SERVICE CATALOGGLOBALENGINEERINGFOR SOCIETY

Resolving client issues,and securing trust and loyalty.
Tokyo Densetsu Service Co., Ltd. (TDS) is a global engineering company for infrastructure facilities that support
society, encompassing electrical and cable facilities, steel and concrete structures, and renewable energy
facilities. TDS works side by side with its customers to provide optimal solutions to a broad range of issues.

Human resource cultivation

Technical prowess and extensive
experience

We support the development of engineers
through training that emphasizes hands-on
experience using actual equipment.

TDS is a collection of professionals who have supported the electric
power distribution facilities of TEPCO Power Grid, Inc., which boasts
the world's highest level of quality. We possess the technicalcapabilities to deal with all kinds of manufacturers and a wealth ofexperience that enables us to resolve customer issues.

Monitoring and control
Utilizing the facility operation
know-how of electric powercompanies, we can handle
everything from monitoring tocontrol, including operation.

One-stop problem solving
We provide a comprehensive range of services for facilities that
support social infrastructure. Our service lineup includes everythingfrom consulting to design, inspection and diagnosis, maintenance,
monitoring and control, and human resource development.

Collaboration and teamwork
Our team comprises experts on power substations, power grids,
civil engineering, underground power transmission, and chemical
analysis. They pool their knowledge and work cooperatively todeliver the best solutions to our customers.

Proposing customized solutions
By utilizing its accumulated know-how, TDS provides customer-firstservices such as value-added maintenance and life cycle proposals.

Maintenance
Effective measures aimed at
reducing life cycle costs extend
the service life of facilities.

Inspection and diagnosis
TDS’ vast technical capabilities andexperience deliver high value-added
maintenance services.

2

Consulting
We leverage our knowledge
and advanced diagnostic
technologies in proposing
optimal solutions.

DesignWe specialize in usability-oriented design
based on our comprehensive know-howthat helps optimize facility operation.

Electricaland cable equipment

Material procurement

Renewable energy
facilities

Through our uniqueprocurement routes and cost
reduction methods, we offer
superior cost advantage.

Infrastructure
facilities

Construction

GLOBAL ENGINIEERINGFOR SOCIETY

We provide flexible construction
solutions to meet customer needs.
This includes relay design tomitigate damage in the event of an
accident or to minimize the timerequired to shut down equipment.

Index
Electrical and cable equipment

4

Inspection of power collection andtransforming equipment

6

Renewal, renovation, and new installationof substation equipment

8

Equipment monitoring solutions

Comprehensive cableand conduit facility service

10

Infrastructure facilities

14

Steel structure maintenance16

9Concrete structure maintenance18

PCB detoxification treatment

9

Wire rope maintenance

19

Comprehensive power system
operation service

9

Renewable energy facilities

20

Renewable energy
power plant construction

22

Renewable energy
power plant maintenance23

Products

24

Training and seminars

26

3

Electricaland cable equipment

Electrical and cable equipment

4

Inspection of power collection and6

Renewal, renovation, and new installation

8

Equipment monitoring solutions

9

PCB detoxification treatment

9Comprehensive power system

9Comprehensive cable and conduit

10

transforming equipmentof substation equipment

operation service

facility service

Electrical and cable equipment page4

Providing ideal solutions with the technology
and experience that have supported
the world's highest quality power facilities.
TDS provides a host of services, including inspection, construction, monitoring, control, and consulting for
power collection and transforming facilities, cable facilities, and their peripheral equipment. TDS is in tune
with the varied needs of its customers. Viewing the issue from the perspective of a facility user, TDS
proposes the optimal plan, such as a facility configuration that is easy to maintain after installation and amethod that meets strict facility shutdown conditions.

Spotlight on safety and security

We place a high priority on safety and security because we deal with electricity, which is invisible. And beyond
operational safety, we propose a system to limit the spread of the impact of spillover accidents in the event ofan emergency.

Advanced technology and vast experience

Through our experience in maintaining about 1,600 substations, over 6,000 kilometers of underground transmission
lines, and around 160 hydroelectric power plants for TEPCO Power Grid, Inc., we have accumulated a significant
portfolio of technologies and a wealth of experience.

High value-added solutions

Our objective is to provide maintenance services that preclude breakdowns and malfunctions, maximizing equipment
uptime. We achieve this by customizing maintenance plans taking into account customer needs and the surrounding
environment, and by proposing updates that consider the lifecycle of the equipment.

Introduction of new technologies

Initial stage of failure
Failure rates

Equipment
renewal cycle

We constantly adopt new technologies to help resolve customer issues. Examples include partial discharge
measurement technology that makes possible diagnosis without power interruption, remote monitoring and control ofelectrical equipment, and chemical analysis-based investigation and diagnosis technology.

