Partial Power Outage at Home: What You Should Do Now

Half the house has power and half does not. What is going on? A partial outage usually means one of three things: a tripped safety switch covering part of your board, a lost phase or failed connection where the supply enters the house, or a broken neutral. The first you can safely reset yourself. The other two need your distributor or a Level 2 electrician, and the broken neutral in particular should not wait.

⚡ Quick Answers: partial power outages

• Why do some circuits work and others not? Your board splits the home into circuits, and on three phase homes into phases. A fault upstream of one group kills that group and leaves the rest running.
• Is it safe to reset the switches? Once. Push a tripped breaker or safety switch fully off, then on. If it trips again, stop; something is telling you it has a fault.
• When is a partial outage dangerous? When lights brighten in one room while dimming in another, when you feel tingles from taps or appliances, or when anything smells hot. Those are broken neutral signs.
• Who do I call? Neighbours dark too: your distributor (Ausgrid 13 13 88, Endeavour Energy 131 003). Just your place: a Level 2 electrician. Fire or shock: 000 first.
• What if nothing has tripped at all? Treat it as an upstream fault at the meter, service fuse or connection. Repeated resetting will not help; that is Level 2 territory.

1. Check the switchboard first

Open the board and look for anything sitting off or in a halfway position. One safety switch often protects several circuits, so a single trip can kill what looks like half the house. Unplug sensitive electronics on the dead circuits, push the tripped device fully off and then back on, once. If it holds, plug appliances back in one at a time to find the culprit; if it trips again immediately, leave it off and call. If a switch keeps tripping, our guide to a safety switch that keeps tripping explains what is going on.

2. How a partial outage happens in an Australian home

Most Sydney homes have single phase supply, where one active conductor and one neutral feed the whole board; larger and newer homes often have three phase. On a three phase home, losing one phase kills the slice of the board on that phase while the rest keeps working, which is why the oven can be dead while the lights shine on. On a single phase home, a failing connection at the service fuse, meter or consumer mains can drop some circuits, behave intermittently, or take everything out at once. Our plain-English guide to the point of attachment and service fuse shows where those upstream parts live.

3. The broken neutral warning signs

The most dangerous cause of strange partial power is a broken or failing neutral. Instead of circuits simply going dead, the voltage across the house goes out of balance: lights brighten in one room and dim in another, electronics behave erratically or die in clusters, and metal taps or appliances can give a tingle. If you see that pattern, stop resetting things, switch off the main switch, call your distributor's faults line and then a Level 2 electrician. Our guide to broken neutral faults explains why this fault energises things that should never be live.

4. Work out whose side the fault is on

Check the neighbours before you book anyone. If nearby homes are dark or half-dark too, the fault is on the network side; report it to Ausgrid on 13 13 88 or Endeavour Energy on 131 003, and they attend their own faults at no charge. If the street is fine and only your home is affected, the fault is on your side and a Level 2 electrician is the right call. Not sure which network covers you? You can check your network area in seconds with our postcode checker, and our list of emergency contact numbers is worth saving now rather than during the outage.

5. What the electrician does on site

The diagnosis is methodical: voltage measured at the mains under load to confirm whether the fault is upstream or internal, the board inspected for heat, corrosion and loose terminations, circuits tested individually, and thermal imaging used to find failing joints before they show visible damage. Repairs range from re-terminating a loose connection to replacing a failed main switch, meter connection or a run of consumer mains, and work at the meter or service side is coordinated with your distributor. Everything ends with a Certificate of Compliance for Electrical Work. The full sequence is covered in our electrical fault finding guide, and if you want the broader emergency playbook, the power outage response checklist walks through it.

6. Getting power back on safely

When supply returns, restart heavy appliances one at a time rather than all at once, and watch for repeat trips in the first half hour. If you are running a generator in the meantime, never plug it into a power point: backfeeding can kill the crews restoring your street, and the only legal connection is through a proper inlet and changeover switch. Our new guide to making a home blackout ready covers the legal backup options. Solar inverters shut themselves down during grid faults by design and restart once supply is stable, so leave the inverter alone rather than forcing it.

Why it's Level 2 ASP work

The meter, service fuse, consumer mains and connection point sit past the limit of a standard electrician's licence. If your partial outage traces upstream of the switchboard, only a Level 2 ASP can repair it and coordinate the disconnection and reconnection with your network, which is the difference between one visit and two. Our guide to the standard electrician versus Level 2 ASP difference maps exactly where that line sits.

How High Demand Electrical helps

We attend partial outages across Sydney 24/7 with crews accredited for the full scope: emergency make safe, switchboard diagnosis and repair, meter and service work, consumer mains replacement and direct coordination with Ausgrid and Endeavour Energy. You get a written price after the assessment and a compliance certificate on completion, and when the fault turns out to be on the network side, we tell you so you are not paying for work the distributor does free.

Partial power outage FAQs (Sydney)

Why do my lights work but the power points don't?

Lighting and power circuits are separate at the board, and one safety switch often covers several power circuits. A tripped device or a faulty appliance on that group is the usual cause; reset once and unplug appliances to test.

Does the distributor charge to fix a fault?

Not for faults on their own network. Anything on your side of the connection point, including the consumer mains and your switchboard, is private work for an electrician.

How fast can power be restored?

Simple faults are often fixed on the first visit. Where mains or metering must be replaced, timing depends on scope and distributor coordination; our guide to same day reconnection covers what is realistic.

Should I document the outage for insurance?

Yes. Note when it started, photograph any visible damage, and keep receipts for spoiled food or damaged equipment, then check what your policy covers.

Half the house dark and resets not helping? Call for an emergency response on 0402 559 777, 24 hours a day. Every job starts with a site assessment so scope and pricing are confirmed before work begins.