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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Showing 1 - 25 of 2,034 Generator Listings

1 - 25 of 2,034 listings
1 - 25 of 2,034 listings
Featured Item
Caterpillar XQ570 Diesel Generator
12 1

2020 Caterpillar XQ570 Diesel Generator

Recently Updated
$229,900 USD
Caterpillar XQ570 500 kW standby (455 kW prime) rental grade diesel generator, SN-ME500244. CAT C18 engine rated 779 HP at 1800 RPM, SN-CM800382, EPA Tier 4 Final emissions. 3/60/277/480V or...
ConditionUsed
Usage2,010 Hours
Horse Power779 HP
Engine ModelCaterpillar C18
Emission RatingUSA Tier 4 Final
Rear AxleTandem Axle
Stock NumberCentral States #4813
MLS Number13752166
CategoryGenerator Sets
Last Updated8/29/2025
Location
Waukesha, WI, US
Sold By
Central States Diesel Generators
Featured Item
Caterpillar C32 Diesel Generator
12 1

2021 Caterpillar C32 Diesel Generator

Recently Updated
$299,500 USD
New Caterpillar 1000 kW standby (910 kW prime) diesel generator SN-JSJ04792. CAT C32 engine rated 1502 HP at 1800 RPM, SN-PRH08985, EPA Tier 2 emissions. 3/60/277/480V. 1600 Amp main-line...
ConditionNew
Usage3 Hours
Horse Power1502 HP
Engine ModelCaterpillar C32
Emission RatingUSA Tier 2
Stock NumberCentral States #4729
MLS Number13590715
CategoryGenerator Sets
Last Updated8/27/2025
Location
Waukesha, WI, US
Sold By
Central States Diesel Generators
Featured Item
2021 MTU DS 100 Generator
17 0

2021 MTU DS 100 Generator

$29,500 USD
MTU DS 100 GENERATOR SET., MODEL NO. 4R0120, ENGINE: OM924LA - MERCEDES BENZ 4CYL TURBO CHARGED, KVA: 100, PH-3 / 60HZ, VOLT: 120-208 400 AMP BREAKER, WIRE CONFIG: WYE, BASE TANK: ZBM...
Warranty
ConditionNew
Usage1 Hours
Horse Power330 HP
Engine ModelMercedes OM924LA
Emission RatingTIER 3
L x W148 x 52
Capacity100kva
Weight13,000LBS
Stock NumberPADS100
MLS Number13765602
CategoryGenerator Sets
Last Updated8/17/2025
Location
Huntingdon Valley, PA, US
Sold By
MidState Machinery LLC
Featured Item
Cummins 2500 KW Diesel Generator
10 1

2025 Cummins 2500 KW Diesel Generator

$1,349,900 USD
*****Just arrived***** New Cummins 2500 kW standby (2250 kW prime) diesel generator set model DQKAN, SN-E250449528. Cummins QSK60-G19 NR2 engine rated 3640 HP at 1800 RPM, SN-33238429, EPA...
ConditionNew
Horse Power3640 HP
Engine ModelCummins QSK60-G19 NR2
Emission RatingUSA Tier 2
Stock NumberCentral States #4334
MLS Number13675903
CategoryGenerator Sets
Last Updated8/18/2025
Location
Waukesha, WI, US
Sold By
Central States Diesel Generators
Featured Item
Caterpillar XQ 350 (120-480 V) 350@1800/3/SBY EKW@RPM/PH/R Generator
8 0

2014 Caterpillar XQ 350 (120-480 V) 350@1800/3/SBY EKW@RPM/PH/R Generator

$110,000 USD
110% SPILL CONTAINMENT, 3 WAY FUEL VALVE, 60 HZ, AUTO START, BATTERY CHARGER, BATTERY DISCONNECT SWITCH, CAT BRAND GENSET, CAT C13 ENGINE, CATERPILLAR XA350 TIER4I, CIRCUIT BREAKER, CEM,...
Inspection Report
ConditionUsed
Usage6,727 Hours
Stock NumberNR12802
MLS Number13305187
CategoryGenerator Sets
Last Updated8/12/2025
Location
Eugene, OR, US
Sold By
Peterson Power Systems
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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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