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Understand exactly what’s driving your commercial energy costs – whether it’s a billing error, the wrong network tariff, or something you can fix – before you assume you need a new contract.
High business electricity bills are usually caused by one of a handful of things: demand charges tied to your peak usage, a network tariff that doesn’t match your load profile, rate or contract changes at renewal, estimated rather than actual meter reads, faulty or ageing equipment, or genuine growth in how much power you use. The good news is that most of these are findable.
Book a free consultation, and we’ll help you get to the bottom of your bill.
A high bill usually comes down to a handful of causes – and not all of them are your energy rate.
☑ Demand charges rising with your peak rate of power draw, not your total usage.
☑ A network tariff that doesn’t match how your site actually uses power.
☑ Rate or contract changes that took effect at your last renewal.
☑ Estimated meter reads rather than actual ones, producing catch-up bills.
☑ Faulty or ageing equipment drawing more power than it should.
☑ Genuine load growth – extra sites, new plant, more people.
☑ Network and regulated charge increases passed through to your bill.
The important thing to notice is that several of these have nothing to do with your rate, and can be fixed without changing retailer at all.
To know why a bill is high, you have to know what’s in it.
A commercial electricity bill is made up of several parts.
Two terms are worth knowing. Your NMI is the National Metering Identifier – the unique number identifying your connection point. Your demand charge is billed on peak draw, which is why a short, sharp spike in usage can lift a whole period’s cost even when your total consumption looks normal.
This is where a business bill differs from a household one. For a home, the usage rate is most of the bill. For a commercial site, demand charges and the network tariff can be just as significant – and they’re the parts most businesses never examine.
A sudden spike usually points to a specific, findable cause. If your bill has doubled or come in far higher than the last one, the usual suspects are an estimated meter read followed by a catch-up bill, a demand-charge event where your peak draw was unusually high, a rate or tariff change that took effect at renewal, a seasonal peak, or a new load you have added.
Each of these leaves a trace you can check.
The point is that a jump is diagnosable. Rather than assume the worst or rush to switch, it’s worth working out which cause applies – because the fix is different in each case, and some cost you nothing to correct.
If you’re using the same power but paying more, the cause is usually price structure, not consumption. When consumption has barely moved and the bill still climbs, look at the structure rather than the usage. Rate changes, a tariff reassignment, higher demand charges, a poor power factor, or faulty equipment can all raise the cost of the same amount of energy.
None of that shows up as extra kilowatt hours. These issues hide in plain sight on a large organisation’s bills – spread across multiple sites, and rarely audited line by line. That’s what invoice validation is for: a line-by-line review that surfaces the tariff errors, estimated reads and structural charges most businesses never catch.
Diagnose before you switch. The fix is often in the bill you already have.
A sound approach works in order.
Only once you’ve worked through these does switching retailer become a sensible question rather than a reflex. That sequence matters because a high bill doesn’t always mean you need a new retailer. An advisor with no commission riding on the outcome can tell you that, and point you to the simpler fix when there is one. In practice, that means starting with invoice validation and a network tariff analysis – confirming you’re not overpaying on the bill and connection you already have before anyone talks about a new contract.
For a sense of what’s driving costs across the market this year, our companion piece on why business electricity bills are high in 2026 sets the current context. This page stays focused on diagnosing and fixing your own bill.
We diagnose the whole bill – invoice, tariff, contract and usage – as an independent advisor rather than a broker looking to place a new contract. Because we are transparent about how we’re paid and not incentivised by contract length, our advice is aligned with fixing the actual cause. Our team includes commercially minded electrical engineers, so where the issue is demand, power factor or equipment, it is assessed properly. Our energy analysis and audit is where that whole-bill diagnosis happens.
Selectricity is a signatory to the National Customer Code for Energy Brokers, Consultants and Retailers – the industry standard for transparency and honest representation in how energy consultants and brokers work. It’s a clear signal that our diagnosis is aimed at fixing your bill, not placing a new contract.
For larger sites, demand charges and network tariffs are often the biggest and least understood contributors, alongside the usage rate. A high peak draw, a poorly matched network tariff, or an estimated meter read can each lift a bill considerably, which is why the total is rarely explained by consumption alone.
There’s no single meaningful average, because commercial bills depend on your usage, network tariff, demand profile and location, which vary widely between sites. A small premises and a large industrial operation are not comparable, so a single monthly figure tells you very little about your own site.
Sudden increases often trace to a specific cause: a new or faulty piece of equipment, a change in operating hours, a demand-charge event from an unusual peak, or an estimated meter read catching up to actual usage. Checking metering data and recent changes on site usually identifies which one applies.
For a business, the answer usually lies in the structure of the bill rather than a single rate – demand charges, network tariffs, supply charges and market or environmental components all contribute. The more useful question for a commercial site is which of these is driving your particular bill, which is what a proper review establishes.
Common causes are an estimated meter read followed by a catch-up bill, a demand-charge event where your peak draw was high, a rate or tariff change at renewal, or a seasonal peak. Comparing the two bills line by line, including the meter read type, usually shows what changed.
When consumption is flat but the bill rises, the cause is usually price structure rather than usage – a rate change, a tariff reassignment, higher demand charges, a poor power factor, or faulty equipment. This is exactly the situation an invoice and tariff review is designed to explain.
Yes. When a retailer estimates rather than reads your meter, the estimate can be too high, or a later actual read can produce a catch-up bill that looks like a spike. Checking whether recent bills were based on actual or estimated reads is a standard first step in diagnosing an unexpectedly high bill.
Yes. Ageing or faulty equipment, poorly maintained motors, and a low power factor can all draw more power than necessary or attract additional charges. On commercial sites, this is a genuine and often overlooked cause, and it’s one that an electrical engineering assessment can identify and quantify.
Book a free consultation and we’ll diagnose it with you – starting with the bill you already have.
We are proud to work with Australia’s leading commercial and industrial energy retailers.
