Generator Sets For Sale

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

Browse real listings for new and used Generator Sets on MyLittleSalesman.com, with prices from $500 to $12,345,678. Filter by hours, price, or year to find your perfect Generator.
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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Showing 1 - 25 of 1,968 Generator Listings

1 - 25 of 1,968 listings
1 - 25 of 1,968 listings
Featured Item
2023 GENERAC G-25 TRAILER MOUNTED 25KW GENERATOR - ISUZU DIESEL - ONLY 3,000 HOURS - LIKE NEW

2023 GENERAC G-25 TRAILER MOUNTED 25KW GENERATOR - ISUZU DIESEL - ONLY 3,000 HOURS - LIKE NEW

$13,500 USD
PRO-QUIPLLC.COM CALL 954-367-3867 2023 GENERAC MDG25IF4 25KW TRAILER MOUNTED GENERATOR 3 PHASE ISUZU TURBO DIESEL ONLY 3,034 HOURS STILL LIKE NEW 100% RUST FREE AND IMMACULATE FRESH...
ConditionUsed
Usage3,034 Hours
Horse Power49 HP
Engine ModelIsuzu 2.2
Weight2771
Stock Number25 KW - ISUZU TURBO DIESEL - 3 PHASE
MLS Number14021856
CategoryGenerator Sets
Last Updated4/9/2026
Location
Pompano Beach, FL, US
Sold By
Pro Quip
Caterpillar SR4 500KW GENERATOR Diesel Generator

Caterpillar SR4 500KW GENERATOR Diesel Generator

Newly Listed
Contact for price
Location: Stone Lake, WI, Caterpillar 3412 12 Cylinder Turbo Diesel Engine, Caterpillar 500KW Generator, Hours Shown: 7030, SN:5NA06811 Bill of Sale Only Seller's Notes:, See Fabick...
ConditionUsed
Usage7,030 Hours
Stock Number99059
MLS Number14309163
CategoryGenerator Sets
Last Updated4/14/2026
Location
Merrill, WI, US
Sold By
Integrity Sales and Auction LLC
Caterpillar C15 Generator

2007 Caterpillar C15 Generator

Newly Listed
$187,500 USD
Newly Packaged CAT C15 Power Module; 2007 – 5 Test Hours; 500kW Standby Rated; 480/277V; Sound Attenuated Enclosure; Fuel Tank; Trailer Mounted; EMCP 4.2 Controller; Breaker; Zero Hour...
ConditionUsed
Usage5 Hours
Horse Power693 HP
Engine ModelCaterpillar C15
Emission RatingUSA Tier 2
Rear AxleTandem Axle
Stock Number1853
MLS Number14308978
CategoryGenerator Sets
Last Updated4/14/2026
Location
Spring, TX, US
Sold By
NineX Power Systems LLC
Hitachi Pad Mount 3 Phase Transformer

Hitachi Pad Mount 3 Phase Transformer

Newly Listed
At auction Apr. 14
Online Auction for Government Surplus - Auction Ends 04/22/2026 - To see full details, additional photos, and current bid, please open this link:, https://govdeals.bid/4cJnpBj , LOT# 3210...
Lot Number3210-503
ConditionUsed
Stock Number3210-503
MLS Number14308936
CategoryGenerator Sets
Last Updated4/14/2026
Location
West Chester, PA, US
Listed By
GovDeals, Inc.
Cummins 2500 KW Diesel Generator

2022 Cummins 2500 KW Diesel Generator

Newly Listed
$12,345,678 USD
New Cummins 2500 kW standby (2250 kW prime) diesel generator set model DQKAN, SN-I220141108. Cummins QSK60-G19 NR2 engine rated 3640 HP at 1800 RPM, SN-33228728, EPA Tier 2 emissions....
ConditionNew
Horse Power3640 HP
Engine ModelCummins QSK60-G19 NR2
Emission RatingUSA Tier 2
Stock NumberCentral States #5027
MLS Number14308872
CategoryGenerator Sets
Last Updated4/14/2026
Location
Waukesha, WI, US
Sold By
Central States Diesel Generators
Caterpillar C27 Diesel Generator

2024 Caterpillar C27 Diesel Generator

Newly Listed
$279,900 USD
New Caterpillar 800 kW standby (725 kW prime) diesel generator set, SN-GNF00195. CAT C27 engine rated 1214 HP at 1800 RPM, SN-MJE05535, EPA Tier 2 emissions. 3/60/277/480V. 1200 Amp...
ConditionNew
Horse Power1214 HP
Engine ModelCaterpillar C27
Emission RatingUSA Tier 2
Stock NumberCentral States #5032
MLS Number14308865
CategoryGenerator Sets
Last Updated4/14/2026
Location
Waukesha, WI, US
Sold By
Central States Diesel Generators
Caterpillar C27 Diesel Generator

2024 Caterpillar C27 Diesel Generator

Newly Listed
$279,900 USD
New Caterpillar 800 kW standby (725 kW prime) diesel generator set, SN-GNF00190. CAT C27 engine rated 1214 HP at 1800 RPM, SN-MJE05528, EPA Tier 2 emissions. 3/60/277/480V. 1200 Amp...
ConditionNew
Horse Power1214 HP
Engine ModelCaterpillar C27
Emission RatingUSA Tier 2
Stock NumberCentral States #5031
MLS Number14308863
CategoryGenerator Sets
Last Updated4/14/2026
Location
Waukesha, WI, US
Sold By
Central States Diesel Generators
Cummins 625GFJB Natural Gas Generator

