At NineX Power Systems, we provide reliable Natural Gas Engines for Sale to support a wide range of industrial and commercial applications. Whether you’re upgrading existing equipment, replacing an aging engine, or installing a new power system, our team is committed to helping you find the right solution. We offer new, used, and professionally rebuilt Natural Gas Engines that deliver dependable performance, efficiency, and long-term value.
Our inventory includes Natural Gas Engines for Industrial operations from trusted OEMs manufacturers such as Caterpillar, Cummins, Waukesha, and PSI. Every engine is thoroughly inspected and tested to ensure it meets high standards for quality and reliability. With a variety of horsepower options available, we can help you select an engine that matches your specific operational requirements and budget. If you’re not sure which engine is right for your application, our experienced team is ready to assist every step of the way.
-

CAT G3512 SITA Engine Core
- $26,500.00
- Year : 1992
- Hours :
- Condition : Rebuildable Core
- Stock # : 1907
-

CAT G3512 SITA Engine Core
- $26,500.00
- Year : 1992
- Hours :
- Condition : Rebuildable Core
- Stock # : 1908
-

Used CAT G3412C Engine
- $35,000.00
- Year : 2008
- Hours :
- Condition : Running Take Out
- Stock # : 1793
-

Used CAT G3412C Engine
- $35,000.00
- Year : 2008
- Hours :
- Condition : Running Take Out
- Stock # : 1794
-

Used CAT G3412C Engine
- $35,000.00
- Year : 2008
- Hours :
- Condition : Running Take Out
- Stock # : 1795
-

Used CAT CG137-12 Engine
- Call for Pricing
- Year : 2014
- Hours : 22,304
- Condition : Good Used
- Stock # : 1925
-

Used CAT CG137-12 Engine
- Call for Pricing
- Year : 2014
- Hours : 26,184
- Condition : Good Used
- Stock # : 1926
-

Used CAT CG137-12 Engine
- Call for Pricing
- Year : 2014
- Hours : 32,217
- Condition : Good Used
- Stock # : 1927
-

New CAT CG137-12 Engine
- Call for Pricing
- Year : 2023
- Hours : 0
- Condition : New w/ Warranty
- Stock # : 1695
-

New CAT G3406TA Industrial Engine
- Call for Pricing
- Year : 2022
- Hours : 0
- Condition : New w/ Warranty
- Stock # : 1912
Top Benefits of Using Natural Gas Engines for Industrial Applications
With rising fuel costs and tighter emissions regulations, more industries are turning to natural gas engines as a smart, future-ready solution. They provide stable performance, fewer emissions, and often require less maintenance over time, making them a cost-effective choice for operations of all sizes.
Top Benefits:
- Lower operational fuel costs
- Reduced emissions and environmental impact
- Smoother, quieter engine operation
- Compatibility with CHP (combined heat & power) setups
- Better long-term return on investment compared to diesel
If you’re looking for consistent, scalable power with fewer headaches, natural gas might be exactly what your site needs.
Natural Gas Engines for Sale – What’s in Our Inventory?
Our inventory is built to meet a range of commercial and industrial needs. Whether you're powering equipment, driving mechanical systems, or generating electricity, we’ve got an engine that fits your application.
We offer:
- Used natural gas engines with verified low hours and full documentation
- Rebuilt units that meet performance specs like new
- HP range from 95 horsepower to over 3000+ HP
- Units with and without radiators, skids, or control systems
- Custom configurations depending on use case
Every listing is detailed and transparent, no surprises, just solid equipment ready to go.
Features That Set Our Natural Gas Engines Apart
Not all natural gas engines are built the same. At NineX, we focus on engines that deliver both performance and dependability. The units we list are designed for demanding conditions, long duty cycles, and cost-efficient operation.
Core Features:
- High thermal efficiency for reduced fuel consumption
- Cleaner combustion resulting in less engine wear
- Compatibility with emission-regulated zones and green energy initiatives
- Configurable mounting options for easy installation
- Proven performance in prime power and standby scenarios
Before anything gets added to our inventory, we test for compression, load response, emissions behavior, and overall operating condition.
Where Are Our Natural Gas Engines Used?
Our natural gas engines are found in a wide variety of environments, from remote oil sites to municipal infrastructure. Whatever your industry, if it requires reliable power, you’re in the right place.
Common Use Cases:
- Power generation facilities and utility grids
- Oil & gas fields and well sites
- Manufacturing plants and processing lines
- Commercial buildings, hospitals, and data centers
If you’re unsure whether a gas engine suits your setup, give us a call, and we’ll walk through your requirements and make it simple.
We Help You Choose the Right Unit
We know that buying an engine isn’t just a transaction; it’s a critical investment. That’s why our team works directly with you to match your specific needs with the right engine.
We’ll help you:
- Determine horsepower and load demands
- Navigate emissions standards and compliance issues
- Compare new vs. used options
- Understand integration into your existing system
Need a turnkey system or just the bare engine? We’ll guide you through it, start to finish.
Logistics & Global Shipping Support
We don’t stop at selling you the engine, we help you get it where it needs to go. Whether you're located in North America or abroad, our logistics team coordinates safe, secure, and timely delivery.
We assist with:
- Crating and export prep
- Ground and freight shipping
- Custom paperwork and documentation
- Port coordination and delivery tracking
From Houston to the Middle East, we’ve shipped engines to just about every corner of the globe.
Why Buy Your Natural Gas Engine from NineX Power Systems
When you work with us, you’re getting more than a product; you’re getting a team that understands what’s at stake when power is critical to your operations.
Here’s what sets us apart:
Industry Experience
We’ve worked with businesses across power generation, oil & gas, marine, and manufacturing, so we know what makes a reliable engine and how to match it to your specific application.
Tested, Verified Equipment
Every engine in our inventory goes through thorough inspection and performance testing. We don’t cut corners, and we don’t list anything we wouldn’t use ourselves.
Straightforward, Honest Listings
You’ll never find vague or misleading information on our site. We provide verified specs, runtime hours, real photos, and detailed descriptions for every unit.
Responsive, Human Support
No phone menus or automated replies, just real people ready to answer your questions, walk through options, and help you make the best choice.
Fast Turnaround & Global Reach
From quote to shipping, we keep things moving. Whether you’re local or international, we can arrange delivery to your site quickly and safely.Get a Quote or Ask Our Experts
If you’re searching for natural gas engines for sale that are tested, trusted, and ready to work, NineX Power Systems is your go-to source.
At NineX Power Systems, we provide reliable Natural Gas Engines for Sale to support a wide range of industrial and commercial applications. Whether you’re upgrading existing equipment, replacing an aging engine, or installing a new power system, our team is committed to helping you find the right solution. We offer new, used, and professionally rebuilt Natural Gas Engines that deliver dependable performance, efficiency, and long-term value.
Our inventory includes Natural Gas Engines for Industrial operations from trusted OEMs manufacturers such as Caterpillar, Cummins, Waukesha, and PSI. Every engine is thoroughly inspected and tested to ensure it meets high standards for quality and reliability. With a variety of horsepower options available, we can help you select an engine that matches your specific operational requirements and budget. If you’re not sure which engine is right for your application, our experienced team is ready to assist every step of the way.
-

