Vertical general backup power generator for power outagesLP gas general backup power generator for power outagesOther power generation equipmentPower supply vehicleDocking power generatorVehicle-mounted power generatorGasoline engine welding machineDiesel engine welding machineBattery welding machineCompressorGeneratorWelding machineSpecial equipmentPortable diesel generator (DCA series/TLG series)Generator with pre-operation check function (G-doctor)Ultra-low noise type (US series)Quiet generator Marielle[Three-phase and single-phase simultaneous output] DCA-D series[Three-phase] 13–100kVA class[Three-phase] 125–400 kVA class[Three-phase] 500–1100 kVA class[Three-phase] Aircraft with secondary standard engineTwo-pole type (TLG series)[Single-phase] DCA-LSX/ESX seriesPortable / small generatorPortable gas generatorSmall gasoline generatorSmall diesel generatorHybrid power generatorEmergency self-generated power equipmentUrban gas (13A) emergency generator (for safety)Disaster prevention power equipmentVertical disaster prevention power equipmentGAW-135GAW-155ESGAW-190ES2DLW-200×2LSEDLW-200×2LSDLW-320LS2DLW-300LSEDLW-300LSW2Special Engine Welding Machine (TIG/CO2/Self-shield/Plasma)Variable Pressure & Variable Capacity TypeStandard TypeBuilt-in Aftercooler TypeDry Air TypeMotor CompressorSpotlightHigh-Altitude Work VehicleTurning RollPower Source
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Denyo America Corporation
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Denyo Asia Pte. Ltd.
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Denyo Europe B.V.
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Denyo Manufacturing Corporation
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Denyo Vietnam Co.,Ltd.
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Dein Prima Generator Ltd.
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| Denyo Group |
1948 (Showa 23)
Established Nihon Electric Welding Equipment Co., Ltd. in Nyuushimachi, Tokyo (now Shintomicho)
July: Established NEC Welding Equipment Co., Ltd. in Tokyo Irimachi (now Shinmachi)
1959 (Showa 34)
Developed and began production of the country's first high-speed engine welding machine
March: Developed and began production of Japan's first high-speed engine welding machine
1961 (Showa 36)
Saitama plant completed; began production of engine generators
December: Completed Saitama factory and began production of engine generators
1966 (Showa 41)
Developed noise suppression device and adopted it in engine generators and engine welding machines
February: Developed noise suppression device and adopted it for engine generators and engine welding machines
Renamed company to Denyo Co., Ltd.
July: Renamed company to Denyo Co., Ltd.
1970 (Showa 45)
Shiga plant completed; began production
July: Completed Shiga factory and began production
1973 (Showa 48)
Began production of engine compressors
April: Started production of engine compressors
1976 (Showa 51)
Established joint venture P.T. Denyo Indonesia (now P.T. Dein Prima Generator) in Indonesia
March: Established a joint venture in Indonesia, P.T. Denyo Indonesia (now P.T. Dein Prima Generator)
Fukui plant completed, operations commenced
April: Completed Fukui plant and began operations
1981 (Showa 56)
Established a joint venture with local capital in Singapore, United Machinery Services Pte. Ltd. (now Denyo United Machinery Pte. Ltd.)
May: Established a joint venture with local capital in Singapore, United Machinery Services Pte. Ltd. (now Denyo United Machinery Pte. Ltd.)
New Saitama plant completed, relocation finished
1982 (Showa 57)
January: Completed the new Saitama plant and completed relocation
1983 (Showa 58)
Listed on the Second Section of the Tokyo Stock Exchange
February: Listed on the Second Section of the Tokyo Stock Exchange
1984 (Showa 59)
Entered the water-related equipment field; began development and production of high-pressure water pumps and wastewater pipe cleaning devices as the first product
May: Entered the water equipment field, developing and starting production of high-pressure engine water pumps and wastewater pipe cleaning devices as the first product
1988 (Showa 63)
Developed and began selling cogeneration systems and UPS devices; acquired shares of D.B.S. Co., Ltd. (now Denyo Kousan Co., Ltd.)
Entered new business, developed and began selling cogeneration systems and UPS. Acquired shares of D.B.S. Co., Ltd. (now Denyo Kousan Co., Ltd.)
April: Entered new business, developing and selling cogeneration systems and UPS. Acquired shares of D.B.S. Co., Ltd. (now Denyo Kousan Co., Ltd.)
