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A Practical Guide to Choosing and Using Natural Gas Generators

When the power goes out, the first thing most people think about is keeping the lights on and the refrigerator running. But for homeowners who want a cleaner-burning fuel option or already have natural gas plumbed to the house, natural gas generators offer a smart alternative to traditional gasoline models. I have spent years working with both portable and standby units, and I can tell you that the choice between fuel types often comes down to convenience, cost, and how you plan to use the generator.

Natural gas is widely available in many urban and suburban areas. It burns more cleanly than gasoline or diesel, produces less carbon buildup in the engine, and does not go stale after a few months in a can. That last point is a big deal. I have seen more than one gasoline generator refuse to start because the fuel left in the tank had turned into varnish. Natural gas, piped directly from the utility, never goes bad. That alone makes these units appealing for standby duty.

How Natural Gas Generators Work

A natural gas generator is essentially an internal combustion engine tuned to run on methane-rich gas rather than liquid fuel. Most of these units are dual-fuel capable, meaning they can also run on propane. That flexibility is useful if you live in an area where propane delivery is common or if you want a backup fuel source. The engine, the alternator, and the control panel are all similar to what you find in a gasoline generator. The difference lies in the carburetion and fuel metering system.

Because natural gas has a lower energy density than gasoline, you typically see a small reduction in maximum power output, usually around 10 to 15 percent. That means a generator rated at 10,000 running watts on gasoline might deliver only 8,500 to 9,000 running watts on natural gas. You need to account for that when sizing your unit. I always recommend looking at the running watts and surge watts ratings for the fuel you plan to use most often.

Key Brands and Models

Several manufacturers produce reliable natural gas generators. Generac is probably the most recognized name in the standby generator space. Their Guardian series includes models designed specifically for natural gas, with automatic transfer switches built in. Westinghouse also makes a range of dual-fuel portable generators that can run on natural gas or propane. Their WGen series has been a solid performer for light commercial and residential backup. Champion offers dual-fuel portables too, often with a convenient quick-change hose kit. DuroMax has a reputation for building heavy-duty units that handle continuous runtime well. And Honda, while best known for its inverter generators, produces some of the quietest and most efficient natural gas models on the market.

When I recommend a brand to someone, I look at the availability of service parts, the warranty, and how easy it is to switch between fuels. A unit that requires a technician to convert it from propane back to natural gas is less convenient than one with a built-in selector valve.

Portable vs Standby vs Inverter Generators

The type of generator you choose depends on your needs. Portable generators are small enough to move around and are usually the most affordable option. They are great for camping, job sites, or powering a few critical circuits during an outage. But they require you to manually start them, run extension cords, and store fuel. Many portable models can now run on natural gas, and some come with a hose that connects directly to a gas outlet.

Standby generators are permanently installed outside the home, hardwired into an automatic transfer switch (ATS). When the utility power fails, the ATS senses the loss and tells the generator to start. Within seconds, the generator takes over and powers your whole house or selected circuits. These units are almost always configured for natural gas or propane. The installation cost is higher, but the convenience is unmatched. I have installed dozens of these, and the peace of mind they provide is worth the investment for people who work from home or have medical equipment that cannot be offline.

Inverter generators use a different technology. They produce cleaner power with less harmonic distortion, making them safer for sensitive electronics like laptops and variable-speed refrigerators. Honda is famous for its inverter generators, and some of their models can run on natural gas with a conversion kit. If you plan to power electronics directly, an inverter generator is a good choice, but they tend to cost more per watt.

Wattage, Sizing, and the Transfer Switch

Getting the size right is the most common mistake I see. People look at the surge watts and think that is the continuous rating. That is not how it works. Surge watts handle the momentary starting current of a motor, like a well pump or air conditioner compressor. Running watts is the power the generator can supply continuously. For a natural gas generator, you need to calculate the total running watts of everything you want to run at the same time, then add a 20 percent buffer. Then check that the surge watts can handle the largest motor start-up.