CAT G3512 SITA Engine Core
- $26,500.00
- Year : 1992
- Hours :
- Condition : Rebuildable Core
- Stock # : 1907
-

CAT G3512 SITA Engine Core
- $26,500.00
- Year : 1992
- Hours :
- Condition : Rebuildable Core
- Stock # : 1908
-

Used CAT G3412C Engine
- $35,000.00
- Year : 2008
- Hours :
- Condition : Running Take Out
- Stock # : 1793
-

Used CAT G3412C Engine
- $35,000.00
- Year : 2008
- Hours :
- Condition : Running Take Out
- Stock # : 1794
-

Used CAT G3412C Engine
- $35,000.00
- Year : 2008
- Hours :
- Condition : Running Take Out
- Stock # : 1795
-

Used CAT CG137-12 Engine
- Call for Pricing
- Year : 2014
- Hours : 22,304
- Condition : Good Used
- Stock # : 1925
-

Used CAT CG137-12 Engine
- Call for Pricing
- Year : 2014
- Hours : 26,184
- Condition : Good Used
- Stock # : 1926
-

Used CAT CG137-12 Engine
- Call for Pricing
- Year : 2014
- Hours : 32,217
- Condition : Good Used
- Stock # : 1927
-

New CAT CG137-12 Engine
- Call for Pricing
- Year : 2023
- Hours : 0
- Condition : New w/ Warranty
- Stock # : 1695
-