Contingency failure period

Wear failure period

Recommended
time for renewal

New construction
and renewal

Renewalwarning period

Expected
life period

ServicelifeLife extension

RenewalAging

STEP 1Long-term renewal
plan proposal

Equipment
diagnosis

STEP

2Life extension repair andequipment partial renewal

STEP

Medium-term renewal
plan proposal

3

Propose and implement
equipment life extension

Equipment
renewaExtension of life
update proposal period

Maintenance and inspection (periodic inspection, repair)
Equipment
data extraction

Equipment diagnosis

STEP

4

Proposals for
implementation of renewal

Propose a renewal plan that considers the lifecycle

STEP

5

Implementation ofrenewal design work
STEP

6

Post-update operation
proposals

Facility management cycle

5Inspection of power collection
and transforming equipment

Supporting stable operations with high-quality inspections,and over 95% repeat customers.
TDS provides high-quality inspections for all types of manufacturers, particularly for special high voltage power collection
transforming equipment. We can also perform inspections on both special high-voltage and high-voltage facilities at once,
which has the advantages of simplifying ordering procedures and reducing costs.

Why choose TDS?
High value-added
inspection

Customized construction
methods

Our inspections that take into account equipment
lifecycles—including careful inspection anddata-based trend management—are highly
regarded, as evidenced by our customer repeat
rate of over 95%.

We offer flexible construction methods to suit
our customers’ requirements. This includes
minimizing facility shutdowns and short-term
inspections of large-scale facilities.

Simultaneous inspection of special high-voltage
and high-voltage power transforming equipment

BeforeAfter
Special high-voltage
equipment

Order tothemanufacturer

Simultaneous
inspection
OK

Order toCompany A

Order toCompany B

Substation (1)(high-voltage
equipment)

6

Substation (2)(high-voltage
equipment)

Substation (1)(high-voltage
equipment)

Our technicians, who benefit from technicalguidance from manufacturers and rigorous
in-house certification, provide unwavering
support with rich experience and reliable
technology.

Applicable facilities and equipment

This service is available for any manufacturer and can be used to inspect multiple pieces of equipment at once. Consolidating
inspections that were traditionally ordered separately brings advantages such as reductions in workload and costs.

Special high-voltage equipment

Extensive experience andsuperior technologicalcapability

Substation (2)(high-voltage
equipment)●Special high-voltage power collection
and transforming equipment (22kV to 154kV)●Simultaneous inspection of special
high-voltage power collection
and transforming equipment tohigh-voltage power collection
and transforming equipment

Main service menu
●Gas insulated switchgear inspection●Transformer inspection●Circuit breaker inspection●Cubicle inspection●Protective relay inspection●DC power supply inspection●Sequence test

Inspection of power collection
and transforming equipment

TDS diagnosis and repair technology
TDS specializes in special high-voltage power collection and transforming equipment. The company supports the safe,
secure operation of its customers’ facilities with high value-added technologies developed from on-site needs.
Insulation diagnosis using partial
discharge measurement
This is Japan's first practical technology for
diagnosing insulation performance and preventing
accidents by detecting the phenomenon of partial
discharge. Partial discharge is a localized faintdischarge that occurs when defects are present ininsulation. TDS’ proprietary technology reliably
detects indications of equipment abnormalities.
And equipment diagnosis is possible while in use,
without power stoppage.

Transforming equipment
external diagnosis

Storage battery deterioration
diagnosis

This technology enables the external diagnosis ofvarious types of equipment using a method that
does not involve monitoring the condition of theequipment during operation or disassembling theequipment. It is effective when there are restrictions
on stopping the equipment. It can quickly andeffortlessly identify signs of equipment abnormalities,
mainly for gas-insulated switchgear, disconnectors,
and bushings.

This diagnostic technology makes possible theinstant evaluation of the internal resistance,electromotive force, and actual capacity of each celland identifies degraded cells without interrupting
equipment operation. Since only the cells whose
actual capacity has decreased can be replaced, thiscontributes to extending the life of the entire facility,
reducing costs, and enhancing reliability.

CubicleDisconnector

Oil leak repair - Seam CoatThis reliable, long-lasting oil leak repair technology
boasts an oil leak prevention rate of 96% or more
and a service life in excess of 15 years. It
incorporates a proprietary method as well as Seam
Coat, an ultra-thin coating material featuring
superior resistance to oil, water, heat, and weather. It
is effective not only for oil leaks but also for leaks intransformers and other equipment used as SF6
gas-insulated equipment.

Circuit breaker

Power transformer

Cable

Battery

Investigation and diagnosis usingchemical analysis

Diagnosis of high-voltage cable
deterioration

TDS conducts chemical analysis from a third-party
perspective to investigate the cause of accidents,
diagnose power cable deterioration, and present fairand impartial diagnosis results. We can accurately
determine the cause of accidents from bothchemical and field points of view derived from ouraccumulated experience and know-how.

High-voltage cables are often the cause of spillover
accidents, so regular maintenance is essential.
Inspecting the equipment together with powercollection and transforming equipment has the meritof simplifying adjustments made during shutdown
and reducing on-site management costs. In addition
to the DC leakage current method, we also offer the
AC superimposing method, which allows fordiagnosis on an active line.

