Fuel Types
The fuel a standby generator runs on affects availability, ongoing cost, and how it holds up during an extended outage. Here's what actually differs between natural gas, propane, and diesel.
A natural gas generator draws fuel directly from the utility gas line already serving the home, which is the main reason it's the more common choice wherever that service is available — there's no on-site tank to size, monitor, or refill.
A propane generator draws from an on-site storage tank rather than a utility line, which makes it the practical default anywhere natural gas utility service doesn't reach the property — most rural and many exurban installations run on propane for exactly that reason.
Diesel standby generators are more commonly associated with commercial and industrial backup power than typical single-family residential installations — most major residential standby product lines from Generac, Kohler, and Cummins are built around natural gas and propane, not diesel, which is worth knowing upfront if you're comparing options.
