Used Generators for Sale
Used generators are industrial power systems designed to produce electricity for continuous operation, backup power, or on-site energy generation. These systems are widely used across manufacturing, energy, chemical processing, and utilities where reliable power supply is critical. Generators support operations ranging from emergency backup to full-scale power generation in remote or grid-independent environments. Aaron Equipment offers used generators for sale in a variety of configurations, fuel types, and capacities to meet specific power requirements and operational demands. Browse available inventory below or explore generator types to find equipment aligned with your application.
Stock No.:
50477001Unused- Caterpillar Cogeneration Natural Gas Generator System, 1.5 MW.
Unused- Caterpillar Cogeneration Natural Gas Generator System, 1.5 MW, Permanent. Caterpillar Model CG170-16 Natural Gas Engine Rated at 1556 kW, 4160 V, 3 Phase, 60 Hz at 0.8 Power Factor. Pritchard Brown Enclosure, Cannon Boiler, Boulden Radiator, WHR System, Stueler SCR System to be Installed Outside of the Enclosure, Caterpillar ISO Auxiliary Cabinet. Built 2017.80 hours of Engineering Support to site at customers location. U.S.A. locations only.
MFR: Caterpillar
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.:
53459019Used Siemens STC-SV (08-8)-B Two-Stage Centrifugal Gas Compressors – 1479 kW, 12,327 m³/h, 9 Bar Max
Used Siemens STC-SV (08-8)-B Two-Stage Centrifugal Gas Compressors 1479 kW, 12,327 m/h, 9 Bar Max. Rated power 1479 KW. Rated capacity 12,327 m3/hour. 0.2 barg inlet pressure. 3.7 discharge pressure 9 bar (135 PSI) maximum allowable discharge pressure. Driven via a Flender TX45/6C1gearbox by an 1800kW motor, gas filter, lube oil system, acoustic enclosure, air circulation electric fans, Frame mounted. Complete with controls and additional infrastructure. New year 2014. Our freight specialists can assist you with door to door transportation and all customs documents needed to make the process go as smoothly as possible.
Stock No.:
53459020Siemens STC-SV Two-Stage Gas Compressor Skid – 1479 kW, 9 Bar Rated
Siemens STC-SV Two-Stage Gas Compressor Skid 1479 kW, 9 Bar Rated. Rated power 1479 KW. Rated capacity 12,327 m3/hour. 0.2 barg inlet pressure. 3.7 discharge pressure 9 bar (135 PSI) maximum allowable discharge pressure. Driven via a Flender TX45/6C1gearbox by an 1800kW motor, gas filter, lube oil system, acoustic enclosure, air circulation electric fans, Frame mounted. Complete with controls and additional infrastructure. New year 2014. Our freight specialists can assist you with door to door transportation and all customs documents needed to make the process go as smoothly as possible.
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
Stock No.:
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
Types of Used Generators Available
Aaron Equipment offers a range of used generators designed to support power generation, backup power, and energy recovery applications:
Cogeneration Plants – Combined heat and power (CHP) systems that generate electricity while capturing and utilizing waste heat for increased efficiency.
Diesel Fuel & Natural Gas Fuel Generators – Versatile generators powered by diesel or natural gas, commonly used for standby, prime, or continuous power applications.
Steam Turbine Generators – Systems that convert steam energy into electrical power, typically used in large-scale industrial and utility operations.
Gas Turbine Generators – High-capacity generators that use combustion turbines for efficient power generation in industrial and energy sectors.
Miscellaneous Generators – Various generator systems and configurations designed to support specialized or unique power generation applications.
Generator Applications & Industry Uses
Used generators are essential across industries where reliable electrical power is required for operations, backup, or energy independence. Common applications include:
Manufacturing Facilities: Backup and primary power supply for continuous production
Chemical Processing: Power generation for critical processing systems and utilities
Energy & Utilities: On-site and distributed power generation systems
Oil & Gas: Remote power supply for drilling and processing operations
Data Centers & Infrastructure: Emergency backup power to maintain uptime
These systems help ensure operational continuity, reduce downtime, and provide energy flexibility across industrial environments.
Used Generator Buying Considerations
When selecting a used generator, it is important to evaluate both power requirements and equipment condition:
Power Output (kW/MW): Match generator capacity to load requirements
Fuel Type: Diesel, natural gas, or turbine-based depending on availability and cost
Duty Cycle: Standby, prime, or continuous operation requirements
Efficiency & Emissions: Evaluate fuel consumption and regulatory compliance
Control Systems: Assess automation, monitoring, and integration capabilities
Condition & Maintenance History: Review service records and operational hours
Why Buy Used Generators
Buying used generators provides a cost-effective solution for securing reliable power without the long lead times of new systems. Used generators offer proven performance and are often available for immediate deployment, helping facilities maintain uptime and reduce capital investment.
Aaron Equipment sources high-quality generator systems from leading manufacturers, providing dependable power solutions for a wide range of industrial applications.
Sell Your Used Generators
Aaron Equipment actively purchases surplus generators, including diesel, gas turbine, and cogeneration systems. Whether upgrading equipment or decommissioning assets, our team can help maximize value.
An industrial generator is a system that converts mechanical energy into electrical power. It is used to supply electricity for industrial operations, either as a primary power source or backup system.
Common types include diesel generators, natural gas generators, steam turbine generators, gas turbine generators, and cogeneration systems. Each type is suited for different power capacities and applications.
Choosing the right generator depends on required power output, fuel availability, operating conditions, and whether the system will be used for standby or continuous operation.
Yes. Used generators are built for long service life and can remain highly reliable when properly maintained, inspected, and tested prior to purchase.
Generators are used in manufacturing, chemical processing, energy production, oil and gas, and infrastructure sectors where reliable power is essential.