Backup Power in Texas: Generator vs Standby vs Home Battery

By the TexasPowerCost Editorial Team — independent Texas electricity analysis · Last reviewed October 18, 2026 · how we analyze plans

Last updated: October 3, 2026  ·  10 min read

Texas homes lose power two different ways — short rotating outages ordered by ERCOT when the grid runs short, and long local outages when a hurricane or ice storm takes the wires down — and the right backup depends on which one you are planning for. This guide compares the three options on cost, run-time and fit.

Generator vs battery backup in Texas: which one fits your outage?

Start with the outage, not the hardware. ERCOT rotating outages — ordered in an Energy Emergency Alert Level 3 — last minutes to about an hour per circuit and favor a battery. Storm-damage outages, when your transmission and distribution utility (TDU) has crews rebuilding lines, can last days and favor fuel. The table compares the three on what matters.

Cost ranges are illustrative, from published U.S. installer surveys as of October 2026; Texas quotes vary by city, fuel line and electrical panel. Get three bids.

What does each option cost to buy and install?

As of 2026 a portable generator in the 5,000–8,000 W range lists at roughly $500 to $2,000; a 20–24 kW standby unit is $5,000 to $6,500 before $1,500 to $5,000 of installation and a transfer switch; and a whole-home battery system runs $10,000 to $25,000 installed. All three are illustrative national figures, not Texas quotes.

Two Texas-specific items move the standby number: a natural-gas unit may need a larger gas meter, and a propane unit needs a tank, a pad and a delivery contract. On the battery side, the federal credit that cut the price by 30% is gone — the IRS states it "is not available for any property placed in service after December 31, 2025." What the end of the home energy credits means for Texas has the detail; are home batteries worth it in Texas covers the savings that can still offset it.

What does it cost to run per day in a multi-day freeze?

A portable generator costs fuel; a standby costs gas or propane; a battery costs nothing during the outage because its energy was bought earlier at your normal rate. The arithmetic below uses a manufacturer's published burn rate for a common 7,500 W portable and illustrative fuel prices — label them, and swap in your own.

The "up to" in every manufacturer rating matters: real burn rises with load and cold starts. Buy fuel for 25% more hours than you expect, store gasoline with stabilizer, and remember that in a regional freeze the gas station may be dark too. Propane keeps indefinitely, which is why dual-fuel portables have become the Texas default.

What can each one power — and for how long?

A portable in the 5,000–8,000 W class runs the refrigerator, a gas furnace's blower, lights, internet, phones and a window air conditioner, for as long as the fuel lasts. A 20–22 kW standby runs the whole house, central air included. A 13.5 kWh battery runs the essentials for a day or two and the whole house for hours.

The battery arithmetic is the one people get wrong. Fridge, furnace blower, lights, router and phones add up to roughly 8–12 kWh a day, so a 13.5 kWh unit with no solar is empty in a day or two, and central air at 3–5 kW or strip heat can drain it before morning. For rotating outages that end within the hour the battery is ideal; for a four-day ice storm, fuel wins. Our power outage preparation guide covers the kit, food safety and the lantern-and-cooler layer no backup system replaces.

Where does the carbon-monoxide risk come in?

From every engine. The Consumer Product Safety Commission's rule is to operate generators "outdoors only, at least 20 feet from homes and buildings, with exhaust directed away from windows, doors and vents," and it reports that nearly 100 people in the U.S. die each year from carbon monoxide (CO) poisoning from portable generators. Batteries produce no CO at all.

The deaths cluster in exactly the situations a freeze produces: a generator pulled into a garage or carport to keep it out of the sleet, or run on a porch under a window. Twenty feet means twenty feet in the weather, with battery-powered CO alarms on every sleeping floor inside. Standby units are installed with clearances for the same reason. (Source: CPSC, May 2026.)

Do I need a transfer switch, a permit or HOA approval?

If a generator will feed your house wiring, yes to the transfer switch or a listed interlock kit, installed by a licensed electrician — never a cord from the generator into a wall outlet. That "back-feed" energizes the utility's lines and can electrocute the crew restoring your neighborhood. A standby install also needs electrical and usually gas permits.

Portables used with extension cords to individual appliances need no permit; the moment you want the furnace blower or any hard-wired circuit, you need the switch or interlock. Texas homeowners associations routinely regulate standby placement, screening and noise, so get written approval before the pad goes in, and ask the gas utility whether your meter can feed a 20 kW unit on top of the furnace and water heater. Renters are usually limited to a portable or a plug-in battery, which need no modification to the home.

What happens to gas and propane supply in a long freeze?

A natural-gas standby depends on the gas system working through the storm; a propane unit depends on the tank you filled before it and the delivery truck after. February 2021 showed that gas supply and pressure can be stressed in a deep freeze, so a natural-gas unit is not automatically the "unlimited fuel" option its brochure implies.

The hedge is simple: with natural gas, keep a portable and a few propane cylinders as a fallback for the essentials; with propane, size the tank for a week at half load and fill it in November, not when the forecast turns. Gasoline is the weakest long-outage fuel because stations need power to pump and it degrades within months. Plan the fuel as carefully as the hardware.

Who needs backup power most in Texas — and what should they pick?

Households with medical equipment, homes on the Gulf Coast hurricane path, and all-electric homes in ice-storm country need it most. Everyone else is buying insurance against a few short outages a year, and should spend accordingly. The table matches the common situations to the option that fits.

