If you already have solar
You might assume the offer doesn’t for you, you’re already making your own free power at midday. But there are real angles worth looking at:
- Winter and overcast days: When your array is producing at a fraction of its capacity, free grid power between 11am and 2pm covers the gap and can top up your battery for the evening peak.
- Battery charging: Charging from the grid at $0 and discharging into a 43-cent peak is a strong arbitrage, especially in the cooler months.
- Bigger loads than your array: If you’ve added an EV or electrified your heating and hot water, your midday demand may now exceed what your panels can supply.
Why a battery is the strongest way to use this offer
The Midday Power Saver rewards you for using power between 11am and 2pm. The problem for most households is that the power they actually need is at 6pm; dinner, heating, hot showers, the dryer, the EV plugged in for the night. Those are the hours the new tariff charges the most for.
A home battery is the piece of equipment that solves that mismatch. It lets you take energy at 11am and spend it at 6pm.
It works when your solar can’t.
On a clear summer day your panels already fill the battery for free. The gain shows up on the days your array underperforms: winter, cloud, rain, short daylight hours, or a home that has electrified faster than its solar system has grown. Those are exactly the days your evening consumption is highest. A battery paired with this offer means the evening peak is covered every day of the year, not just the sunny ones.
Three things to get right:
- Charge rate. The free window is only three hours long, so how fast your battery charges matters as much as how big it is. At 5kW you can put roughly 15 kWh in; at 2.5kW you’ll only manage 7.5 kWh no matter how large the battery. If a battery can’t fill itself inside the window, part of its capacity sits idle.
- Scheduled grid charging. The battery needs to be configured to charge from the grid on a timer, not just from surplus solar. Most modern systems handle this well, but it’s a setting that has to be deliberately enabled. If you’re signed up to a VPP or a retailer control program, check how that interacts before you switch plans.
- The fair use cap. Charging a battery and an EV simultaneously inside the same three hours can push you over the cap on the free period. Anything above it is billed at the solar soak rate — still cheap, but not free. Sequencing the two matters.