A Dallas power outage rarely arrives at a convenient time. Maybe you’re trying to keep the kids’ dinner warm, finish a work call, or save a refrigerator full of groceries. During one winter storm, plenty of families found themselves charging phones in the car while waiting for the lights to come back on.
That is why so many homeowners ask us the same question during generator consultations:
Should I choose propane or natural gas for my standby generator?
The honest answer is: it depends on your home, your existing utility service, your desired runtime, and local placement requirements. Neither fuel is automatically right for every Dallas or DFW property.
This guide will walk you through the practical differences so you can make an informed choice.
The short answer: Which fuel is better?
Natural gas is often the most convenient option for Dallas-area homeowners who already have a properly sized natural gas service. It does not require an on-site storage tank, and it can provide effectively continuous runtime as long as utility service remains available.
Propane can be the better choice for homes without natural gas service, properties on the rural edges of DFW, or homeowners who prefer to store fuel on-site and remain less dependent on the gas utility.
The best fuel is the one your property can safely and reliably support.
A Kohler standby generator can operate on either natural gas or liquid propane, but the installation requirements are different. That is where a professional sizing evaluation matters.
1. How each fuel gets delivered and stored
Natural gas
Natural gas is delivered to your home through underground utility lines. A standby generator connects to the home’s gas system and uses fuel whenever it is running.
That means:
- No fuel delivery is needed during an outage.
- There is no large tank taking up yard space.
- Runtime is not limited by the amount of fuel stored at your home.
- The gas meter and piping must be able to support the generator and your other appliances.
Natural gas is common throughout developed parts of the Dallas-Fort Worth area, but availability varies by neighborhood and address. Even if your home has natural gas service, the existing infrastructure may not have enough capacity for a whole-house generator.
Propane
Propane is delivered by truck and stored in a tank on your property. The generator draws liquid propane from that tank as it operates.
Propane offers some important advantages:
- Fuel is stored on-site.
- You are not relying on a gas utility line during an outage.
- It can work well for homes without natural gas service.
- A properly sized tank can support several days of operation.
The tradeoff is that the tank takes up space, requires proper placement, and must be kept filled. A small tank may be fine for occasional short outages but may not provide enough fuel for a longer event.
2. What does each fuel cost per outage hour?
Fuel prices change, and generator load changes constantly. Your air conditioner starting, electric water heater running, or well pump cycling can all affect consumption.
Still, a simple estimate is useful.
For a typical 20 kW-class standby generator operating at approximately half load, a reasonable planning range may be:
- Natural gas: approximately 190–210 cubic feet per hour
- Propane: approximately 1.8–2.2 gallons per hour
For example, using illustrative fuel prices of $1.25 per therm for natural gas and $2.50 per gallon for propane:
- Natural gas may cost roughly $2.40–$2.65 per hour
- Propane may cost roughly $4.50–$5.50 per hour
At full load, consumption can be considerably higher. A 20 kW-class unit may use approximately 290–320 cubic feet of natural gas per hour or 3.2–3.6 gallons of propane per hour, depending on the specific model.
These are planning estimates, not a quote. The exact figures depend on the Kohler model, load, fuel pressure, fuel quality, and local energy prices.
To estimate runtime, divide usable fuel by the generator’s hourly consumption.
For example, if a tank has 400 usable gallons and the generator uses 2 gallons per hour at your expected load:
400 gallons ÷ 2 gallons per hour = approximately 200 hours
In practice, homeowners should not plan to use every last gallon in a propane tank. Fuel delivery timing, tank level, cold weather, and changing electrical demand all deserve some margin.
For current generator options, see Kohler’s home generator lineup.
3. Propane tank size, placement, and HOA concerns
Propane tank sizing depends on three things:
- The generator’s fuel consumption
- The electrical load you expect during an outage
- How many hours or days of runtime you want to cover
A smaller tank may support shorter outages, while a 250- or 500-gallon tank provides more reserve for multi-day events. The right choice is not simply “the biggest tank possible.” Your property layout, expected load, delivery access, and local requirements all matter.
Tank placement can also become a concern in Dallas-area neighborhoods. A propane tank may need to meet setbacks from buildings, property lines, ignition sources, driveways, and other structures. Above-ground tanks may also need screening or landscaping.
