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 1,790 results
1-25 of 1,790 results
Featured Item
Caterpillar 3512 Generator
13 0

1998 Caterpillar 3512 Generator

Price Drop
$314,092.27 USD
60 HZ, AUTO START, CAT BRAND GENSET, DIESEL, Online Owner's Manual, STANDBY,
ConditionUsed
Usage671 Hours
Stock NumberE210009A
MLS Number10860410
CategoryGenerator Sets
Last Updated3/12/2025
Location
Pointe-Claire, QC, Canada
Sold By

Toromont Power Systems

Featured Item
Cummins DQGAB Diesel Generator
11 1

2011 Cummins DQGAB Diesel Generator

$359,900 USD
Used Cummins 1500 kW standby (1350 kW prime) diesel generator set model DQGAB, SN-G110233080. Cummins QSK50-G4 engine rated 2220 HP at 1800 RPM, SN-25366503, EPA Tier 2 emissions....
ConditionUsed
Usage770 Hours
Horse Power2220 HP
Engine ModelCummins QSK50-G4 NR2
Emission RatingUSA Tier 2
Stock NumberCentral States #4600
MLS Number13318557
CategoryGenerator Sets
Last Updated3/3/2025
Location
Waukesha, WI, US
Sold By

Central States Diesel Generators

Featured Item
Cummins DFEK Diesel Generator
9 0

2025 Cummins DFEK Diesel Generator

$119,900 USD
****Just In***** New Cummins 500 kW standby (455 kW prime) diesel generator set, model DFEK, SN-A250405984. Cummins QSX15-G9 engine rated 755 HP at 1800 RPM, SN-80691765, EPA Tier 2...
ConditionNew
Horse Power755 HP
Engine ModelCummins QSX15-G9 NR2
Emission RatingUSA Tier 2
Stock NumberCentral States #4000
MLS Number13364573
CategoryGenerator Sets
Last Updated3/3/2025
Location
Waukesha, WI, US
Sold By

Central States Diesel Generators

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 D600GC Diesel Generator
11 0

2024 Caterpillar D600GC Diesel Generator

$169,500 USD
New Caterpillar 600 kW standby (545 kW prime) diesel generator D600GC, SN-R2N00322. CAT C18 engine rated 900 HP at 1800 RPM, SN-FST03455, EPA Tier 2 emissions. 3/60/277/480V. 1200 Amp and...
ConditionNew
Horse Power900 HP
Engine ModelCaterpillar C18
Emission RatingUSA Tier 2
Stock NumberCentral States #4631
MLS Number13252619
CategoryGenerator Sets
Last Updated3/3/2025
Location
Waukesha, WI, US
Sold By

Central States Diesel Generators

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 3412 Diesel Generator
11 1

1996 Caterpillar 3412 Diesel Generator

$69,900 USD
Used Caterpillar 600 kW standby (545 kW prime) diesel generator set. CAT 3412 engine rated 896 HP at 1800 RPM, SN-81Z19106. 3/60/277/480V, 12 lead reconnectable to other voltages. 1000 Amp...
ConditionUsed
Usage1,159 Hours
Horse Power896 HP
Engine ModelCaterpillar 3412
Stock NumberCentral States #4624
MLS Number13253361
CategoryGenerator Sets
Last Updated3/3/2025
Location
Waukesha, WI, US
Sold By

Central States Diesel Generators

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

Onan 100 Generator
11 0

Onan 100 Generator

Newly Listed
At auction Mar. 26
Onan 100 Generator, s/n D870884275, diesel, skid mtd. (Municipality Owned) (Runs) (Jump to Start) (Reads 204 hours) NOTE: This unit is being sold AS IS/WHERE IS via Timed Auction and is...
ConditionUsed
Usage204 Hours
Stock Number99472
MLS Number13456114
CategoryGenerator Sets
Last Updated3/19/2025
Location
Columbiana, AL, US
Listed By

JJ Kane Auctions

Onan Pro5000E Generator (Condition Unknown)
6 0

Onan Pro5000E Generator (Condition Unknown)

Newly Listed
At auction Mar. 26
Onan Pro5000E Generator (Condition Unknown) NOTE: This unit is being sold AS IS/WHERE IS via Timed Auction and is located in Villa Rica, GA. For more information removal arrangements please...
ConditionUsed
Stock NumberVG706
MLS Number13456080
CategoryGenerator Sets
Last Updated3/19/2025
Location
Villa Rica, GA, US
Listed By

