CORPORATE SUMMARYGLOBAL ENGINEERING FOR SOCIETY

TDS supports clients with reliable
technology and services thatcreate trust and security.
Tokyo Densetsu Service Co., Ltd. (TDS) wasestablished in 1979 as a wholly owned subsidiary of
TEPCO* Power Grid Inc., and has served an
important role in the stable supply of electricity
essential for social and economic activity.
Our management vision—to become a global
engineering company for infrastructure facilities
that support society—is based on the technology
and trust we have cultivated over many years.
With a focus on prioritizing safety and quality,
we provide a comprehensive range of services, from consulting to design,
construction, inspection and diagnosis, monitoring and control, and evenhuman resource development, for a wide range of facilities that supportsocial infrastructure. This encompasses electrical facilities, civil engineeringand concrete structures, steel structures such as bridges and steel towers,
and renewable energy facilities to contribute to making Japan acarbon-neutral nation. TDS’ objective is to remain the first choice when it
comes to facility support. We will accomplish this by taking on new
challenges and continuing to provide services that surpass customer
expectations, thereby supporting safety and comfort for everyone.
* TEPCO - Tokyo Electric Power Company Holdings, Incorporated

Takashi Oishi
President

One-stop solution
We provide total services that take into accountthe entire life cycle, including consulting,design, construction, and maintenance.

Human and financial
resources
Through our own training
facilities and development
programs, we carefully develop
engineers who excel in terms ofsafety awareness, technology,
and on-site responsiveness.

2

Technical prowess

Why choose
TDS?

We solve our customers'
problems by acquiring
manufacturer's licenses andleveraging the comprehensive
capabilities of professionals ineach infrastructure
specialization.

Extensive experience

Priority on safety

Our vast experience in supporting
TEPCO’s distribution facilties, whichboast the world’s highest level ofquality, delivers peace of mind to
our customers.

We implement risk management
based on past experience andensure safety is given first priority
in construction.

3

TDS Network

Our network, which extends from the Tokyo
metropolitan area to the entirety of Japan,
provides security and comfort.
TDS has established a service network of 19 locations nationwide,
mainly in the Tokyo metropolitan area. We bring together the skills andexperience of professionals who are well versed in specialized fields
such as substations, grids, civil engineering, underground, powertransmission, and chemical analysis, to quickly respond to customer
requests and inquiries. As professionals in electric power, TDS delivers
comprehensive safety measures and meticulous on-site support.

Fukushima
Niigata

Tochigi

NaganoGunma
Ibaraki

Osaka
Saitama
YamanashiTokyo
Kanagawa

Shizuoka

4

Chiba

Company Overview

Services

Company name:Tokyo Densetsu Service Co., Ltd.

Established:

September 10, 1979

Capital:￥50 million

Employees:

949 (as of March 31, 2024)

Sales:￥30.3 billion (fiscal year 2023)

・Construction and work for the maintenance of power
generation, transmission, and substation equipment
・Analysis, testing, diagnosis, drawings, andmaintenance of power generation, transmission, andsubstation equipment
・Operation and monitoring of electrical equipment
・Manufacture, purchase, and sales of electricalequipment
・Construction businessDirectors

・Surveying business, construction consultancy
business

President

Takashi Oishi

Managing Director
General Manager, Customer Business
Headquarters
Chief KAIZEN Officer
Head of Information Management

Toyoshi Tsukamoto

Director
General Manager, Substation Business
Headquarters
Chief Executive for Managing
Construction Operations

Hiroaki Hashimoto

Director
Head of Fukushima
Reconstruction Promotion
Head of Laws and Ethics

Kazunori Hamada

External Director

Ikuko Sato

External Director

Takamitsu Eguchi

・Maintenance and management of air-conditioning,disaster prevention, and electrical equipment forbuildings, as well as building cleaning andsecurity services
・Building Design and Construction Supervision
・Worker dispatch services
・Planning and implementation of training and public
relations related to power equipment technology
・Business related to each of the preceding items

Organizational Chart
President

AuditorManaging Director/Director
Safety and Quality Control/
Audit Office

Corporate Planning Department

Business Innovation Promotion
Department

Sales Department
Substation Technology Center
Analysis & Diagnosis Center

General Affairs Department
Design Center
Human Resource &Technology Development Center
Customer Business
Headquarters

Northern Construction Center
Southern Construction Center
PCB Detoxification Treatment
CenterWest Japan Office
Fukushima Works
Green Transformation (GX)
Business Promotion
Department

