Generator Sets For Sale

New or Used Generators (Gen Set) by Owners and Dealers

Generator sets, also known as a "gen set", can provide power to any job site that is not connected to grid, needs an emergency supply, or wants to perform peak shaving. The generators come in various sizes and power ratings. The fuel type of the generator may be diesel, gasoline, or natural gas, and they may be trailer-mounted, mobile, or stationary. If you're looking for just a power unit, browse our industrial power unit section.
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1-25 of 1,812 results
1-25 of 1,812 results
Featured Item
Caterpillar 3412 Generator
10 0

1995 Caterpillar 3412 Generator

Recently Updated
Call for price
Online Owner's Manual,
ConditionUsed
Usage541 Hours
Stock NumberEU00147
MLS Number12740183
CategoryGenerator Sets
Last Updated4/2/2025
Location
Knoxville, TN, US
Sold By

Stowers Power Systems

Featured Item
Atlas Copco QAS45 Generator
6 0

2023 Atlas Copco QAS45 Generator

$42,000 USD
110% Spill Containment, Auto Start, Battery Charger, Camlocks, Engine Type - Diesel, Frequency - 60 Hz, Generator, NEMA Receptables, Remaining Factory Warranty 3-Year/3,000 Hour ASPP until...
ConditionUsed
Usage2 Hours
Stock NumberEQ260342
MLS Number13459363
CategoryGenerator Sets
Last Updated3/27/2025
Location
Milford, MA, US
Sold By

Milton CAT Power Systems

Featured Item
Caterpillar G3406TA Generator
1 0

2012 Caterpillar G3406TA Generator

$31,100 USD
Online Owner's Manual,
ConditionUsed
Usage9,985 Hours
Stock NumberRP11315
MLS Number10875205
CategoryGenerator Sets
Last Updated3/27/2025
Location
Midland, TX, US
Sold By

Warren Power Systems

Featured Item
Caterpillar 3412 600KW Generator
3 0

1998 Caterpillar 3412 600KW Generator

$97,701.55 USD
Auto Start, Cat Brand Genset, Package Type Cat Standard Unit, Ultra Low Sulfur Diesel Fuel,
ConditionUsed
Usage1,070 Hours
Stock NumberE230008C
MLS Number13360296
CategoryGenerator Sets
Last Updated3/27/2025
Location
Pointe-Claire, QC, Canada
Sold By

Toromont Power Systems

Featured Item
Caterpillar 3512 Generator
13 0

1998 Caterpillar 3512 Generator

$316,299.99 USD
60 HZ, AUTO START, CAT BRAND GENSET, DIESEL, Online Owner's Manual, STANDBY,
ConditionUsed
Usage671 Hours
Stock NumberE210009A
MLS Number10860410
CategoryGenerator Sets
Last Updated3/27/2025
Location
Pointe-Claire, QC, Canada
Sold By

Toromont Power Systems

Featured Item
Caterpillar XQ200 Generator
4 0

2014 Caterpillar XQ200 Generator

Call for price
Online Owner's Manual,
ConditionUsed
Usage7,540 Hours
Stock Number028220
MLS Number12272001
CategoryGenerator Sets
Last Updated3/27/2025
Location
San Diego, CA, US
Sold By

Hawthorne Power Systems

Featured Item
Caterpillar 3516 RADIATOR Generator
5 0

2001 Caterpillar 3516 RADIATOR Generator

$5,000 USD
Inspection Report
ConditionUsed
Usage2,005 Hours
Stock NumberE16563
MLS Number13262221
CategoryGenerator Sets
Last Updated3/27/2025
Location
Florence, SC, US
Sold By

Blanchard Power Systems

Featured Item
Caterpillar 3512 Generator
23 0

2004 Caterpillar 3512 Generator

Call for price
ConditionUsed
Usage704 Hours
Stock NumberE16675
MLS Number13253928
CategoryGenerator Sets
Last Updated3/27/2025
Location
Florence, SC, US
Sold By

Blanchard Power Systems

Featured Item
Caterpillar XQ350 Mobile Power Module Generator Set
12 0

2013 Caterpillar XQ350 Mobile Power Module Generator Set

$145,500 USD
CATERPILLAR XQ350 GENERATOR, Online Owner's Manual, SKID MOUNTED,
Inspection Report
ConditionUsed
Usage1,845 Hours
Stock NumberUE01271
MLS Number11379738
CategoryGenerator Sets
Last Updated3/27/2025
Location
San Leandro, CA, US
Sold By

Peterson Power Systems

Featured Item
Caterpillar 3516B Generator Set
5 0

1999 Caterpillar 3516B Generator Set

$340,000 USD
60 HZ, CAT BRAND GENSET, CONTINUOUS, DIESEL, EMCP II+, GENERATORS, LESS THAN 1000 SINCE NEW, Online Owner's Manual, PRIME, STANDBY, USED 3516B 2000KW 2500KVA 480V 3PH 60HZ OPEN SKID,
ConditionUsed
Usage1,000 Hours
MLS Number9118451
CategoryGenerator Sets
Last Updated3/27/2025
Location
Miami, FL, US
Sold By

