Why Is My Power Bill So High? What an Electrician Actually Checks
A power bill that’s jumped for no obvious reason sends most people straight to “it must be the wiring.” It’s a fair assumption and the wrong starting point. The usual cause is one appliance working harder than it should, or something that changed on the billing side. The electrical installation itself is rarely the culprit.
There is a smaller set of cases where it is a genuine fault, and those usually come with warning signs that go beyond the bill. Here’s how to tell which one you’re looking at, what you can check yourself in ten minutes, and where a licensed electrician actually earns the call.
Start with the one number that sorts it: kilowatt hours
Before anything else, put this bill next to the last one and compare the usage in kilowatt hours (kWh), not the dollar total. That single comparison splits the problem in two.
- Usage is about the same, the total is higher. Nothing in your house changed. The price did. That’s a plan, tariff or billing question for your retailer.
- Usage has gone up. Something is drawing more power than it used to. That’s where the rest of this guide applies.
Rule these out first
A lot of sudden increases have nothing to do with a fault. None of these needs an electrician, and all of them are quicker to check than a call-out:
- A change in your electricity plan or tariff, including a discount period ending
- An estimated meter read catching up with an actual one
- More people home more often
- A run of hot or cold weather pushing the air conditioning harder
- A new appliance that draws more than the one it replaced
- A solar system that has stopped generating, so you’re buying power you used to make. Check the inverter display or app
If the bill doesn’t add up after that, call your retailer and ask them to walk you through it. If usage is up and none of the above explains it, keep reading.
Match the pattern to the cause
| Likely cause | How it usually shows up | Who to call |
|---|---|---|
| Plan change or estimated read | Total up, kWh flat | Your retailer |
| Hot water thermostat or element fault | Sharp jump in kWh from one bill to the next | Electrician |
| Leaking hot tap or relief valve running constantly | Jump in kWh, often with water at the tank or a higher water bill | Plumber |
| Hot water no longer on its economy tariff | Controlled load line shrinks or vanishes, general usage rises | Electrician, then retailer |
| Pool pump, air conditioner or fridge struggling | Gradual creep, sometimes a jump | Electrician or appliance technician |
| Standby and always-on devices | Steadily high, no sudden change | Nobody. Switch off at the wall |
| Loose or degraded connection | Barely visible on the bill. Warmth, smell or discolouration | Electrician, promptly |
The most common real driver: hot water
The Australian Government’s Your Home guide puts a number on it: 23% of the energy used in an average Australian home is used to heat water, and in some homes much more. That makes it one of the largest items on the bill, and the one people look at last because it sits outside and works silently.
When a thermostat sticks or an element starts to fail, an electric storage system can run far longer than it should, sometimes close to continuously. That shows up as a genuine spike in usage and not a gradual creep. If nothing else in the house has changed, hot water is the first thing to check.
Who you call depends on which half has failed. The thermostat, the element and the wiring to the unit are electrical, and that’s a hot water electrical check. A hot tap that drips, or a relief valve that never stops discharging, is plumbing: the tank is reheating water that is leaving the system. The same guide notes that about 30% of the energy used to heat water in a storage system is lost from the tank and pipework, so a storage unit is always topping itself up, and a leak makes it do that all day. Our guide to electric hot water faults covers the electrical causes in detail.
The hot water tariff almost nobody checks
Most electric storage systems in South East Queensland are meant to run on an economy tariff, where the network controls when power flows in exchange for cheaper energy. Energex lists two: Tariff 31, supplied for 8 or more hours a day, around 10pm to 7am, and Tariff 33, supplied for 16 or more hours, usually outside 4pm to 9pm.
If the system ends up connected to the general supply after a hot water replacement, a meter change or switchboard work, the tank works perfectly and the same hot water simply costs more. The bill is the only symptom. Look for a separate controlled load line on your bill. If it used to be there and has shrunk or gone, that’s worth a call.
Energex’s instruction is to contact a licensed electrician to connect an appliance to an economy tariff, so this is electrical work and not something the retailer fixes from their end. We cover how it goes wrong in does replacing a hot water system need an electrician.
Standby power and “always on” devices
The federal energy department is plain about it: many appliances continue to use energy even when switched off on the machine, because they’re in standby power mode. Its advice is that, other than fridges, freezers and critical medical equipment, it’s worth switching most appliances off at the wall.
You’ll see percentages quoted for standby all over the internet. We haven’t found one in a current Australian Government source, so we won’t repeat one here. What matters for diagnosis is the pattern. Standby is a steady background cost that barely moves from month to month, which makes it a common reason a bill sits higher than expected and a poor explanation for one that jumped.
