Homeowner symptom guide · Melbourne
High Electricity Bill in Melbourne: Finding the Cause
An unexpectedly high electricity bill in a Melbourne home usually has an identifiable cause — and finding it can save hundreds of dollars annually. While energy prices have increased across Victoria, a bill significantly above your historical average (adjusted for season) typically reflects a change in consumption or generation that can be tracked down.
Take the free home risk check →Common Causes
- • HVAC inefficiency: dirty filters, aging compressors, and refrigerant leaks all reduce system efficiency — making your air conditioner or heat pump work harder and longer to achieve the same result, significantly increasing running costs.
- • Hot water system element failure: a failing element in an electric storage hot water system can get stuck 'on', drawing continuous full power instead of cycling. A single failing element can add $30–$80 per month to electricity costs.
- • Solar system underperformance or failure: a solar system that has stopped generating — due to an inverter fault, disconnected isolator, or new shading — converts what was previously self-generated energy into grid import, often a $100–$300 per quarter change.
- • Pool pump running time: pool pumps are often one of the largest electricity consumers in a Melbourne home. Incorrect timer settings or a failing pump running continuously can dramatically increase bills.
- • EV charging: electric vehicle charging (particularly Level 2 home charging) typically adds $50–$200 per month to electricity consumption depending on driving habits.
- • Standby loads from new appliances: newer appliances — smart TVs, game consoles, second refrigerators — add cumulative standby load that builds up as households acquire more devices.
When to Be Concerned
- Bill is more than 30% higher than the same quarter last year with similar household composition
- Solar generation has noticeably dropped (check inverter display or monitoring app)
- HVAC system is running much more frequently than in previous seasons
- Hot water system is very old or showing other signs of problems
What to Do
- 1 Review your smart meter data via your energy retailer's app — look for unusual consumption patterns (e.g., consistent overnight load when the house is unoccupied, or consumption that didn't change when solar was generating).
- 2 Check your solar inverter for fault codes or reduced generation during good weather.
- 3 Check your hot water system — if it's running continuously or showing error indicators, call a plumber.
- 4 Consider a home energy audit ($200–$500) from a licensed energy auditor if the cause is not obvious — auditors can identify specific consumption sources with measurement tools.
Frequently Asked Questions
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How can I tell if my solar system is still working?
Check the inverter display during peak sun hours — it should show active generation in kilowatts. Compare generation data from your monitoring app against the same period in the previous year. A significant drop (more than 20%) warrants investigation.
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Does a pool pump use a lot of electricity?
A typical single-speed pool pump uses 1–3 kW — running 8 hours a day adds $300–$800 per year at Melbourne electricity rates. Variable-speed pool pumps use 50–80% less energy and typically pay for themselves within 2–3 years.
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