Pantropic Power

Featured Item
Caterpillar G20F3 Generator
4 0

2009 Caterpillar G20F3 Generator

$3,500 USD
ConditionUsed
Usage7 Hours
Stock NumberEQ027801
MLS Number12641755
CategoryGenerator Sets
Last Updated3/27/2025
Location
Milford, MA, US
Sold By

Milton CAT Power Systems

Featured Item
Caterpillar 3412 Generator
5 0

1988 Caterpillar 3412 Generator

Call for price
ConditionUsed
Usage184 Hours
Stock NumberE16617
MLS Number13197316
CategoryGenerator Sets
Last Updated3/27/2025
Location
Florence, SC, US
Sold By

Blanchard Power Systems

Featured Item
Caterpillar 3516B Generator
7 0

2024 Caterpillar 3516B Generator

$565,000 USD
** ENGINE WARRANTY BY MFG, 1825KW PRIME RATING 480V 60HZ 1800RPM - 1600KW PRIME RATING 400V 50HZ 15000 RPM, 60 HZ, CAT BRAND GENSET, DIESEL, EMCP 3.2 CONTROL PANEL - JACKET WATER HEATER,...
ConditionUsed
MLS Number965992
CategoryGenerator Sets
Last Updated3/27/2025
Location
Miami, FL, US
Sold By

Pantropic Power

Featured Item
Caterpillar D60-6 Generator
7 0

2004 Caterpillar D60-6 Generator

$4,000 USD
ConditionUsed
Usage146 Hours
Stock NumberEQ256062
MLS Number12641756
CategoryGenerator Sets
Last Updated3/27/2025
Location
Milford, MA, US
Sold By

Milton CAT Power Systems

Featured Item
Caterpillar XQ400 Generator
14 0

2008 Caterpillar XQ400 Generator

Call for price
110% SPILL CONTAINMENT, 50 HZ, 60 HZ, AUTO START, BATTERY CHARGER, BATTERY DISCONNECT SWITCH, CAT BRAND GENSET, COOLANT HEATER, DIESEL, DUAL WALL FUEL TANK, EPA LABEL, FUEL TANK, GENERATORS,...
ConditionUsed
Usage7,407 Hours
Stock NumberEU00132
MLS Number12281765
CategoryGenerator Sets
Last Updated3/27/2025
Location
Knoxville, TN, US
Sold By

Stowers Power Systems

Featured Item
Caterpillar XQ 2000 (277-480 V) 2000@1800/3/SBY EKW@RPM/PH/R Generator
6 0

Caterpillar XQ 2000 (277-480 V) 2000@1800/3/SBY EKW@RPM/PH/R Generator

$899,000 USD
60 HZ, BATTERY CHARGER, BATTERY DISCONNECT SWITCH, BRAND NEW CONTAINER, NEW 1250GLS FUEL TANK, NEW HORIZONTAL RADIATOR, NEW EXHAUST SYSTEM, GENSET CONTROL PANEL EMCP 4.4 WITH MULTIFUNCTION...
ConditionUsed
Usage1,000 Hours
MLS Number11819023
CategoryGenerator Sets
Last Updated3/27/2025
Location
Miami, FL, US
Sold By

Pantropic Power

Featured Item
Caterpillar XQ350 Mobile Power Module Generator Set
8 0

2013 Caterpillar XQ350 Mobile Power Module Generator Set

$89,500 USD
Online Owner's Manual,
ConditionUsed
Usage13,810 Hours
Stock Number028452
MLS Number12271996
CategoryGenerator Sets
Last Updated3/27/2025
Location
San Diego, CA, US
Sold By

Hawthorne Power Systems

Featured Item
Caterpillar XQ230 T4F Generator
8 0

2019 Caterpillar XQ230 T4F Generator

Call for price
Online Owner's Manual,
ConditionUsed
Usage703 Hours
Stock NumberEU00120
MLS Number12030926
CategoryGenerator Sets
Last Updated3/27/2025
Location
Knoxville, TN, US
Sold By

Stowers Power Systems

Featured Item
SOLAR TURBINES TAURUS T-60 Generator
15 0

2009 SOLAR TURBINES TAURUS T-60 Generator

Call for price
Quality Dual Fuel Turbine. 2009 Solar T60 Taurus - Portable Turbine. Call today for details.
ConditionUsed
Usage2,505 Hours
MLS Number12700614
CategoryGenerator Sets
Last Updated3/27/2025
Location
Midland, TX, US
Sold By