7Renewal, renovation, and new
installation of power collection
and transforming equipment

Leveraging specialized know-how and comprehensive capabilities
to realize the facilities that customers envision.
Power collection and transforming equipment construction requires specialized knowledge and comprehensive capabilities invarious fields, such as large equipment installation and removal, and the construction of power cables, overhead lines, andprotection and control equipment. TDS provides a one-stop service for a wide range of power collection and transforming
equipment work, focusing on special high-voltage electrical equipment for factories and buildings.

Why choose TDS?
Selection of
the best equipment

Extensive design
engineering capabilities

Support for peripherals

We can work with any manufacturer. Combining
the most suitable equipment for the customer's
facility type, we can achieve efficient facility
construction.

Our engineers, who have supported the world's
highest quality electric power facilities, willpropose an optimal construction plan that takes
into account the customer's facility configurationand operation.

In addition to the renewal of power collection
and transforming equipment, we also provide
one-stop services for peripheral equipment suchas power cables, protection relays, and steel
mounts.

Giving shape to customers' every need
Customer-first design

Emphasison quality

Safetymanagement
review
supportSelf-inspection
before use

Detailed
designElectricity
application

TDS isa one-stop
providerFull support fortroublesome tasks

Main service menu

Application to
government
offices

Excellent cost benefits

Pursuit of safety

Material
arrangement

Performance
testing
Construction
management

Experienced technicians available

8

Applicable facilities and equipment●From special high-voltage power collection
and transforming equipment to high-voltage
power collection and transforming equipment(6.6kV to 154kV)●Power cables for electric power (6.6kV to 66kV)●Other peripheral equipment such asprotective relays●Renewal, repair, and installation of special
high-voltage and high-voltage powercollection and transforming equipment●Replacement of power cables●Renewal, repair, and installation ofprotective relays●Renewal, repair, and installationof various types of power equipment

Equipment monitoring solutions
PCB detoxification treatment
Comprehensive power system
operation service

Equipment monitoring solutions

Next-generation equipment operation
saves labor.

Equipment monitoring solutions page

Strict monitoring and control of customer facilities at a monitoring
center with advanced security measures.* In addition to 24/7/365
monitoring of facilities, the system can also remotely control a variety
of devices, thereby addressing issues such as alleviating personnel
shortages and reducing workload.

*Meets Japan Electrotechnical Standards and Codes (JESC) Z004 (2019) "Guidelines for Power Control System Security".

PCB detoxification treatment (natural circulation cleaning treatment)

TDS handles everything, and the equipment
is back online in only two days!

PCB detoxification treatment page

A transformer containing trace amounts of PCBs in use can be renderedharmless with a single cleaning.1 Since the facility is only offline for twodays, it is possible to implement the project on holidays. 2 We provide
end-to-end support from planning to cleaning processes and support
for application procedures to government agencies.
NOTE: This is applicable to transformers with a name plate insulating oil volume of 2,000 liters or more and a PCB
concentration between 0.5 mg/kg and 10 mg/kg.
1 Depending on the transformer, flushing may be performed.
2 The shutdown period may be longer if the oil volume exceeds 10,000 liters, or depending on the conditions at the facility.

Comprehensive power system operation service

Protecting the quality of invisible
electricity to the maximum extent possible.

Comprehensive power system
operation service page

We respond to a wide range of customer issues related to powersystems. The services we provide – from grid analysis to technicalconsulting and engineer training – enable the mitigation of the scope of
accidents and the achievement of smooth grid interconnection. TDS’experienced power system operation professionals provide comprehensive
support to ensure stable, high-quality power system operation andenhanced supply reliability.

9Comprehensive cableand conduit facility service

Comprehensive maintenance that keeps
out-of-sight equipment safe and secure.
Among electric power facilities, power cables, conduits, and underground tunnels (utility tunnels) are not easily visible tothe public, so their status is not always evident. TDS supports the safe and reliable operation of cable and conduit facilities
by performing systematic repair and renewal work on such facilities and providing high-quality maintenance to prevent
serious accidents.

Why choose TDS?
Compatible with any typeor manufacturer
We support all types and manufacturers ofcables. We will make the most suitableselections for your facility configuration tofacilitate a trouble-free facility renewal.

Design engineering tomeet customer needs

Peace of mind in
the event of trouble

Our engineers, who have experience with avariety of construction designs for electric powercompanies, will apply their accumulated
expertise to propose designs and cost-reducing
measures that fulfill your requirements.

In the unlikely event of an accident, TDS
supports customers toward the quickest possible
recovery. From fault point identification to
restoration work and investigation of the cause of
the accident to prevent recurrence, TDS is there.

One-stop service
Our services range from inspections and repairs to new expansion andrenewal work, as well as emergency response. We also handle repair work for
power collection and transforming equipment and other peripheral facilities.