2007 Cummins 625GFJB Natural Gas Generator

Newly Listed
$159,900 USD
Cummins 625 kW standby natural gas generator set, model 625GFJB, SN-KX07H353619. Cummins GTA38 engine rated 803 HP at 1800 RPM. 3/60/277/480V, 12 lead reconnectable to other voltages....
ConditionUsed
Usage440 Hours
Horse Power803 HP
Engine ModelCummins GTA38
Stock NumberCentral States #5030
MLS Number14308840
CategoryGenerator Sets
Last Updated4/14/2026
Location
Waukesha, WI, US
Sold By
Central States Diesel Generators
Cummins DFEJ Diesel Generator

2026 Cummins DFEJ Diesel Generator

Newly Listed
$149,900 USD
New Cummins 450 kW standby (410 kW prime) diesel generator set, model DFEJ, SN-C260540013. Cummins QSX15-G9 engine rated 755 HP at 1800 RPM, SN-80792226, EPA Tier 2 emissions. 3/60/120/208V,...
ConditionNew
Horse Power755 HP
Engine ModelCummins QSX15-G9
Emission RatingUSA Tier 2
Stock NumberCentral States #4980
MLS Number14308834
CategoryGenerator Sets
Last Updated4/14/2026
Location
Waukesha, WI, US
Sold By
Central States Diesel Generators
Caterpillar C9 Diesel Generator

2026 Caterpillar C9 Diesel Generator

Newly Listed
$92,900 USD
*****ETA Aug 1, 2026***** New Caterpillar 300 kW standby (270 kW prime) diesel generator. CAT C9 engine rated 436 HP at 1800 RPM, EPA Tier 3 emissions. 3/60/277/480V, 12 lead reconnectable...
ConditionNew
Horse Power436 HP
Engine ModelCaterpillar C9
Emission RatingUSA Tier 3
Stock NumberCentral States #5033
MLS Number14308799
CategoryGenerator Sets
Last Updated4/14/2026
Location
Waukesha, WI, US
Sold By
Central States Diesel Generators
Cummins DQDAB Diesel Generator

2017 Cummins DQDAB Diesel Generator

Newly Listed
$65,900 USD
Cummins 275 kW standby (250 kW prime) diesel generator set model DQDAB, SN-H170235929. Cummins QSL9-G7 NR3 engine rated 464 HP at 1800 RPM, SN-, EPA Tier 3 emissions. 3/60/277/480V, 12...
ConditionUsed
Usage235 Hours
Horse Power464 HP
Engine ModelCummins QSL9-G7
Emission RatingUSA Tier 3
Stock NumberCentral States #5022
MLS Number14308790
CategoryGenerator Sets
Last Updated4/14/2026
Location
Waukesha, WI, US
Sold By
Central States Diesel Generators
Kohler 50REOZJB Diesel Generator

2005 Kohler 50REOZJB Diesel Generator

Newly Listed
$19,900 USD
Kohler 49 kW standby (45 kW prime) diesel generator set model 50REOZJB, SN-2051259. John Deere model 4045TF150 engine rated 110 HP at 1800 RPM, SN-PE4045T445985. Currently set up for...
ConditionUsed
Usage447 Hours
Horse Power110 HP
Engine ModelJohn Deere 4045TF150
Stock NumberCentral States #5029
MLS Number14308786
CategoryGenerator Sets
Last Updated4/14/2026
Location
Waukesha, WI, US
Sold By
Central States Diesel Generators
MS390 Generator

2025 MS390 Generator

Recently Updated
$306,400 USD
110% Spill Containment, Auto Start, Battery Charger, Battery Disconnect Switch, Camlocks, Coolant Heater, Engine Type - Natural Gas, Frequency - 60 Hz, Hitch, Trailer, Jacket Water Heater,...
ConditionUsed
Usage6 Hours
Stock NumberRGN071
MLS Number14055098
CategoryGenerator Sets
Last Updated4/14/2026
Location
Albuquerque, NM, US
Sold By
Wagner Equipment Co.
MS390 Generator

2025 MS390 Generator

Recently Updated
$305,900 USD
110% Spill Containment, Auto Start, Battery Charger, Battery Disconnect Switch, Camlocks, Coolant Heater, Engine Type - Natural Gas, Frequency - 60 Hz, Hitch, Trailer, Jacket Water Heater,...
ConditionUsed
Usage8 Hours
Stock NumberRGN070
MLS Number14055096
CategoryGenerator Sets
Last Updated4/14/2026
Location
Albuquerque, NM, US
Sold By
Wagner Equipment Co.
Caterpillar XQ 330 Generator

2025 Caterpillar XQ 330 Generator

Recently Updated
$204,500 USD
110% Spill Containment, 3 Way Fuel Valve, Auto Start, Battery Charger, Battery Disconnect Switch, Camlocks, Cat Brand Genset, Coolant Heater, Emissions Level - EPA - EPA TIER 4f, Emissions...
ConditionUsed
Usage165 Hours
Stock NumberRGI008
MLS Number14055076
CategoryGenerator Sets
Last Updated4/14/2026
Location
Albuquerque, NM, US
Sold By
Wagner Equipment Co.
MS350 Generator

2023 MS350 Generator

Recently Updated
$250,000 USD
110% Spill Containment, Auto Start, Battery Charger, Battery Disconnect Switch, Camlocks, Coolant Heater, Engine Governor, Engine Type - Natural Gas, Frequency - 60 Hz, Generator, Hitch,...
ConditionUsed
Usage4,782 Hours
Stock NumberUE2376
MLS Number13276332
CategoryGenerator Sets
Last Updated4/14/2026
Location
Albuquerque, NM, US
Sold By
Wagner Equipment Co.

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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