Why Did Half My House Lose Power?

You went to flip on the kitchen light and nothing happened. But walk into the living room — the TV works fine. The microwave is completely dead, but the refrigerator is humming along. Half your house has power. The other half is dark. And when you go look at the breaker panel, everything looks completely normal.

It’s disorienting. Your first question is probably “is this dangerous?” Your second is “how much is this going to cost me?”

We’re going to answer both of those honestly — without the scare tactics and without steering you toward repairs you don’t need. The truth is, losing power to half your house is more common than most people realize, it almost always has a clear cause, and in many cases the fix is simpler than you’d expect.

By the end of this, you’ll know exactly what’s happening, what you can safely check yourself, and when it’s time to pick up the phone.

Why Would HALF the House Lose Power? (The 2-Minute Explanation)

This is the part that confuses most homeowners — and it makes total sense that it would. If the power goes out, shouldn’t it be all out?

Here’s what’s actually happening. Your home receives electricity through what’s called a split-phase service. Two separate 120-volt “legs” of power come into your home from the utility transformer on the street. Most of your everyday circuits — lights, outlets, smaller appliances — run on just one of those two legs. Your big 240-volt appliances (AC, dryer, water heater, electric range) use both legs at once.

The “halves” don’t always divide neatly by room, either. You might have power in one outlet in the kitchen but not another, because different circuits in the same room can be on different legs. What matters is which leg each circuit is connected to inside your panel.

When one of those legs gets interrupted — whether at the utility, the meter, the main breaker, or inside the panel itself — everything on that leg stops. Now let’s walk through exactly why that happens.

The 5 Most Common Causes — Ranked by How Often We See Them

1. A Double-Pole Breaker Tripped (Most Common — Check This First)

Your HVAC, dryer, water heater, and electric range all run on 240 volts, which means they use a double-pole breaker — a breaker that takes up two slots in your panel and connects to both legs of power. When one of these trips, it can knock out power to one entire leg’s worth of circuits throughout the house.

Here’s the frustrating part: a tripped double-pole breaker doesn’t always look tripped. The handle might sit in a middle position, or it may look identical to every other breaker in the panel. You can walk right past it thinking everything looks normal.

Start here before anything else. It takes two minutes and costs nothing. If this is the culprit, you’re done.

2. Oncor Lost a Leg on Their Side (Not Your Problem to Fix)

If the issue isn’t in your panel, the next most likely cause is on Oncor’s side of the meter. The utility lines in your neighborhood carry power in phases, and individual fused cutouts on the distribution lines protect the grid from lightning strikes, surges, and tree limbs. A single fuse blowing at the transformer — or one wire in the service drop getting damaged by a falling branch — can kill exactly one leg of power to your home.

When this happens, your neighbors might have full power, partial power, or none at all depending on which circuits in the neighborhood share the same phase. It can look very confusing from the outside.

In DFW, Oncor’s distribution lines take a beating from our weather — summer heat that warps connections, thunderstorms that bring down limbs, and occasional ice events that add dead weight to service lines. Oncor handles over 1.1 million outage events per year across the region, and a significant portion of those are single-phase interruptions exactly like this one. As of 2025, Oncor is mid-way through a $36.1 billion infrastructure investment to harden the grid — but in the meantime, utility-side failures remain a real and regular cause of partial home outages.

3. Loose or Corroded Connection at the Meter Base or Service Entrance

If Oncor’s lines are fine and the breakers look normal, the problem may be at the connection point between the utility and your panel — specifically at the meter base or the service entrance conductors.

The meter base is the enclosure that houses your electric meter. Inside it are spring-loaded “jaws” that hold the meter’s contact points. Over time — especially in DFW, where we get brutal heat cycles in summer and rapid temperature drops in winter — these metal connections expand and contract, loosen, and corrode. When one connection goes bad, it breaks continuity on one leg. Power to half the house stops.

North Texas heat is genuinely hard on electrical connections. Sustained triple-digit temperatures cause different metals inside your meter base and service entrance to expand at different rates. Over 10 to 20 years, this “thermal creeping” gradually loosens lug connections — and then one August afternoon at peak load, a connection that’s been getting worse for years finally fails. This is one of the most common service calls we see during DFW summer heat waves.

This is not a DIY repair. Meter base work requires a licensed electrician, and in most DFW cities it also requires a permit and inspection before Oncor will re-energize your service. If you have buzzing sounds near the meter, visible scorching, or a burning smell — stop using power to that side of the house and call immediately.

4. The Main Breaker Is Failing on One Pole

Your main breaker is a double-pole device — it’s designed to disconnect both legs of power simultaneously when it trips or when you shut it off manually. But like any mechanical device, it can wear out. Over years of use, the internal contact mechanism on one pole can degrade, corrode, or get damaged from electrical arcing.

When a single pole of the main breaker fails, that leg of power stops flowing into your panel — even though the breaker handle looks completely normal and the other leg keeps working. Resetting the main breaker won’t fix this, because the internal contact is already compromised.

If you’ve already ruled out the utility and reset the breakers with no luck, a failing main breaker is a strong suspect. A licensed electrician can confirm this in minutes with a multimeter reading at the main lugs.