Applicable facilities and equipment●High-voltage to extra-high-voltage cables (oil-filled (OF)cables, CV (continuous vulcanization) cables)●Conduit facilities, underground tunnels, bridges

Inspection and diagnosis

Main service menu
TDS isa one-stop
providerConstruction

10

Repair and troubleshooting●New installation, replacement, and renewal of cables●Diagnosis of deterioration of high-voltage cables●Comprehensive maintenance of oil-filled (OF) cables●Investigation of causes of cable accidents and failures●Pipe laying and excavation

Comprehensive cableand conduit facility service

New cable installation, replacement, and renewal work
We provide support from the design stage with the technology and know-how cultivatedthrough maintenance for power companies, including route selection that considers
customer needs and trouble-resistant equipment configuration. TDS also offerssoil-specific thermal resistance measurement for selecting the optimum cable size forunderground power transmission design.

Cable replacement

Cable connection

DC withstand voltage testing

Pipe laying and excavation work
We provide one-stop support for pipeline facility construction by reducing risk and effort
through various types of coordination and consultation, as well as application andnotification support. We also utilize our expertise in concrete structures to offer
maintenance services for underground tunnels such as utility tunnels that house cables.

Pipe laying

Concrete structure maintenance(rehabilitation methods)

Concrete structure maintenance(STTG method)11

High-voltage cable degradation diagnosis (DC leak current method,
AC superimposing method)
There are two methods – the DC leakage current method and the AC superimposing method – thatTDS can employ to diagnose deterioration in CV cables, which are commonly used in special
high-voltage and high-voltage distribution lines, including the main lines of high-voltage powercollection and transforming facilities. The methods indicated above enable the diagnosis to be
performed while the equipment is online, thereby reducing the risk of accidents occurring.

DC leak current method

AC superimposing method

Comprehensive oil-filled cable maintenanceOil-filled (OF) cables are largely considered obsolete, and as such, the number ofcompanies that can perform maintenance is decreasing. TDS can provide maintenanceComprehensive oil-filled cablemaintenance page

and troubleshooting services for all OF equipment, including the oil-filled cable itself as
well as ancillary equipment. We can also replace oil-filled cables with CV cables.

OF cable insulation oil sampling

12

OF cable oil refill

OF cable oil leak repair

Comprehensive cableand conduit facility service

Troubleshooting of cable accidents and failures
Fault isolation pageIn the unlikely event of an accident or failure of a cable facility, TDS supports swift recovery
by locating the point of failure (identifying the ground fault point), investigating andanalyzing the cause of the failure to prevent a recurrence, and even performing
replacement work. Our engineers with advanced knowledge of electric power companies
and our special survey vehicles that can handle special high-voltage cables enable us torespond quickly and precisely.

Fault isolation

Withstand voltage testing

Cable withstand voltage test vehicle

Chemical analysis-based investigation of causes of accidents and failures
The insulator material of power cables is a chemical product. To determine the root causeof accidents, analysis from both chemical and electrical perspectives is essential. At TDS,

Investigation of causes of cable accidents
and failures pageengineers with experience in the maintenance of electrical equipment are involved inchemical analysis to determine the cause of the accident from both points of view. We canalso propose preventive maintenance measures afterward.

Investigation of causes of accidents
and failures

Damaged cable

Water tree

13

Infrastructure
facilities – steel
and concrete structures

Infrastructure facilities
Steel structure maintenance16

Concrete structure maintenance18

Wire rope maintenance

19

Infrastructure facilities page

14

14

Preventive maintenance solutions
that ensure both safety and longevity.
The safety of social infrastructure facilities that support our daily lives, such as bridges,
highways, dams, and steel towers, is of utmost importance. It is just as crucial to ensurethat they are properly maintained and can be used for an extended period. TDS delivers
diagnosis and maintenance solutions that ensure both the safety and longevity of steel
and concrete structures. It leverages the advanced maintenance technologies it has
cultivated through its experience with electric power facilities to support thesestructures, which are the foundation of infrastructure.

Ensuring safety and reliability

By practicing preventive maintenance, in which the condition of the equipment is continuously
and correctly monitored and maintenance is performed according to the condition, it is possible
to not only maintain the equipment for a long time, but also ensure it remains safe and reliable.

Reducing lifecycle costs

Preventive maintenance can help level out renewal costs and reduce lifecycle costs. TDS
proposes a sustainable, systematic maintenance cycle from a long-term perspective.

Proactively introducing new technologies

TDS actively adopts new technologies, such as the introduction of inspection robots andpatented construction methods. And we are doing our best to solve customers' problems, suchas visualizing difficult-to-access areas and reducing costs.

TDS comprehensive maintenance service

Diagnosis

Reducelifecycle
costs

Construction

Consulting

Comprehensive one-stop, safe, and reliable support, including precise equipment condition
monitoring, maintenance cycle optimization, and high value-added maintenance.

15

Steel structure
maintenance

Sustainable maintenance in responseto the urgency of structural aging.
Steel structures require a great deal of time and money for renewal, and sustainable and planned maintenance is essential for
their safe and extended use. TDS employs proprietary methods and technologies to lengthening equipment service life
through optimal diagnosis and maintenance based on the state of deterioration.

