Meidensha: Creating a better future with our people and technology.


This content is a reprint of "Meidensha: Creating a better future with our people and technology"
that was posted in the Nikkei Online Edition from December 2017 to January 2018.

This content is a reprint of "Meidensha: Creating a better future with our people and technology"
that was posted in the Nikkei Online Edition from December 2017 to January 2018.

Meidensha: Creating a better future with our people and technology.


Stage1 Powering the excitement.:A decisive, must-win contest that will open the road to the world. Events held here are supported by a reliable and efficient power generation system.

Saitama Stadium 2002 (in Saitama-shi) is the largest soccer stadium in Japan. It has also been the site of decisive, must-win contests to qualify for the world cups. While cheers and fevered excitement fill the stadium during games, there is a cool, tense atmosphere in one spot. This is the private generator room, installed under the audience seating area.

So Ishihara
So IshiharaPGP Engineering Department
Power Generation Products
Business Unit
Meidensha Corporation

So Ishihara, an electric power generation engineer at Meidensha who was in charge of constructing the stadium's power generation system, explains the reason for this tense atmosphere: "During a game, the electrical load is about six times as high as when there isn't a game. Careful management is needed because no disruptions can be tolerated." The stadium has a contract with the electric company to receive up to 1500 kilowatts, but when there isn't a game, power consumption is only about 500 kilowatts. The stadium usualy operates with the minimum contracted electric power supply, but it uses up to 3000 kilowatts on game days, with extra 1500 kilowatts supplied from private power generation. "The system is designed to avoid unnecessary electric power consumption, but any equipment malfunction could have an impact on holding a game," Ishihara adds.

The stadium's power generation system uses cogeneration (combined heat and power supply). The heat that is generated by using an engine to generate electricity is recovered and used efficiently for purposes such as air conditioning. "In most cases, the majority of the energy produced by an engine is waste heat that goes unused, but cogeneration systems instead make use of this heat, increasing the efficiency to 70–80%."

In Japan, double-digit economic growth is a thing of the past, and the population has begun to decline. In a mature society, public facilities need to provide not only safety and reliability, but also efficiency. The efficient operation of large-scale facilities such as stadiums is one of Meidensha's solutions to address the needs of today's society for saving energy and reducing carbon dioxide emissions, but for this, it is not enough just to deliver the equipment. Ishihara explains, "We make the generator and control panel by ourselves, but we have the engines, air conditioning, lighting, and other equipment supplied by other companies. To achieve efficiency as described in the catalog, we have to optimize the overall electric power system, which requires cooperation with other companies as well as within our own company." Meidensha's professional capabilities in the field of electricity allow entire system integration and bring out the fullest systems' capabilities, which supports the "power for excitememt " that is also environmentally friendly.

Saitama Stadium 2002 hosting a football match

Reliability in 16 years of trouble-free operation; On-site maintenance and inspection capabilities that enable stable long-term utilization.

Even the highest quality equipment will have varying states in day-to-day operations. On-site protective maintenance is indispensable for trouble-free operation. Response has to be quick. Kenta Umezaki, who works in maintenance and inspections at the Kita-Kanto Branch of Meiden Engineering Corporation, has been assigned to Saitama Stadium for over a year. "I always attend international games and am be prepared to respond in case of a power outage or other emergency. Even if the game starts at 7 PM or later, I arrive at least five hours earlier to check that the cogeneration system is operating properly and to monitor the temperature," Umezaki states.

Prior preparation is required during work on days when there are no games. We diagnose the equipment while no problems are evident and make proposals to the Stadium regarding ad-hoc maintenance and equipment replacement. It is here that we take advantage of the accumulated knowhow of the Meiden Group. Umezaki says, "Because we share information throughout our offices around Japan, even in a situation encountered for the first time, we can respond quickly by taking advantage of the Group knowledge." According to statistics from the Ministry of Economy, Trade and Industry, electrical accidents caused by equipment malfunction are only a small percentage of the total. About 30% are due to maintenance issues. Behind the 16 years of continuous trouble-free operation of the Saitama Stadium equipment lies the maintenance capabilities of the Meiden Group.

Kenta Umezaki
Kenta UmezakiMeiden Engineering Corporation
Regular maintenance work supports the game
Regular maintenance work supports the game
Continuous maintenance work supports the game

Always keeping the final consumers in mind; Working with a sense of mission to support facilities that protect lives and health.

Meidensha's social infrastructure business, which supplies electrical systems to public facilities, is involved in a wide range of fields. It has delivered equipment to all sorts of places, including local government facilities, broadcasting stations, and private commercial buildings in addition to facilities operated by the national government such as government buildings in Kasumigaseki, defense-related facilities, and roads. Meidensha has delivered a great deal of power generation equipment, including cogeneration, to medical institutions, which becomes increasingly important with the aging population. Ishihara, a power generation engineer, comments, "When I am in a hospital for trial operation of equipment, I sometimes go through patient areas. As I pass by patients, I am always reminded of the responsibility and importance of my work that contributes to work that supports lives and health."

"Most people may not be very aware of what Meidensha does," muses Kazuhide Yoshikawa, deputy director of infrastructure system sales division. "However, I expect that almost everyone has visited a facility that uses our products. Just about everyone in Japan is one of the final users of our products." Although the infrastructure business is based on a typical B2B (business to business) approach, it is also a business where the needs and characteristics of consumers have to be clearly understood.

Kazuhide Yoshikawa
Kazuhide YoshikawaPublic, Private &
Nuke Sector Sales Division
Public, Industrial & Commercial
Sector Business Unit
Meidensha Corporation


Meidensha is a manufacturing company that develops and produces electric power generation equipment, etc. However, Yoshikawa stresses, "That alone is not enough. We are constantly thinking about how infrastructure can provide solutions to problems in society and enrich the life of each individual." In addition to producing and delivering equipment, it is important to help improve energy efficiency in the society as a whole through products and technologies. Expectations are high for Meidensha's continued efforts to provide solutions for infrastructure, carrying on its founder's vision of "leading the way to a brighter future with the power of electricity."

Case Study of our Power generation systems

Examples of power generation projects supported by Meidensha

Explanation of terms.

Cogeneration system.
A system that generates electricity with the use of engines and turbines and at the same time, recovers heat generated by the engines and other components for use in air conditioning and hot water supply. Such system is also called a "combined heat and power supply system" because it supplies heat and electricity at the same time. Cogeneration is used in private power generation systems in hotels, hospitals, factories, and other facilities that need steam or hot water as well as electric power. In general, only about 40% of the energy generated by engine operation can be used in the form of electricity, and the remaining energy is lost as waste heat. However, cogeneration systems utilizes 30–40% of the energy in the form of heat, bringing the overall efficiency rate of the combined use of energy to 70–80%.
Cogeneration system
*Honorifics omitted.

Meidensha: Creating a better future with our people and technology.

  • Stage1 Powering the excitement.
  • Stage2 Protecting water resources and infrastructure that nurture the community.
  • Stage3 Driving force for a new automotive era.
  • Stage4 Pursuing greater safety and stability in railway transportation.
  • Stage5 AI for water treatment protection
  • Stage6 Efficient energy management.
  • Stage7 Lightning Protection.
  • Stage8 IoT to protect from heavy rain.
back to the top