Electricity pricing is no longer simple. Flat rates are fading, and time-of-use tariffs are taking their place. The idea is straightforward: pay less when demand is low and more when it spikes. But smart pricing only works if it fits your lifestyle. How do you check if a time-of-use (TOU) tariff is right for you? Here’s how to work it out.
Know What You’re Really Signing Up For
Before you compare plans from retailers like Red Energy and others in the Australian market, understand what a time-of-use tariff measures. It doesn’t focus on how much electricity you use overall – it focuses on when you use it.
Most Time-of-Use (TOU) structures break the day into three windows: peak, shoulder, and off-peak.
Peak usually sits in the late afternoon and early evening when households switch on ovens, air conditioning, televisions, and hot water systems. Off-peak tends to land overnight. Shoulder falls somewhere in between.
Note: Not all energy distributors will support TOU in your area.
The price gap can be dramatic. In some states, peak rates can be double the off-peak rate. That difference is what matters most.
Start With Data, Not Guesswork
The biggest mistake households make is assuming they know their usage pattern.
Smart meters are now standard across much of Australia, which means you can access interval data – half-hourly or hourly consumption.
Pull three months of data or, better yet, twelve. Look at weekdays separately from weekends. Work-from-home patterns matter. School holidays matter. Summer and winter can be very different.
Ask yourself three practical questions:
- When is the air conditioner running?
- When does the electric hot water system heat?
- When are large appliances switched on?
In Queensland, New South Wales, and Victoria, air conditioning loads in summer are often the dominant drivers of peak costs. In South Australia, winter heating can be just as significant.
If most of your heavy load sits between 4 pm and 9 pm, a TOU tariff may cost you more than a flat rate.
Map Your Lifestyle Honestly
Are you home during the day? Do you work night shifts? Do you cook dinner at 7 pm? Do teenagers take 20-minute showers at 6 pm?
Time-of-Use rewards flexibility.
Retirees who are home during daylight hours often benefit. They can run the washing machine at 10 am. They can pre-cool the house before peak. Families with two working adults who return home at 6 pm and switch everything on at once may find it harder to save.
Electric vehicle owners need special attention here. Charging after 10 pm can be very cheap under many tariffs. Charging at 6 pm isn’t. The tariff is about behaviour; if your behaviour is fixed, the tariff must fit that reality.
Understand the True Peak Window in Your State
Peak windows aren’t identical across Australia. In Victoria, peak commonly spans mid-afternoon to late evening. In New South Wales, it often starts slightly later. In South East Queensland, summer peaks can be wide because of air conditioning loads.
You need the exact hours from your retailer’s tariff sheet – not a marketing summary. Check the formal tariff schedule.
Overlay those hours against your interval data. If 40% or more of your usage falls within the peak, you need to be cautious.
Consider Your Appliance Profile
Your home’s technology matters as much as your habits.
Do you have:
- Electric resistance hot water
- Ducted air conditioning
- Pool pumps
- Electric slab heating
- A large solar system
- A home battery
Each of these shifts the equation.
Pool pumps are easy to move to off-peak hours – that’s a win. Electric hot water can often be controlled to heat overnight – another win. Ducted air conditioning running at 5 pm on a 38-degree day in Sydney is a cost multiplier under TOU.
Solar changes things. If your solar system generates strongly during shoulder periods, you may avoid buying peak power altogether. But remember, solar fades just as peak rates often begin. Without a battery, evening consumption is still exposed.
A battery can help you take advantage of the tariff: charge off-peak and discharge during peak. That’s where TOU becomes strategic rather than reactive.
Run a Simple Scenario Test
You don’t need complex modelling. Take one month of interval data. Multiply the energy used in each time block by the proposed tariff rates. Compare the total with what you would have paid under a flat rate. Do this for summer and winter months.
Be realistic. Don’t assume you will suddenly change all your behaviour. If you plan to shift loads, test two scenarios: one with current behaviour and one with achievable changes.
The numbers will tell you more than any sales pitch.
Make the Decision With Eyes Open
Time-of-Use (TOU) tariffs are tools. In the right household, they can cut costs. In the wrong one, they can amplify them. The key is alignment. Prioritise data, then lifestyle, and finally, the retailer.
Don’t choose based on brand or marketing. Choose based on how your household actually consumes electricity at 6 pm on a Tuesday in February.
Speak with our team if you need help comparing your options.