Going Off-Peak: Load Shifting for Real Households

There are two ways to cut an electricity bill: use less power, or use the same power at cheaper times. The first requires sacrifice. The second just requires a schedule — and for households with solar or a time-of-use tariff, it is the single most underrated saving available. This is load shifting, and it is far easier than the name suggests.

Why the time of day changes the price

If you have rooftop solar, electricity in the middle of the day is close to free — anything you do not use is exported for a feed-in tariff of just a few cents. Grid power in the evening peak, by contrast, can cost thirty cents or more per kilowatt-hour. On time-of-use tariffs the gap is written directly into your plan: peak, shoulder, and off-peak windows with very different rates. Either way, the same load of washing costs a fraction as much at midday as it does at 7pm.

The easy wins: appliances with delay buttons

Start with the machines that already have timers. Dishwashers, washing machines, and dryers almost all offer a delay-start function that nobody uses. Load the dishwasher after dinner, set it to run at 11am, and it now runs on sunshine instead of peak power. A pool pump is an even bigger prize — it is one of the largest single loads in any home that has one, and shifting its run time to daylight hours is one setting change on the controller, done once.

Hot water: the storage you already own

An electric hot water tank is effectively a thermal battery. If yours heats overnight on an old off-peak arrangement but your roof has solar, ask about switching it to a daytime timer so the sun heats your showers instead. Heat pump hot water systems make this even better, since they use a fraction of the energy in the first place and nearly all of them have built-in scheduling.

Charging things that sit around anyway

Laptops, cordless vacuums, power tool batteries, e-bikes, and especially electric vehicles all spend hours plugged in. None of them care when they charge — but your bill does. An EV charged from midday solar can run for a cost per kilometre that petrol cannot approach; the same car charged nightly through the peak window quietly erodes the saving.

Keep it realistic

The goal is not to reorganise your life around a tariff. Pick the three biggest movable loads in your home, set their timers once, and let automation do the remembering. Most households can shift a quarter of their consumption without noticing any change in comfort — and the result shows up on the very next bill.