A generator serves as a cost-effective primary power source and a source of emergency/backup power.

Generators prevent discontinuity of daily activities and business operations by providing power when and where needed—whether the need is to supply electrical power during a power outage or portable power for hard-to-reach locations.

A diesel generator (also known as a “DG”) is a combination of an electric generator and a diesel engine, which converts chemical energy into mechanical energy via combustion. Thereafter, this mechanical energy is converted into electrical energy.

In addition to being a traditional choice for high KW applications, a diesel power generator is used at facilities with code requirements for on-site fuel tank storage, such as emergency response centers and hospitals.

Caterpillar Inc., Cummins Inc., and Generac Holdings, Inc. are the world’s best diesel generator brands.

Read on to learn more about the top players in the global diesel generator market.

Global Top Diesel Generator Manufacturers [2026]

Here are the world’s leading diesel genset manufacturers (listed alphabetically) :

Aggreko

Founded: 1962

Location: Glasgow, United Kingdom

Founded by Luc Koopmans as a power generator rental business Aggreko is one of the top diesel generator brands in the world. Aggreko has grown into a world-renowned supplier of energy storage and power generation, as well as heating, cooling, and drying products.

With 60+ years of experience in enabling businesses and communities to thrive with best-in-class energy solutions, Aggreko is a trusted name in power generation and temperature control equipment.

Aggreko designs and builds generators at its industry-accredited manufacturing facility in Scotland.

Aggreko diesel generators are available in either a 20-ft ISO container or soundproofed canopy for enhanced durability and security and easy transportation by air, rail, road, or sea.

In addition, Aggreko provides a fast and flexible commercial generator rental service to meet varied power requirements of customers while saving on costs, fuel, and emissions. Aggreko also offers a load-on-demand set-up with voltage regulator in which its portable diesel generators automatically turn on and off based on a site’s load demands.

Aggreko diesel generator range includes:

• 30 kVA Stage V Generator

• 60 kVA Stage V Generator

• 100 kVA Stage V Generator

• 200 kVA Stage V Generator

• 600 kVA Stage V Generator

• 60 kVA Diesel Generator

• 125 kVA Diesel Generator

• 200 kVA Diesel Generator

• 320 kVA Diesel Generator

• 350 kVA Diesel Generator

• 500 kVA Diesel Generator

• 500 kVA Containerized Diesel Generator

• 800 kVA Containerized Diesel Generator

• 1000 kVA Containerized Diesel Generator

• 1250 kVA Containerized Diesel Generator

• 1500 kVA Containerized Diesel Generator

• 2100 kVA Containerized Diesel Generator

Furthermore, Aggreko diesel generators utilize remote monitoring technology to ensure 24/7 equipment surveillance, minimize risks, and maximize uptime.

Atlas Copco

Founded: 1873

Location: Stockholm, Sweden

The Atlas Copco Group was founded as “Atlas” (1873), which became “Atlas Diesel” (1917) before being renamed “Atlas Copco” (1956).

Today, the 150-year-old company has customers in 180+ countries.

Atlas Copco provides robust, reliable, and versatile generators with easy serviceability and excellent best-in-class fuel economy.

Atlas Copco’s generator portfolio includes:

Mobile Gas & Diesel Generators

• Small Portable Gas (P 2000i W, P 3000 W, P 3500i W, P 6500 W, and P 8000 W)

• Small Towable Diesel (QAS 25, QAS 45, and QAS 70)

• Medium Towable Diesel (QAS 125, QAS 150, QAS 200, and QAS 95)

• Large Towable Diesel (QAS 250, QAS 330, QAS 410, and QAS 700)

• QAC 1500 TwinPower (a 20-foot containerized backup generator providing up to 1450 kVA)

QAX Mobile Diesel Generators

The Atlas Copco QAX mobile diesel generators (up to 100 kVA) provide uninterrupted power on the move. The single-axle sturdy undercarriage with parking brakes makes these reliable generators easy to move on the site.

In addition, diesel generators come with a four-cylinder, high-performance engine and a highly efficient alternator and are flexible for a variety of applications (electrical pumps, wire saw-cutting machines, etc.).

Atlas Copco diesel generators are built for multi-application purposes (such as heavy-duty construction and rental applications) and help companies boost profitability while minimizing unplanned shutdowns.

Caterpillar Inc.

Founded: 1925

Location: Irving, Texas, United States

Caterpillar Inc. (known by the brand name “Cat”) is a globally leading generator manufacturer. Also expertise in construction and mining equipment, diesel-electric locomotives, industrial gas turbines, and off-highway diesel and natural gas engines.

Caterpillar mainly operates through three primary segments, including Construction Industries, Resource Industries, and Energy & Transportation. The company also provides financing and related services through its Financial Products segment.

