Simonsen Generator Service, Inc. was established in 1980 as a power generation service dealer. We provide repairs, parts, rentals and sales for electric generators and their associated components. Customers include RV owners, car dealers, home developers, commercial standby generator owners, mine operators, industrial plants, ranchers, electric utility companies, commercial contractors, government agencies, broadcast and communication businesses. Learn more about our parts, product lines, sales and repair departments below.


We maintain an inventory of repair, maintenance and service parts. Trained parts personnel research and order parts needed by our service department and customers.

Here are some of the many brands that we carry:

Duetz • Generac • Isuzu • Kohler • Lister-Petter • Onan • Wisconsin


New and used diesel, LP gas and natural gas generator sets, automatic transfer switches and associated accessories for commercial mobile, standby and prime power application. We can assist you in finding the right generator for your business or personal use.


In-shop diagnostic testing and repairs preformed by factory-trained service technicians help to get your machine back on track.

Plus, with our factory-trained field service technicians we're able to perform on-site repairs and preventative maintenance service from utility trucks stocked with tools and repair parts.