JJ Kane Auctions

MTU 1750SXC6DT2 1750 Generator
11 0

MTU 1750SXC6DT2 1750 Generator

Newly Listed
At auction Mar. 26
MTU 1750SXC6DT2 1750 Generator, s/n 323832-1-2-0910, Detroit 12-Cyl diesel, (Condition Unknown) (Seller States; Was Running When Removed From Previous Job Site) (BUYER MUST LOAD) NOTE: This...
ConditionUsed
Stock Number98703
MLS Number13455998
CategoryGenerator Sets
Last Updated3/19/2025
Location
College Park, GA, US
Listed By

JJ Kane Auctions

Cummins 1250DFLC 1750 KW Generator
12 0

Cummins 1250DFLC 1750 KW Generator

Newly Listed
At auction Mar. 26
Cummins 1250DFLC 1750 KW Generator, s/n L920495377, Cummins diesel, (Condition Unknown, Exhaust Removed For Transportation) (Seller States; Was Running When Removed From Previous Job Site)...
ConditionUsed
Stock Number98701
MLS Number13455997
CategoryGenerator Sets
Last Updated3/19/2025
Location
College Park, GA, US
Listed By

JJ Kane Auctions

Cummins 1250DFLC 1250 KW Generator
10 0

Cummins 1250DFLC 1250 KW Generator

Newly Listed
At auction Mar. 26
Cummins 1250DFLC 1250 KW Generator, s/n A940529803, Cummins diesel, (Condition Unknown, Exhaust Removed For Transportation) (Seller States; Was Running When Removed From Previous Job Site)...
ConditionUsed
Stock Number98700
MLS Number13455996
CategoryGenerator Sets
Last Updated3/19/2025
Location
College Park, GA, US
Listed By

JJ Kane Auctions

Cat 500 500 KW Generator
10 0

Cat 500 500 KW Generator

Newly Listed
At auction Mar. 26
Cat 500 500 KW Generator, s/n NAP01436, Cat C15 diesel, (Condition Unknown) (Seller States: Was Running When Removed From Previous Job Site) (BUYER MUST LOAD) NOTE: This unit is being sold...
ConditionUsed
Stock Number98695
MLS Number13455995
CategoryGenerator Sets
Last Updated3/19/2025
Location
College Park, GA, US
Listed By

JJ Kane Auctions

Cummins DFEK-A034G006 500 KW Generator
9 0

Cummins DFEK-A034G006 500 KW Generator

Newly Listed
At auction Mar. 26
Cummins DFEK-A034G006 500 KW Generator, s/n G100138937, Cummins diesel, (Condition Unknown) (Seller States: Was Running When Removed From Previous Job Site) (BUYER MUST LOAD) NOTE: This unit...
ConditionUsed
Stock Number98694
MLS Number13455994
CategoryGenerator Sets
Last Updated3/19/2025
Location
College Park, GA, US
Listed By

JJ Kane Auctions

CAT LC6 500 KW Generator
8 0

CAT LC6 500 KW Generator

Newly Listed
At auction Mar. 26
CAT LC6 500 KW Generator, s/n G6B20274, Cat C15 diesel, (Condition Unknown) (Seller States: Was Running When Removed From Previous Job Site) (BUYER MUST LOAD) NOTE: This unit is being sold...
ConditionUsed
Stock Number98693
MLS Number13455993
CategoryGenerator Sets
Last Updated3/19/2025
Location
College Park, GA, US
Listed By

JJ Kane Auctions

Cummins DQDAA-7637805 250 KW Generator
6 0

Cummins DQDAA-7637805 250 KW Generator

Newly Listed
At auction Mar. 26
Cummins DQDAA-7637805 250 KW Generator, s/n I110240951, Cummins diesel, (Condition Unknown) (Seller States: Was Running When Removed From Previous Job Site) (BUYER MUST LOAD) NOTE: This unit...
ConditionUsed
Stock Number98692
MLS Number13455992
CategoryGenerator Sets
Last Updated3/19/2025
Location
College Park, GA, US
Listed By

JJ Kane 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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