5. A Dangerous Panel — FPE Stab-Lok or Zinsco/Sylvania

A significant number of DFW homes built between the 1950s and early 1980s still have electrical panels that are now known to be genuinely hazardous. If your home is in this age range, this cause deserves serious attention.

Federal Pacific Electric (FPE) Stab-Lok panels were widely installed across DFW suburbs during the post-war building boom. Forensic studies have shown that these breakers frequently fail to trip during overload or short-circuit conditions. In a partial power loss scenario, an FPE panel may have experienced internal arcing where the breaker connects to the bus bar — melting the connection and permanently cutting power to one leg while simultaneously creating a fire hazard.

Zinsco and Sylvania panels have a similar problem. Their aluminum bus bars are prone to oxidation and corrosion, which causes poor contact between the breaker and the bus bar, excessive heat, and eventual failure. Homeowners often report hearing crackling or buzzing from these panels before a partial power failure occurs — that’s active arcing happening inside the enclosure.

The Scenario That’s a True Emergency: Open or Lost Neutral

Everything above describes the loss of one hot leg — which is a problem, but manageable. There’s a different failure that’s far more dangerous: an open neutral.

In a healthy electrical system, the neutral conductor carries current back to the transformer and keeps your two 120-volt legs balanced. When the neutral connection fails or becomes loose, that balancing point disappears. The two legs effectively become connected in series, and the voltage stops dividing evenly.

What happens next is destructive and potentially deadly. Circuits with lighter loads can suddenly receive far more than 120 volts — in some cases pushing toward 200 volts or higher. Sensitive electronics get destroyed. Appliances overheat. And because current seeks a path back to ground, it may find one through your metal plumbing, appliance housings, or anyone who touches them.

An open neutral can occur at the utility connection, at the weatherhead, or at the neutral bus bar inside your panel. In any case, it requires professional diagnosis and repair — not a reset, not a wait-and-see.

What You Can Safely Check Yourself (Before Calling Anyone)

Before you spend money on a service call, there are a few things you can do safely on your own. These steps won’t put you at risk and may resolve the problem entirely.

If you’ve worked through that checklist and still don’t have power — or if anything looks burned, smells wrong, or sounds wrong — it’s time to call a licensed electrician.

When to Call an Electrician — and How Fast

Not every partial outage needs the same urgency. Here’s how to read the situation:

Call the same day if the outage persists after checking breakers and calling Oncor, if you’ve identified a meter base or service entrance issue, or if your main breaker appears to be failing. These are repairs that need a professional but don’t require you to evacuate.

Call immediately and turn off your main breaker now if you notice burning smells, buzzing or crackling sounds from the panel or meter, scorched breakers, lights behaving strangely (unusually bright or dim), or any signs of an open neutral as described above. These are fire and shock hazards that aren’t a wait-until-tomorrow situation.

Don’t wait at all if you have an FPE Stab-Lok or Zinsco panel and are experiencing any partial power loss. The mechanism causing the outage may also be creating conditions for a fire inside the panel itself.

In most DFW cities — including Fort Worth, Arlington, and North Richland Hills — repairs to the main breaker or meter base require a permit and a city inspection before Oncor will re-energize your service. A licensed electrician handles this process for you and coordinates directly with Oncor. If you try to repair this yourself without a permit, you risk being stuck without power until the city can schedule an inspection — which can take days. Learn more about what electrical work requires a permit in Texas.

What Does This Repair Actually Cost in DFW?

One of the first things people worry about when this happens is the bill. Here are honest, current numbers for the DFW market so you know what to expect.

Note: most DFW electricians charge a diagnostic fee of $89–$150 for a service call, which is typically applied toward the cost of the repair.

If an electrician shows up, spends five minutes looking at your panel, and tells you that you need a full panel replacement without a thorough diagnosis — get a second opinion. A good electrician will explain exactly what they found, show you the problem, and give you options. That’s what we do on every call. Use our panel upgrade calculator if you want a ballpark before anyone arrives.

A Real Example From Our Service Calls

A homeowner called us after their AC stopped working in the middle of a Fort Worth summer. Another electrician had already been out and told them they needed a full panel replacement — a $3,500+ job — before anything else could be fixed.

We came out, did a proper diagnosis, and found the real issue: a single breaker with a burnt connection at the bus bar. We replaced the breaker, fixed a couple of minor issues we noticed while we were in the panel, and the AC was running again the same day. Total cost: a fraction of what they’d been quoted.

We’re not saying every partial outage is that simple. Sometimes a panel does need to be replaced — especially if it’s an FPE or Zinsco, or if the equipment has reached the end of its service life. But the diagnosis has to come first. Know the signs of real electrical problems so you can ask the right questions.

Frequently Asked Questions

You Don’t Have to Figure This Out Alone

Losing power to half your house is stressful — especially when you can’t tell from looking at the panel what went wrong. But there’s almost always a clear answer, and in most cases the repair is far more straightforward than you’re imagining right now.

We’ve been diagnosing these exact problems in Fort Worth, Arlington, Keller, and all across DFW for years. We’ll tell you exactly what we find, explain the repair clearly, and give you real options — not pressure. If it turns out to be something simple, we’ll tell you that too.

Call or Text: (682) 478-6088

Serving Fort Worth, Arlington, Keller, Southlake, Colleyville, Grapevine, Lewisville, North Richland Hills, and all of DFW