Why choose TDS?
Integrating proprietary
technologies

Leveraging extensive
know-how

Applying collective
technological power

We respond precisely to the needs of ourcustomers with high value-added maintenanceservices that integrate new construction methods
and robot technologies developed in-house.

Based on our expertise cultivated through themaintenance of large-scale facilities for electric
power companies, we provide optimal solutions
to protect the life and safety of steel structures.

We have a large number of employees withJapanese certified qualifications, including SteelInfrastructure Diagnosis Engineer and First-Class
Civil Engineering Works Execution Managing
Engineer. Our professionals have a wealth ofexperience and knowledge, enabling them torespond effectively in a host of situations.

Benefits of preventive maintenanceBy correctly assessing the condition of equipment and repairing it at the optimal time, TDS can not only
extend equipment service life but also reduce lifecycle costs.

Costs

RenewalMaintenanceavailable

Large-scalerenovation

Maintenanceshould be performedat the proper time.

Applicable facilities and equipment●Power transmission towers●Communication towers●Power collection station steel structures●Bridges●Hydraulic steel pipes●Water pipe bridges and piping●Tanks●Steel chimneys●Steel poles●Anchor bolts●Steel structures in general

Main service menu
Aging

16

●Steel structure diagnosis and consulting●Various repairs and replacement of steel pipes●Rust prevention (painting, replacement ofdeteriorated steel, antirust thermal spray method)

Steel structure maintenanceDiagnosis – inspection, survey, and measurement
Engineers with extensive field experience investigate and diagnose the condition ofsteel structure equipment from multiple perspectives. A variety of measurement
methods, such as the use of robots for areas that are difficult to enter, allow us
to see problems in all areas of the facility and correctly determine the condition.

Internal robot inspection

Ultrasonic thickness measurement

Robot diagnosis technology page

Zinc corrosion rate map for evaluating
remaining life

Developed by the TEPCO Research InstituteConsulting
Based on the know-how accumulated over the past 40 years since the foundingof the company, TDS’ experienced, knowledgeable engineers comprehensively
evaluate the various data obtained from the diagnosis. We propose a plan thatmaximizes the life of the equipment while minimizing lifecycle costs.
Optimal diagnosis
Steel condition

Diagnosis of equipment condition

Newly
established

Precise maintenance

Systematic implementation of life extension measures

Realization oflong service life

Develop into
unexpected risks

Lifecycle cost
minimization- Increased rebuilding costs- Collapse and risk of collapse- Loss of public trust

Aging

Construction - various types of repair, rust prevention
Based on the results of the consultation, TDS develops and implements the
optimal renovation and life extension plan, from design to construction. We offer
high-quality construction services backed by our extensive experience, including
the antirust thermal spray method. This method restores the rust-preventive
power of new construction, as well as paint and coating technologies that have
proven their long-term durability on TEPCO Power Grid’s steel towers.

Antirust thermal spray method

Painting

Antirust thermal spray method page

Replacement of deteriorated steel

17

Concrete structure
maintenanceControlling deterioration through surveys and diagnosis
with cutting-edge technology and proprietary repair techniques.
Although concrete is generally regarded as strong and durable, the aging of facilities, especially those constructed during theperiod of rapid economic growth, is progressing. Extending the life of existing facilities while maintaining safety has become
an urgent issue. TDS proposes effective measures for extending the service life of buildings with its unique technologies,
including robot-based surveys and diagnoses and patented construction methods.

Why choose TDS?
Various inspection
and diagnosis technologies

Propose theoptimum repair method

By using robots to inspect and diagnose areasthat are difficult to enter, as well as employing
technology to diagnose fractures, we can help toaccurately assess facility deterioration andreflect that in countermeasures.

We gauge the deterioration of facilities due tocarbonation and salt damage, and use a variety
of technologies to resolve the issue with themost appropriate repair method.

Robot inspection and survey
A robot equipped with a CCD camera can
automatically and safely inspect the walls oflarge structures and other difficult-to-accessareas with high precision.

Water leakage prevention
technology (STTG method)Comprehensive concrete
repair (rehabilitation methods)
We assess the deterioration of concrete structuresand perform repair and reinforcement from a holistic
perspective, including rust prevention for reinforcing
bars and restoration of concrete strength.

STTG method page

Rehabilitation methods page

●Dam retaining walls ●Chimneys ●Surge tanks ●Tunnels ●Underground pits
●Underground tunnels and other concrete structures in general18

We have a large number of employees with national
qualifications, including Concrete Diagnosis Engineer,First-Class Civil Engineering Works Execution Managing
Engineer, and registered surveyors. We respond withreliable technology backed by experience.

This patented method reliably stops a large
amount of water leakage and helps ensure watersealing for an extended period. It also
contributes to reduced lifecycle costs.

Robot diagnosis technology page

Applicable facilities and equipment

Highly skilled technicians

Main service menu

●Diagnosis and consulting for concrete structures ●Various repair services ●Water leakage countermeasures●Salt damage countermeasures, salt content measurement, and concrete strength testingWire rope
maintenance

Safe, environmentally friendly, fully automated robot maintenance.
Wire rope plays a major role in facility safety. Depending on the usage conditions and environment, the durability and lifespanof the product can vary greatly. TDS provides high-quality maintenance at low cost with its fully automated robot thatcompletely removes old grease, diagnoses the degree of deterioration, and performs lubrication.

