Sizing a Standby Generator | Natural Gas and Propane

When choosing a standby generator for your Texas home, size selection is important. You need to determine if you prefer to back up your entire house or only power specific essentials such as your refrigerator, lights, internet, and phone.

Generators are rated based on their kilowatt rating. The higher the kilowatts, the more household appliances your home can power on. See the six yes-no questions you’ll need to answer for a certified dealer-installer to provide an initial quote.

You can use the following table to help you get a general idea of what size generator is best for your home. However, keep in mind that there is no substitute for a load analysis by a certified standby generator professional to ensure that you select a generator that’s the right size for your home.


Furnace FanXXXFor greater than 200-amp service in larger homes and small businesses


Sump PumpXXX




Well PumpXXX






Garage Door OpenerXXX


Security SystemXX


Central A/C SystemXX
Water HeaterXX
Washing MachineXX
Electric RangeXX
Clothes DryerX
Microwave OvenX
Toaster OvenX
Extensive Power RequirementsX



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You should always read a plan’s EFL details to decide if it’s a fit for you, but our system does the tedious math to help you compare estimated costs. Of course, your future bill amounts will depend on your future usage.

You will find a widget on Home Energy Club which fetches your home’s energy usage data from Smart Meter Texas (SMT) and runs calculations of the rate structures of energy plans to help you conveniently estimate the cost of energy plans you are considering, based on your prior 12 months of energy usage as reported by SMT.

In one of the text panels of the widget, you will see an authorization button. By checking the permission box above the fields in which you enter your name and email address, and clicking on the authorization button, you are authorizing Smart Meter Texas to provide us with your location’s energy usage information so that our system can run cost calculations. It’s important to note that errors can occur when developing and running calculations, and the Company does not guarantee that its cost numbers are correct. You should always read the Electricity Facts Label (EFL) for each energy plan you are considering before enrolling, and make an independent decision on whether the plan is an appropriate fit for your home based on your own calculations and all the information disclosed by energy providers in the EFL.

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