Propane vs. Natural Gas for Standby Generators
How the two most common standby fuels compare — and why propane often fits rural properties.
Quick answer
Standby generators commonly run on either propane or natural gas, and neither is universally better. Natural gas is supplied continuously by a utility line, so there's no tank to refill, but it's only available where gas service exists. Propane is stored on site in a tank, which makes it practical for rural properties without gas service — the trade-off is managing tank capacity. For many Northern Wisconsin rural properties without natural-gas service, propane is the practical standby fuel.
The best fuel is usually the one already available at your property — natural gas where there's service, propane where there isn't.
| Propane | Natural gas | |
|---|---|---|
| Supply | Stored on-site in a tank | Continuous from a utility line |
| Availability | Available anywhere a tank can be placed | Only where gas service exists |
| Utility dependence | Independent of a gas utility | Depends on the gas utility |
| On-site storage | Requires a tank you manage | No on-site storage needed |
| Rural fit | Often practical for rural properties | Depends on service reaching the property |
| Refueling | Tank must be refilled | No refilling — piped supply |
Supply
Propane
Stored on-site in a tank
Natural gas
Continuous from a utility line
Availability
Propane
Available anywhere a tank can be placed
Natural gas
Only where gas service exists
Utility dependence
Propane
Independent of a gas utility
Natural gas
Depends on the gas utility
On-site storage
Propane
Requires a tank you manage
Natural gas
No on-site storage needed
Rural fit
Propane
Often practical for rural properties
Natural gas
Depends on service reaching the property
Refueling
Propane
Tank must be refilled
Natural gas
No refilling — piped supply
Natural gas arrives through a utility line, so as long as that service exists and stays intact, supply is effectively continuous. Propane is delivered and stored in a tank on your property, which means you're not dependent on a gas utility — but you are responsible for keeping the tank supplied.
Natural gas isn't available everywhere
In much of rural Northern Wisconsin, natural gas service simply doesn't reach the property. Where that's the case, propane is often the practical option rather than a compromise.
With propane, tank size and fill level determine how long the generator can run during an extended outage. That's something to plan around, especially for properties that see long outages. Natural gas removes the tank from the equation but ties supply to the utility.
Many rural homes already keep propane on site for heat, cooking or a shop. In those cases, adding a propane standby generator can make sense because the fuel infrastructure is already there. It's one reason propane is common on Northern Wisconsin properties.
Both fuels are clean-running compared with some alternatives and are well suited to standby use. Long-term storage characteristics differ, which is part of why propane holds up well for backup power that may sit unused between outages.
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Frequently asked questions
Frequently Asked Questions
Straight answers to what homeowners and businesses ask us most.
Neither is universally better. Natural gas offers a continuous piped supply where service exists; propane is stored on-site and works anywhere a tank can go. The right choice usually comes down to which fuel is already available at your property.
Yes. Propane is a common standby generator fuel and is especially practical for rural properties that already have a propane tank on site.
A natural gas generator depends on the gas utility for fuel. If that supply is interrupted, the generator can't run. Propane, stored on-site, isn't dependent on a gas utility — though the tank must be kept supplied.
That depends on tank size, how full it is and how much load the generator is carrying. For properties that experience long outages, tank capacity is worth planning around so the system can run as long as needed.
Related services
- Generator InstallationSizing, placement, electrical integration and transfer equipment installed as a complete system.
- Home Standby GeneratorsPermanently installed backup power that starts automatically when the grid goes down.
- Generator SizingHow standby generators are sized around real electrical loads — not square footage.
- Generac GeneratorsAutomatic standby generator systems for residential and light commercial backup power.
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