Natural Gas vs. Propane Standby Generators
Whole-house standby generators typically run on either natural gas from an existing utility line or propane from an on-site tank, and the right choice often comes down to what's actually available at your home.
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Natural Gas Generator
Runs on natural gas supplied continuously from the utility line, similar to a gas furnace or stove.
- Continuous fuel supply with no tank to monitor or refill
- No need to arrange fuel deliveries
- Only available in homes with access to a natural gas utility line
- Generator won't run if there's a disruption to gas utility service itself
Propane Generator
Runs on propane stored in an on-site tank, which is refilled periodically.
- Available anywhere, including homes without natural gas utility access
- Propane supply is independent of utility gas service disruptions
- Requires monitoring tank levels and scheduling refills
- Additional cost if a new propane tank needs to be installed
Which one makes sense for you?
Natural gas is generally the simpler, lower-hassle choice for homes that already have a utility gas connection, since there's no tank to monitor. Propane is the necessary choice for homes without natural gas access, and has the added benefit of being independent from utility gas service — which can matter if a major outage event also disrupts gas utility service itself.
Key cost factors.
- Whether the home already has a natural gas utility connection
- Whether a propane tank is already on-site or would need to be added
- How often and reliably fuel needs to be available during extended outages
- Local availability and cost of each fuel type
Before you decide.
- Do we already have a natural gas utility connection at the home?
- If not, would a new propane tank installation be needed, and what does that add to cost?
- How reliable is our natural gas utility service during major storm events?
Frequently asked questions.
How long can a propane tank run a standby generator during an extended outage?
This depends heavily on tank size and generator load, but homeowners in areas prone to extended outages often size their propane tank specifically to support several days of generator runtime.
All figures on this page are illustrative examples for general education, not quotes, appraisals, or guarantees of actual pricing. Actual costs vary by provider, location, project scope, and market conditions — always get a specific quote before making a purchasing decision.
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