Why choose TDS?
Short construction period
and low cost

All abnormalities detected

No discharge of wastewater

The work is accomplished remotely andautomatically using robots, ensuring safety andsecurity. And, since there is no need for gondolasor large scaffolding, the construction period can begreatly shortened, contributing to cost savings.

Since old grease is completely removed, wireabnormalities can be precisely diagnosed. New
grease is applied under pressure to the core of
the wire, preventing wire breakage andextending the life of the wire.

All wastewater after cleaning is collected, filteredthrough an oily water separator, and reused aswater for cleaning. This environmentally friendly
operation precludes the pollution of rivers andthe surrounding area.

Automatic high-pressure wire rope cleaning, inspection, and lubrication
Chain

Airflow

Air compressor

Robot diagnosis technology page

Applicable facilities and equipment●Dam gate wire ●Estuary weir gate wire●Long-span suspension bridge

This is a service that extends the life of thehanger ropes of long-span suspension bridges
by mitigating the progress of internal rustsemi-permanently through the use of a uniquerust preventative indentation method.

Gate wire rope

Main body ofcleaning device

Since the old grease is completely removed, thecorrosion, damage, deformation, wear, andtapering of the main unit can becomprehensively diagnosed, enabling a highly
accurate health evaluation.

Repair of hanger rope anchorage

Irrigation hot water flow
Cleaning waste
liquid flow

Oily water
separator

High-pressure
hot water
cleaning machine

Diaphragm pumpLong-span suspension bridge rope repair page

Main service menu

●Cleaning, inspection, diagnosis, lubrication, and repair of wire ropes●Inspection, diagnosis, antirust treatment, and hanger rope anchorage repair

19Renewable energy
facilities

Renewable energy facilities
Renewable energy power plant construction

22

Renewable energy power plant maintenance23

Renewable energy page20

20

Keeping renewable energy projects secureand sustainable through measuresthat anticipate risk.
Renewable energy power plants are subjected to a series of extreme operations in shortcycles, with current flowing close to design limits during the daytime while remaining
unused at night. It is important to fully account for these factors in the quality of thedesign and construction work. Moreover, even after the plant is in operation, risks suchas natural disasters and equipment malfunctions, as well as reduced power generation
efficiency, exist. This makes proper facility maintenance essential. TDS provides
one-stop support for stable, sustainable renewable energy power generation projects,
including construction and maintenance of power plant facilities, grid connection, andoperation and maintenance.

Emphasizing electricity quality

To achieve both stable operation of renewable energy power plants and stabilization of thepower system, TDS engineers with extensive experience in grid connection on the powercompany side will provide the optimal facility design. We also provide smooth support for gridconnection.

Achieving true performance

We strongly support stable operation with our vast experience and knowledge, including
regular maintenance and 24-hour monitoring systems to ensure that the facilities perform attheir full potential.

TDS provides full support
from consulting to construction.

What measures andanalysis are necessary
for grid connection?

Creating documents tosubmit to power companies
and the government isdifficult and troublesome...

We’re not sure if
we’re in compliancewith the law...

We want to start
selling electricity
as soon as possible.

TDS leverages the experience and know-how it has accumulated through its involvement innumerous power facilities, and delivers smooth solutions to customers’ problems.

21

Renewable energy
power plant construction

Design that contributes to maintaining the security andsustainability of renewable energy projects.
Solar power generation must be designed to generate electricity efficiently, minimize transmission losses, and take into
account maintenance after operation has begun. Furthermore, knowledge of and familiarity with the relevant laws andregulations are also essential for grid connection and licensing procedures. TDS provides comprehensive support fromconsulting to installation, solving customers’ problems with technical power and comprehensive capabilities cultivatedthrough the maintenance of electric power facilities.

Why choose TDS?
Design for high power
generation efficiency

Support for complicatedapplication procedures

We propose the construction of facilities with highinvestment effectiveness. Examples include thedesign of facilities with high power generation
efficiency in consideration of the site environment
and the introduction of monitoring systems using
intelligent electronic devices (IEDs).

TDS assists customers with various licensing
and approval procedures, from identifying theapplicable laws and regulations to preparing
application documents and being present during
the application process. We can also provide
support in the case of specialized procedures.

Construction of solar power plants

Construction of privately owned transmission
lines and interconnected substations

We select the most suitable equipment from various
manufacturers according to the purpose of use andthe customer's requirements. We then perform thefoundation work, installation of the equipment, andwiring work in an integrated manner.

TDS offers construction services for interconnected
substations associated with special high-voltage
interconnection and the privately owned transmission
lines connecting them. For the construction of privately
owned lines, we also propose cost-effective routes.