On the medical row: Texas lets customers with qualifying conditions register as Critical Care or Chronic Condition residential customers, which adds notice protections but, as our guide to those designations explains, does not keep the power on during a load-shed event or a storm. The backup plan has to be yours.

Is a home battery worth it on its own?

As pure insurance against multi-day storms, rarely; as a daily tool that also covers short outages, often. A battery earns its keep by shifting usage on a time-of-use plan, joining a Texas virtual power plant, or pairing with solar — the backup is the bonus. Are home batteries worth it in Texas? runs those numbers.

How to size a backup power plan in five steps

1. List the loads you must keep running

For most homes that is the refrigerator, the furnace blower (gas heat still needs electricity for the fan), a few lights, phone and internet, and any medical device. Note the wattage on each label.

2. Estimate the hours per day and the kilowatt-hours

Multiply watts by hours and divide by 1,000. A fridge, blower, lights and electronics typically add up to 8 to 12 kWh a day, which is the number a battery must store or a generator must produce.

3. Decide which outage you are planning for

ERCOT rotating outages last minutes to an hour; storm-damage outages after a hurricane or ice storm can last days. The first favors a battery, the second favors fuel.

4. Pick the option that matches the outage and the budget

Use the decision table on this page. If medical equipment is involved, plan for the long outage regardless of how rare it is, and register for Critical Care status with your provider.

5. Install it safely and test it twice a year

Generators connect to house wiring only through a transfer switch or a listed interlock installed by a licensed electrician, run 20 feet from the house, with CO alarms inside. Run every system for 20 minutes each spring and fall so it works when it matters.

Key Takeaways

• A 7,500 W portable generator burns about 0.8 gallons of gasoline an hour at half load by its manufacturer's rating — roughly $19–$29 a day at 8–12 hours and $3 a gallon — and about 0.9 gallons of propane an hour.
• Illustrative 2026 costs: portable $500–$2,000; standby 20–22 kW roughly $7,000–$13,000 installed; whole-home battery $10,000–$25,000, with no federal 25D credit for property placed in service after December 31, 2025.
• CPSC: run generators outdoors only, at least 20 feet from the house with exhaust pointed away from openings; nearly 100 U.S. deaths a year are attributed to generator carbon monoxide.
• ERCOT rotating outages last minutes to about an hour per circuit and favor a battery; storm-damage outages can last days and favor fuel — and the TDU, not your retail provider, restores the lines.

Common Questions

Is a whole-house generator worth it in Texas?

It is worth it for households that lose power for days at a time, run medical equipment, or live where hurricanes and ice storms take lines down regularly. For a home that sees a few short outages a year, the installed cost of a 20 to 22 kW standby unit — roughly $7,000 to $13,000 as of 2026 once the unit, transfer switch and labor are added — buys more capacity than the outages justify, and a portable generator or a home battery covers the same hours for far less.

Which is better for a Texas power outage, a generator or a battery?

It depends on the outage. For ERCOT rotating outages, which last minutes to an hour per circuit, a home battery is quieter, instant and needs no fuel. For a multi-day outage after a hurricane or ice storm, a fuel generator keeps running as long as you can keep it fed, while a battery without solar is empty within a day or two of normal use. Many Texas homes end up with a portable generator for the long outages and a battery or power station for the short ones.

How much does it cost to run a portable generator per day?

A 7,500-watt portable at half load burns roughly 0.8 gallons of gasoline an hour by its manufacturer's rating, about 19 gallons a day if it never stops — around $57 at an illustrative $3 per gallon. Most households run a portable 8 to 12 hours a day in cycles, which brings the fuel bill to $20 to $30 a day. The same unit on propane burns about 0.9 gallons an hour at half load, so a 20-pound tank lasts roughly five hours.

Can a home battery power my whole house during an outage?

Briefly. A typical 13.5 kWh home battery stores about a third of what an average Texas home uses in a day, and its inverter limits how many large loads run at once. Backed only by the grid, it keeps the fridge, lights, internet and a furnace blower going for a day or two; it will not run central air conditioning or strip heat for long. Paired with rooftop solar it can stretch for days in sunny weather, which winter in Texas does not always provide.

How far from the house should a generator be?

At least 20 feet, outdoors only, with the exhaust pointed away from windows, doors and vents — the Consumer Product Safety Commission's standing rule. Never run one in a garage, carport, porch or basement, even with doors open. CPSC reports that nearly 100 people in the U.S. die each year from carbon monoxide poisoning from portable generators, and battery-powered CO alarms inside the house are the backstop if a neighbor's unit is placed badly.

Do I need a permit or HOA approval for a standby generator in Texas?

Usually both. A permanently installed standby generator involves an electrical permit for the transfer switch and often a gas or plumbing permit for the fuel line, pulled by the licensed contractor doing the work; cities inspect the result. Homeowners associations commonly regulate placement, screening and noise, so get the location approved in writing before the concrete pad is poured. Portable generators and plug-in home batteries generally need no permit, though a transfer switch or interlock for a portable does.

Key Terms

ERCOT · TDU / TDSP · Kilowatt-hour (kWh) · Customer Rights · Grid Infrastructure Terms · Full Glossary →

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ERCOT grid alerts explained covers the Energy Emergency Alert ladder that leads to rotating outages and lists every TDU's outage number; how to find your provider and TDU tells you whose crews will be on your street; and the Texas winter electricity checklist schedules the fuel and the test run into November.