You pay fixed and energy charges. The bill also uses the highest kW demand in set periods.
What solar changes
Solar can reduce daytime grid use. If the billed peak occurs after solar output falls, solar alone will not reduce the demand charge.
What a battery changes
A battery can reduce a billed peak. It needs enough kW and enough charge for the full event.
Check before you model
Confirm this code on a current retailer bill.
Use 12 months of interval data. Check the time of each billed peak.
Check the battery power in kW against the full peak event.
2026–27 network schedule
The price signal behind this code
Network rates only. These are not retail electricity prices.
Published network rates
Access
242.1788 c/day
Peak energy
3.0721 c/kWh
Off-peak energy
3.0721 c/kWh
Peak demand
44.5311 c/kW/day
When it applies
3pm–9pm on working weekdays in November–March and June–August. All other times.
Illustrative example
Lower the EA256 monthly peak by 50 kW
The qualifying monthly peak is 50 kW lower.
The billing month has 31 days.
Other charges do not change.
50 kW × 44.5311 c/kW/day × 31 days ÷ 100Illustrative network-charge reduction: $690.23 for the month, excluding GST.
The battery or load control must cover the full peak event. Confirm the retailer pass-through.
Battery opportunity lens
Tariff screen—not a savings quote
Strong fit
Peak-demand shaving
A recurring peak inside the tariff demand window is a direct battery target. The case weakens if the maximum is rare, unpredictable or longer than the battery can sustain.
What dispatch can affect
The highest measured kW inside the tariff demand window.
Peak-period grid energy when the battery discharges at the same time.
Solar spill that can be stored without sacrificing the required peak reserve.
What it cannot erase
Daily access, metering and other fixed charges.
A peak outside the defined demand window where the tariff does not count it.
A new maximum created after the battery empties or misses dispatch.
Evidence required
At least 12 months of interval data, including every billed maximum.
Demand timestamps, seasonal windows and billing reset rules.
Battery power and duration tested against the full peak event.
Retailer rates plus the network tariff—not a blended cents-per-kWh assumption.