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Commercial Generators

Different industries have different concerns when it comes to standby power. Health care applications must abide by strict regulations regarding life safety. Data centers seek a certain Tier Certification. Whatever the unique needs of the industry you serve, Generac has the expertise to help you design, install, commission, and support a standby power system that will meet them.

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At Generac, we have a single focus: Power. That dedication and expertise has made us the leader in gaseous-fueled standby generators, with the broadest line of standby solutions in the industry. All of our gaseous-fueled generators are made with the highest quality, most reliable materials, and feature state-of-the-art technical innovations to improve their performance and reliability. Paired with the innate reliability of natural gas, it’s the smartest choice you can make.
Generac Spark-Ignited Engines: Engineered for Standby Power

Applying gaseous fuel to standby power systems takes advanced engineering expertise to ensure reliability and long life. That’s why Generac builds its spark-ignited engines from the block up. Adding the fuel system. Hardening the valves and seats. Adjusting engine timing. This allows Generac engines to last longer, require less maintenance, and perform more reliably in a standby power system than a third-party spark-ignited engine. And each Generac engine meets the required EPA emission standards at the factory.


Reliable, Accurate, Integrated Controls Generac engineers its generator controls with safety and convenience as top priorities. PowerManager® digital controls let you monitor and control key elements of your generator system with the touch of a button or click of a mouse. In addition, features like constant monitoring capabilities, adjustable parameters and built-in protective alarms combine with seamlessly integrated components for the highest level of reliability

Protection from the Elements

By manufacturing our own generator enclosures, Generac is able to ensure each unit combines the highest level of durability with the latest engineering advancements in noise reduction, weather resistance and streamlined design.

Optimized for Performance

Generac industrial alternators are machine wound, machine inserted, and machine varnished for the ultimate in consistency. Form winding and stack bracing ensures reliable performance. Rotor spin balancing eliminates vibration. And vented rotors contribute to cooler operation, longer life and enhanced efficiency.

Rugged Base Frames

Generac’s heavy-duty base frames ensure accurate alignment between the engine and alternator at all times. Oil and water drain points are situated for easy access. Vibration isolators contribute to smooth operation. And power cable stub-ups are positioned for easy installation.

For industry, power failure is not an option.
Generac industrial diesel gensets are custom configured to meet the specific requirements of each application. Heavy duty engines have proven their performance and reliability in industrial applications.
Major components designed and manufactured by Generac

Vertically integrated environment, ensures the highest reliability standards.

Easily serviced by any qualified diesel technician.
National industrial dealer network
Factory-certified technicians with expertise in everything from system design to diagnostics and repairs.
Readily available replacement parts and maintenance items.
Reliability and Convenience
Reliability starts at the core of any great product. At the heart of the generator set is a fuel efficient, emissions compliant diesel engine and a brushless alternator with permanent magnet generator excitation system. The base generator set is then fitted with primary fuel filter, electrical gear along with other features that can include battery charger, engine coolant heater, oil level monitoring, and other options before being fitted into the sound attenuated enclosure. A large integral fuel tank is added along with internal mount exhaust silencer and heavy duty air cleaners.
Convenience only happens when you listen to your customers and pay attention to details. Years of field experience have revealed several design areas that make operation and setup an easy task. The digital genset controller and power connections are mounted at eye level and are accessed through large operator interface doors located on the exterior of the enclosure. Bus bars and shore power connections are included for easy power connections for the genset output power and to supply AC power for lighting and convenience features. Input and output power connections can be routed through the bottom or the side of the enclosure. DC lighting with timer switches can be supplied in the enclosure and operator compartments for use when AC power is not available.
Stationary Gensets
Providing the industry’s most comprehensive line of emergency standby, industrial prime or peak shaving power systems in any imaginable configuration; you can count on Generac to design and build your genset exactly to fit your needs. You can depend on Generac to provide the peace of mind you desire. Don’t accept poor power or power outages from the utility. You can rest assured a Generac stationary genset will provide your place of business, house, or industrial building clean and reliable power.

Generac generators are designed to meet your stringent requirements for quality electrical power and mechanical durability. They are designed for the standby or prime power requirements of industrial, commercial, health care, telecommunication and data center applications. Our systems are designed to help you with peak shaving and interruptible rate applications as well. Generac generators provide high quality and reliability at affordable and competitive prices.

When space is at a premium and reliability is critical, Generac’s Gemini Twin Pack is the answer.

An option of Generac’s modular power system (MPS), you can purchase the system you need today, and install additional units quickly and easily as your standby power requirements increase.

Packs more power into a smaller space

Gemini combines the output of two 500 kW generators packaged inside a single weather resistant and sound attenuated enclosure using Generac’s exclusive PowerManager control system. The result is 1000 kilowatts (1MW) of power in a space up to 40% smaller than a large, single engine genset.

Paralleled Power

As part of Generac’s MPS technology, up to seven Gemini gensets can be paralleled without additional switchgear, for a total output of up to 7000 kW.

Single, electrical termination point

Offers easier connection.

Inherent critical load redundancy within one common generator platform.

Gemini’s load shedding capability ensures that critical loads are covered even if one of the gensets is offline for maintenance.

Quiet, sound-attenuated operation.
Easy serviceability

Engines can be serviced by a qualified diesel technician using commonly available parts.

Generac Bi-Fuel™ generators start on diesel fuel and add natural gas as load is applied, until the unit runs primarily on natural gas. Generac’s Bi- Fuel generators are fully integrated solutions, not after-market conversions in the field. That means every component is specifically designed, engineered, and factory validated to work together. Generac Bi-Fuel generators have the added benefit of being EPA compliant from the factory—the only bi-fuel systems on the market that can make such a claim.
Risk Mitigation via Fuel Redundancy

Despite the perceived reliability of on-site diesel fuel, power outages can damage infrastructure and make diesel refueling difficult or impossible. Generac Bi-Fuel generators mitigate refueling issues by operating primarily on utility-supplied natural gas. That means less on-site diesel fuel is required and running times will be greatly extended compared to diesel-only solutions. And because the natural gas infrastructure tends not to be affected by the same conditions that lead to power outages, fuel reliability is improved.

Lower Total Cost of Ownership

Because natural gas costs less than diesel, fuel costs are significantly reduced over the long term. And since less on-site diesel fuel is required for long running times, installation, operational and maintenance costs are reduced.

Scalability as Part of a Modular Power System

Generac Bi-Fuel generators can be configured as part of a Modular Power System (MPS)—connected via integrated paralleling with other Generac generators. This makes the system scalable, meaning there is no need to install more power than you need.

Code Compliance

Generac Bi-Fuel generators meet the on-site fuel requirements for emergency systems as referenced in NEC700 and NFPA 110. Less on-site diesel fuel means easier permitting. And indoor fuel installations with capacity limits per NFPA or local codes become a viable option.

Reduced Exhaust Emissions

Bi-fuel generators are cleaner and more environmentally friendly than diesel-only generators. They emit about 30% less nitrogen oxides and 50% less particulate matter than comparable diesel-only units.