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.:
54541004Industrial MTU Rolls-Royce 900 kW Diesel Generator for Mission-Critical Standby Power
Unused- Industrial MTU Rolls-Royce 900 kW Diesel Generator for Mission-Critical Standby Power. Rated 900 kW/1125 kV. MTU 22.4L Diesel Engine, 1800 RPM, EPA Tier 2 Certified for Emergency Standby. Permanent Magnet Generator Alternator with Digital Voltage Regulator & Generator Strip Heater. Sound Level 3 Enclosure with Vertical Air Discharge, Steel Construction, 130 MPH Wind Load Rated, 74.9 dBA, Space Heater, Motorized Intake Louvers. Internally Mounted Silencer within Enclosure, Critical Grade. MGC-3050 Digital Control Panel, Mounted Left Side, Paralleling Capabilities. ModBus TCP/IP Communications. Remote Mounted Annunciator, Meets NFPA 110 Level 1. Remote Mounted Emergency Stop, Break Glass Station, Nema 3R For Outdoor Installation. 1200 Amp Breaker, 3-Pole, 100% Rated with Electronic LSI Trip, Mounted Right Side, Motor Operated Block. 5000W, 1ph, 208V Heater. 10 Amp, 24VDC / 120VAC 1ph Battery Charger. NFPA-110 Level 1 Compliance, UL2200 Listed Fuel Tank: 1515 Gallon, 24 Hour Run Time at Full Load, UL 142 Listed. Built 2024.
MFR: MTU Onsite Energy
Stock No.:
54541005MTU DS900 900 kW Industrial Backup Generator with 24-Hour Fuel Tank – Built 2024
Unused- MTU DS900 900 kW Industrial Backup Generator with 24-Hour Fuel Tank - Built 2024. Rated 900 kW/1125 kV. MTU 22.4L Diesel Engine, 1800 RPM, EPA Tier 2 Certified for Emergency Standby. Permanent Magnet Generator Alternator with Digital Voltage Regulator & Generator Strip Heater. Sound Level 3 Enclosure with Vertical Air Discharge, Steel Construction, 130 MPH Wind Load Rated, 74.9 dBA, Space Heater, Motorized Intake Louvers. Internally Mounted Silencer within Enclosure, Critical Grade. MGC-3050 Digital Control Panel, Mounted Left Side, Paralleling Capabilities. ModBus TCP/IP Communications. Remote Mounted Annunciator, Meets NFPA 110 Level 1. Remote Mounted Emergency Stop, Break Glass Station, Nema 3R For Outdoor Installation. 1200 Amp Breaker, 3-Pole, 100% Rated with Electronic LSI Trip, Mounted Right Side, Motor Operated Block. 5000W, 1ph, 208V Heater. 10 Amp, 24VDC / 120VAC 1ph Battery Charger. NFPA-110 Level 1 Compliance, UL2200 Listed Fuel Tank: 1515 Gallon, 24 Hour Run Time at Full Load, UL 142 Listed. Built 2024.
MFR: MTU Onsite Energy
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54541006Unused 900 kW MTU Diesel Generator with Sound Attenuated Enclosure & Digital Controls
Unused 900 kW MTU Diesel Generator with Sound Attenuated Enclosure & Digital Controls. Rated 900 kW/1125 kV. MTU 22.4L Diesel Engine, 1800 RPM, EPA Tier 2 Certified for Emergency Standby. Permanent Magnet Generator Alternator with Digital Voltage Regulator & Generator Strip Heater. Sound Level 3 Enclosure with Vertical Air Discharge, Steel Construction, 130 MPH Wind Load Rated, 74.9 dBA, Space Heater, Motorized Intake Louvers. Internally Mounted Silencer within Enclosure, Critical Grade. MGC-3050 Digital Control Panel, Mounted Left Side, Paralleling Capabilities. ModBus TCP/IP Communications. Remote Mounted Annunciator, Meets NFPA 110 Level 1. Remote Mounted Emergency Stop, Break Glass Station, Nema 3R For Outdoor Installation. 1200 Amp Breaker, 3-Pole, 100% Rated with Electronic LSI Trip, Mounted Right Side, Motor Operated Block. 5000W, 1ph, 208V Heater. 10 Amp, 24VDC / 120VAC 1ph Battery Charger. NFPA-110 Level 1 Compliance, UL2200 Listed Fuel Tank: 1515 Gallon, 24 Hour Run Time at Full Load, UL 142 Listed. Built 2024.
