Natural Gas vs Propane for a Standby Generator in Marin

Neither is universally better — it depends on your home. Natural gas is often the convenient choice if you have a gas line, because it draws continuously from the utility with no tank to refill and can run indefinitely through a long outage. Propane is the answer where there’s no natural gas line, and it offers independence from the gas utility and stores well, at the cost of a finite tank you size and refill. The main deciding factors are whether you have a gas line, your desired runtime for extended outages, and your preference for convenience versus independence.

Its continuous fuel supply. If your home has a natural gas line, the generator draws fuel directly from it, so there’s no tank to fill, monitor, or run out — the generator can run as long as gas service continues, which is effectively unlimited for most outages, including multi-day PSPS events. This makes natural gas low-hassle and well-suited to long outages, since you don’t have to worry about fuel running low at a critical moment. For homes with a gas line, that convenience and effectively unlimited runtime is the key appeal over stored fuel.

Propane’s advantages are independence and flexibility. It works anywhere — you don’t need a natural gas line, making it the solution for homes without gas service. It stores stably for a long time without degrading (unlike gasoline), and having your own on-site tank means you’re independent of the gas utility, which some homeowners prefer. The tradeoff is that your supply is finite: the tank must be sized for your desired runtime and refilled. For homes without natural gas, or for those who value fuel independence, propane is an excellent standby generator fuel.

Significantly. A natural gas generator runs as long as gas service continues — effectively unlimited for most outages — because it draws continuously from the utility line. A propane generator runs until its tank is depleted, so its runtime is determined by tank size and the generator’s consumption. For short outages, either handles it easily. For Marin’s sometimes multi-day PSPS events, natural gas’s continuous supply is convenient, while propane requires a tank sized large enough to cover the expected outage duration. If long-outage runtime is a priority, this difference is central to the fuel decision and to sizing a propane tank appropriately.

Then propane is typically your standby generator fuel — it doesn’t require a gas line and instead uses an on-site tank sized for your runtime needs. This is common for homes without natural gas service, and propane works very well for the purpose, storing stably and powering an appropriately sized generator reliably. You’ll work with your electrician and the appropriate fuel/tank trades to size the tank for your desired runtime, particularly for extended outages. Not having a gas line doesn’t limit your backup power options; it simply points you toward propane as the practical, effective fuel choice.

A licensed electrician handles the electrical side — sizing the generator, the transfer switch, and the connection to your home’s electrical system — while the fuel connection (natural gas line or propane tank and lines) involves the appropriate licensed fuel/gas trades, coordinated as part of the project. Standby generator installation is a permitted, professional job precisely because it integrates electrical and fuel systems safely. Your electrician can guide the fuel choice based on your home and coordinate the overall installation. Given the integration of power and fuel, and the safety and code requirements, professional installation by the proper trades is essential.