Does Electrical Leakage Really Raise Your Bill — how to check with the meter, and who is responsible
A ground leak is current draining continuously into earth — it genuinely wastes power and genuinely endangers you. This page answers plainly how much it can add to the bill, how to check it yourself with the meter, how grounding differs from an earth-leakage breaker, and — once there is a leak — who has to fix it and pay. No guessed numbers.
Short answer: electrical leakage can genuinely raise the bill, because the current draining to earth is metered as units around the clock — but the risk that matters more than money is electric shock. The safe first check you can do yourself is to switch the main breaker off, unplug every appliance, then watch whether the meter still turns or still counts units — if it does, there is likely a leak somewhere, or a meter problem. On responsibility, the rule is "the utility owns up to and including the meter; everything after the meter into the house is the user's responsibility." Full detail below. (Voltage sag/surge damaging appliances is a separate topic — see the voltage sag/surge page.)
Does electrical leakage really make the bill higher?
Leak wattage → units per month (continuous 24 h leak)
| Example leak / equivalent | Power (W) | Units/month |
|---|---|---|
| Small leak, damp insulation | 25 | ~18 |
| Moderate (old water heater/pump) | 50 | ~36 |
| Large, damaged wire / to-ground | 100 | ~72 |
The unit figures are pure arithmetic from the formula above, not a reading from your home — a real leak may not be steady and usually comes with a shock risk that needs fixing fast, not just a cost concern.
How to check for leakage with the meter (breaker off — does it still turn?)
Turn off every sub-breaker + unplug everything
Trip every sub-breaker down and unplug all appliances (don't forget silent loads — Wi-Fi box, fridge, water filter, water pump) so there is genuinely "no load".
Watch the meter: it should be still
A disc meter must stop spinning; a digital meter's status light (the pulse/kWh symbol) must stop blinking or blink very slowly, and the unit count must not move for 5–10 minutes. If you're unsure where to read the meter, see how to read your meter.
Still counting? Switch circuits back one by one
If the meter still counts with everything off, switch the sub-breakers back one at a time and note which one makes the meter run oddly or trips the earth-leakage breaker. That circuit is the suspect (e.g. the water-heater circuit, the water pump, or an outdoor socket exposed to rain).
Confirm/fix via an electrician or the utility
For a leak inside the house, have a licensed electrician measure it with a clamp/insulation meter and repair it. If you suspect the meter itself (whole house off but the meter still runs), ask the utility to test the meter on 1129 (PEA) / 1130 (MEA) — never open the meter yourself; it is utility property and sealed.
A leak and a high bill — who is responsible?
Where it leaks → who is responsible → what to do
| Where it leaks | Responsible | What to do |
|---|---|---|
| House wiring/sockets/appliances (after the meter) | Owner/user | Licensed electrician to measure & fix |
| Meter / utility service line (up to the meter) | Utility (PEA/MEA) | Call 1129/1130 for inspection |
| Rental/dorm (system owned by landlord) | Landlord (per lease) | Notify landlord at once, keep proof |
How do grounding and an earth-leakage breaker protect you — and how do they differ?
Grounding: metal-bodied appliances (water heater, fridge, washing machine, microwave) should be earthed and use a 3-pin socket. If the internal insulation degrades and leaks to the casing, the earth wire carries it to ground and usually triggers the earth-leakage breaker — which is why MEA stresses "3-pin plugs". Correct earth connection and wire sizing is electrician's work; have a competent person do it to standard.
Earth-leakage breaker (RCD/RCBO/ELCB): ideal for water-prone circuits — water heater, bathroom, outdoor sockets. If it trips often in the rainy season, don't treat it as a nuisance — it is catching a leak for you; trace the cause on that circuit. Let an electrician design the rating and placement to the EIT/utility standard; don't guess the rating yourself.
Leakage is not "voltage sag/surge" — a different problem, a different page
Who wrote this page
Compiled by the CapSolar team, a commercial solar provider in Thailand, and reviewed by Frank Lee (Founder). Safety guidance draws on MEA's electrical-safety library and PEA's SafeSaveThai, whose accessibility we verified as of Aug 2026. Where a specialist current/rating figure would be needed, we do not guess — we point you to a licensed electrician or the utility directly. Leakage is a life-safety issue, not merely a bill.
FAQ
Keep reading
Abnormal Bill Self-Check
Bill jumped though habits didn't — triage causes + priced leak table.
How to Read Your Meter
Read disc/digital/TOU meters before hunting a leak.
Voltage Sag & Surge
Voltage quality & appliance damage — not leakage.
Why Is My Bill So High?
National vs home-only causes of a high bill.
Business electricity so high you want to cut it at the source?
For buildings and factories, solar cuts the bill at its source — CapSolar assesses free of charge, no obligation.