Choose from a wide selection of premium commercial generators. We only advertise what we own!

kW Capacity
New / Used
Diesel / Natural Gas

Central States Diesel Generators… Power Professionals Here to Help You

We buy and sell used industrial diesel and natural gas generators sets ranging from 100 kW to 2000 kW for emergency / standby, prime power and mobile applications.

Central States Diesel Generators, LLC is located in Waukesha Wisconsin, 18 miles west of Milwaukee and about 85 miles north of Chicago, IL. Patrick Paden, CSDG President and managing partner, has over 30 years of experience working with machinery. Starting in high school, through college and beyond, he worked for a company that reconditioned used portable aggregate process equipment.

Some of the portable plants were located in remote locations requiring the use of diesel generators to power the crusher motors, conveyors, screens, and auxiliary equipment. Now, heading up Central States Diesel Generators, Patrick and his experienced team and partner network are able to provide new and high quality used diesel generator sets.

Central States Diesel Generators is also an official provider for new generators from Blue Star Power Systems. Let us know what your power generation requirements are and we’ll make sure to meet your requirements and exceed your expectations. Contact Us today for a power consultation.

Find Industrial Generators for Sale That's Right for Your Business

Used Diesel Generators for Sale

Looking for a fuel-efficient commercial generator to run your industrial projects?

Take your pick from our wide selection of options, from the biggest brands on the market. We offer all kinds of used variants giving you the freedom to make an informed purchase based on your budget and needs. With us, a used generator is never a liability and we take special care to examine the following features:

  • How many hours has the diesel generator been operated?
  • Whether the generator was primarily used in standby or continuous mode?
  • Does the generator have a good EPA rating?
  • What is the year of manufacture?
  • Does the generator have a history of regular and responsible maintenance?

Every one of the used diesel generators for sale is thoroughly vetted for quality and longevity.

New Diesel Generators for Sale

We give you access to all the best diesel generators on the market. Browse through our inventory of premium diesel generators sourced from brands like Caterpillar, Cummins, and Blue Star generators. If you don't find the one you want in stock, don't worry. We can order one customized exactly to your needs!

All the Power You Need Under One Site

Access New and Used Generators for Sale

We give you full access to both, brand new generators as well as used options. With a real-time inventory, you always have every available generator before you, allowing you to make the best decision for your business.
Take your pick from:

  • New or used diesel generators for sale
  • Portable diesel generators for sale
  • Diesel standby generators
  • 20kW to 3000kW generators

Simply filter your search, and access everything you need in one convenient location!

Choose From Premium Brands of Commercial Generators for Sale

Our inventory is well-stocked with all the biggest brands in the game. Some of our brands include:

  • CAT
  • Caterpillar
  • Cummins
  • Kohler
  • MTU
  • Baldor
  • Generac

...and more!

Type in your choice of brand in the search option, and access the best generator deals on the site. If you don't find the one you want, you can send us a request and we'll be happy to order it for you!

Product Comparisons

Unsure of what commercial generator you want, and can't decide between two brands? Our inventory allows you to access multiple brands offering similar specifications on the same generator types. Take your time and compare generator specifications, pricing, new or used options, and more. With all the information in a single location, you can now evaluate your choices in your own time, without having to rush into a decision.

Nationwide Shipping

We offer local coverage in major metropolitan areas within Indiana, Illinois, Iowa, Wisconsin, Michigan, and Minnesota. However, if you're in another state, we can deliver to you too! With nationwide shipping, distance is never a factor, so you can make a worry-free purchase any time you like!

Personalized Advice

Unsure of what generator you need? Can't find the right generator on our site? No problem! Simply give us a call at 262-955-7655 or fill out our online form and talk to us about your backup needs. We'll be happy to assist you in any way we can and find the right generator or part for all your power needs.

Why Choose Central States Diesel Generators?

Incomparable Variety

We truly value giving every one of our customers the access to choice. That's why we've made sure to partner with top brands and sellers, offering you the highest value for your money. Our inventory holds the best new and used industrial generators for sale.

Quality Assured Products

CS Diesel Generators is where affordability, choice, and quality meet. Our team of dedicated engineers makes sure that every used product is examined for defects, quality issues, and more. We only accept the best of the best, to ensure that you get the best quality for the price you pay. We understand the concerns with buying used generators, and we do our part to inspect every one of our commercial generators for sale.

Commitment to Excellence

Our team is committed to giving our customers excellent service, paired with excellent products. We believe in 100% customer satisfaction and encourage every one of our customers to talk to us about any inconveniences or issues that come along the way. We are always here to provide you with any assistance you need, with regard to an order you placed, a new purchase that proves defective, or any other grievance you may have. [Learn More About Us]

Your #1 Choice for New and Used Commercial Generators

We are driven by one common mission - to make power accessible to every business. Our unmatched dedication for buying and selling new and used generators makes us your top choice for all your power needs.

We are a team of qualified, approachable engineers who understand exactly what businesses are looking for to fulfill their commercial power needs. That's why we prioritize variety, quality products, affordable rates, excellent service, and premium brands all under one roof. We want to make your search for high-quality, cheap generators as short and effective as possible.

Find a Generator That's Right for Your Business!

Looking for high-quality new or used commercial generators for sale? Fantastic, you're one step away from finding it.

Our Brand Expertise..

We have local coverage in the following metro areas but also ship nationwide:


Quad Cities


Terre Haute


Cedar Rapids
Des Moines
Sioux City


Eau Claire
Green Bay


Ann Arbor
Battle Creek
Grand Rapids


St. Paul

Frequently Asked Questions About Diesel Generators

How Long Does an Industrial Generator Last?

While a generator’s lifespan is determined by a host of factors, if maintained well the machine can easily last for over 30,000 hours of use. On the contrary, if the generator maintenance is neglected and there is a lack of proper upkeep of the same, it may only last for about 10,000 hours.

What is the role of an Alternator in Diesel Generators?

The alternator is one of the core components of industrial generators. It is responsible for converting mechanical energy into electrical energy. The alternator comprises a stator, rotor, and brushes – all of which work together to carry the generated power.

How many volts does an industrial generator produce?

Single-phase generators produce 120, 240, and 120/240 voltages. Three-phase generators usually produce 480 volts.

How long can a commercial generator run?

In most cases, gasoline generators can run for 5 to 15 hours in a single go, while propane generators can run for up to 200 hours at a time.