MFR: MTU Onsite Energy
Stock No.:
54541007MTU Rolls-Royce 900 kW Standby Generator – Tier 2 Diesel Engine – Unused 2024
MTU Rolls-Royce 900 kW Standby Generator Tier 2 Diesel Engine Unused 2024. Rated 900 kW/1125 kV. MTU 22.4L Diesel Engine, 1800 RPM, EPA Tier 2 Certified for Emergency Standby. Permanent Magnet Generator Alternator with Digital Voltage Regulator & Generator Strip Heater. Sound Level 3 Enclosure with Vertical Air Discharge, Steel Construction, 130 MPH Wind Load Rated, 74.9 dBA, Space Heater, Motorized Intake Louvers. Internally Mounted Silencer within Enclosure, Critical Grade. MGC-3050 Digital Control Panel, Mounted Left Side, Paralleling Capabilities. ModBus TCP/IP Communications. Remote Mounted Annunciator, Meets NFPA 110 Level 1. Remote Mounted Emergency Stop, Break Glass Station, Nema 3R For Outdoor Installation. 1200 Amp Breaker, 3-Pole, 100% Rated with Electronic LSI Trip, Mounted Right Side, Motor Operated Block. 5000W, 1ph, 208V Heater. 10 Amp, 24VDC / 120VAC 1ph Battery Charger. NFPA-110 Level 1 Compliance, UL2200 Listed Fuel Tank: 1515 Gallon, 24 Hour Run Time at Full Load, UL 142 Listed. Built 2024.
MFR: MTU Onsite Energy
Stock No.:
545410082024 MTU Rolls-Royce DS900 900 kW Diesel Generator Set – UL2200 Listed & NFPA 110 Level 1
Unused- 2024 MTU Rolls-Royce DS900 900 kW Diesel Generator Set UL2200 Listed & NFPA 110 Level 1. Rated 900 kW/1125 kV. MTU 22.4L Diesel Engine, 1800 RPM, EPA Tier 2 Certified for Emergency Standby. Permanent Magnet Generator Alternator with Digital Voltage Regulator & Generator Strip Heater. Sound Level 3 Enclosure with Vertical Air Discharge, Steel Construction, 130 MPH Wind Load Rated, 74.9 dBA, Space Heater, Motorized Intake Louvers. Internally Mounted Silencer within Enclosure, Critical Grade. MGC-3050 Digital Control Panel, Mounted Left Side, Paralleling Capabilities. ModBus TCP/IP Communications. Remote Mounted Annunciator, Meets NFPA 110 Level 1. Remote Mounted Emergency Stop, Break Glass Station, Nema 3R For Outdoor Installation. 1200 Amp Breaker, 3-Pole, 100% Rated with Electronic LSI Trip, Mounted Right Side, Motor Operated Block. 5000W, 1ph, 208V Heater. 10 Amp, 24VDC / 120VAC 1ph Battery Charger. NFPA-110 Level 1 Compliance, UL2200 Listed Fuel Tank: 1515 Gallon, 24 Hour Run Time at Full Load, UL 142 Listed. Built 2024.
MFR: MTU Onsite Energy
Stock No.:
54541009Unused MTU Rolls-Royce DS900 900 kW Emergency Standby Diesel Generator with 1,515 Gallon Fuel Tank
Unused MTU Rolls-Royce DS900 900 kW Emergency Standby Diesel Generator with 1,515 Gallon Fuel Tank. Rated 900 kW/1125 kV. MTU 22.4L Diesel Engine, 1800 RPM, EPA Tier 2 Certified for Emergency Standby. Permanent Magnet Generator Alternator with Digital Voltage Regulator & Generator Strip Heater. Sound Level 3 Enclosure with Vertical Air Discharge, Steel Construction, 130 MPH Wind Load Rated, 74.9 dBA, Space Heater, Motorized Intake Louvers. Internally Mounted Silencer within Enclosure, Critical Grade. MGC-3050 Digital Control Panel, Mounted Left Side, Paralleling Capabilities. ModBus TCP/IP Communications. Remote Mounted Annunciator, Meets NFPA 110 Level 1. Remote Mounted Emergency Stop, Break Glass Station, Nema 3R For Outdoor Installation. 1200 Amp Breaker, 3-Pole, 100% Rated with Electronic LSI Trip, Mounted Right Side, Motor Operated Block. 5000W, 1ph, 208V Heater. 10 Amp, 24VDC / 120VAC 1ph Battery Charger. NFPA-110 Level 1 Compliance, UL2200 Listed Fuel Tank: 1515 Gallon, 24 Hour Run Time at Full Load, UL 142 Listed. Built 2024.
MFR: MTU Onsite Energy
Stock No.:
49317050Used Cummins 750 kW Diesel Generator – DQFAA, Tier 2, 480V Capable, UL2085 Tank, Passed Load Test
Used-750 kW standby (680 kW prime) Cummins diesel generator set, model DQFAA, SN-H070098040. Cummins QST30-G5 engine rated 1490 HP at 1800 RPM, SN-37229540, EPA Tier 2 emissions. 3/60/120/208V, 12 lead reconnectable to 480V and other voltages. 2500 Amp 100% rated main-line circuit breaker. PMG permanent magnet generator. Oversized 1040 kW rated generator end. Engine cooling radiator rated 50C/122F ambient. UL 2200 listed stationary engine-generator-assembly. PowerCommand 2100 digital control panel. EnerGenius battery charger 10 amp 120/208/240V. Coolant heater 208/240/480V. Aluminum sound attenuated enclosure. 3600 gallon UL2085 sub-base fuel tank, with secondary containment. 792 Hours. Year 2007. Overall dimensions 113W x 341L x 165H, 60,000 lbs. (storage trailer in photo not included) Passed load test 2/11/2025.
MFR: Cummins
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.