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 1,846 results
1-25 of 1,846 results
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 Updated2/24/2025
Location
San Diego, CA, US
Sold By

Hawthorne Power Systems

Featured Item
Caterpillar XQ30 Generator
11 0

2015 Caterpillar XQ30 Generator

$18,762 USD
CATERPILLAR XQ30 GENERATOR, Horsepower 49.0 hp, Online Owner's Manual, TRAILER VIN #16MBB1311FG072685,
Inspection Report
ConditionUsed
Usage18,961 Hours
Stock NumberUE01350
MLS Number12165367
CategoryGenerator Sets
Last Updated2/24/2025
Location
San Leandro, CA, US
Sold By

Peterson Power Systems

Featured Item
Caterpillar 3512 Generator
13 0

1998 Caterpillar 3512 Generator

$325,800.64 USD
60 HZ, AUTO START, CAT BRAND GENSET, DIESEL, Online Owner's Manual, STANDBY,
ConditionUsed
Usage671 Hours
Stock NumberE210009A
MLS Number10860410
CategoryGenerator Sets
Last Updated2/24/2025
Location
Pointe-Claire, QC, Canada
Sold By

Toromont 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 Updated2/24/2025
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 Updated2/24/2025
Location
San Leandro, CA, US
Sold By

Peterson Power Systems

Featured Item
Caterpillar G20F3 Generator
4 0

2009 Caterpillar G20F3 Generator

$3,500 USD
ConditionUsed
Usage7 Hours
Stock NumberEQ027801
MLS Number12641755
CategoryGenerator Sets
Last Updated2/24/2025
Location
Milford, MA, US
Sold By

Milton CAT 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 Updated2/24/2025
Location
Miami, FL, US
Sold By

Pantropic Power

Featured Item
Caterpillar XQ 35 Generator
1 0

2023 Caterpillar XQ 35 Generator

$44,750 USD
110% Spill Containment, Cat Brand Genset, Emissions Level - EPA - EPA TIER 4f, Engine Governor, Engine Type - Diesel, Frequency - 60 Hz, Fuel Tank Type - Dual Wall, Generator, Hitch, Trailer...
ConditionUsed
Usage2 Hours
Stock NumberRP15612
MLS Number13174651
CategoryGenerator Sets
Last Updated2/24/2025
Location
Midland, TX, US
Sold By

Warren Power Systems

Featured Item
Caterpillar XQ 1750 Generator
6 0

2000 Caterpillar XQ 1750 Generator

$685,000 USD
Package Type Dealer Packaged Unit,
ConditionUsed
Usage300 Hours
MLS Number12472297
CategoryGenerator Sets
Last Updated2/24/2025
Location
Fort Myers, FL, US
Sold By

Pantropic Power

Featured Item
Caterpillar 3412 Generator
10 0

1995 Caterpillar 3412 Generator

Call for price
Online Owner's Manual,
ConditionUsed
Usage541 Hours
Stock NumberEU00147
MLS Number12740183
CategoryGenerator Sets
Last Updated2/24/2025
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 Updated2/24/2025
Location
Miami, FL, US
Sold By

Pantropic Power

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 Updated2/24/2025
Location
Knoxville, TN, US
Sold By

Stowers Power Systems

Caterpillar 341C Generator
17 0

1999 Caterpillar 341C Generator

Recently Updated
$135,000 USD
ConditionUsed
Usage296 Hours
Stock NumberEPU11390
MLS Number13365208
CategoryGenerator Sets
Last Updated2/28/2025
Location
Indianapolis, IN, US
Sold By

MacAllister Machinery

Olympian D200P4 Generator
12 0

2004 Olympian D200P4 Generator

Recently Updated
$30,000 USD
ConditionUsed
Usage388 Hours
Stock NumberEPU11388
MLS Number13334249
CategoryGenerator Sets
Last Updated2/28/2025
Location
Indianapolis, IN, US
Sold By

MacAllister Machinery

Caterpillar C15 Generator
16 0

2007 Caterpillar C15 Generator

Recently Updated
$85,000 USD
ConditionUsed
Usage147 Hours
Stock NumberEPU11387
MLS Number13334245
CategoryGenerator Sets
Last Updated2/28/2025
Location
Indianapolis, IN, US
Sold By

MacAllister Machinery

Caterpillar 3456 Generator
8 0

2003 Caterpillar 3456 Generator

Newly Listed
Call for price
== Information in English == Empty weight: 7.500 kg, Type number: 3456 GENERATOR 455KVA Engine Brand: CATERPILLAR, Conditie: USED, Engine Cooling Type: Radiator Cooled (std), Engine Color:...
ConditionUsed
Stock Number0215732
MLS Number13423418
CategoryGenerator Sets
Last Updated2/28/2025
Location
Hamont-Achel, Belgium
Sold By

