Load factor is one of the quickest ways to describe a commercial electricity profile. It tells you whether the site uses power steadily or spends most of the month at a modest level before hitting a short, sharp peak.
That matters because two businesses can use the same annual kWh and still present very different demand and pricing risk.
I’m Joe from Smarta Switch in Brisbane. We review commercial electricity profiles for contract and bill decisions. We’re paid by the energy retailer when you switch, never by you.
The short answer
Electricity load factor is average demand divided by maximum demand over the same period.
The formula is:
Load factor (%) = average demand / maximum demand x 100
If a site averages 100 kW during a month and reaches a maximum of 250 kW, its monthly load factor is:
100 / 250 x 100 = 40%
A 40% result means the average load was 40% of the recorded peak. It does not tell you whether the business is efficient on its own. It tells you the shape needs investigation.
How to calculate load factor from energy and demand
Most bills show energy in kWh and may show maximum demand in kW or kVA. To calculate load factor, first turn the energy total into average demand.
Step 1: calculate average demand
Average demand (kW) = energy used (kWh) / hours in the period
For a 30-day billing period, there are 720 hours.
If the site used 72,000 kWh:
72,000 kWh / 720 hours = 100 kW average demand
Step 2: divide by the matching peak
If maximum demand was 250 kW:
100 kW / 250 kW x 100 = 40% load factor
The units must match. Do not divide average kW by peak kVA unless you are deliberately adjusting for power factor and understand the measurement basis.
The kVA, kW and kWh guide explains those units in plain English.
Why the time period matters
A daily, monthly and annual load factor can each tell a different story.
- Daily load factor can expose one shift, one production run or one demand spike.
- Monthly load factor helps relate the profile to the billing period and billed maximum demand.
- Annual load factor smooths seasons and is useful for procurement, but can hide short events.
Always use average demand and maximum demand from the same period. A yearly energy total divided by one month’s peak is not a valid annual load factor.
Also check the demand interval. Networks and retailers may use interval-based demand, and the bill can apply tariff rules such as a ratchet, minimum demand or capacity reservation. The largest interval in a data file is not always identical to the number billed.
What a high load factor can mean
A relatively high load factor means the average demand sits closer to the maximum demand. Common examples include continuous manufacturing, cold storage, data centres and facilities with steady process loads.
Possible advantages include:
- a more predictable load profile;
- less difference between average and peak capacity;
- easier volume forecasting; and
- fewer extreme peaks relative to the site’s normal operation.
But a high load factor is not automatically efficient. A business can produce a high percentage by running unnecessary plant all night. That is why baseload must be reviewed beside the ratio.
What a low load factor can mean
A relatively low load factor means maximum demand is much higher than average demand.
That can come from:
- several large motors starting together;
- heating, cooling or refrigeration cycling at the same time;
- EV charging stacked onto an existing peak;
- a short production batch;
- one abnormal operational event;
- a demand spike during site start-up; or
- very short operating hours with high equipment load.
The ratio tells you where to look. It does not tell you whether the peak can safely or economically be removed.
Why load factor matters to the electricity bill
Demand charges
On a demand tariff, a short peak can influence the demand component for a much longer period. The exact effect depends on the network tariff and billing method.
Read demand charges explained before assuming a lower peak will reduce the next invoice immediately. Ratchets, minimums and seasonal rules can change the result.
Network capacity
Peak demand helps networks plan the capacity needed to serve a site and its area. A site with short, intense peaks can require more capacity than its average consumption suggests.
Retail pricing risk
Retailers buy energy and manage the risk that a customer’s actual load differs from forecast. The Australian Government explains that retailers can price load variation risk into the energy component. A volatile or uncertain profile may therefore be treated differently from a steady profile with the same annual kWh.
Contract design
For a larger customer, load shape can influence fixed-price structures, time-band pricing, volume tolerance and the value of demand-response options. This is one reason a C&I tender should use interval data rather than annual consumption alone.
Load factor versus power factor
These terms sound similar but measure different things.
Load factor
Load factor compares average demand with peak demand across time.
It answers: “How steadily does this site use the capacity it reaches?”
Power factor
Power factor compares real power in kW with apparent power in kVA at a point or interval.
It answers: “How effectively is the electrical current being converted into useful work?”
A site can have a low load factor and good power factor, or a high load factor and poor power factor. Review them separately. See the power factor correction guide for the engineering side.
Use interval data to find the cause
A bill may give you the energy total and maximum demand, but interval data shows when the peak occurred and what happened around it.
Review at least:
- date and time of the maximum interval;
- weekday versus weekend profile;
- overnight baseload;
- start-up and shutdown periods;
- seasonal changes;
- public holidays and planned outages;
- solar generation or battery behaviour;
- production volume; and
- equipment or shift changes.
Overlaying operating events is where a useful explanation appears. A 2 pm peak could be HVAC, production, chargers or all three. The data alone cannot identify the equipment.
Ways a site may improve its profile
The right action depends on operations, safety, product quality and tariff rules. Options can include:
- staggering large equipment starts;
- moving discretionary loads away from the site peak;
- sequencing refrigeration, pumps or compressors;
- setting sensible EV-charger limits;
- repairing control faults that make equipment run together;
- reducing unnecessary overnight baseload;
- using thermal or production storage where practical;
- reviewing maximum-demand settings; and
- assessing onsite generation or storage against the actual load shape.
Do not chase a prettier ratio by increasing waste. Reducing the peak can lift load factor. Reducing baseload waste may lower the percentage while still cutting total cost. The commercial objective is a better operating and cost outcome, not the highest possible load factor.
How load factor fits into a C&I tender
For a commercial or industrial procurement process, include load factor as one part of the profile summary.
The tender pack should also show:
- annual and monthly consumption;
- peak demand and time of peak;
- weekday and weekend shapes;
- seasonal variation;
- forecast site or production changes;
- network and metering information; and
- any flexible or curtailable load.
The C&I energy procurement guide explains how that data moves into a comparable retailer request.
A practical review checklist
- Export 12 months of interval data if available.
- Confirm whether billed demand is kW or kVA.
- Calculate monthly average and maximum demand in matching units.
- Plot the load factor by month rather than relying on one annual number.
- Inspect the top demand intervals and overlay operating events.
- Check overnight baseload and non-production days.
- Read the tariff rules before valuing any peak reduction.
- Separate safe operating changes from actions needing electrical design.
- Measure the profile again after any change.
This is a screening process, not an engineering sign-off.
What to do next
If your bill carries demand charges or your business is approaching a C&I tender, get the load profile clear before comparing contracts.
Upload a recent bill and tell us whether interval data is available. We’ll identify the demand basis, explain what the load factor can and cannot tell you, and show whether the contract comparison needs a deeper profile review.
Official sources: Australian Government guidance on retail energy bills, energy management for large users, and demand-side opportunities.