When it’s actually a fault, not just usage
A handful of genuine issues can drive a real increase:
- A pool pump or air conditioning compressor starting to fail, drawing more current or running longer to do the same job. Pools add their own considerations, covered in spa and pool pump electrical requirements.
- A degraded fridge or freezer seal, forcing the compressor to run far more than it should. The same government page puts fridges and freezers at around 10% of household energy bills when they’re working properly, so one that never cycles off is noticeable.
- A degraded or loose connection somewhere in a circuit, which wastes a little energy as heat at the fault point.
That last one is the important distinction. A loose connection or a failing point in the switchboard isn’t usually the reason for a dramatic bill jump. It is a fire risk that happens to show up faintly on a bill too, which is why the warning signs below matter more than the dollar figure.
Warning signs that mean stop and call now
Get this checked immediately, not on your next convenient weekend
- A switch, power point or the switchboard itself feels warm to touch
- A circuit breaker feels warm or looks discoloured
- Any burning smell, even faint, with no obvious kitchen or outdoor source
- A safety switch that trips specifically when one appliance runs
- Visible scorch marks or melted plastic anywhere near a power point or the switchboard
- Buzzing or humming from the switchboard
None of these are billing symptoms first. They are safety symptoms that affect the bill as a side effect, and they deserve the priority that implies. If you’re unsure whether it can wait, what counts as an electrical emergency sets out where the line is.
How a fault check actually finds it
- The switchboard first. Loose terminals, signs of heat damage, and whether the safety switches operate as they should.
- Then the leading suspect. Whichever appliance or circuit fits what you’ve noticed, usually hot water, then pool and air conditioning circuits.
- Thermal imaging where it helps. A thermal scan shows heat building at a bad connection well before it is hot enough to smell, touch or trip anything.
- A straight answer. Including when the cause isn’t electrical and the next call belongs to your retailer or a plumber.
We don’t publish a figure for a fault-finding visit, because what it involves depends on what’s found: how many circuits need testing, whether the cause is at the board or at an appliance, how easy the access is, and whether a thermal imaging scan is needed. The price is fixed on site, before any work starts, once we know what we’re looking at.
On the Gold Coast, specifically
Three local factors push bills here. Humid summers mean air conditioning carries a heavy share of the load for months at a stretch, so a tired compressor costs more here than it would further south. Pools are common, and a pump that runs longer than it needs to is easy to miss. And salt air is hard on connections, which is why Gold Coast switchboards corrode faster than inland ones.
In established homes around Palm Beach and Robina, the bill question often turns out to be an age question. If your place is a few decades old, common electrical problems in older QLD homes sorts what’s a fault from what’s simply old.
Frequently asked questions
Can faulty wiring cause a high power bill?
It can, but it is uncommon as the main cause. A loose or degraded connection wastes a little energy as heat, which is rarely enough to explain a large jump on its own. It is a fire risk, though, so warm switches, a warm breaker or a burning smell should be checked whatever the bill says.
Why did my power bill suddenly double?
Compare the kilowatt hours on this bill with the last one. If usage is flat, the change is on the pricing side and your retailer can explain it. If usage has jumped, hot water is the usual suspect, since it accounts for 23% of the energy used in an average Australian home, followed by a pool pump, air conditioner or fridge working harder than normal.
How much does standby power actually cost on a power bill?
There is no single reliable figure, because it depends on what you own and how old it is. The Australian Government’s energy.gov.au confirms many appliances keep using energy in standby mode and suggests switching most off at the wall, other than fridges, freezers and critical medical equipment. Standby is a steady background cost, so it rarely explains a sudden spike.
My circuit breaker feels warm, is that related to my high bill?
A warm breaker is a safety issue first and a billing issue second. It can point to a loose connection or a circuit carrying more load than it is rated for. Neither adds much to a bill, but both get worse over time, so have it checked promptly by a licensed electrician.
Can a licensed electrician tell me exactly what’s driving my high power bill?
An electrician can find electrical causes, such as a failing hot water element or thermostat, a hot water system connected to the wrong tariff, or a connection running hot, using fault-finding and thermal imaging. If the cause is a plan change, an estimated meter read or general usage, that is a conversation for your electricity retailer.
What does a thermal imaging scan actually find?
It shows heat building at electrical connections, in the switchboard and on appliance circuits before it can be felt or smelt. It is a non-invasive way to catch a developing fault, such as a loose terminal, early. It finds heat, so it works alongside electrical testing and does not replace it.
Not sure if it’s usage, a fault, or both? Call us for a straight answer, or request a free quote.