Hamofa Industrial Engines

MAN E2842E Generator
8 0

MAN E2842E Generator

Newly Listed
Call for price
== Information in English == Empty weight: 3.800 kg, Dimensions (LxBxH): 370 x 185 x 220 cm, Type number: E2842E GENERATOR 450KVA Engine Brand: MAN, Conditie: USED, Engine Cooling Type:...
ConditionUsed
Stock Number0215769
MLS Number13423412
CategoryGenerator Sets
Last Updated2/28/2025
Location
Hamont-Achel, Belgium
Sold By

Hamofa Industrial Engines

Iveco 66 KVA Generator
8 0

1997 Iveco 66 KVA Generator

Newly Listed
Call for price
== Information in English == Empty weight: 1.800 kg, Dimensions (LxBxH): 300 x 120 x 170 cm, Type number: 8061 I 06.05 A510 generator 66KV Engine Brand: IVECO, Conditie: USED, Engine Cooling...
ConditionUsed
Stock Number0215785
MLS Number13423411
CategoryGenerator Sets
Last Updated2/28/2025
Location
Hamont-Achel, Belgium
Sold By

Hamofa Industrial Engines

Caterpillar XQ35 Generator
3 0

2024 Caterpillar XQ35 Generator

Recently Updated
$49,500 USD
Online Owner's Manual,
ConditionUsed
Usage125 Hours
Stock NumberEE19873
MLS Number13329425
CategoryGenerator Sets
Last Updated2/28/2025
Location
Yuma, AZ, US
Sold By

Empire Machinery

Caterpillar XQ35 Generator
3 0

2024 Caterpillar XQ35 Generator

Recently Updated
$49,750 USD
Online Owner's Manual,
ConditionUsed
Usage1 Hours
Stock NumberEE19871
MLS Number13329424
CategoryGenerator Sets
Last Updated2/28/2025
Location
Tucson, AZ, US
Sold By

Empire Machinery

Caterpillar 3412 Generator
7 0

1990 Caterpillar 3412 Generator

Recently Updated
$54,000 USD
Online Owner's Manual,
ConditionUsed
Usage1,131 Hours
Stock NumberEE22050
MLS Number13329295
CategoryGenerator Sets
Last Updated2/28/2025
Location
Phoenix, AZ, US
Sold By

Empire Machinery

Cummins C100N6 Natural Gas Generator
10 0

2025 Cummins C100N6 Natural Gas Generator

Recently Updated
$39,900 USD
*****Just arrived*****New Cummins 100 kW standby natural gas / propane generator set, model C100N6, SN-B250416311. Cummins QSJ5.9G-G3 engine rated 162 HP at 1800 RPM, EPA certified,...
ConditionNew
Horse Power162 HP
Engine ModelCummins QSJ5.9G-G3
Stock NumberCentral States #4223
MLS Number13403117
CategoryGenerator Sets
Last Updated2/28/2025
Location
Waukesha, WI, US
Sold By

Central States Diesel Generators

Cummins C100N6 Natural Gas Generator
10 0

2025 Cummins C100N6 Natural Gas Generator

Recently Updated
$39,900 USD
*****Just arrived*****New Cummins 100 kW standby natural gas / propane generator set, model C100N6, SN-B250416310. Cummins QSJ5.9G-G3 engine rated 162 HP at 1800 RPM, EPA certified,...
ConditionNew
Horse Power162 HP
Engine ModelCummins QSJ5.9G-G3
Stock NumberCentral States #4222
MLS Number13403116
CategoryGenerator Sets
Last Updated2/28/2025
Location
Waukesha, WI, US
Sold By

Central States Diesel Generators

Cummins DQFAD Diesel Generator
8 0

2025 Cummins DQFAD Diesel Generator

Recently Updated
$319,900 USD
*****ETA Mar 6, 2025**** New Cummins 1000 kW standby (900 kW prime) diesel generator set, model DQFAD. Cummins QST30-G5 NR2 engine rated 1490 HP at 1800 RPM, EPA Tier 2 emissions. ...
ConditionNew
Horse Power1490 HP
Engine ModelCummins QST30-G5 NR2
Emission RatingUSA Tier 2
Stock NumberCentral States #4021
MLS Number13387367
CategoryGenerator Sets
Last Updated2/28/2025
Location
Waukesha, WI, US
Sold By

Central States Diesel Generators

Cummins DQFAD Diesel Generator
8 0

2025 Cummins DQFAD Diesel Generator

Recently Updated
$319,900 USD
*****ETA March 6, 2025**** New Cummins 1000 kW standby (900 kW prime) diesel generator set, model DQFAD. Cummins QST30-G5 NR2 engine rated 1490 HP at 1800 RPM, EPA Tier 2 emissions. ...
ConditionNew
Horse Power1490 HP
Engine ModelCummins QST30-G5 NR2
Emission RatingUSA Tier 2
Stock NumberCentral States #4020
MLS Number13387366
CategoryGenerator Sets
Last Updated2/28/2025
Location
Waukesha, WI, US
Sold By

Central States Diesel Generators

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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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