Applicable facilities and equipment●Mega solar power plants ●Interconnected substations for various types of renewable energy power plants●Privately owned transmission lines to various types of renewable energy power plants

22One-stop service
We have established a one-stop system that canhandle everything from consulting toconstruction and safety management reviews.
We also handle all the complicated managementtasks for our customers.

Wide range of consulting services
We provide assistance from the planning anddrafting stages to meet the needs of ourcustomers. We also support specification design
and grid connection consultation to ensure they
proceed smoothly.

Main service menu●Consulting services ●Construction of power plants●Privately owned transmission lines, interconnected substations

Renewable energy
power plant maintenanceRapidly performing precise and comprehensive diagnoses
to maintain high performance.
In addition to the effects of the natural environment, various risks such as problems with electrical equipment can reduce theefficiency of solar power generation, so regular and accurate maintenance is essential. TDS leverages its technical prowess inproviding support for power plants from periodic inspection to restoration to maintain high performance.

Why choose TDS?
24-hour monitoringand quick response

Maintain high performanceWith many years of experience in the maintenanceof electric power equipment, we have a thoroughunderstanding of the appropriate inspection items
for each piece of equipment. Through regular
maintenance, we are able to detect and respondswiftly to indications of abnormalities.

The 24-hour remote monitoring system at themonitoring center allows for speedy response tounexpected power generation stoppages orproblems, and swift recovery.

Solar power plant operation and maintenance●Mega solar power plants

Customers in remote locations can rest assured
that, in the event of an emergency, a TDS
specialist technician from a nearby office will
immediately come to the site to check for
abnormalities and perform restoration operations.

Solar power plant security management

From remote operation management tomaintenance and troubleshooting using external
diagnostic technology, TDS serves customers’
needs. We can also handle the inspection of
special high-voltage electrical equipment.

Applicable facilities and equipment

Reliable emergency service

We offer outsourced security management
services for solar power plants. Assuming therole of chief electrician for the customer's
facilities, we take all possible measures toensure electrical safety.

Main service menu

●Operation and maintenance management of solar power plants●Security management of solar power plants

23

Products

General Electric (GE)-made IEDs

Multifunctional, flexible, integrated
protection and control devices.

An intelligent electronic device (IED) is a device that integrates protection, control, recording, and measurement
functions. It can be set to function according to the user's application. GE's IEDs are suitable for a wide variety ofsystem and environmental conditions around the world, and boast high reliability.
TDS Benefit

TDS Benefit

GE-made IED page

TDS Benefit

10-year warranty
for peace of mind

Authorized distributorof GE productsAward-winning relay replacement
method reduces cost, time losses

The IEDs are covered by GE's 10 Year
Worldwide Warranty system, providing
a 10-year warranty for peace of mind
in the event of a breakdown.

We are the only authorized GE
distributor in Japan that provides
after-sales support.

This method, which earned the 63rd Shibusawa Award, shortens theconstruction period and reduces costs by using existing panels andcables and replacing only the aging relays.1
1 The Shibusawa Award recognizes outstanding achievements in the field of electrical safety.

Main features
All in one
An all-in-one unit that integrates all
protection, control, recording,communication, measurement, andprogrammable functions.

Wide range of products

24

Achieve rapid recovery
The adoption of modularization facilitatesa swift recovery even in the event of
failure.

Connectivity withdifferent manufacturers
Our components support a variety ofcommunication protocols and can be connected
to products of different manufacturers. We canalso replace only selected relays based on needs.

Full range of protection functions

With the addition of IEDs produced by
Alstom (company name prior toacquisition by GE), the lineup is evenmore diverse. We can respond to a wide
range of needs.

Many relay elements are built into a single unit,
making it suitable for almost any application.
Customization allows our customers to achieve
optimum protection.

Remote control capability

Quick analysis of accident causes

A built-in communication function enables
remote control. And it is possible toincorporate an interlock function.

Our components are equipped with a recording
function. The data is automatically saved in theevent of an accident, facilitating rapid analysis of
the cause.

Products

FITCAP

A new concept bolt cap that prevents rusting and detachment.

FITCAP is a bolt cap that both prevents bolts from rusting and nuts from falling off. It reduces the time and cost of
maintenance while maintaining equipment safety. It can be used repeatedly without adhesives. It is also ideal forequipment that needs to be inspected and retightened.

FITCAP page

Main features
Outstanding
antirust performance

Repeated use possible
Hand-tightening is sufficient—no sealantor other tools are required. Immediate
release is possible at fastening points thatneed to be opened and closed
periodically for inspection and repair.

The special material containing antirust
ingredients adheres perfectly to theobject. It shuts out moisture andultraviolet rays, and exhibits excellent
antirust performance.

Keeps nuts securely attached

Excellent cost performance

It meets NAS3350 vibration testing
requirements, and can withstand the most
severe vibration or shock. It can also be
used to keep nuts firmly fixed.

Even large sizes are available without
molding at low cost. We can manufacture
just the right size to meet the requirements of
the installation site in millimeter increments.

SECleanA cleaning tool with excellent dust-collecting properties.

