How Much Does a Natural Gas Generator Cost? [2025 Data]
The average natural gas generator costs $12,000, but it can range between $10,000 and $13,000, depending on labor and capacity.
The average natural gas generator cost is $12,000, though installation prices can range anywhere between $2,000 and $25,000. Natural gas generators are whole-home standby generators that are connected to your home’s natural gas line. Since they run on natural gas, they offer the advantage of a virtually unlimited fuel supply, making them a convenient and long-term solution for emergency power. This guide will cover average costs and other considerations when planning your budget.
National Gas Generator Cost Factors
Here are the main factors to consider when installing this type of generators.
Types
Most natural gas generator installations feature an automatic transfer switch that detects an outage and starts the unit automatically. While uncommon, manual start units cost significantly less, but are not suitable for homes with frequent outages.
| Generator Type | Description | Average Cost |
|---|---|---|
| Manual Start | Powered via a pull cord or electrical switch; only suitable for homes with rare outages | $2,000–$4,000 |
| Automatic Start | Wired into the electrical panel via an automatic transfer switch | $2,000–$25,000 |
Size
The size of the natural gas generator directly impacts your budget for this installation. Larger units provide more power but require a larger initial investment.
| Generator Size in Kilowatts | Average Cost |
|---|---|
| 7.5–10 | $2,000–$3,500 |
| 14–18 | $4,000–$5,500 |
| 20–24 | $5,000–$6,500 |
| 26–32 | $6,500–$15,000 |
| 36–38 | $14,000–$16,000 |
| 45–48 | $16,200–$25,000 |
Labor
Hiring a licensed local general contractor is essential for a safe and code-compliant natural gas generator installation. Labor costs will depend on factors like local rates, permitting requirements, and whether any additional electrical work is needed.
National Gas Generator Ongoing Costs
Apart from the initial upfront investment, these are a few ongoing costs to consider when planning your budget for a natural gas generator.
Operating Costs
Costs for operating a natural gas generator range anywhere from $2,000 to $21,000 per year. Actual operating costs can vary significantly depending on the size of the generator, frequency of use, and fuel prices. If your generator is running frequently due to power outages, the annual operating costs will increase accordingly.
Repairs
Repairs for natural gas generators range between $500 and $3,000 per year. The cost of repairs will vary based on the extent of damage or malfunction. While well-maintained generators often experience fewer issues, it’s important to budget for unexpected repairs.
Maintenance
Regular maintenance for your natural gas generator costs between $200 to $1,000 a year. Maintenance tasks include oil changes, battery checks, and air filter replacements. This is one additional expense that you won’t want to skip, as it ensures the safety and functionality of your generator, helping you get the most from its lifespan.
DIY National Gas Generator Installation vs. Hiring a Pro
DIY installation is not an option for natural gas generators. These units must be connected to both your home’s natural gas line and main power supply, making the installation highly technical and requiring compliance with local building codes and safety regulations. Improper installation can lead to serious hazards, such as gas leaks, carbon monoxide exposure, and electrical failures.
A professional who installs generators ensures the generator is correctly sized, securely installed, and safely integrated with your home’s electrical system, preventing potential hazards and ensuring compliance with local code regulations.
5 Ways You Can Save Money on a National Gas Generator
Follow these tips to cut down the cost of investing in a natural gas generator.
Calculate the electrical load of your necessary systems, appliances, and electronics to avoid purchasing a unit with a larger wattage capacity than necessary.
Schedule your generator installation during a contractor’s slow season (late winter or early spring) for potential discounts.
Opt for a manual transfer switch (when feasible) if you don’t mind manually switching power.
Get several quotes from licensed contractors to find the best deal before hiring.
Schedule regular maintenance visits for your generator to avoid costly repairs and extend its lifespan.
How Angi Gets Its Cost Data
Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We extensively research project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We rely on reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects.
Want to help us improve our cost data? Send us a recent project quote to costquotes@angi.com. Quotes and personal information will not be shared publicly.
Frequently Asked Questions
While natural gas generators are costly, they’re a great option for standby power due to the reliability of natural gas as a fuel source. Unlike other fuels, natural gas is delivered through underground pipes, making outages extremely rare and less likely to be affected by the elements. As long as the area isn’t prone to earthquakes, they offer an unlimited supply of natural gas that doesn’t degrade over time or require storage in tanks.
If you’re wondering whether gas generators produce carbon monoxide, know that natural gas generators do not produce carbon monoxide if they are functioning properly, as natural gas burns cleanly. However, if the generator malfunctions and the gas does not burn completely, there is potential for carbon dioxide to be produced. To prevent malfunctions, it's crucial to perform regular maintenance, including running the generator weekly and scheduling professional inspections every 6 to 12 months. Also, be sure to test your carbon monoxide detectors regularly to ensure they function in the rare case of the generator producing carbon monoxide.
It’s recommended to change a natural gas generator’s oil after every 100 to 200 hours of operation, depending on the model and operating conditions. Generators used in harsh weather conditions or for prolonged periods may require more frequent oil changes. Regular oil changes prevent engine wear and overheating, plus they help ensure optimal performance. Always consult your generator's manual for specific guidelines and keep up with professional maintenance to ensure your unit is properly maintained.
If installed and maintained properly, a natural gas generator can last around 20 to 30 years. To help you get the most from your natural gas generator’s lifespan, always maintain annual service visits from a technician. Also, be sure to clean the generator monthly, especially in dusty environments, and address any issues you find promptly to prevent further damage.