Tochigi OfficeGunma Office
Ibaraki Office
Saitama Office
Chiba OfficeArakawa Office

Civil Engineering Technology
CenterShinjuku Office

Green Transformation (GX)
Construction Management
Department
Substation Business
Headquarters

Civil Engineering &Maintenance CenterTama Office
Underground TechnicalEngineering Center

Kanagawa OfficeConstruction Management
Department

Yamanashi Office

Civil Engineering Business
Headquarters

Cable Maintenance Center

Underground Structure
Business Headquarters

Cable Tunnel & Duct
Maintenance Center

Power System Engineering
Business Headquarters

Power System Engineering
CenterShinano Office

Power System Operation
Technical Engineering Center

Niigata Office

Steel Construction Engineering
CenterNumazu Office
Fukushima OfficeProtection & Control System
Production Center
Monitoring Center

5

Business Overview

TDS’ service area is constantly expanding,enabling us to work closely with more
and more customers to solve their problems.
TDS started with the maintenance of power distribution facilities. Since then, utilizing theadvanced technology and abundant know-how cultivated through the maintenance offacilities that boast the world's top level of power quality, we provide one-stop
comprehensive services ranging from consulting, design, construction, inspection anddiagnosis to monitoring and control in a wide range of areas. This includes electrical facilities
that support social infrastructure and daily life. Above all, TDS works closely with customers
to deliver optimal solutions.

Service■ Power equipment maintenanceInspection, diagnosis, repair, and construction of substation equipment such as circuit
breakers, transformers, and protective relays
Inspection, diagnosis, repair, and construction of civil engineering facilities such as
dams, waterways, and iron pipes at hydroelectric power plants
Inspection, diagnosis, repair, and construction of underground power transmission
facilities including cables, conduits, and underground tunnels
Diagnosis and painting of power transmission equipment such as steel towers
Inspection, diagnosis, repair, and construction of communication facilities including
radio towers
Preparation of technical materials for power system grid operation
Support for the development of power system operators through training and drills

6

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■ Electrical and cable■ Infrastructure facilities■ Products

Inspection of Special High-Voltage Power Receiving
and Transforming Equipment

Steel structure maintenance

General Electric (GE)-made intellgent electronic
devices (IED), FITCAP, and more

Concrete structure maintenance

Renewal, renovation, and new installation of powercollection and transforming equipment

Wire rope maintenance

Equipment monitoring solutions■ Renewable energy

PCB detoxification treatment
Comprehensive power system operation service

Renewable energy power plant construction

Comprehensive cable and conduit facility service

Renewable energy power plant maintenance■ Training and seminars
Electrical equipment engineer training school, and more

Installation and maintenance service forbattery storage systems
Service page

7

History
1979: Established Tokyo Densetsu Service Co., Ltd.
1980: Launched contracted inspection of underground power transmission facilities
1982: Started receiving orders for facility inspections from companies other than TEPCO
1983: Launched contracted support for power system grid operation
1987: Established Oku Technical Training Institute(currently the Human Resources and Technology Development Center)
Human Resources and Technology
Development Center

1989: Transferred electronic communications maintenance operations to Tokyo Telecommunications
Network Co., Inc.
1994: Opened the TDS Technical Skills Training Center(currently the Human Resources and Technology Development Center)
2001: Split television business into TEPCO Cable Television Inc.
2002: Moved headquarters to Daimon 2-chome, Shiba, Minato Ward
2004: Acquired ISO 9001 certification (quality management system)

Protection and Control Manufacturing Plant(GE-made IED)

2005: Acquired ISO 14001 certification (environmental management system)
2009: Transferred operations related to hydroelectric power generation and transmission to TEPCO
2010: Moved headquarters to Daimon 1-chome, Shiba, Minato Ward
2012: Concluded GE (General Electric Company) IED agency agreement
2013: Moved headquarters to Higashi Ueno, Taito Ward
2017: Registered as a Photovoltaic System Maintenance and Inspection Contractor under the Japan
Electrical Safety & Environment Technology Laboratories (JET) certification system

Registered as a Photovoltaic System
Maintenance and Inspection Contractor under
the JET certification system

2018: Opened the Human Resources and Technology Development Center(relocation and expansion of the former TDS Technical Skills Training Center)

ISO Certification

Corporate Social Responsibility (CSR)

