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 1,929 Generator Listings

1 - 25 of 1,929 listings
1 - 25 of 1,929 listings
Featured Item
Caterpillar XQ2000 Mobile Power Module Generator Set
4 0

Caterpillar XQ2000 Mobile Power Module Generator Set

$589,500 USD
110% Spill Containment, 3 Way Fuel Valve, Auto Start, Battery Charger, Battery Disconnect Switch, Cat Brand Genset, Coolant Heater, Engine Governor, Engine Type - Diesel, Fire Extinguisher,...
ConditionUsed
Usage7,364 Hours
Stock NumberEU00170
MLS Number13627328
CategoryGenerator Sets
Last Updated9/15/2025
Location
Knoxville, TN, US
Sold By
Stowers Power Systems
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 Updated9/15/2025
Location
Eugene, OR, US
Sold By
Peterson Power Systems
Multiquip DCA400SSI4F Diesel Generator
18 1

2014 Multiquip DCA400SSI4F Diesel Generator

Recently Updated
$64,500 USD
2014 Multiquip DCA400SSI4F - 325KW Tier 4 Final Generator, Isuzu BG-6WG1X 500HP 6-cylinder Diesel, 325KW 400KvA, 3 Phase (4 Wires), 60Hz, 240/480V, Tandem Axle Trailer Mounted (Bill of...
ConditionUsed
Usage7,746 Hours
Horse Power500 HP
Engine ModelIsuzu BG-6WG1X
Emission RatingUSA Tier 4 Final
Rear AxleTandem Axle
Stock NumberM9211
MLS Number13552840
CategoryGenerator Sets
Last Updated10/8/2025
Location
Fontana, CA, US
Sold By
Big Truck & Equipment Sales
Caterpillar C18 Generator
20 0

2021 Caterpillar C18 Generator

Price Drop
$107,658.08 USD
Base Tank, Base Type - Skid, Battery Charger, Battery Disconnect Switch, Battery Set - Standard, Cat Brand Genset, Control Panel - EMCP 4.2B, Coolant Heater, CSA Certification, Enclosure...
Inspection Report
ConditionUsed
Usage6,087 Hours
Stock NumberOKL6249723
MLS Number13401945
CategoryGenerator Sets
Last Updated10/8/2025
Location
Surrey, BC, Canada
Sold By
Caterpillar Financial Services Corporation
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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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