New CAT G3406TA Industrial Engine
- Call for Pricing
- Year : 2022
- Hours : 0
- Condition : New w/ Warranty
- Stock # : 1912
Top Benefits of Using Natural Gas Engines for Industrial Applications
With rising fuel costs and tighter emissions regulations, more industries are turning to natural gas engines as a smart, future-ready solution. They provide stable performance, fewer emissions, and often require less maintenance over time, making them a cost-effective choice for operations of all sizes.
Top Benefits:
- Lower operational fuel costs
- Reduced emissions and environmental impact
- Smoother, quieter engine operation
- Compatibility with CHP (combined heat & power) setups
- Better long-term return on investment compared to diesel
If you’re looking for consistent, scalable power with fewer headaches, natural gas might be exactly what your site needs.
Natural Gas Engines for Sale – What’s in Our Inventory?
Our inventory is built to meet a range of commercial and industrial needs. Whether you're powering equipment, driving mechanical systems, or generating electricity, we’ve got an engine that fits your application.
We offer:
- Used natural gas engines with verified low hours and full documentation
- Rebuilt units that meet performance specs like new
- HP range from 95 horsepower to over 3000+ HP
- Units with and without radiators, skids, or control systems
- Custom configurations depending on use case
Every listing is detailed and transparent, no surprises, just solid equipment ready to go.
Features That Set Our Natural Gas Engines Apart
Not all natural gas engines are built the same. At NineX, we focus on engines that deliver both performance and dependability. The units we list are designed for demanding conditions, long duty cycles, and cost-efficient operation.
Core Features:
- High thermal efficiency for reduced fuel consumption
- Cleaner combustion resulting in less engine wear
- Compatibility with emission-regulated zones and green energy initiatives
- Configurable mounting options for easy installation
- Proven performance in prime power and standby scenarios
Before anything gets added to our inventory, we test for compression, load response, emissions behavior, and overall operating condition.
Where Are Our Natural Gas Engines Used?
Our natural gas engines are found in a wide variety of environments, from remote oil sites to municipal infrastructure. Whatever your industry, if it requires reliable power, you’re in the right place.
Common Use Cases:
- Power generation facilities and utility grids
- Oil & gas fields and well sites
- Manufacturing plants and processing lines
- Commercial buildings, hospitals, and data centers
If you’re unsure whether a gas engine suits your setup, give us a call, and we’ll walk through your requirements and make it simple.
We Help You Choose the Right Unit
We know that buying an engine isn’t just a transaction; it’s a critical investment. That’s why our team works directly with you to match your specific needs with the right engine.
We’ll help you:
- Determine horsepower and load demands
- Navigate emissions standards and compliance issues
- Compare new vs. used options
- Understand integration into your existing system
Need a turnkey system or just the bare engine? We’ll guide you through it, start to finish.
Logistics & Global Shipping Support
We don’t stop at selling you the engine, we help you get it where it needs to go. Whether you're located in North America or abroad, our logistics team coordinates safe, secure, and timely delivery.
We assist with:
- Crating and export prep
- Ground and freight shipping
- Custom paperwork and documentation
- Port coordination and delivery tracking
From Houston to the Middle East, we’ve shipped engines to just about every corner of the globe.
Why Buy Your Natural Gas Engine from NineX Power Systems
When you work with us, you’re getting more than a product; you’re getting a team that understands what’s at stake when power is critical to your operations.
Here’s what sets us apart:
Industry Experience
We’ve worked with businesses across power generation, oil & gas, marine, and manufacturing, so we know what makes a reliable engine and how to match it to your specific application.
Tested, Verified Equipment
Every engine in our inventory goes through thorough inspection and performance testing. We don’t cut corners, and we don’t list anything we wouldn’t use ourselves.
Straightforward, Honest Listings
You’ll never find vague or misleading information on our site. We provide verified specs, runtime hours, real photos, and detailed descriptions for every unit.
Responsive, Human Support
No phone menus or automated replies, just real people ready to answer your questions, walk through options, and help you make the best choice.
Fast Turnaround & Global Reach
From quote to shipping, we keep things moving. Whether you’re local or international, we can arrange delivery to your site quickly and safely.Get a Quote or Ask Our Experts
If you’re searching for natural gas engines for sale that are tested, trusted, and ready to work, NineX Power Systems is your go-to source.
Frequently Asked Questions
What types of natural gas engines do you offer?
We offer a wide range of natural gas engines, including new, used, and professionally rebuilt units from leading manufacturers such as Caterpillar, Cummins, Waukesha, and PSI.
What industries commonly use natural gas engines?
Natural gas engines are widely used in power generation, oil and gas, manufacturing, agriculture, wastewater treatment, commercial facilities, and other industrial applications.
Are your natural gas engines tested before sale?
Yes. Every engine is thoroughly inspected and tested to verify its performance, reliability, and overall condition before it is made available for sale.
Do you offer natural gas engines for power generation projects?
Yes, we provide natural gas engines suitable for standby, prime, and continuous power generation applications for businesses throughout Houston, Texas, and beyond.
Can you help me choose the right natural gas engine?
Absolutely. Our experienced team can help you select the best engine based on your horsepower requirements, application, fuel availability, and budget.
Do you offer used and rebuilt natural gas engines?
Yes, we carry both used and rebuilt natural gas engines that provide a cost-effective alternative to purchasing a new engine while maintaining dependable performance.
What natural gas engine brands do you carry?
We supply engines from trusted manufacturers, including Caterpillar, Cummins, Waukesha, PSI, and other leading OEM brands known for quality and reliability.
Can you ship natural gas engines throughout Texas and the United States?
Yes, we can arrange shipping for natural gas engines across Houston, Texas, and locations throughout the United States, helping customers get the equipment they need quickly and efficiently.
How do I request a quote for a natural gas engine?
You can contact our team with your application requirements, preferred engine brand, and horsepower needs. We will recommend the most suitable engine and provide a competitive quote tailored to your project.