Compare
Both natural gas and propane are common fuel choices for standby generators. The right one often comes down to whether utility gas service reaches your property at all, rather than a clear-cut winner between the two.
| Feature | Natural Gas | Propane |
|---|---|---|
| Fuel supply | Continuous, from the utility line | Stored in an on-site tank, needs refilling |
| Availability | Only where utility gas service exists | Works anywhere, tank can be delivered to any property |
| Typical connection cost | $500–$2,500 | $1,000–$3,500 |
| Run-time during extended outage | Effectively unlimited, tied to utility supply | Limited by tank size, unless refilled during the outage |
| Ongoing fuel cost | Generally lower per equivalent energy unit in most U.S. markets | Generally higher per equivalent energy unit |
Bottom line
If natural gas utility service already reaches your home, it's often the more convenient and lower-cost option long-term. If it doesn't, propane is the standard alternative and works regardless of location.