In all of our businesses, including design, construction,
manufacturing, and sales, we operate a QE (quality and environment)
management system based on ISO 9001 and ISO 14001. We are
striving to achieve both the industry's highest level of operational
quality and a reduction in the environmental impact of our operations.
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In the course of our business activities as a global engineering
company for infrastructure facilities that support society, we areworking to improve our safety management system and reduce ourenvironmental impact, with the aim of realizing a better, moresustainable society.
Compliance

Promotion ofdiversity
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Acquired certiﬁcationin December 2005

TDS
Initiatives

Environmental
initiatives

Safety initiatives

Quality initiatives
CSR pageAwards2023: Won 68rd Shibusawa Award in recognition of invention and ingenuity, design, and construction
2020: Won 65th Shibusawa Award in recognition of years of service to electrical safety
2019: Won 67th Electrical Science and Engineering Promotion Award
2018: Won 63rd Shibusawa Award in recognition of invention and ingenuity, design, and construction
2017: Won 65th Electrical Science and Engineering Promotion Award…and many other awards.

Awards page

Licenses and Registrations
Licenses

Registrations● Construction Business License● Electrical Construction BusinessSpecial Construction Business License
・Electrical contracting business・Civil engineering business・Scaffolding and excavation business・Painting business・Steel structure contracting business
Licensed by the Minister of Land, Infrastructure,
Transport and Tourism (Special-3) No. 11158
Building Construction Industry
Licensed by the Minister of Land, Infrastructure,
Transport and Tourism (Special-4) No. 11158
General Construction Business・Telecommunications construction business
Licensed by Minister of Land, Infrastructure,
Transport, and Tourism (General-5) No. 11158● Worker Dispatching Business License
Licensed by the Minister of Health, Labor andWelfare No. 13-309942● Antique Dealer
Saitama Prefecture Public Safety Commission
No. 431350051577

8

Minister of Economy, Trade, and Industry Notification
No. 18003● First-Class Architect Office
Tokyo Governor Registration No. 65820● Surveying business
Minister of Land, Infrastructure, Transport andTourism Registration No. (2) - 35346● Construction consultancy business
Minister of Land, Infrastructure, Transport andTourism Registration (Ken 04) No. 10525● Measurement certification business
Concentration of substances in water and soil
Tokyo Metropolitan Government Measurement andTesting Office No. 1397

● JET Photovoltaic System Maintenanceand
Inspection Certification (JET PV O&M Certification)JET PV O&M 17002

New Technology Information System(NETIS) registration● Corrosion prevention method forhanger rope anchorage
KK-130002-A April 25, 2013
(publication period expired October 2019)● STTG method
KT-140103-A January 21, 2015
(publication period expired February 2020)● Surface impregnation method
using lithium nitrite(Procon Guard System S)
CG-190024-A February 19, 2020

● FITCAP
KT-220158-A December 8, 2022

Patents
Wire rope anti-corrosion agent press-fitting method andapparatus for wire rope

Patent No. 5255516

Corrosion prevention method for bolts and bolt caps

Patent No. 6893497

Hydraulic steel pipe thickness measurement method

Patent No. 4663476

Charging measurement device

Patent No. 6898184

Patent No. 4956322

Rope-like object observation device and image
editing device

Patent No. 6925876

Patent No. 5300162

Switching-device remaining lifetime diagnosis method of
insulating tape

Patent No. 6947587

Patent No. 5945442

Structure preservation method and structure
preservation device

Patent No. 7220253

Thermoplastic resin coating method and apparatus

Patent No. 5973687

Electrochemical anti-corrosion structure and electrochemicalanti-corrosion method for concrete structures

Patent No. 7270918

Insulating oil extraction and analysis method

Patent No. 6032778

Cable repair method and cable repair structure

Patent No. 7281995

Methods and equipment for maintenance managementof rope-like structures

Patent No. 7323380

Protective devic

Patent No. 7347952

Anti-corrosion treatment method for suspension cables

Patent No. 7402903

Cylindrical object painting device

Patent No. 7488713

Water-tree ion analysis method
Water sealing agent, water sealing method, andinjection apparatus
Rebar stress measurement method

Oil-impregnated resin film remaining life diagnosis
methodPatent No. 6051276

Oil-filled cable copper sulfide formation estimation
method using insulating oil analysis and diagnosing thedegree of danger

Patent No. 6609134

Structural member stress evaluation method

Patent No. 6703932

Oil-filled cable organic copper compound and copper
sulfide formation estimation method using insulating oil
analysis, and method for diagnosing the risk ofabnormal occurrences in oil-filled cables

Patent No. 6832728

National Qualifications (Japan)
Professional Engineer (construction)

