Why does half my house have power and half doesn't?

Your home is fed by two 120-volt legs. If one leg is lost — at the utility service, the meter, the main breaker, or a main connection — every circuit on that leg goes dark while the other leg keeps working, leaving roughly half the house dead. A utility outage, by contrast, would cut everything.

Is losing half my power dangerous?

It can be. A lost leg is sometimes paired with a loose or open neutral, which can push abnormal voltage to some circuits and damage electronics or cause overheating. If you see lights brightening and dimming, smell burning, or feel a warm panel, treat it as urgent: call 911 and your utility, and do not touch the panel.

Will resetting the main breaker fix it?

Sometimes. A double main breaker can trip on one side and drop a leg, so switching it fully off and back on may restore both legs. If it does not, or if it trips again, the cause is likely a loose lug, a failing breaker, or a utility-side problem, and you should stop and call a professional.

Is this a utility problem or mine?

Check the meter (by sight only). If the meter is dark or damaged, or there is visible damage on the service line, the lost leg is likely on the utility's side — call them. If the meter has power but half the house is still dead, the fault is inside your equipment (panel, main breaker, or lugs) and an electrician should handle it.

What is a lost neutral and why does it matter?

The neutral is the return path that keeps voltage balanced between your two legs. If it becomes loose or breaks, voltage can swing too high on some circuits and too low on others, which can destroy electronics and create a fire risk. Suspected lost neutral is an urgent issue — unplug sensitive devices and get a licensed electrician promptly.

Half My House Has No Power — Causes and What to Check

When half your house loses power but the other half keeps working, you are seeing a classic symptom of a lost 120-volt 'leg.' Homes in the U.S. are fed by two hot legs that combine to power the whole panel; lose one and roughly half your circuits go dark while the rest stay on. This is not a utility-wide outage — a public outage takes out everything. The cause is usually at the main breaker, the main lugs, or the utility service connection, and a few of these are urgent. Here is how to check safely.

Quick check: is the problem inside your home?

Answer a few questions to narrow it down. The more of these that apply, the more likely the issue is on your side of the meter.

Do your neighbors still have power?
Is only part of your home affected?
Does a breaker keep tripping repeatedly?
Are your lights flickering or dimming?
Did it start right after using an appliance?
Any burning smell, sparks, or smoke?

Safety first — this can be urgent

A lost leg sometimes comes with a loose or open neutral, which can send dangerous voltage to some circuits. Call 911 and your utility immediately, and do not touch the panel, if you notice: lights brightening and dimming oddly, a burning smell, smoke, sparks, buzzing, a warm panel, or appliances behaving erratically. These can damage electronics and start fires.

Why half the house goes dark

Your panel receives two 120-volt hot legs (often called L1 and L2) from the utility. Standard outlets and lights use one leg or the other; large appliances use both. If one leg is lost — at the utility's service drop, the meter, the main breaker, or a main lug connection — every circuit on that leg goes dead, which is typically about half the home. The circuits on the surviving leg keep working, which is why it looks like 'half the house.'

What you can safely check

- Reset the main breaker once: switch it fully off, then on. A half-tripped double main can drop one leg.

- Scan branch breakers for any tripped ones and reset them; a cluster on one side may simply be tripped.

- Note whether the dead circuits all sit on one side or interleave with working ones — a clean split strongly suggests a lost leg.

- Look (do not touch) at the meter: if it is dark or damaged, the issue is likely the service side — call the utility.

Who fixes it

Call your utility if the meter is dark or damaged, or there is visible damage on the overhead/underground service line — losing a leg on the utility's side is their responsibility up to the meter.

Call a licensed electrician if the meter is fine but half the house is still dead, if the main breaker won't restore both legs, or if you see flickering, dimming, or warm equipment. A loose main lug or a failing main breaker is inside your equipment and needs professional repair. Do not delay if a lost neutral is suspected — it can damage everything plugged in.

Frequently asked questions

Why does half my house have power and half doesn't?: Your home is fed by two 120-volt legs. If one leg is lost — at the utility service, the meter, the main breaker, or a main connection — every circuit on that leg goes dark while the other leg keeps working, leaving roughly half the house dead. A utility outage, by contrast, would cut everything.
Is losing half my power dangerous?: It can be. A lost leg is sometimes paired with a loose or open neutral, which can push abnormal voltage to some circuits and damage electronics or cause overheating. If you see lights brightening and dimming, smell burning, or feel a warm panel, treat it as urgent: call 911 and your utility, and do not touch the panel.
Will resetting the main breaker fix it?: Sometimes. A double main breaker can trip on one side and drop a leg, so switching it fully off and back on may restore both legs. If it does not, or if it trips again, the cause is likely a loose lug, a failing breaker, or a utility-side problem, and you should stop and call a professional.
Is this a utility problem or mine?: Check the meter (by sight only). If the meter is dark or damaged, or there is visible damage on the service line, the lost leg is likely on the utility's side — call them. If the meter has power but half the house is still dead, the fault is inside your equipment (panel, main breaker, or lugs) and an electrician should handle it.
What is a lost neutral and why does it matter?: The neutral is the return path that keeps voltage balanced between your two legs. If it becomes loose or breaks, voltage can swing too high on some circuits and too low on others, which can destroy electronics and create a fire risk. Suspected lost neutral is an urgent issue — unplug sensitive devices and get a licensed electrician promptly.