair a wholesale-linked tariff with smart automation and start capturing the spread yourself. This guide walks through how the two markets work, what arbitrage actually looks like in 2026, and how to tell whether switching would be suitable for you.
How it Works
Australia's electricity system runs on two parallel markets: Wholesale and Retail.
Every five minutes, generators bid into the market. AEMO ranks them from cheapest to most expensive. Solar and wind sit at the bottom because their fuel is free, while coal and gas sit higher. AEMO works up the stack until demand is met, and the price of the last generator dispatched sets the wholesale price for everyone. That's why prices crash near zero when solar floods the grid at midday, and spike when coal and gas have to fire up to cover the evening peak.
The retail market is where your business buys power from a retailer like Origin or AGL. Retailers buy in the wholesale market at variable prices, then resell to you at fixed (or peak or off-peak) rates. The difference covers their margin, hedging costs, and the risk premium they charge for absorbing volatility on your behalf.
What Arbitrage is
Arbitrage is buying low and using or selling high. That means charging a battery when wholesale prices are cheap (oftenunder 5c/kWh during the midday solar window) and drawing on that stored energy when peak rates hit 35–50c/kWh.
Queensland recorded 25.9% of dispatch intervals at zero or negative prices in Q3 2025. Daily wholesale spreads regularly exceed $100/MWh, with peaks above $400/MWh. If your business can capture that spread, the wholesale-to-retail margin you used to pay your retailer becomes a saving you keep.
Wholesale Vs Retail trade-offs
A real-world example
An Adelaide manufacturer using 250 MWh per year on a 30c/kWh retail contract pays around $75,000 annually.
On a representative day in January 2026, NEM spot prices ran below 5c/kWh from 10 am to 2 pm and exceeded 35c/kWh from 6 pm to 8 pm — a 30c/kWh spread captured cleanly by a battery dispatched at the right moments.
Add a 100 kW solar system, a 200 kWh BESS, and a wholesale-linked tariff, and that same business can:
- Self-consume around 60% of solar generation, displacing retail-priced imports
- Charge the battery from low overnight wholesale prices
- Discharge during the 5–9 pm peak
- Flatten peak demand, reducing network charges
- Keep operations running through outages
Possible Risks
Spike exposure. Without storage, a single heatwave afternoon on a wholesale plan can wipe out months of savings. Four small Australian retailers have collapsed since 2022 under sustained wholesale pressure.
Compressed spreads. As more batteries come online, the gap between cheap and expensive periods narrows. NEM battery revenues fell 61% in September 2025 from August highs.
Negative feed-in tariffs. Some networks now charge for solar exports during oversupply periods. Without smart control, you can pay to send power back.
Contract switching costs. Check your existing retail contract for exit fees and confirm your site has an interval-capable smart meter — wholesale plans require one.
See your actual savings
Send us a copy of your recent electricity bill and your meter data, and we will use our custom-built tool at Power Tech Energy to calculate exactly how much your business would have saved over the past 12 months on your real consumption.
FAQ
Can SMEs access wholesale electricity prices?Yes. Retailers including Flow Power, Amber Electric and Energy Locals offer wholesale-linked plans for small to medium businesses. Eligibility depends on consumption, state, and meter type.
Do I need solar to benefit from a wholesale plan? No, but the case is stronger with it. A battery alone can arbitrage between cheap overnight grid power and expensive evening peaks. Adding solar lets you also capture low-cost midday energy.
What's a typical payback period for a commercial battery? 5–8 years, depending on load profile, sizing, retail contract, and whether smart automation is included.
Is wholesale electricity always cheaper than retail? Over a full year in normal conditions, yes — but not in every interval. Pairing wholesale exposure with battery storage captures the cheap intervals while shielding you from the expensive ones.