Caterpillar’s Electric Power Systems include a comprehensive range of commercial and industrial diesel generator sets used in a variety of applications. Caterpillar’s natural gas and diesel mobile generators are engineered for easy transportation and fast installation.

Caterpillar’s diesel engine generator sets are known for high efficiency, global emissions compliance, and low fuel consumption. With power potential from 6-5,720 eKW (7.5-7,150 kVA), these generator parts sets are built to world-class standards, easy to install, and available in a variety of options matching customers’ power needs.

Caterpillar diesel generator set portfolio includes (but is not limited to) the following:

Caterpillar commercial and industrial generators deliver clean, economical, and reliable power for prime, continuous, or standby power service.

Cummins Inc.

Founded: 1919

Location: Columbus, Indiana, United States

Founded by Clessie Cummins, Cummins Inc. (Cummins) is among the top 10 generator companies in the world of global power technology. Cummins Inc. serves customers through a network of company-owned and independent distributor locations worldwide.

Cummins designs, manufactures, distributes, and services a broad range of power solutions. The company’s products range from electric and hybrid integrated power solutions to turbochargers and air handling systems.

Cummins generators are available to provide reliable power for every need—from data centers and hospitals to drilling and mining operations.

Cummins offers a comprehensive range of generators for the following applications, fuel types, and industries:

Application

• Commercial Mobile Generator

• Home Standby Generator

• Portable Generator

• Prime Power

• Standby Power

Fuel Type

• Diesel Generator

• Gasoline Generator

• Natural Gas Generator

• Propane Generator

• Custom Generators

Industry

• Data Center Backup Power

• Healthcare Generators

• Marine Gensets

• RV Generators

Cummins generator portfolio by “diesel” fuel type includes (but not limited to) the following:

• QSL9 I-Range

• Onan Marine QD 40-110 kW commercial diesel generator

• 6BTAA5.9

• KTA38 Series

• QSM11

• VTA28

• C1250D6E/C1500D6E Centum™ Series portable diesel generator

• 140-400 kVA Diesel Generators

• 500-1010 kVA Diesel Generators

• 1250-3750 kVA Diesel Generators

Cummins manufactures all the major generator components, including the alternator, engine, control systems, and containers, ensuring each element of a generator set works in harmony from the start.

Cummins diesel generators are designed for tough commercial applications and offer outstanding value with features like increased cooling efficiency, low harmonic distortion, and smooth operation.

Cummins’ solution design expertise and integrated equipment and communication software, as well as generator maintenance services help customers maintain resilient operations without any hassle.

Generac Holdings, Inc.

Founded: 1959

Location: Waukesha, Wisconsin, United States

Generac Holdings, Inc. (also known as “Generac Power Systems, Inc.” and “Generac”) is a one among the globally leading diesel generator companies that designs and manufactures energy technology solutions and other power generation products for commercial, industrial, and residential markets.

Generac Industrial Power (a business unit within Generac Power Systems) offers fully automatic transfer switches, accessories, generators and other products for commercial and industrial applications. In addition, the company provides state-of-the-art tools and educational programs for industry professionals.

Known as one of North America’s largest suppliers of power generation equipment, Generac Industrial Power has 50+ years of experience, integrated equipment and communication software, and generators.

Generac provides a wide range of 10 kW-30 kW to 1250 kW+ diesel generators built dependable for the toughest applications. In addition, in-house manufacturing and testing of every aspect ensures durability and reliability.

Generac diesel generators include (but are not limited to) the following:

• 10 kW Diesel Generator

• 30 kW Diesel Generator

• 400 kW Diesel Generator MPS

• 600 kW Diesel Generator MPS

• 800 kW Diesel Generator

• 900 kW Diesel Generator

• 1000 kW Gemini Diesel Generator

• 1250 kW Diesel Generator

• 1500 kW Diesel Generator

• 2000 kW Diesel Generator

• Protector Series 50 kW Diesel Generator

Generac’s diesel-fueled generators are known for easy maintenance, tolerance to dirty fuel, and excellent endurance in the harshest environments. Besides diesel generators, Generac provides natural gas generators for several applications—from assisted living centers and convenience stores to office buildings and schools.

Furthermore, Generac’s Industrial Distributor Network and in-house technical experts help customers with sizing, specs, and installation.

Kohler Power Systems, Inc.

Founded: 1920

Location: Kohler, Wisconsin, United States

Founded by John Michael Kohler, Kohler Co. (Kohler or KOHLER) is a well-established diesel generator company, that is best known for its plumbing products and also for cabinetry, engines, furniture, and generators.

Kohler Co. is the parent organization of Kohler Power Systems, Inc., which manufactures and markets generators for industrial, marine, mobile, and residential applications.

Kohler’s acquisition of SDMO created one of the world’s largest industrial generator manufacturers with 800+ locations worldwide.

