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

Shop new and used Generator Sets on MyLittleSalesman.com, with prices from $500 to $1,349,900. Apply filters for hours, price, or year to focus your search.
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 1,901 Generator Listings

1 - 25 of 1,901 listings
1 - 25 of 1,901 listings
Featured Item
2023 GENERAC G-25 TRAILER MOUNTED 25KW GENERATOR - ISUZU DIESEL - ONLY 3,000 HOURS - LIKE NEW
26 0

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 Updated12/11/2025
Location
Pompano Beach, FL, US
Sold By
Pro Quip
Featured Item
Used Like NEW Generator 20 KW 2022 Allmand Maxi-Power25 Diesel Portable Trailer Mounted LOW HOURS!! NON DEF!
20 1

Used Like NEW Generator 20 KW 2022 Allmand Maxi-Power25 Diesel Portable Trailer Mounted LOW HOURS!! NON DEF!

$20,000 USD
FREE SHIPPING! (to most US states) NEW! Generator 20 KW 2022 Allmand Maxi-Power25 Diesel Portable Trailer Mounted LOW HOURS!! NOW OFFERING EASY BUSINESS OR PERSONAL FINANCING! WE TAKE...
ConditionUsed
Usage2 Hours
Stock NumberTC1025472104DS200
MLS Number13953991
CategoryGenerator Sets
Last Updated12/22/2025
Location
Orem, UT, US
Sold By
Global Remarketing
Cummins DQFAD Diesel Generator
8 0

2025 Cummins DQFAD Diesel Generator

Newly Listed
$379,900 USD
*****Ready to ship*****New Cummins 1000 kW standby (900 kW prime) diesel generator set, model DQFAD, SN-L250516247. Cummins QST30-G5 NR2 engine rated 1490 HP at 1800 RPM, SN-37297028, EPA...
ConditionNew
Horse Power1490 HP
Engine ModelCummins QST30-G5 NR2
Emission RatingUSA Tier 2
Stock NumberCentral States #4310
MLS Number14069981
CategoryGenerator Sets
Last Updated1/3/2026
Location
Waukesha, WI, US
Sold By
Central States Diesel Generators
Cummins DQFAD Diesel Generator
8 0

2025 Cummins DQFAD Diesel Generator

Newly Listed
$379,900 USD
*****Ready to ship*****New Cummins 1000 kW standby (900 kW prime) diesel generator set, model DQFAD, SN-L250516246. Cummins QST30-G5 NR2 engine rated 1490 HP at 1800 RPM, SN-37297058, EPA...
ConditionNew
Horse Power1490 HP
Engine ModelCummins QST30-G5 NR2
Emission RatingUSA Tier 2
Stock NumberCentral States #4309
MLS Number14069978
CategoryGenerator Sets
Last Updated1/3/2026
Location
Waukesha, WI, US
Sold By
Central States Diesel Generators
ALTORFER POWER SYSTEMS APS100 Generator
12 0

2016 ALTORFER POWER SYSTEMS APS100 Generator

Newly Listed
$16,650 USD
110% Spill Containment, 3 Way Fuel Valve, Auto Start, Battery Charger, Battery Disconnect Switch, Camlocks, Cat Brand Genset, Engine Type - Diesel, Frequency - 60 Hz, Fuel Tank Type - Dual...
ConditionUsed
Usage8,780 Hours
Stock NumberRGD029
MLS Number14069891
CategoryGenerator Sets
Last Updated1/3/2026
Location
Albuquerque, NM, US
Sold By
Wagner Equipment Co.
Cummins C500N6B Natural Gas Generator
11 0

2025 Cummins C500N6B Natural Gas Generator

Recently Updated
$299,900 USD
*****Ready to ship*****New Cummins 500 kW standby natural gas generator set, model C500N6B, SN-00916005. Cummins GTA 28E engine rated 770 HP at 1800 RPM, SN-99801549, EPA certified for...
ConditionNew
Horse Power770 HP
Engine ModelCummins GTA 28E
Stock NumberCentral States #4388
MLS Number14001729
CategoryGenerator Sets
Last Updated1/3/2026
Location
Waukesha, WI, US
Sold By
Central States Diesel Generators
Cummins DQCB Diesel Generator
10 0

2025 Cummins DQCB Diesel Generator

Recently Updated
$259,900 USD
*****Ready to ship*****New Cummins 750 kW standby (680 kW prime) diesel generator set, model DQCB, SN-J250498573. Cummins QSK23-G7 engine rated 1220 HP at 1800 RPM, SN-85025073, EPA Tier 2...
ConditionNew
Horse Power1220 HP
Engine ModelCummins QSK23-G7 NR2
Emission RatingUSA Tier 2
Stock NumberCentral States #4304
MLS Number13951041
CategoryGenerator Sets
Last Updated1/3/2026
Location
Waukesha, WI, US
Sold By
Central States Diesel Generators
Cummins C150N6 Natural Gas Generator
10 0

2025 Cummins C150N6 Natural Gas Generator

Recently Updated
$59,900 USD
*****Ready to ship*****New Cummins 150 kW standby natural gas / propane generator set, model C150N6, SN-I250493050. Cummins QSJ8.9G engine rated 240 HP at 1800 RPM, SN-99625196, EPA...
ConditionNew
Horse Power240 HP
Engine ModelCummins QSJ8.9G
Stock NumberCentral States #4237
MLS Number13870433
CategoryGenerator Sets
Last Updated1/3/2026
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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