Emergency Generator Repair Houston: 24/7 Help When Your Generator Fails

It’s the worst timing possible. The power goes out, the generator starts, runs for an hour and then shuts down. Or it never starts at all, and the house is already warming up toward 90 degrees. When that happens you don’t need a buyer’s guide; you need emergency generator repair in Houston, a number to call, and a plan for the hours until a technician arrives.

The Repairior editorial team put together the 19 Houston-area companies in our directory that offer emergency generator service, most of them listed as open 24 hours. Below you’ll find who to call by part of town, what to check yourself in the first ten minutes, what emergency service costs, and how to stay safe and cool if the fix takes longer than you hoped.

19 Emergency Generator Repair Companies in Houston, TX

The first group are generator specialists who handle urgent breakdowns. Next come licensed electricians who respond 24 hours to generator, transfer switch and hookup problems. The last three serve businesses and industrial sites and supply rental or replacement generators fast.

See every emergency generator repair company in Houston, TX →

Who to Call by Part of Houston

Area	Generator specialists	Electricians / other
Inner Houston, Bellaire, Pasadena	Barnes and Sons Generation (mobile, 24/7), Install This Week Company	–
Northwest Houston, Cypress, Tomball	Generators TX LLC	JN’L Electric, Wired Electrical and Generators
North Houston, Spring, Humble	–	Green Star Electric, Spring Electric and A/C, Raw Electrical Services
West Houston, Katy, Richmond, Sugar Land	Critical Power Solutions, Certified Generator Service and Repair, GenService, Gallegos Generator, Select Generators	–
East Houston	Doctor Home Experts Houston Generator	GenSolutions (commercial, generators fast)
South Houston, Pearland, Rosharon	Generator Boyz	–
Bay Area, Clear Lake, League City	–	Kemah Emergency Generator (rentals with delivery)
Across Houston, mobile	Texas Best Generator Services	–
Commercial and industrial	Mckain Power Systems (Katy)	GenSolutions, Kemah Emergency Generator

What to Do in the First 10 Minutes

These steps are safe for a homeowner and, surprisingly often, get the power back without a service call. Stop if anything smells like gas or burning.

1. Read the controller. Open the enclosure lid and photograph the screen or status light. Note any alarm word or code. Check the app if your unit has Wi-Fi monitoring.
2. Check the mode. The controller must be in AUTO. A unit left in OFF after maintenance is a classic surprise.
3. Check breakers. The generator’s own main breaker (inside the enclosure) and the generator breaker in your panel.
4. Check gas. If the stove or water heater also has no gas, the problem is gas supply. Call CenterPoint Energy. If you smell gas, leave the area and call from a safe distance.
5. Check oil with the engine off. A low oil shutdown is common on units that ran for days.
6. Clear an alarm only once. If it trips again, stop and call a technician. Repeated restarts can turn a small fault into a large one.

When it runs, but the house is dark

If the generator is running but nothing in the house has power, the problem is usually the transfer switch or a breaker, not the generator. Tell the dispatcher that. Install This Week Company, for one, specifically writes about automatic transfer switch relay failures, and the electricians on this list, including Spring Electric and A/C and Green Star Electric, work on transfer switches.

Most Common Emergency Generator Failures in Houston

Symptom	Likely cause
Won’t crank at all	Dead battery (most common), bad battery charger, controller fault
Cranks but won’t start	Gas supply or regulator, ignition, spark plugs
Starts, then shuts down under load	Overload from AC units, low oil, overheating, fuel pressure drop
Shuts down after many hours	Low oil after long runtime, overheating from blocked airflow
Runs, no power to house	Transfer switch, relay, tripped breaker
Lights flicker, voltage swings	Governor or stepper motor, fuel issue, alternator

Two patterns stand out in Houston. Batteries fail far more often here than in mild climates, because summer heat shortens their life. And during multi-day outages such as the May 2024 derecho and Hurricane Beryl, many units hit their oil change interval mid-outage and shut down on low oil. Several customers of Generators TX LLC and Texas Best Generator Services specifically mention fast emergency repairs after Beryl.

How Much Does Emergency Generator Repair Cost?

Item	Typical cost
After-hours or weekend service call	$150–$400
Standard weekday diagnosis	$125–$250
Battery replacement	$150–$350
Oil change during an outage	$150–$300
Ignition, starter or sensor repairs	$250–$900
Transfer switch repair	$300–$1,200
Controller replacement	$700–$1,500
Residential rental generator (per day)	$75–$250+, plus delivery

These ranges are typical estimates, not quotes. During a named storm, demand outruns supply, so expect higher after-hours rates and longer waits. Customers on a maintenance plan are often scheduled first, which is one of the best reasons to have one. See our generator maintenance Houston guide.

