Natural Gas Hookup for Generator: Complete Guide

A natural gas hookup for generator use provides a steady fuel source, ensuring power remains on during outages. 

This guide explains how homeowners can add a natural gas line for generator systems, covering safety, costs, and installation basics. Insights are shared from the experience of Robert “Bobby” Mulholland, with over 30 years in the electrical field, and Barret Abramow, co-owner and project manager at Grounded Electric.

Key Takeaways

• A natural gas hookup for generator use should always be handled by licensed gas contractors to ensure safety and compliance.
• Correct pipe sizing is crucial, as undersized lines or long runs can reduce pressure and prevent the generator from operating properly.
• Costs to add a natural gas line for generator setups range from $600 to $1,200, depending on labor, materials, and permits.
• Portable natural gas generators are flexible but less powerful than a standby generator.
• Common mistakes like using small outlets or undersized pipes can cause gas leaks or poor performance.

Adding a Gas Line for Your Generator

How Hard Is It to Add a Gas Line?

Difficulty depends on your current gas meter and supply. If they can handle more demand, the work is straightforward. If not, upgrades are required and must be done by a licensed professional.

Install or Extend Gas Line for Generator

Some properties need a new line, while others only need an extension. Even simple extensions require permits and code compliance to prevent gas leaks and pressure issues.

Quick Connect Natural Gas Line Options

Quick-connect fittings allow a portable generator to hook up without permanent piping. They are convenient but still must meet code standards.

Connecting a Generator to Natural Gas

Can You Hook Up a Generator to a Natural Gas Line?

Yes, a generator gas line installation can connect directly to an existing gas system if it is properly sized. A natural gas hookup for generator use should only be completed by a qualified contractor.

How to Install Natural Gas Line to a Portable Generator

To install a natural gas line to a portable generator, a licensed contractor will usually:

1. Run a gas line from the gas meter or main supply to a safe location outside.

2. Install a shut-off valve and regulator near the connection point.

3. Attach a flexible hose with a quick connect fitting to the generator.

4. Test the line under pressure to check for leaks and confirm code compliance.

Installing the gas line requires permits and inspections, while the final connection to the portable generator must follow code and be tested for leaks. 

Natural Gas Generator Connection vs Propane

Natural gas offers a steady supply without refilling tanks, while some homeowners compare it with the best diesel generator for backup power. Propane may work better in areas without municipal gas. Bobby Mulholland recommends weighing long-term maintenance and fuel access when making the choice.

Planning Generator Gas Line Installation

How Do You Get Natural Gas for a Generator?

Start by checking if your gas meter can handle the added load. You must also consider other appliances that draw from the same line.

Reliability of Gas Supply

Gas supply can drop in winter or during peak demand, which may affect standby generator performance. Homeowners should confirm reliability with their utility provider. If supply is inconsistent, propane may be the better option.

What Size Gas Line Do I Need for a Generator?

Size depends on generator power, BTU demand, and line distance. Examples:

• 7kW – ½ inch line
• 22kW – 1 inch line
• Longer runs may require a larger pipe

For longer runs, upsizing the pipe is required to prevent pressure drop.

How Long Can a Natural Gas Line Be?

Runs beyond 50–100 feet often require larger pipes. Pressure loss can stop a generator from working correctly. At higher elevations, upsizing or propane may be necessary.

Requirements, Sizing, and Code Compliance

Every gas line installation must follow local building codes and inspections.

Permits, Safety Risks, and Professional Help

Permits are always required. Attempting the work without approval may lead to fines, leaks, or unsafe conditions. Professional installation prevents these risks.

Installation Process Step by Step

Permitting and Utility Coordination

The first step is securing permits from the local building authority. In some cases, the gas utility must be contacted to confirm that the gas meter and supply can handle the extra demand from the standby generator. This ensures the project is legal, safe, and properly documented.

Site Preparation and Routing the Line

Once approved, the route for the new gas line is planned. The path should be as short as possible while avoiding interference with other underground or structural utilities. Trenching or drilling may be required to create a safe and accessible pathway.

Pipe Sizing and Material Selection

The installer calculates the correct pipe size based on generator load, BTU demand, and distance. Materials such as steel or polyethylene are chosen depending on whether the line runs underground or above ground. Proper sizing is critical to avoid pressure loss.

Connection to the Gas Meter or Existing Line

The new branch line is connected directly to the gas meter or another suitable tie-in point. Shut-off valves are installed to isolate the line and allow maintenance without disrupting other appliances. This step must always follow strict code requirements.

Installing Regulators and Safety Features

A regulator is installed near the generator to keep gas pressure steady and within the manufacturer’s specifications. Additional safety features, such as excess flow valves, may be required depending on local codes.

Generator Hookup and Final Connection

The generator is connected using either a rigid pipe or a flexible quick connect hose. A shut-off valve is placed close to the generator for emergency shut-down. The connection must be secure and accessible for inspection.

Pressure Testing and Final Inspection

The entire line is pressure-tested to confirm there are no leaks. Once the test is passed, a final inspection is performed by the local authority to approve the system for operation.

Maintenance for Safe Operation

Annual inspections and tests are recommended to keep the system safe. Over time, fittings and valves should be checked for wear, and regulators must be verified for proper operation. Preventive maintenance helps ensure the generator works when needed.

Cost to Install Natural Gas Line for Generator

Labor and Material Breakdown (with Table)

Costs include labor, piping, fittings, and permits. Many homeowners also review the overall gas generator cost when planning a budget.

Typical Project Duration and Timeline

Most projects take one to two days, though trenching or meter upgrades can add time.

Portable Natural Gas Generators

Benefits and Limitations

Portable units are flexible and affordable, but deliver less power than a standby generator.

When to Use Portable vs Standby

Portable units are useful for short outages. A standby generator installed system provides full backup for larger needs.

Common Problems and Solutions

Common Homeowner Mistakes to Avoid

Mistakes include tapping into BBQ outlets, running too many appliances on the same line, or using undersized piping.

 Barret Abramow notes that proper planning and professional work avoid these issues.

Troubleshooting Low Pressure or Poor Flow

Low pressure often results from small piping or a restricted gas meter. Adjustments by a licensed contractor may be required.

Portable Generator Hookup Issues

Mismatched regulators or connectors can cause poor performance. Compatibility must be checked before use.

Choosing a Qualified Installer

A natural gas connection for generator use must always be handled by licensed experts. 

Bobby Mulholland provides technical guidance, while Barret Abramow ensures projects meet high standards.

To ensure your system is designed correctly, schedule a consultation with a qualified contractor before starting work.

Disclaimer

Grounded Electric does not provide natural gas line installation services. This article is for educational purposes only, intended to help readers understand the process, safety requirements, and key considerations for adding a natural gas line for generator systems.