Unlock Australia's wholesale energy market.

In a normal retail bill you pay a flat-ish c/kWh rate. Behind that rate, your retailer is buying power on the wholesale market, where the price changes every 5 minutes. They charge you a margin and a peak/shoulder/off-peak shape that has nothing to do with what they actually paid.

A wholesale-passthrough plan cuts that out. Your import and export prices are pegged to the AEMO 5-minute dispatch price. There’s no margin on the kWh; the retailer charges a flat subscription instead.

The reason the model works for you and not for the gentailers is that you have a battery. The battery shifts your load and generationacross the price curve. Your retailer’s control loop charges your battery in the cheapest 30–90 min of the day (often when dispatch is negative) and discharges it during the 4–9 pm peak, which on high-priced evenings can reach several times a standard feed-in rate. Prices are capped at the $20.30/kWh market ceiling.

The exposure runs both ways. A wholesale plan pegs your import price to the same dispatch price. If you draw from the grid during a price spike, you pay that spike, up to the same $20.30/kWh cap. A battery is what makes the plan workable, because it lets you avoid buying at the worst times. Whether you come out ahead depends on your usage, your retailer and how the market moves. Sunnn is not an electricity retailer and does not set these prices.

Where Sunnn fits in: a battery designed for self-consumption is a different design to one tuned for arbitrage. We size kWh for evening discharge, choose inverters that throttle smoothly with the spot curve, and pre-configure the controls so the first negative-price interval after install doesn’t go to waste.