Portable Generators for Sale
Generator Source stocks a wide array of portable diesel generators, from compact 20kW-750kW towable units up to multi-megawatt mobile power modules. Many models feature highway-legal trailers, complete with lighting and brakes, for safe transport.
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Extensive Inventory of Portable Generators
Range of Options
In-stock inventory from 20kW to 4000kW
Fuel Types
Diesel and natural gas fuel options
Mobile Power
Trailer-mounted and towable configurations
Flexible Applications
Multi-voltage, sound-attenuated, and weatherproof designs
Warranties
Factory warranties (new units) and Generator Source certification (used units)
Fast Shipping
Fast nationwide shipping and field-ready delivery
New portable generators
Used portable generators
What are portable generators?
Portable generators are typically towable or trailer-mounted, making them easy to transport between job sites or events. These self-contained units often feature onboard fuel tanks and sound-attenuated enclosures, allowing for quiet and extended operation in the field. Portable and mobile gensets are ideal for a wide range of applications across various industries. They can serve as primary power sources in remote locations or provide critical backup during outages. While diesel models dominate the portable generator market, we also offer natural gas portable generators and even dual-fuel units for specialized applications. Natural gas is a cleaner-burning fuel with lower emissions of sulfur, nitrogen, and soot compared to diesel, making NG generators desirable for sites with strict environmental or air quality requirements. If your location has a reliable natural gas supply (such as a pipeline connection), a portable NG generator can provide continuous power without the need for refueling. Whether diesel or natural gas, every portable generator we sell is rigorously tested and verified to meet our performance standards. We carry top brands known for quality in mobile gensets, including Caterpillar, Cummins, Kohler, Generac, Hipower and many others. Each unit comes ready to run, and our team can assist with any necessary setup to get your mobile diesel or NG generator on line quickly.
New & Used Portable Generators
Generator Source offers a wide selection of new and used portable generators ranging from 20kW to 4000kW, giving you flexibility in both performance and price. Whether you’re looking for a brand-new generator with zero hours or a field-tested used unit, we have options in stock and ready to ship. Our inventory includes diesel and natural gas trailer-mounted generators from top manufacturers like Caterpillar, Cummins, Kohler, Generac, and Hipower.
All of our new portable generators feature modern engine technology, digital control panels, and are built to meet EPA emissions standards, including Tier 4 Final on select models. These units are ideal for clients seeking the latest features, maximum lifespan, and manufacturer-backed warranties. Many include quiet enclosures, highway-legal trailers, and multi-voltage outputs for on-the-go versatility.
For those seeking cost-effective power, our used portable generators deliver reliable performance at a significantly lower price point. Each used unit undergoes our comprehensive 31-point inspection, is load bank tested, and reconditioned as needed to meet our performance standards. We specialize in low-hour units from rental fleets and standby installations, offering proven reliability at 30–70% less than the cost of new.
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Need help finding a portable generator?
Choosing the right portable generator depends on several key factors – including fuel type, capacity, mobility needs, and runtime. Whether you’re powering a remote job site, planning for an event, or preparing for emergency outages, our team is here to help you find the best-fit solution. Generator Source offers expert guidance across portable diesel and natural gas generators ranging from 20kW to 4000kW, with both trailer-mounted and containerized mobile options in stock.
Featured Brands Offered/Serviced
Industries that rely on portable generators
Construction & Contracting
Portable diesel generators are essential on construction sites without access to utility power. They supply electricity for heavy machinery, job trailers, welding equipment, lighting towers, and tools. Our trailer-mounted units allow contractors to easily transport power from one job to the next.
Event & Entertainment
Concerts, festivals, outdoor expos, and sporting events all depend on quiet, dependable portable power. Sound-attenuated generators supply clean energy for audio/visual systems, lighting, vendor booths, and food trucks. Our units are ideal for both temporary power grids and behind-the-scenes operations.
Oil, Gas, & Mining
Remote energy operations often lack grid access. Portable generators deliver prime or backup power for drilling rigs, pump stations, field offices, and processing equipment. Our skid- or trailer-mounted gensets are designed to perform in rugged conditions and harsh environments.
Disaster Recovery & Emergency Relief
In hurricanes, wildfires, floods, or outages, emergency teams rely on portable generators to power shelters, command centers, refrigeration, and medical services. We offer rapid-deployment mobile units to support local governments, utilities, and disaster response agencies when the grid goes down.
