Average Electricity Bill by Household Size: Compare Fairly

An average electricity bill by household size can help you decide whether to investigate a bill, but only if you know what sits behind the average. A two-person apartment using gas hot water is not a useful dollar-for-dollar comparison for a two-person all-electric house in a cold region. Start with energy use, then look at the price of that energy.

Quick answer

An average electricity bill by household size is a starting point, not a spending target. Compare daily electricity use with a similar household in the same climate and season, then apply your own tariff. Solar, gas appliances, heating, time at home and fixed supply charges can make two equally sized households receive very different bills.

Average electricity bill by household size: usage comes first

A bill combines several things: electricity imported from the grid, the prices applying when it was used, fixed charges and any credits or adjustments. Household size influences some of the first component. It does not determine the others.

For example, two households can import the same 900 kWh over a billing period but pay different amounts because their usage rates and supply charges differ. Another household can import less yet pay more after a promotional credit ends. Looking only at the final amount hides those distinctions.

Before comparing, write down the number of days, imported kWh, usage charges, supply charges and credits. If the bill crosses a rate change, keep the two sets of rates separate. A comparison becomes much more useful once you can say whether the difference is consumption, pricing or both.

What the official benchmarks actually measure

The Australian Energy Regulator’s benchmark publication explains that consumption comparisons on relevant residential bills are intended to help households understand their usage against others in their area. The publication describes a 2020 study and subsequent 2021 updates; it is not a new survey of September 2026 household bills.

The following small extract from Table 16 of the commissioned report illustrates why season and household size should be considered together. These are historical electricity-consumption benchmarks for NSW Climate Zone 5, which includes greater Sydney. They are not national averages, current plan prices or a target for your own household.

Source period: December 2020 report, Table 16. Use the source’s location and seasonal definitions when interpreting it. The figures demonstrate a pattern; they do not establish what a particular household should spend today. Check the comparison information on your current bill and the AER publication for applicable updates.

Turn your own consumption into a comparable daily figure

Divide the billed kWh by the billed days. If your statement records 1,080 kWh over 90 days, the average is 12 kWh a day. A different statement showing 1,200 kWh over 100 days has the same daily average despite its larger total.

Keep the period visible. An average over a mild spring month should not be treated as an annual forecast for a home with substantial winter heating. Where possible, compare the same season last year and also look at a full twelve months.

If a household member moved in halfway through a period, note the date rather than assigning the entire bill to the new household size. The same applies to holidays, guests and a change from office work to working at home. A brief diary can explain more than a national headline statistic.

Calculate a bill using explicit assumptions

Here is an arithmetic example, not a current electricity offer. Assume 900 kWh over 90 days, a flat usage rate of 30 cents per kWh and a supply charge of $1 a day. Usage costs $270 and supply costs $90, producing $360 before any other applicable items.

At the same consumption, a hypothetical rate of 35 cents and supply charge of $1.20 would produce $315 plus $108, or $423. The $63 difference comes entirely from the invented tariff assumptions, not a change in family size or appliance efficiency.

Use the electricity cost calculator with rates from your own bill. A time-of-use or demand tariff needs a more detailed calculation than a single average price. Do not enter a discounted headline rate unless it applies to the usage you are modelling.

Shared appliances explain why per-person comparisons can mislead

A fridge is usually running whether one person or several people are home. Heating a shared living room may require much the same energy with two occupants as with three. Other activities, including showers, laundry and cooking, can increase with the number of people and their routines.

That makes “bill divided by people” a rough household budgeting tool, not an efficiency score. Someone living alone can have a higher cost per person without using appliances carelessly. Conversely, a crowded household may have a low per-person figure while still having a large total bill.

List the major services first: space heating, cooling, hot water, cooking and refrigeration. Note which use electricity and which use another fuel. Comparing electricity alone can make a gas-heated home appear cheaper even though some of its energy spending is on another bill.

Solar changes what the electricity meter sees

Grid imports are not always total household electricity use. Rooftop solar can power appliances directly, reducing imported kWh without reducing the service those appliances provide. Export credits then affect the dollar bill separately.

For a solar home, distinguish imported electricity, exported electricity and self-consumed generation if the monitoring system provides it. Do not subtract export kWh from import kWh and call the result household consumption. They are different flows with potentially different prices.

A near-zero bill after credits does not prove the home used almost no energy. Equally, losing a generous export rate can increase the bill even if imports remain unchanged. Our guide to moving into a house with solar panels explains the equipment and account details worth checking.

Heating, occupancy and equipment deserve a separate note

Record whether the property is an apartment or detached home, which rooms are heated and whether the household is home during the day. Insulation, draughts, shading and appliance settings can alter the energy needed for the same level of comfort.

If you are looking for practical improvements, Energy.gov.au’s appliance guidance is a useful starting point. Focus on equipment and habits relevant to the home rather than assuming every household can make the same changes. Renters may need permission for permanent work, and essential medical equipment should not be switched off to chase a comparison number.

For refrigeration specifically, use our fridge running-cost guide. It separates annual energy consumption from purchase cost and shows why replacing an appliance purely for a small electricity saving needs a payback check.

A higher-than-expected result needs investigation, not blame

First confirm whether the meter reading was actual or estimated. Then check whether the billing period is longer than usual, a previous balance was carried forward, or a credit was removed. These can change the amount due without indicating a sudden appliance problem.

Next compare daily usage over similar weather and occupancy periods. If it genuinely increased, look for a new appliance, changed heating schedule, hot-water issue or equipment left operating longer. Ask the retailer for interval data where available; an electrician or licensed technician should investigate suspected faults.

If the main change is price, obtain comparable offers for your address. If the difficulty is paying, contact the retailer about assistance early. A bill comparison should help identify a next step, not suggest that an essential household need is unreasonable.

Build a comparison you can repeat

Keep a simple record with these columns: bill dates, days, imported kWh, kWh per day, supply charge, usage charges, credits, household size and notes. Add a row whenever a bill arrives. Over time this makes seasonal patterns and tariff changes easier to distinguish.

When another person shares their bill, ask the same questions before drawing a conclusion. Does the home have solar? Is hot water electric? Is the amount monthly or quarterly? Does it include a government credit or an old balance? The missing detail is often the explanation.

You can then compare electricity plans using your own usage and address. The useful outcome is an informed household budget and a shortlist of practical changes, not a promise to match someone else’s bill.

Sources and review

The CompareUs Editorial Team reviewed the linked sources on 28 September 2026. The benchmark extract is deliberately dated and geographically limited. All tariff calculations in this guide are hypothetical examples, not advertised plans, current national averages or guaranteed savings.