There's no single "cheapest" electricity tariff in Australia — only the one that matches how your household actually uses power. Pick the wrong one — a flat rate when you should be on time of use, or the reverse — and you'll overpay every month without realising. The cheapest bill isn't the one with the lowest headline rate — it's the one that lines up with when you're home, cook dinner, and run the dishwasher.
So which tariff type actually suits your household — flat rate or time of use? The answer depends on when you use electricity, not just how much.
Quick answer: Flat rate charges the same per kWh regardless of time. Time of use (TOU) charges more during peak hours (typically evenings) and less overnight. If most of your electricity use lands between 2pm and 8pm, flat rate is usually cheaper. If you can shift heavy appliances to off-peak hours — or you have solar — TOU often wins. Check your smart meter data before switching.
What Is a Flat Rate Electricity Tariff?
A flat rate tariff (sometimes called a single rate or anytime tariff) charges the same price per kilowatt-hour regardless of when you use electricity. Run your air conditioner at 3am or 3pm — same rate.
The appeal is simplicity. You don't need to think about shifting your washing machine to off-peak hours. Your bill is predictable based purely on total consumption.
Flat rate pricing varies substantially by state, distributor, and retailer. For a benchmark in your distribution zone, check the AER Default Market Offer reference prices. For a view of what Australian households actually pay on real bills (not just advertised rates), the BillDecoder Index tracks bill-verified data across postcodes.
Flat rate suits households where:
- Most electricity use happens between 2pm and 8pm (peak hours on TOU)
- Nobody is home during the day to shift loads to off-peak
- You want straightforward billing with no time-based complexity
- You don't have solar panels or a home battery
What Is a Time of Use Tariff and How Does It Work?
A time of use tariff charges different rates depending on the time of day — and sometimes the day of the week. Electricity is divided into peak, shoulder, and off-peak periods.
A typical TOU structure:
- Peak: Roughly 2pm to 8pm on weekdays — the most expensive period
- Shoulder: Roughly 7am to 2pm and 8pm to 10pm on weekdays, plus daytime on weekends — moderate pricing
- Off-peak: Roughly 10pm to 7am daily, plus some weekend periods — cheapest period
The exact time bands differ by state and distributor. Ausgrid in NSW uses different peak windows than Powercor in Victoria. Your distributor (the company that owns the poles and wires) sets the time bands, not your retailer. Check your own bill or your distributor's website for the specific windows that apply to you.
Current peak, shoulder, and off-peak rates vary significantly by plan, retailer, and distribution zone — headline rate ranges change with every regulatory cycle and every retailer price review. For a current benchmark in your region, your retailer's plan summary or the AER Default Market Offer gives you the numbers that actually apply to you.
TOU tariffs reward you for shifting electricity use away from expensive peak periods. If you can run your pool pump, washing machine, dryer, and dishwasher during off-peak hours, the savings add up over the year.
Which Tariff Is Cheaper for Most Households?
There's no universal answer. It depends entirely on your consumption pattern.
A household where two adults work from home and cook dinner at 6pm often finds flat rate cheaper — because a large share of their usage falls in peak TOU hours. A household where nobody is home until 8pm and heavy appliances run on timers overnight typically saves meaningfully on TOU.
The practical rule: the larger the share of your usage that falls in peak hours, the more attractive flat rate becomes. If most of your usage can shift to off-peak and shoulder periods, TOU typically wins. Exactly where the tipping point sits depends on the specific peak/off-peak spread on the plans you're comparing — which is why modelling both against your own 12-month usage history matters more than any rule of thumb.
The AER's Default Market Offer publishes reference prices for both flat rate and TOU tariffs each year, setting price caps in areas without state-based regulation. Comparing the reference prices for your distribution zone gives you a rough benchmark before diving into retailer-specific plans.
Does Solar Change the Equation?
Significantly. If you have rooftop solar, TOU tariffs often make more sense — even if your usage pattern wouldn't normally suit one.