Kohler manufactures a wide range of industrial gensets for standby, prime, and energy management applications. Kohler also offers marine, mobile, home, and portable generators apart from genuine spare parts and service.

KOHLER® Diesel Generators

Kohler’s diesel generator sets and their components are prototype-tested, factory-built, and production-tested, apart from complying with EPA (Environmental Protection Agency) emergency stationary emissions requirements.

Kohler provides more than 60 models of diesel generators—ranging from 10 kW to 4 MW—and is available with various KOHLER Decision-Maker® controls for basic, advanced, and paralleling requirements.

KOHLER® diesel generators are built for various applications, such as airports, commercial buildings, data centers, gas stations, and hospitals. The company also offers massive power options up to 4 MW with its KD Series generators known for their high fuel efficiency and performance.

KOHLER® diesel generators include (but are not limited to) the following:

• 15REOZK

• 80REOZJF

• 150REOZJF

• 200REOZJF

• 400REOZJD

• KD900

• KD2000

• KD2250

• KD2800

• KD4000

KOHLER® diesel generators meet stringent industry testing and quality standards and come with accessories, such as:

• Block heaters

• Fuel tanks

• Heavy-duty air cleaners

• Motor-starting alternators

Yanmar Co., Ltd. (Yanmar Holdings Co., Ltd.)

Founded: 1912

Location: Kita-ku, Osaka, Japan

Founded by Magokichi Yamaoka, Yanmar Co., Ltd. (Yanmar) is one of the well-established generator engine brands with a comprehensive product portfolio—from off-road gas engines and rice transplanters to generators and propulsion engines.

Yanmar’s founder is said to have developed “the world’s first compact diesel engine.”

The leading diesel engine, agricultural, and heavy machinery manufacturer became a holding company in 2002.

Yanmar’s diesel generators include:

•  

• YDG2700N (2.7 kVA)

•  

• YDG3700V-Y12 (3.3 kVA)

•  

• YDG3700N-Y12 (3.3 kVA)

•  

• YDG5500V-Y12 (3.3 kVA)

•  

• YDG5500N-Y12 (3.3 kVA)

•  

• YDG3700N (3.7 kVA)

•  

• YTB5.0S (5.0 kVA)

•  

• YTG5.0S (5.0 kVA)

•  

• YDG5500N (5.5 kVA)

•  

• eG55N (5.8 kVA)

•  

• YTG6.5S (6.5 kVA)

•  

• YTG6.5T (6.5 kVA)

•  

• YDG6600TN (6.6 kVA)

•  

• eG100i (7.5 kVA)

•  

• YTG0.0T (9.0 kVA)

•  

• YTG10S (10.0 kVA)

•  

• eG140i (11.0 kVA)

•  

• YEG140_Single phase (11.0 kVA)

•  

• YTG12.5T (12.5 kVA)

•  

• YEG140_3-phase (14.0 kVA)

•  

• YTG15T (15.0 kVA)

•  

• YH170_4pole_3-phase (16.5 kVA)

•  

• YH220_4pole_3-phase (23.1 kVA)

•  

• YH280_4pole_3-phase (28.4 kVA)

•  

• YEG_2pole_Single phase (34.3 kVA)

•  

• YH440_4pole_3-phase (44.4 kVA)

•  

• YEG_2pole_3-phase (45.2 kVA)

•  

• YEG_4pole_Single phase (54.3 kVA)

•  

• YH550_4pole_3-phase (54.7 kVA)

•  

• YEG_4pole_3-phase (74.0 kVA)

Here are the key features of YANMAR diesel power generators:

• Durability

• Easy maintenance

• Fuel efficiency

• User-friendliness

Apart from diesel/gas generators, Yanmar provides diesel pumps, diesel welders, and diesel lighting towers.

In addition to the companies listed above, other diesel generator makers have established a strong presence in the global market with a broad range of generator offerings.

For example, John Deere provides a diverse range of gasoline generators that are not only used by small property and business owners for backup electrical power but also by contractors and large property owners as virtual power plants.

Volvo Penta is another leading Swedish marine and industrial engine manufacturer supplying engines and complete power systems for marine and industrial applications.

Conclusion

The global diesel generator market is expected to grow significantly due to key drivers, including:

• Growing demand for diesel gensets due to frequent power outages

• Increasing demand for gensets in manufacturing industries

• Rapid development of industrial infrastructure

• Rise in global steel production, which relies heavily on diesel generators

• Rise in the demand for continuous and reliable power supply across different sectors like agriculture, construction, healthcare, O&G, and mining.

Diesel generators are available in various electrical and physical configurations and are built to global quality standards. For example, diesel generators are required to adhere to emissions standards, such as the EPA tier 4 emissions standard for diesel generators.

Global diesel generator manufacturers provide a variety of economical and efficient diesel generators and related products to ensure uninterrupted power supply for commercial, residential, and industrial users.

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