Utilities & Maintenance Operations
Power companies and service contractors use portable gensets during planned maintenance or infrastructure upgrades. Mobile generators keep systems energized while crews work on substations, lines, and telecom towers. We supply voltage-matching units ready for grid-parallel or backup applications.
Agriculture & Irrigation
Farms, dairies, and greenhouses use mobile generators to run irrigation pumps, climate control systems, lighting, and equipment during seasonal needs or power disruptions. Our portable units give agricultural operations flexible power options when and where they need it.
Understanding Portable Power Needs
What size portable generator do I need?
The right size depends on the total wattage of the equipment you plan to power. Start by identifying your critical load – lights, tools, HVAC, pumps, or systems that must stay running. Then factor in starting watts for any motors or compressors. Our sales team can help you calculate your load requirements and recommend the correct portable generator size, whether it’s 50kW, 200kW, or 1000kW+.
What’s the difference between a portable generator and a standby generator?
Portable generators are trailer-mounted or mobile units designed to be relocated as needed. They are commonly used for temporary power at job sites, events, and emergency situations. Standby generators, on the other hand, are permanently installed and automatically engage during a power outage. Portable generators offer greater flexibility, while standby systems provide automatic response and integration with building systems.
Do you offer diesel and natural gas portable generators?
Yes. Generator Source carries a full range of portable diesel generators, which are preferred for their durability, long runtime, and easy onsite fuel storage. We also offer natural gas portable generators in select capacities, which are cleaner burning and ideal for locations with pipeline access or strict emissions requirements.
What types of industries use portable generators?
Portable generators are widely used in construction, events, utilities, disaster recovery, agriculture, and industrial applications. Any situation that requires reliable power away from a permanent installation can benefit from a mobile generator. We serve contractors, emergency managers, municipalities, and more.
What’s the difference between new and used portable generators?
New portable generators come with zero hours, the latest features, and manufacturer warranties. Used portable generators offer significant cost savings and are typically low-hour units from rental fleets or backup applications. All of our used generators undergo a full inspection, load bank test, and certification before sale.
Are your portable generators ready to ship?
Yes. We keep a large inventory of in-stock portable generators ranging from 20kW to 4000kW. Many units are ready for immediate shipment nationwide. Our team can coordinate fast delivery, whether you’re responding to an emergency or planning a project deadline.
Do you service what you sell?
Absolutely. Generator Source provides full in-house and field generator support, including preventative maintenance, diagnostics, repairs, and replacement parts. Our technicians are EGSA-certified and experienced with all major brands. We back every unit with service you can count on before and after the sale.
Our Values
Our mission is to provide reliable power solutions that empower businesses across industries, ensuring seamless operations with unmatched expertise and quality.
Since our founding over four decades ago, Generator Source has grown to become the country’s largest buyer and seller of commercial generators, with branches and service teams ready to deliver power solutions nationwide.
People First
We prioritize relationships, building trust and respect in every customer and team interaction.
Quality of work
We hold ourselves to the highest standards, delivering reliable power solutions backed by rigorous testing.
Dedication
We go the extra mile to support our customers and stand behind every generator we service and sell.
Expertise
With 50 years of industry experience, our team brings unmatched knowledge to every project.
Why Choose Generator Source?
- Over 50 years of generator system experience
- Extensive inventory of new and used generators
- Diesel and natural gas options in stock
- Field service teams in Colorado, Florida, and Texas
- EGSA-certified technicians and nationwide shipping
- Load tested, inspected, and ready-to-run inventory
In-Shop and Field Generator Support
When you purchase a portable generator from Generator Source, you’re backed by a nationwide support team with decades of power generation experience. Whether your unit is in the field, in transit, or at a job site, we provide comprehensive generator services to keep your portable system operating at peak performance.
Our mobile field technicians can be dispatched directly to your location for diagnostics, maintenance, and repairs. We specialize in trailer-mounted and mobile power systems, including diesel and natural gas units across the 20kW to 4000kW range. From minor tune-ups to full system troubleshooting, our team works quickly to minimize downtime and get your generator back online.
Quality Assurance Guaranteed
Certified 31-Point Inspection
Our inventory features both brand-new models and quality-tested used generators. We stock new, used, and surplus industrial generators, giving you flexible options to meet your power needs cost-effectively. Each pre-owned unit undergoes rigorous refurbishment and a multi-point inspection to ensure it performs to specification. We support multiple fuel types in this range, including diesel-powered sets known for their durability and natural gas generators favored for cleaner emissions.