Why? During the middle of the day (typically between 10am and 3pm, when panels are generating most output), you're either using that free electricity or exporting it for a feed-in tariff. That means you're buying very little grid power during shoulder periods.
Your remaining grid purchases happen mostly in the evening (peak) and overnight (off-peak). If you can shift evening loads — running the dishwasher after 10pm, pre-cooling your home while solar is generating — you minimise the amount of expensive peak power you buy.
Households with solar and a battery have even more flexibility. A battery charged during the day can discharge during peak hours, effectively replacing peak grid power with stored solar energy.
How Do You Figure Out Which Tariff Is Best for You?
Three steps:
- Check your current tariff. Look at the "Tariff Type" on your bill. It might say "Peak/Off-Peak", "Time of Use", "Single Rate", or "Flat". If you're unsure, call your retailer.
- Review your usage pattern. If you have a smart meter, your retailer's app or the Energy Made Easy website can show when you use the most electricity.
- Model both options with real data. Ask your retailer to run a comparison using your actual consumption history. Don't rely on estimates — use at least 6 months of real data, ideally 12.
If you're on TOU and your bills feel too high, the first number to check is what percentage of your usage sits in peak hours. If it's a large share, you're probably on the wrong tariff for your household.
How Do You Switch Between Tariffs?
If you have a smart meter (digital meter), you can usually switch between flat rate and TOU by contacting your retailer. In Victoria, smart meters are standard in most homes — a legacy of the state's mandatory rollout. In NSW, Queensland, and South Australia, smart meter coverage is expanding under the national rollout but is not yet universal.
If you still have an old accumulation meter (the one with spinning dials), you're almost certainly on a flat rate tariff. Switching to TOU would require a meter upgrade, which your distributor handles — sometimes at no cost, sometimes with a fee, depending on distributor and circumstances.
Before switching, ask your retailer for a comparison based on your actual usage data. If you have a smart meter, your distributor already records your consumption at 30-minute intervals. A retailer should be able to model what your last 12 months would have cost on each tariff type.
What's the Single Biggest Mistake With Tariff Choice?
Guessing without looking at the data. People pick flat rate because it feels safer, or pick TOU because a retailer pitched "cheaper off-peak rates" — without ever comparing their own 12 months of usage against both options.
If your household is already on a smart meter, the information needed to pick correctly is sitting in your bill data right now. The hardest part is knowing what to look for.
If you want a second opinion on whether your current tariff fits your actual usage pattern, you can upload a recent bill for a free independent analysis — it will tell you what you're paying, where the money goes, and whether your current setup is working in your favour.
Frequently Asked Questions
Is time of use electricity cheaper than flat rate in Australia?
It depends on when you use power. TOU is cheaper if you can keep most usage in off-peak and shoulder periods. If a large share of your usage falls in peak hours (typically 2pm–8pm weekdays), flat rate is usually the better option.
Can I switch from time of use to flat rate?
Yes, if you have a smart meter. Contact your electricity retailer and ask to change your tariff assignment. The switch typically happens within one billing cycle.
What are peak hours for electricity in Australia?
Peak hours vary by state and distributor but are generally between 2pm and 8pm on weekdays. Exact time bands are set by your local distributor, not your retailer. Check your bill or distributor's website for the specific windows that apply to you.
Does solar make time of use tariffs better?
Usually, yes. Solar panels generate during middle-of-day hours, reducing the grid power you buy in that period. Most of your grid purchases shift to off-peak (cheap) and peak (expensive, but reducible with load shifting or a battery).
How do I find out what tariff I'm on?
Check the tariff type listed on your electricity bill, usually on the first or second page near the usage charges. You can also call your retailer or log into their app to confirm your current tariff.
So — do you actually know what tariff you're on right now? And does it match how your household actually uses electricity? If you're not sure, pulling out your last bill (or letting an independent tool do the reading for you) is the cheapest five-minute check you can make this month.
Last updated: April 2026