Used Diesel Fuel Generators & Natural Gas Fuel Generators for Sale
Diesel and natural gas fuel generators are industrial power generation systems designed to provide reliable electricity for primary, standby, or backup applications. These generators convert fuel into electrical energy to support critical operations in facilities where power continuity is essential. Used diesel fuel generators and natural gas fuel generators are widely used in manufacturing, oil and gas, healthcare, data centers, and commercial operations requiring dependable on-site power. Browse available inventory below to find generator systems that meet your power output and operational requirements.
Stock No.:
44430012Used MTU 1000 kW Diesel Generator | 3/60/480/277V | MTU 16V2000 Engine | Stamford CC634C Alternator | 17,596 Hours | Built 1999
Used- MTU Diesel Generator rated at 1000 kW, 3/60/480/277V. Built in 1999 with 17,596 hours. Package information: MTU w/ Stamford CC634C ser no. 34515D. Engine information: MTU 16V2000 ser no. 536200574.
MFR: MTU Onsite Energy
Stock No.:
53259002Used 1000 kW Cummins QST30-G5 Diesel Generator – Tier 2
Used- 1000 kW Cummins QST30-G5 Diesel Generator. EPA Tier 2. Sound-attenuated enclosure. Busbar M12. 2500 Amp Merlin Gerin Masterpact NW25 Micrologic 5.0 breaker. 340.3 gallon diesel base tank. 20 foot ISO container. 3phase/60hertz/277/480volt. 342 hours. 1505 Amps.1800 RPM. Year 2011.
MFR: Cummins
Stock No.:
53259003Used Cummins QST30-G5 1000kW Diesel Generator – Tier 2, Industrial Power
Used- Cummins 1000 kW Model QST30-G5 Diesel Generator. EPA Tier 2. Sound-attenuated enclosure. Busbar M12. 2500 Amp Merlin Gerin Masterpact NW25 Micrologic 5.0 breaker. 340.3 gallon diesel base tank. 20 foot ISO container. 3phase / 60hertz / 277/480 volt. 1505 Amps. 1800 RPM. Year 2011. 370 Hours.
MFR: Cummins
Stock No.:
44430016Used Generac 1MW Open Skid Generator | 1130 kW Mitsubishi Diesel Standby Power Unit
Used- Generac 1MW Open Skid Generator, Model 575RSL4044. Rated for stand-by duty. Rated at 1130 kW, 277/480 volts (re-connectable), 1699 amps. 1600 amp breaker (adjustable). Driven by a 1449hp Mitsubishi S12H-PTA engine, Serial# 30119. 312.5 original hours. Serial# WA522385-1299, Built 1999.
MFR: Generac
Stock No.:
49317047Used Cummins DQGAB 1500 kW Diesel Generator – Tier 2, PMG, Sound Enclosure, UL2085 Fuel Tank
Used-1500 kW standby (1350 kW prime) Cummins diesel generator set model DQGAB, SN-G110233080. Cummins QSK50-G4 engine rated 2220 HP at 1800 RPM, SN-25366503, EPA Tier 2 emissions. 3/60/277/480V, 12 lead reconnectable to other voltages. 2500 Amp main-line circuit breaker. PMG - Permanent magnet generator. Oversized generator end rated 1612 kW. UL 2200 listed package. Engine cooling high ambient air temperature. PowerCommand digital control panel. Battery charger. Coolant heater. Sound attenuated enclosure. 5181 gallon UL2085 listed sub-base fuel tank with secondary containment. 770 Hrs. Year 2011. Passed load test 1/3/2025. Overall dimensions enclosure with genset 150W x 397L x 153H, 51,000 lbs, fuel tank 144W x 397L x 37H 25,389 lbs.
MFR: Cummins
Stock No.:
54207001Unused Cummins Diesel Generator Set, Model C1500D6E | 1500 kW Standby / 1364 kW Prime | QSK38-G18 Engine | 60 Hz / 480V | Tier 2 | 2460-Gallon Fuel Tank | 2025 Build
Unused Cummins Diesel Generator Set, Model C1500D6E. Rated 1500kW standby, 1364 kW prime. Model QSK38-G18 engine. 60hz/480V. EPA Tier 2 compliant. Built 2025. With enclosure and 2460 gallon fuel tank.
MFR: Cummins
Stock No.:
53868001Used Cummins C1540 N6C Natural Gas Generator Set – 1540 kW, QSV91G Engine, Low BTU Gas Capable, 60 Hours
Used- Cummins Generator Set, Model C1540 N6C. Rated 1540kW; 480 Volt, Driven by a Cummins Model QSV91G 91-liter natural gas engine with a low BTU system mounted on it; Has cooler, breakers, and controllers. Engine suitable for both pipeline and landfill gas. Serial# F15K840326. Built 2015. Unit has 60 test hours.