Staying Safe While You Wait

• Carbon monoxide: run any portable generator outdoors, at least 20 feet from the house, exhaust facing away. Never in a garage. Put battery CO alarms on every level.
• No backfeeding: don’t connect a portable generator to a wall outlet. It can kill a line worker. Use cords or an installed interlock.
• Heat: Houston outages in July and August are a health risk, especially for older adults and anyone on medical equipment. ReadyHarris and the City of Houston publish cooling center locations during major outages.
• Food and medication: keep fridge and freezer doors closed. Plan for refrigerated medicine.
• Report the outage to CenterPoint Energy so restoration is tracked.

Emergency Generator Service for Businesses

For restaurants, clinics, warehouses and plants, every hour without power has a cost. Mckain Power Systems runs its own fleet of service trucks for diesel generators and engines and is listed as open 24 hours. GenSolutions in east Houston supplies generators quickly, with delivery and curbside pickup, and Kemah Emergency Generator rents units (customers mention a 25 kW rental) with delivery to the Bay Area. If your building has a life-safety generator, keep the service company’s emergency contact posted at the unit and confirm it holds your service records.

How to Avoid the Next Emergency Call

1. Book annual maintenance in spring, before June 1.
2. Replace the battery every 3–5 years, before it fails.
3. Keep the controller in AUTO and check the weekly exercise.
4. Change the oil after any outage longer than a day or two.
5. Save two emergency numbers now, in case your first choice is overwhelmed during a storm.

How to Get Emergency Generator Repair Quotes in Houston

1. Note the generator brand, size and the exact alarm or symptom.
2. Take photos of the controller, nameplate and transfer switch.
3. Call a 24-hour company directly if the house is without power now.
4. For less urgent problems, send one request through Repairior’s free quote form to reach several companies at once.
5. Ask about the after-hours fee and arrival window before you confirm.

Emergency Generator Repair Houston: Frequently Asked Questions

Who offers 24-hour generator repair in Houston?

Barnes and Sons Generation lists 24/7 availability, and Generators TX LLC, Critical Power Solutions, Certified Generator Service and Repair, GenService, Texas Best Generator Services, Install This Week Company, Gallegos Generator, Select Generators and several electricians on this list are listed as open 24 hours.

How much does emergency generator repair cost?

Expect an after-hours or storm-week service call of about $150–$400, plus parts. Batteries cost about $150–$350, and transfer switch or controller repairs can run $300–$1,500.

Why did my generator shut off during a power outage?

The most common causes are low oil after long runtime, overload from air conditioning, overheating from blocked airflow, a gas pressure drop or a sensor fault. Check the controller alarm and the oil level first.

What should I do if my generator won’t start during an outage?

Make sure it’s in AUTO, check both breakers, confirm gas service and check the battery and oil. If it still won’t start, photograph the alarm and call a 24-hour generator company.

Can I rent a generator in Houston during an outage?

Yes. Kemah Emergency Generator rents generators with delivery in the Bay Area, and GenSolutions supplies generators quickly for businesses. Rental availability drops fast before and after storms.

Is it safe to use a portable generator while my standby unit is down?

Yes, if it runs outdoors, at least 20 feet from the home, and connects through extension cords or an installed interlock, never a wall outlet. Use CO alarms indoors.

Related Houston Generator Guides

• Generator Repair Houston
• Generac Generator Repair Houston
• Generator Maintenance Houston
• Portable Generator Repair Houston
• RV Generator Repair Houston

Conclusion

A failed generator in a Houston outage is stressful, but a calm ten-minute check and the right phone number go a long way.

• Read the alarm, check AUTO mode, breakers, gas and oil.
• Call a 24-hour generator company close to you, and keep a second number saved.
• Rent backup power if repairs will take days, and stay safe from CO and heat.
• Prevent the next emergency with spring maintenance and timely battery replacement.
• Compare quotes for non-urgent work through the free quote form.

About This Guide

Editorial policy

This guide was written by the Repairior Editorial Team from businesses in our Houston directory. Each company is described using only facts from its listing, website and public customer reviews. No business paid to be included or ranked.

Content transparency

Hours and availability can change, especially during storms, so confirm with the company when you call. Costs are typical estimates, not quotes. Repairior earns revenue from optional business plans, which do not affect this list.

About the author

Quesnel S is part of the Repairior Editorial Team, which researches local repair services in Houston and other US cities, reviewing business websites, service areas and customer feedback to help people find dependable help fast.

Helpful official resources: CenterPoint Energy outage center, ReadyHarris, CPSC portable generator safety and CDC carbon monoxide prevention.