1991 (Heisei 3)
Entered the high‑altitude work vehicle field; began sales
October: Entered the high‑reach vehicle field and began sales
1992 (Heisei 4)
Established subsidiary Denyo America Corporation in the United States
December: Established subsidiary Denyo America Corporation in the United States
1995 (Heisei 7)
Announced the revolutionary new gasoline engine welding machine GAW series using permanent magnets
June: Announced the groundbreaking new gasoline engine welding machine GAW series using permanent magnets
Established joint venture Denyo Manufacturing Corporation in the United States
August: Established a joint venture in the United States, Denyo Manufacturing Corporation
1997 (Heisei 9)
Released new engine compressor series "DIS Series"
October: Released the new engine compressor series "DIS series"
Obtained ISO9001 at Fukui plant
December: Obtained ISO9001 at the Fukui plant
2000 (Heisei 12)
Listed on the First Section of the Tokyo Stock Exchange
March: Listed on the First Section of the Tokyo Stock Exchange
Established subsidiary Denyo Asia Pte. Ltd. in Singapore
June: Established subsidiary Denyo Asia Pte. Ltd. in Singapore
2003 (Heisei 15)
Closed Shiga plant and consolidated production at Fukui plant; Shiga plant became Shiga logistics center and Fukui sub‑factory
May: Closed the Shiga plant and consolidated production at the Fukui plant. The Shiga plant became the Shiga logistics center and a branch of the Fukui plant
2006 (Heisei 18)
Obtained ISO14001 at Fukui plant
October: Obtained ISO14001 at the Fukui plant
Moved headquarters to Nihonbashi Horidumacho, Chuo-ku
December: Moved headquarters to Nihonbashi Horidome-cho, Chuo-ku
2007 (Heisei 19)
Acquired shares and made Nishihatsu Power Generator Co., Ltd. (now Nishihatsu Co., Ltd.) a subsidiary
June: Acquired shares to make Nishihatsu Power Generation Co., Ltd. (now Nishihatsu Co., Ltd.) a subsidiary
Established Denyo Europe B.V. in the Netherlands
October: Established Denyo Europe B.V. in the Netherlands
2009 (Heisei 21)
Merged with Denyo Techno Service and Denyo Trading
July: Merged with Denyo Techno Service and Denyo Trading
2010 (Heisei 22)
Established subsidiary Denyo Vietnam Co., Ltd. in Vietnam
May: Established subsidiary Denyo Vietnam Co., Ltd. in Vietnam
2013 (Heisei 25)
Established a new Development Training Center in Sakado City, Saitama Prefecture
March: New Development Training Center established in Sakado City, Saitama Prefecture
2015 (Heisei 27)
Denyo Vietnam Co., Ltd. expanded its second factory and began production of engine generators
February: Denyo Vietnam Co., Ltd. expanded its second factory and began production of engine generators
2020 (Reiwa 2)
Established subsidiary Denyo Trading Vietnam Co., Ltd. in Vietnam
February: Established subsidiary Denyo Trading Vietnam Co., Ltd. in Vietnam
2022 (Reiwa 4)
Transitioned to the Prime Market of the Tokyo Stock Exchange
April: Moved to the Prime Market of the Tokyo Stock Exchange
2023 (Reiwa 5)
Established a new Kanto Service Center in Sakura City, Chiba Prefecture
March: New Service Center Kanto established in Sakura City, Chiba Prefecture
New headquarters factory of Nishihatsu Co., Ltd. completed and began operation
2025 (Reiwa 7)
January: New headquarters factory of Nishihatsu Co., Ltd. completed and began operation
January: TV commercial featuring Miwa Hamabe began airing
Established a new West Japan Service Center in Okayama City, Okayama Prefecture
April: New Service Center West Japan established in Okayama City, Okayama Prefecture
October: Back-strap battery welding machine WELZACK received the Good Design Award
Denyo Co., Ltd. will sponsor the special game "THE LAST GAME 2026," which serves as a retirement ceremony for professional baseball players. This event honors the achievements of players who have supported Japanese professional baseball for many years and celebrates the beginning of a new chapter in their lives.
Denyo Co., Ltd. will relocate its Kanazawa branch to 305-2 Gōmachi, Nonoichi City, Ishikawa Prefecture, effective November 2, 2026. With the relocation, the office area will expand to about four times the current office size, and the warehouse area will increase by about 1.8 times. The business start date is November 2, 2026.
Denyo Co., Ltd. will relocate its Kanazawa branch as of November 2, 2026. The new office area will be about four times the current office area, and the warehouse area will expand by about 1.8 times. The new address is 305-2 Gōchō, Nonoichi City, Ishikawa Prefecture.
Denyo received two Encouragement Awards at the 2026 (75th) Electrical Engineering Technology Achievement Awards for developing a portable fuel cell power generator. The awards mark three consecutive years. The 7kW unit achieved continuous operation through hydrogen container replacement, while the 3kW unit realized high maneuverability through miniaturization and lightness, and was praised for contributing to decarbonization of construction sites and improvement of working environments.
Denyo will launch tie‑up promotions such as special collaboration commercials, theater advertisements, and SNS giveaway campaigns in conjunction with the release of the film 'Godzilla-0.0' on November 3, 2026. The company's generators were used on set, and Denyo also provided materials to assist with the depiction of generators in the film. Denyo's logo will appear in the end credits as 'media cooperation'.
The phone line at the Fukui Plant has been unavailable since August 18, 2026. If you know the staff member's email address, contact them directly; otherwise, use the designated email address. The company apologizes for the inconvenience and appreciates your understanding and cooperation until service is restored.
Denyo donated ¥3 million through the Japanese Red Cross Society to support people affected by the 2026 Kumamoto earthquake. The company hopes for a swift recovery and reconstruction in the affected areas.
We extend our sympathies to those affected by the Kumamoto Earthquake. When using portable generators, it is essential to handle gasoline carefully and prevent carbon monoxide poisoning. Avoid using in poorly ventilated areas and check safety leaflets for guidance.
Denyō Corporation will close its main offices and sales locations from August 11 to 16, 2026. The Fukui factory and Shiga branch factory will be closed from August 8 to 16, resuming operations on the 17th. Inquiries during the holiday period will be responded to sequentially.