Warren Power Systems

Generac MD500 Generator
2 0

2010 Generac MD500 Generator

Recently Updated
$65,500 USD
Auto Start, Base Tank, Battery Charger, Circuit Breaker - 3 Pole, Control Panel, Enclosure Material - Aluminum, Engine Type - Diesel, Frequency - 60 Hz, Generator, Jacket Water Heater,...
ConditionUsed
Usage425 Hours
MLS Number13423841
CategoryGenerator Sets
Last Updated4/6/2025
Location
Jacksonville, FL, US
Sold By

Ring Power Corporation

Generac MD500 Generator
2 0

2010 Generac MD500 Generator

Recently Updated
$65,500 USD
Auto Start, Base Tank, Battery Charger, Circuit Breaker - 3 Pole, Control Panel, Enclosure Material - Aluminum, Engine Type - Diesel, Frequency - 60 Hz, Generator, Jacket Water Heater,...
ConditionUsed
Usage425 Hours
MLS Number13423840
CategoryGenerator Sets
Last Updated4/6/2025
Location
Jacksonville, FL, US
Sold By

Ring Power Corporation

Generac MD500 Generator
2 0

2010 Generac MD500 Generator

Recently Updated
$65,500 USD
Auto Start, Base Tank, Battery Charger, Circuit Breaker - 3 Pole, Control Panel, Enclosure Material - Aluminum, Engine Type - Diesel, Frequency - 60 Hz, Generator, Jacket Water Heater,...
ConditionUsed
Usage425 Hours
MLS Number13423838
CategoryGenerator Sets
Last Updated4/6/2025
Location
Jacksonville, FL, US
Sold By

Ring Power Corporation

Caterpillar XQ425KVA Generator
4 0

2024 Caterpillar XQ425KVA Generator

Recently Updated
$229,700 USD
(109 degF), 500M (1640, (kW and kVAr), and, (ModbusTCP) and, (Prime), *518BHP 340 GEN KW W/F 60 HZ PR, *CAPTIVE: 5194400C13PS118, *CERTIFICATION AR, *ELECTRIC DRIVE TRAILER, *END USE: EP...
ConditionUsed
Usage342 Hours
Stock NumberUEN236
MLS Number12801066
CategoryGenerator Sets
Last Updated4/6/2025
Location
Call Foley, MO, US
Sold By

Foley Equipment

Allmand MP25 Generator
4 0

2020 Allmand MP25 Generator

Recently Updated
$9,900 USD
.5% VOLTAGE REGULATION, 12V BATTERY, 2 - CS6369 (50A 3 PRONG LOCKING, 2 - NEMA 5-20R (20A GFI DUPLEX, 2 5/16" BALL HITCH, 22KW STANDBY 3 PH 25KVA 20KW, 52 GL FUEL TANK, 60A MAIN BREAKER,...
ConditionUsed
Usage7,809 Hours
Stock Number0AR6282
MLS Number12905601
CategoryGenerator Sets
Last Updated4/6/2025
Location
Call Foley, MO, US
Sold By

Foley Equipment

Winco Maxi-Watt Portable PTO Generator
1 0

Winco Maxi-Watt Portable PTO Generator

Newly Listed
At auction Apr. 23
Winco Maxi-Watt Portable PTO Generator. 540 PTO. 1 Axles. LT235/85R16 Front Tires. Pin Hitch. 87 Amp Capacity. Single Phase. 115/230 Volts. SN: 7189A6
ConditionUsed
Stock NumberLA2718
MLS Number13501716
CategoryGenerator Sets
Last Updated4/6/2025
Location
Malcolm, NE, US
Listed By

BigIron Auctions

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The Marketplace for Buying and Selling Industrial Generators

A generator set, aka a "gen set", can provide power to any job site that is not connected to grid or otherwise needs an emergency supply. In addition, a gen set can save money by producing power during peak hours when energy costs the most (a practice known as “peak shaving”). We are pleased to offer a huge listing of gas, natural gas, and diesel generator sets for all of your power supply needs.

Choosing the Right Gen Set

A gen set can be split into three main types:

  • Diesel Generator Sets – A diesel genset has better fuel efficiency than a gas gen set, but usually cost more. Earlier models are much noisier than modern versions.
  • Gasoline Generator Sets – Although less expensive than diesel, their components are actually more expensive to replace. More popular than diesel when it comes to intermittent use.
  • Natural Gas – The most expensive gen set to operate is also potentially explosive, so caution must be taken at all times. However, since many buildings have a natural gas line, you usually won’t need to store fuel.

Whether you choose a natural gas, gasoline, or diesel genset, you will need to decide on the best cooling system. Again, there are three types:

  • Air-cooled – The loudest and cheapest cooling system with low maintenance costs (typically received for smaller generator sets).
    Typically used for power levels ranging from 8 to 20 kilowatts.
  • Water-cooled – Larger generator sets require liquid cooling, which is quieter than air, but also more complex and oftentimes messier.
    Typically used for power levels ranging from 25 to 60 kilowatts.
  • Hydrogen – The most powerful gen set is also the most dangerous; hydrogen is highly combustible and most be closely monitored.
    Typically used for power levels above 60 kilowatts.
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