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.:
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.
Stock No.:
40958029Used Onan 250 kW Natural Gas Generator | Model 250GEBC | Cummins G1A855G3 Engine | 480V | 570 Hours (2005)
Used- Onan 250kW Generator Model #: 250GEBC RPM: 1800 Year: 2005 Engine # 25302574 Engine Model# G1A855G3 Phase: 3 Volts: 480 HZ: 60 Hours: 570 Natural Gas. Built in 2005, this generator operates at 1800 RPM and supports a three-phase electrical system. It delivers a voltage output of 480 volts at a frequency of 60 Hz, making it suitable for various heavy-duty tasks and ensuring efficient energy distribution across demanding environments. Driven by a Cummins Engine, Model G1A855G3, Serial# 25302574.
MFR: Onan
Stock No.:
54380001Blue Star VD300-01 300 kW Diesel Generator – 480/277V Standby Power Unit
Used Blue Star Power Systems / Volvo 300 kW Standby (275 kW prime) Diesel Generator Set, Model VD300-1, SN-103448-1-1. Volvo Penta TAD1351GE engine rated 456 HP at 1800 RPM, SN-2013746570, EPA Tier 3 emissions. 3/60/277/480V, 12 lead reconnectable to other voltages. 400 Amp main-line circuit breaker. PMG - permanent magnet generator. UL listed stationary engine generator assembly. Basler DGC - 2020 digital control panel. Coolant heater. Weather enclosure. UL listed sub-base fuel tank with secondary containment. 121.4 Hrs. Yr 2018.
MFR: Blue Star Power Systems
Stock No.:
54543001Used Generac MG0300 300 kW Natural Gas Generator – 277/480V Enclosed Genset with 160 Reported Hours
Used Generac Natural Gas Generator, Model MG0300. 300 KW. Enclosed OH0924 Engine. Weather Enclosure. Eaton Inline 630 Amp Breaker. Coolant Heater. Built 2012. 3/60/277/480V. 160 hours Reported. Serial# 2114542.
MFR: Generac
Stock No.:
51825001Onan 35 kW Natural Gas Generator Set: Reliable Standby Power Solution
Used- Cummins / Onan 35 kW Standby Natural Gas Generator Set, Model 35SJB, SN-L900363017. Chrysler model H135 engine, SN-K1142033, 3600rpm. Rated 35 kW, 3/60/277/480V 12 lead reconnectable to other voltages.. 60 Amp main-line circuit breaker. Hours 403. No enclosure.
MFR: Cummins/Onan
Stock No.:
44430014Used Cummins 350 kW Diesel Generator | Only 17 Hours | DFCC Package | NTA855G3 Engine | Built 1999
Used- Cummins Diesel Generator rated at 350 kW, built in 1999 with 17 hours. Package information: Cummins DFCC-3387631 ser no. A000055536. Engine information: Cummins NTA855G3 ser no. 30363796.
MFR: Cummins
Stock No.:
54292001Buy Used Generac 350kW Standby Generator – 800A Breaker, Only 277 Hours
Used Generac 350 kW Standby Diesel Generator Set, Model SD0350-G36160D18GPSY, Mitsubishi 16L engine rated at 1800 RPM, Serial# 0A8829. Unit configured for 3/60/120/208V, 12 lead reconnectable to other voltages. 800 Amp main-line circuit breaker. Generac digital control panel. 24 Volt DC Battery Charger. Sound attenuated enclosure. 706 gallon UL listed sub-base fuel tank with secondary containment. 277 Hours. Serial# 2089404, Built 2006. Overall dimensions 200"L x 58"W x 118"T.
MFR: Generac
Stock No.:
54386001Used Generac SD350 Diesel Generator – 350 kW / 438 kVA with 2,000 Gallon Base Tank, Only 275 Hours
Used- Generac Diesel Generator, Model SD350. Rated 350kW, 438KVA. Weather Enclosure. Iveco/FPT engine power: 530 HP @1,800 RPM. 3/60/277/480V. Includes 2,000 gallon base tank. 275.4 hours, Serial# 7855510, Built 2013. Includes Square D Company 500 kVa transformer for 120V usage.
MFR: Generac
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.