If you live in an HOA, check the rules before committing to propane. Some associations are more comfortable with a compact generator enclosure than with a large visible fuel tank. In certain neighborhoods, burial or screening may be possible, but that adds design, permitting, and installation considerations.
4. Can your natural gas line support a whole-house generator?
This is one of the most important, and most frequently overlooked, questions.
Your home’s gas service may already supply a furnace, water heater, fireplace, pool heater, or outdoor kitchen. Adding a standby generator increases the total demand, particularly when the generator is operating at full load.
A professional evaluation should verify:
- The natural gas meter’s capacity
- The service pressure
- Existing pipe size and length
- The generator’s required BTU input
- The combined demand of all gas appliances
- Whether a utility meter or service upgrade is needed
A typical 20- to 22-kW generator may require roughly 300,000 BTU per hour at full load, though exact requirements vary by model and fuel. If the existing service is undersized, the solution might involve larger piping, a meter change, or coordination with the utility.
Having natural gas at the house does not automatically mean the house is generator-ready.
That is why Verdegy includes fuel-service review in the sizing process rather than simply connecting a generator and hoping for the best.
5. How do propane and natural gas perform in cold weather?
Both fuels can operate reliably during Dallas winters, including freezing conditions. Kohler standby generators are designed for demanding weather, and Kohler provides cold-weather accessories for installations exposed to prolonged low temperatures.
Natural gas has one practical advantage: it arrives through a utility line, so there is no on-site tank whose vaporization capacity must support the generator.
Propane depends on tank vaporization. In very cold conditions, a small or nearly empty tank may struggle to vaporize enough fuel for a high-demand generator. Dallas does not regularly experience the extreme cold found in northern climates, but winter storms can still bring freezing temperatures and extended outages.
For propane systems, larger tanks and maintaining an adequate fuel level provide more operating margin.
6. Noise, emissions, and maintenance
Both natural gas and propane standby generators produce engine noise and exhaust emissions while running. Placement, model selection, enclosure design, and distance from living areas all affect how noticeable the unit will be.
A properly installed Kohler generator should be located according to manufacturer instructions and local code, not simply tucked wherever it fits best.
Fuel choice also affects maintenance in practical ways:
Natural gas maintenance considerations
- No tank level to monitor
- No scheduled propane delivery
- Gas piping and connections still require inspection
- Utility interruptions can affect availability
Propane maintenance considerations
- Tank level must be monitored
- Fuel deliveries need to be arranged
- Tank, regulator, and lines require inspection
- Long outages may require a larger reserve
Regardless of fuel, the generator itself needs routine service. Verdegy recommends ongoing annual maintenance so the unit is ready before the next outage, not after the first warning siren or ice storm.
7. Which fuel is right for your Dallas home?
Natural gas may be the better fit if:
- Your property already has natural gas service
- The meter and piping can support the generator
- You want the lowest typical operating cost
- You prefer effectively unlimited runtime
- You want to avoid a visible propane tank
- Your HOA has strict landscaping or placement requirements
Propane may be the better fit if:
- Natural gas is not available at your property
- You live outside a developed utility service area
- You want fuel stored on-site
- You prefer less dependence on the gas utility
- You have room for a properly sized tank
- Your HOA and local requirements allow the installation
The right generator size also matters. A whole-house unit is not selected based on square footage alone. We consider air-conditioning startup loads, electric heating, water heaters, refrigerators, pumps, cooking appliances, medical equipment, and the circuits you want powered during an outage.
Verdegy can evaluate the complete system
Choosing between propane and natural gas is only one part of a reliable standby power installation. The generator must be correctly sized, the fuel supply must be adequate, and the placement must satisfy local requirements.
Verdegy provides free consultations and sizing evaluations for homeowners throughout Dallas and surrounding DFW communities. Our Kohler-trained technicians can review your electrical load, fuel access, tank or gas-line requirements, generator location, and city-specific permitting needs.
We handle the turnkey installation, including permits and inspections, so you do not have to chase paperwork or coordinate every contractor yourself. After installation, our maintenance services help keep the system ready for the moment the grid goes down.
When you are ready to compare your options, contact us for a free evaluation.
Call us for a quote (leave a message): 214-207-0506.
Because with Dallas power, it is not a matter of if the outage will happen. It is a matter of when, and whether your home will be ready.