5

Class B Fire Defense Equipment Officer (Class 1 to Class 7)

Associate Professional Engineer (construction)

5

Class A Hazardous Materials Engineer

164

Associate Professional Engineer (electrical/electronics)

2

Class B Hazardous Materials Engineer (Class 1 to Class 6)608Energy Manager (electrical and heat)

8

Class 1 Inspector of Fire Protection Equipment and Systems

112

First-Class Chief Electrical Engineer

4Class 2 Inspector of Fire Protection Equipment and Systems

118

Second-Class Chief Electrical Engineer

25

Operations Chief of Oxygen Deficient/Hydrogen Sulfide Danger

420

Third-Class Chief Electrical Engineer

111

Registered Surveyor

5First-Class Electrical Contracting Works Execution Managing Engineer

121

Assistant Surveyor

35

Second-Class Electrical Contracting Works Execution Managing Engineer

80First-Class Civil Engineering Works Execution Managing Engineer

81First-Class Electrician

173

Second-Class Civil Engineering Works Execution Managing Engineer

55

Second-Class Electrician

342

4First-Class Architect

3

Noise-Related Pollution Control Manager

2

First-Class Plumbing Works Execution Managing Engineer

4Vibration-Related Pollution Control Manager

3

Second-Class Plumbing Works Execution Managing Engineer

2

Certified Environmental Measurer (concentration-related)

2First-Class Architectural and Construction Works Execution Managing Engineer

1Class-1 Boiler Expert

2

Chief Dam Management Engineer

4Class-2 Boiler Expert

35

Steel Infrastructure Diagnosis Engineer

2Class 2 Refrigeration Safety Manager

2

Steel Infrastructure Inspection Engineer

9Class 3 Refrigeration Safety Manager

29

Concrete Diagnostician

3

Crane Operator

54

Category-1 Health Officer

58

Class A Fire Defense Equipment Officer (Class 1 to Class 5)

22*As of March 31, 2024

Offices and Facilities● Headquarters● Training Facilities

MPR Higashi-Ueno Building, 6-2-1 Higashi-Ueno, Taito Ward, Tokyo 110-0015
TEL: +81-3-6371-3000

Human Resources and Technology Development Center
2-536 Suzuya, Chuo Ward, Saitama City, Saitama 338-0013
Human Resources and Technology Development Center (Tamagawa)
2-8-1 Tamagawa, Ota Ward, Tokyo 146-0095● Offices
Tamagawa Center
2-8-1 Tamagawa, Ota Ward, Tokyo 146-0095

Kanagawa Office463-1 Totsukacho, Totsuka Ward, Yokohama City, Kanagawa 244-0003

Tochigi Office281-2 Ichinosawamachi, Utsunomiya City, Tochigi 320-0049

Yamanashi Office
4-24-2 Ise, Kofu City, Yamanashi 400-0856

Gunma Office325-1 Ishihara, Shibukawa City, Gunma 377-0007

Numazu Office1015-4 Nakatogari, Nagaizumi Town, Sunto District, Shizuoka 411-0942

Ibaraki Office
1-22-5 Shinhara, Mito City, Ibaraki 310-0045

Fukushima OfficeGospel Building 1F, 1-70 Hinokimachi, Aizuwakamatsu City, Fukushima 965-0008

Saitama Office
5-19-20 Shimoochiai, Chuo Ward, Saitama 338-0002

Shinano Office
1-1-20 Ote, Matsumoto City, Nagano 390-0874

Chiba Office
1-17-11 Kita-honcho, Funabashi City, Chiba 273-0864

Niigata Office180-1 Shimofunato, Tsunan Town, Naka-Uonuma District, Niigata 949-8201

Arakawa Office
1-38-16 Machiya, Arakawa Ward, Tokyo 116-0001

West Japan Office
Shin-Osaka Rose Building 403, 5-12-8 Nishi-Nakajima, Yodogawa Ward, Osaka City, Osaka 532-0011

Shinjuku Office
3-6-12 Takadanobaba, Shinjuku Ward, Tokyo169-0075

Fukushima Works
Maison MAST Iwaki 1F, 1-1 Nittamae, Taira, Iwaki City, Fukushima 970-8026

Tama Office
4-9 Takakuramachi, Hachioji City, Tokyo 192-0033

9

■ Please feel free to contact us for further information.

MPR Higashi Ueno Building, 6-2-1 Higashi Ueno
Taito-ku, Tokyo 110-0015

TEL: 03-6371-3000
https://www.tdsnet.co.jp/

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