How to Reduce Electricity Demand Charges: A Load-Timing Plan
Learn how to reduce electricity demand charges with interval data, load scheduling and tariff checks. See why lower daily kWh may not reduce the peak.
CompareUs Editorial TeamConsumer utilities editorial team
How to reduce electricity demand charges is a timing question before it is an energy-saving question. If several large loads run together during the tariff’s measured window, a short busy period can influence a much longer part of the bill. The practical task is to find that overlap and change what is genuinely flexible.
Quick answer
To reduce electricity demand charges, first identify the exact charging window, measurement interval and reset rule on your tariff. Then separate flexible high-load activities so they overlap less within that window. Check the resulting interval data. Lower total daily consumption alone does not necessarily lower the maximum demand used to calculate your bill.
How to reduce electricity demand charges on your actual tariff
Put the latest bill beside the current offer document. Find the demand rate, its unit, the eligible hours and days, and the period over which the maximum is selected. Also check seasonal changes, minimum billable demand and whether a previous peak carries forward.
ActewAGL’s published explanation describes a monthly maximum based on a thirty-minute interval, with the maximum resetting each calendar month. That is a useful example, not a rule for every Australian plan. A quarterly bill can contain separate monthly demand calculations rather than one quarterly maximum.
Our demand-tariff explainer covers the basic terminology. This guide focuses on a household schedule you can test, without assuming your charging window or rates.
Find the intervals that actually set the charge
Request or download interval data and identify the highest eligible intervals in each billing month. Check whether the file records energy in kWh or average demand in kW. Also confirm its timestamps and time-zone convention before matching it to a tariff window.
For a thirty-minute interval, divide kWh by 0.5 hours to obtain average kW. Thus 2.5 kWh over half an hour represents 5 kW average demand. That is not the same as a five-kilowatt appliance running all day, and it is not necessarily an instantaneous spike.
Keep several high intervals, not only the single maximum. If they repeatedly occur during the same household routine, you have a useful scheduling target. If one interval looks unexplained, check missing data, estimates and unusual activity with the retailer before drawing a conclusion.
Separate flexible loads: a worked example
Imagine a home with a steady 1 kW background load during two consecutive half-hours. It also needs to run a 2 kW appliance for half an hour and another 2 kW appliance for half an hour. These deliberately simple assumptions exclude cycling and are not typical appliance specifications.
| Schedule | First half-hour average | Second half-hour average | Total energy in the hour |
|---|---|---|---|
| Both appliances together | 5 kW | 1 kW | 3 kWh |
| Appliances run one after the other | 3 kW | 3 kW | 3 kWh |
The second schedule uses the same energy but has a lower maximum. If these were the highest relevant intervals for the whole month, the billable peak could fall from 5 kW to 3 kW. If another evening still reaches 5 kW, the month’s maximum would not fall.
At an invented rate of $0.20 per kW per day over 30 days, those maxima would produce $30 and $18 demand charges: a $12 difference. Usage charges, daily supply and other costs remain separate. This is an explanation of arithmetic, not an offer or guaranteed saving.
Build a routine people can follow
List the activities behind the high intervals and classify them as essential now, movable within the window or movable outside it. Cooking a family meal may be much less flexible than starting a dishwasher. A routine that requires everyone to remain uncomfortable is unlikely to last.
Choose one or two changes first. For example, finish one compatible appliance cycle before starting another, or schedule a flexible load outside the relevant window. Check manufacturer instructions and household safety before using timers or remote switching.
Our smart-meter data guide can help you compare the result with the previous routine. Note holidays, weather and occupancy changes so they are not mistaken for the effect of the schedule.
Check the rest of the electricity price
Moving a load can change its usage price as well as demand. If the plan has time-of-use rates, calculate the relevant kWh at the new time. Do not assume every hour outside the demand window is also the cheapest usage window.
Likewise, avoid moving all deferred loads into one new interval without checking the tariff. You may simply create another eligible maximum. Where several household members control appliances independently, a shared schedule can be more useful than an automation rule nobody understands.
If your priority is a less complicated bill, compare electricity plans using actual consumption and the available tariff options. A plan without demand charges is not automatically cheaper once its usage and supply rates are included.
Understand solar and battery limits
Solar only reduces grid demand while it is producing enough electricity at the relevant time. An afternoon generation surplus does not automatically offset an evening maximum in the demand calculation. Look at imports during the charged interval, not the day’s net energy balance.
A battery can also be constrained by discharge power, state of charge, reserved capacity and its operating settings. Ask the installer whether peak management is supported and how it interacts with backup or other commitments. Do not change electrical settings beyond the safe user controls described in the manual.
Buying a battery solely to solve a modest demand charge needs a full cost comparison. Start with the recorded annual demand charges and realistic achievable reductions; do not assume the entire electricity bill would disappear.
Know what happens after a peak is recorded
On a monthly-maximum tariff, a high interval early in the month can already establish the floor for that month’s maximum. Continuing a safer, flatter routine is still useful, but it cannot rewrite historical data. Check the next reset date so expectations match the contract.
Ask about other tariff choices if your essential routines consistently create a high maximum. AGL’s current tariff page, reviewed on 28 September 2026, says it no longer offers demand tariffs to homes not already using one. This is specific to AGL; availability and change conditions still need an address-based check.
A short review before the next bill
Save the original peak, the proposed schedule, the new eligible maximum and the number of days used in the calculation. Reconcile the bill’s demand line with the stated rate and units. If the numbers do not agree, ask the retailer to identify the interval and calculation used.
Keep comfort, health and safety ahead of a small tariff saving. The useful outcome is a repeatable household routine or a better-suited plan, not constant monitoring of every switch. The CompareUs Editorial Team’s examples are hypothetical and should be replaced with your own tariff and interval data.
Where should you go next?
FAQs
Does using less electricity always reduce demand charges?
No. The bill may depend on the highest eligible interval rather than total consumption. You can reduce daily kWh while leaving that maximum unchanged. Check both the usage and demand components of the tariff.
Can I undo a high peak later in the month?
Not under a tariff that uses the highest recorded interval for that month. Lower later intervals do not erase it. They can help prevent an even higher maximum and show whether your new routine is working for the next reset.
Do all demand tariffs use the same hours?
No. Charging windows, seasons, intervals, minimums and reset rules vary. Use the current retail offer and bill rather than copying another household’s hours or a generic afternoon-to-evening window.
Will solar remove my evening demand charge?
Not necessarily. Solar may produce little during the relevant evening interval. A battery’s contribution also depends on its power, available charge and controls. Check measured grid demand rather than assuming equipment eliminates the charge.
Should I switch appliances off at the wall?
Only where it is safe and consistent with the appliance instructions. Do not interrupt medical equipment, refrigeration, safety systems or other essential loads to chase a lower peak. Focus on genuinely flexible activities.
Can I move to a plan without demand charges?
Ask the retailer what is available for your address and metering arrangement. Compare the complete annual cost, not just the absence of a demand line. A different plan can have different usage and supply rates.