MFR: Cummins
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44430015Used Kohler 180 kW Natural Gas Generator | Detroit Diesel Series 50 Engine | 352 Hours | Model 180RZDB | Built 2000
Used- Kohler Natural Gas Generator, rated at 180 kW, built in 2000 with 352 hours. Package information: Kohler 180RZDB ser no. 2066339. Engine information: Detroit Diesel 50-Series ser no. 04R0047875.
MFR: Kohler
Stock No.:
44430017Unused Generac 2000 kW Diesel Generator | Mitsubishi S16R Engine 480V Industrial Power Unit
Unused- Generac Generator, Model SD20000KG02654D18APYY2. Rated 2000 kW. Serial# 3016245459. 480 volts. Mitsubishi engine, model S16R-Y2PTAW2-1, Serial# 28089. Built 2024. 2 hours (load bank testing).
MFR: Generac
Stock No.:
53555002Cummins Standby Natural Gas Generator, Model 235GFBC
Used Cummins Standby Natural Gas Generator, Model 235GFBC, rated at 235 kW and housed in a weather-protective enclosure. This generator is powered by a Cummins GTA855G3 natural gas engine, serial number 25303054, producing approximately 354 hp. Unit is configured for 3 phase, 60 Hz, 480 V operation at 1800 RPM and was built in 2005. The generator currently shows approximately 920 operating hours, making it a low-hour standby power unit well suited for dependable backup power applications.
MFR: Cummins
Stock No.:
54265001Unused Wildcat 25 kW Natural Gas/Propane Generator | Model BS0025LPAO | Kubota WG1605 Engine | Built 2022
Unused Wildcat 25 kW Natural Gas/Propane Generator | Model BS0025LPAO | Kubota WG1605 Engine | Built 2022. Rated 25kW. 42.5kW (approx. 56 HP) at 3600 RPM. Meccalte model ECP28 L4 alternator. On casters. OAD: 60" x 30" W x 52" H.
Diesel and Natural Gas Generator Applications & Typical Use Cases
Used generators are deployed across industries where consistent and reliable power is required. Typical applications include:
Backup power for manufacturing plants and processing facilities
Prime power generation in remote or off-grid locations
Emergency power supply for hospitals, data centers, and critical infrastructure
Supporting oil and gas operations and field equipment
Providing temporary power for construction sites and industrial projects
When to Choose Diesel vs. Natural Gas Generators
The choice between diesel and natural gas generators depends on fuel availability, runtime requirements, and operational priorities. Diesel generators are often selected for their high power density, durability, and ability to handle variable loads. Natural gas generators are preferred in facilities with existing gas infrastructure, offering cleaner emissions and continuous fuel supply without the need for on-site storage.
Used Generator Buying Considerations
When evaluating a used diesel or natural gas generator, consider the following:
Power Rating (kW/kVA): Ensure output capacity matches load requirements
Fuel Type & Availability: Diesel vs. natural gas based on site infrastructure
Run Hours & Maintenance History: Indicator of wear and remaining service life
Voltage & Frequency Requirements: Compatibility with facility systems
Enclosure & Mobility: Skid-mounted, trailer-mounted, or enclosed units
Control Systems & Compliance: Monitoring capabilities and emissions requirements
Why Buy Used Diesel and Natural Gas Generators
Used generators provide a practical way to secure power generation capacity without the lead times associated with new units. Many systems are maintained as backup equipment and may have relatively low run hours. For facilities preparing for outages, expanding operations, or adding redundancy, used generators offer a dependable and cost-conscious solution.
Sell Your Used Diesel Fuel and Natural Gas Generators
If you are rotating out backup units or downsizing power capacity, Aaron Equipment can help reposition surplus generators within active resale channels. We work with sellers to evaluate equipment and connect it with buyers seeking reliable power systems for industrial and commercial use.
A diesel or natural gas generator is a power generation system that converts fuel into electricity using an internal combustion engine. These generators are used for backup, standby, or primary power in industrial and commercial applications.
They are used to provide reliable power for facilities during outages, in remote locations, or as part of continuous operations. Common applications include manufacturing, healthcare, data centers, and energy production environments.
Diesel generators typically offer higher power density and are well-suited for backup or variable load applications. Natural gas generators provide cleaner emissions and are often used where a continuous fuel supply is available through existing gas infrastructure.
Costs vary based on power rating, fuel type, run hours, manufacturer, and overall condition. Higher-capacity or low-hour units generally carry greater value, especially when configured for industrial or critical power applications.
Yes. Aaron Equipment purchases used diesel and natural gas generators. Our team can review system details and help facilitate resale or direct purchase opportunities.