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.:
54543001Used Generac MG0300 300 kW Natural Gas Generator – 277/480V Enclosed Genset with
Used 2012 Generac natural gas generator, model MG0300, rated at 300 kW. Unit is powered by an enclosed OH0924 engine and has 160 reported operating hours. Generator is configured for 3-phase, 60 Hz, 277/480V electrical service and includes a weather enclosure, Eaton inline 630 amp breaker, and coolant heater. Serial number 2114542. Possible applications and suitable uses include standby or backup power for industrial facilities, manufacturing plants, warehouses, commercial buildings, and other operations requiring 300 kW, 277/480V 3-phase power. OAD 174" X 57" X 75"T, 8,300 LBS.
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.:
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.:
54551001Used 2020 Caterpillar D3506C 350 kW Diesel Generator Set
Used 2020 Caterpillar 350 kW diesel generator set, model D3506C, powered by a CAT C13 diesel engine, serial number PW30188. Generator operates at 1800 RPM and is rated for 3-phase, 60 Hz, 480V electrical service. Unit has 779 operating hours and is equipped with a weather enclosure and sub-base fuel tank. Possible applications and suitable uses include standby or backup electrical power for industrial plants, manufacturing facilities, warehouses, commercial buildings, and other 480V 3-phase operations. Built 2020.
MFR: Caterpillar
Stock No.:
54432001Used Olympian G60F3 Natural Gas Generator – 60 kW Standby Power Generator with Weather Enclosure (Low Hours)
Used- Olympian Natural Gas Generator, Model G60F3. Rated standby power 60 kW, 75 kVA. Weather enclosure. Engine operates at 1,800 RPM. 3/60/120/208V. 163.2 Hours run. Serial# OLY00000JNGD01498, built 2008.
MFR: Olympian
Stock No.:
49317033Used MTU 600 kW Standby (550 kW prime) Diesel Generator Set - Model DS600
Used- MTU 600 kW Standby (550 kW prime) Diesel Generator Set, Model DS600, SN-321178-1-1-0510. MTU 12V1600G80S engine rated 896 HP at 1800 RPM, SN-16701001344, EPA Tier 2 emissions. 3/60/120/208V, 12 lead reconnectable to other voltages. 2000 Amp adjustable main-line circuit breaker. PMG permanent magnet generator. Engine cooling radiator rated 50C/122F ambient. UL listed stationary engine generator assembly. Basler DGC-2020 digital control panel. Battery charger. Coolant heater. Weather enclosure. 1000 gallon sub-base fuel tank with secondary containment. 293 Hrs. Year 2010. 86W x 170L x 144H, 20,000 lbs. Passed load test 6/11/2024.
MFR: MTU Onsite Energy
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.