Texans have learned the hard way that the grid can go down for days. The February 2021 winter storm left millions of Texas homes without power in freezing temperatures, and Gulf Coast hurricanes such as Beryl in 2024 have knocked out electricity across the Houston area in the middle of summer heat. Spring thunderstorms and North Texas ice add shorter outages most years. If you are weighing a whole house generator against a portable generator, here is how they compare.
How a whole house standby generator works
A standby generator is permanently installed outside your home on a pad, much like an AC condenser. It runs on natural gas or propane and connects to your electrical system through an automatic transfer switch. When utility power fails, the switch senses the loss, starts the generator and moves your home onto generator power, usually in well under a minute. When utility power returns, it switches back and shuts the generator down.
A larger unit can carry an entire house, including central air conditioning. A smaller unit paired with load management can run the essentials and stagger large appliances so they do not all start together. A proper whole house generator installation includes a load calculation, a gas supply sized for the generator, a permit, and placement that meets the manufacturer's clearances and local code for distance from windows, doors and property lines.
What a portable generator can and cannot do
A portable generator is a gasoline or dual-fuel engine on a frame with outlets on the front. It costs far less to buy and needs no permanent installation to run a few items by extension cord. It will keep a refrigerator, a freezer, some lights, phone chargers, fans and perhaps a window air conditioner going.
The limits are real:
- Most portable units cannot run central air conditioning or electric heat.
- Someone has to wheel it out, start it, refuel it every several hours and store fuel safely.
- Gas stations may be closed or out of fuel during a widespread outage.
- It has to stay dry while running, which is hard to manage in a hurricane or an ice storm.
Portable generator safety: carbon monoxide and backfeeding
Carbon monoxide poisoning from portable generators is a recurring cause of injuries and deaths after major outages. Run a portable generator outdoors only, at least 20 feet from the house, with the exhaust pointed away from doors, windows and vents. Never run one in a garage, even with the door open. Keep working carbon monoxide alarms inside the home.
The second danger is backfeeding. Never plug a generator into a wall outlet or a dryer receptacle to power the house. That sends electricity back through the panel to the utility lines, where it can injure line workers and neighbors. It can also destroy the generator or start a fire when utility power returns.
Connecting a portable generator to your house safely
The right way is a power inlet box on an exterior wall, paired with either a manual transfer switch or an interlock kit listed for your panel. Both make sure the main breaker and the generator breaker cannot be on at the same time. You plug the generator into the inlet with one heavy cord, then choose which circuits to run from the panel. This is a job for an electrician, and it typically requires a permit. If your panel is outdated or full, an electrical panel upgrade may need to come first.
How to choose between standby and portable
These questions usually settle it:
- Do you need air conditioning or heat during an outage? In a Texas August, cooling is a health matter for older adults, young children and anyone with a medical condition. That points to a standby unit.
- Does anyone rely on powered medical equipment? Automatic backup removes the risk of nobody being able to start a portable unit.
- Is natural gas available? If not, a standby unit needs a propane tank sized for the run time you want.
- Are you often away? A standby generator protects freezers, sump pumps and pipes while you travel.
Battery backup and surge protection
A third option is a home battery, with or without solar panels. A solar battery backup system is silent, needs no fuel and switches over almost instantly, though its run time depends on battery size and how much you draw.
Whatever you choose, remember that power often comes back with voltage swings. Whole house surge protection helps protect electronics when the grid is restored and during generator transfers.
We serve homes and businesses statewide. Look for an electrician in Houston, an electrician in Corpus Christi or an electrician in Dallas, or find an electrician in your Texas city.
To talk through backup power for your home, call AA Electrical Services & Design at (888) 633-7804.