For a home standby system, the automatic transfer switch is the brain of the operation. It monitors utility power and, when the voltage drops below a threshold, signals the generator to start. Once the generator is up to speed, the ATS switches the load from the utility to the generator. When utility power returns and stabilizes, the ATS transfers back and lets the generator cool down before shutting off. This whole process happens without you lifting a finger. If you are installing a standby generator, the ATS must be rated for the full current of the circuits it controls.

Fuel Supply and Safety

One of the biggest advantages of natural gas generators is that you do not have to store volatile fuel in a can. Gasoline degrades over time, spills leave a smell, and storing it in a garage or shed carries a fire risk. Natural gas comes from the utility line, so you never run out unless the gas utility goes down. That said, in a major earthquake or gas-line break, the utility might shut off gas service. That is why some people choose dual-fuel setups that can also run on propane, which you can store in tanks on your property.

Safety is critical. Every generator, regardless of fuel, must be placed outdoors in a well-ventilated area. Carbon monoxide is odorless and deadly. A CO detector in the living space is a good idea if you run a generator during an outage. For natural gas generators, you also need to be aware of the gas line pressure. Most residential gas lines deliver low pressure, and the generator must be configured for that. If you have a larger unit, you might need a gas regulator or a larger pipe to supply enough volume. I have seen installations where undersized gas piping starved the generator of fuel, causing it to run poorly or shut down under load.

The EPA and NEC set standards for generator emissions and installation. Natural gas generators generally produce fewer pollutants than diesel or gasoline, which can help meet local air quality regulations. The NEC requires that standby generators be installed with proper clearance from structures and that the electrical connection be made through a transfer switch to prevent backfeeding. Backfeeding is dangerous and illegal because it can electrocute utility workers trying to restore power.

Practical Tips from the Field

If you are considering a natural gas generator, here are a few things I have learned from years of installations and maintenance:

  • Always test the generator under load at least once a month. Let it run for 15 to 20 minutes with a realistic load to keep the engine dry and the seals lubricated.
  • Use a flexible gas line connection to the generator to avoid stress on the pipe fittings. Vibration from the engine can loosen rigid connections over time.
  • If you live in a cold climate, consider installing a cold-weather kit that includes a battery heater and crankcase heater. Natural gas generators can be harder to start in freezing temperatures because the fuel does not vaporize as easily.

I have also found that keeping a spare ignition spark plug and a gas shutoff valve wrench near the generator saves a lot of frustration. And do not trust the automatic exercise timer alone. I once had a Generac unit that exercised every week for two years without ever actually transferring the load. When a real outage hit, the ATS failed to switch because a contact had corroded. Manual testing under load would have caught that.

Another tip: if you plan to use a portable generator on natural gas, make sure you have a quick-connect hose that is long enough to reach from the gas outlet to the generator location. The generator must be at least 5 feet from any window, door, or vent. That sometimes means you need 25 or 50 feet of hose. Do not skimp on the hose quality. A kinked or undersized hose can restrict gas flow and reduce power output.

Final Thoughts

Natural gas generators fill a specific niche. They are not the cheapest option upfront, and they require a professional installation if you want a permanent standby system. But for anyone who already has natural gas in the home, the convenience of never having to haul fuel cans or worry about gasoline going bad is hard to beat. I have seen families rely on a natural gas generator for days after a hurricane, and the only maintenance they needed was an oil check and a visual inspection of the gas line.

If you are handy, you can install a small portable natural gas generator yourself, but I strongly advise hiring a licensed electrician for any connection to your home's electrical panel or gas supply. Mistakes can be costly and dangerous. And always check your local codes before buying. Some municipalities restrict the use of natural gas generators in certain zones or require permits.

Whether you choose a Champion portable, a Generac standby, or a Honda inverter model, the key is to match the generator to your real power needs and your fuel supply. I have seen too many people buy a unit that is too small, then wonder why their well pump trips the breaker. Take the time to do a load calculation. And if you are on the fence between gasoline and natural gas, think about the long-term convenience. Natural gas generators are not for everyone, but for the right homeowner, they are a clean, reliable, and low-hassle solution.