SEClean is a polishing tool with high dust-collecting properties that controls the scattering of shavings and wirematerials while firmly removing rust and paint from steel structures, even in the corners, with a grinding force
equivalent to that of SP2 polishing. The lightweight, compact design reduces the burden on the operator.

SEClean page

Main features
High dust collection efficiency

Dust collection in corners

The use of a proprietary dust collection
cover drastically reduces the scattering ofshavings. It supports efficient work while
being environmentally friendly.

The slide cover at the end of the dust
collection cover opens and closes,
allowing the brush to reach even thecorners for highly accurate cleaning.

Lightweight and easy to use

Significantly improved
safety performance

Combining a compact dust collection
cover with a low-speed, high-torque disc
grinder, the machine has the same
workability as conventional models andthe advantage of being lightweight.

The use of materials and structures thatprevent breakage of the brush wire, as wellas dust collection covers, suppresses thescattering of wire, making operation safer.

A proven paint that has protected powertransmission towers for many years.

TPG PaintThis paint provides long-term protection against corrosion by employing a two-coat coating system. The base coat
is a modified epoxy resin paint with superior antirust properties, while the top coat is a fluoropolymer resin paintfeaturing high weather resistance.

TPG Paint page

Main features
Superior weather resistance

Aesthetic appeal preserved

The top coat incorporates fluoropolymers
and pigments that inhibit photocatalytic
reaction. The paint has excellent weather
resistance and retains its luster even inharsh environments.

The two-coat system prevents thepenetration of corrosive factors andprovides incredible antirust performance
to preserve the beauty of the product.

Long-term
corrosion resistancePrevents paintfilm wear and tear

Applying a primer coat with modified
epoxy resin paint provides excellent
adhesion and long-term rust prevention.

Compared to conventional paints, the topcoat film features minimal wear, retains its
thickness over a long period of time, andprotects the base coat.

25

Training and seminars

Cultivating specialists responsible for the future ofcompanies and electric power.
As the aging of electric power and other social infrastructure facilities progresses, optimal
maintenance and renewal to maintain facility functions are becoming increasingly important.
As such, the cultivation of human resources to support maintenance and renewal has
become an urgent issue. TDS provides training and seminars that enable trainees to learn
electric power engineering effectively and systematically, taking advantage of theexperience and technology we have accumulated over many years supporting electric
power network facilities. At our state-of-the-art training facilities, our experienced
instructors nurture the electric power specialists of the future.

Power transformer training facility

Two locations easily accessible from central Tokyo

Underground power transmission
training facilities

The Human Resources and Technology Development Center is equipped with new and old
substation and underground power transmission equipment, allowing for realistic andpractical training that goes beyond theory to actually using and operating the equipment. The
center is characterized by its ability to provide effective and systematic training in electric
power engineering. There is a center in Saitama equipped with substation training facilities
and a near miss experience room, and a center in Tokyo with underground powertransmission training facilities.

Near miss experience facilities

Human Resources and Technology Development Center
Saitama City, Saitama Prefecture (just north of Tokyo)

26

Human Resources and Technology Development Center
Tamagawa, Ota Ward, Tokyo*At the TDS Tamagawa Plant

Training and seminars

Electrical equipment engineer
training school

A training program that can be applied topractical work, using actual equipment.

Using actual power collection and transforming equipment, students can learn the principles, structures, androles of equipment and protective relays, as well as examples of disasters caused by electrical equipment.
With guidance from experienced professionals, students will be able to understand electrical equipment,
which will not only ensure equipment safety but also further improve the skills of the technicians.

Training using actual equipment is possible

A full lineup of training equipment

Near miss experience school

Electrical equipment engineer
training school page

Experienced instructors

Improving safety awarenessby simulating hazards.

With the ultimate goal of eliminating workplace accidents, this practice-oriented program provides realistic
and safe simulated experiences of existing potential hazards. Students can learn the skills necessary toensure safety on the job site in a condensed, half-day course. It will heighten sensitivity to hazards andimprove safety awareness.

Omiya

6

min

15
min

Akabane25min

Ikebukuro

To near miss simulation
school page

Three-minute walk from

JR Minami-Yono Station
Human Resources
and Technology
Development Center

30
min

Shinjuku

45
min
Tokyo

Tracking experience

Potential day trip to a facility near the Tokyo
metropolitan area

Practice-oriented program

Power engineering training

Experience newly introduced full-harness
crash prevention equipment

Students can focus only on acquiring necessary
knowledge, making the program highly efficient.

Professional instructors with extensive experience at electric power companies provide a practical, usefulcurriculum from basics to application, customized to meet the needs of each customer. A variety of theme-based
seminars are also available.

Power engineering training page

Tailor-made training

Training programs are customized for a variety of themes and issues,
including facility design, grid operation, and maintenance management.

SafetyThorough safety training based on
extensive experience

TheoryOperation

Theoretical system that canbe used in practice frombasics to application

A full sensory experience
conveys the realities ofoperation

DesignTeaching design concepts
and techniques developed throughpractical experience27

■ Please feel free to contact us for further information.

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

TEL: +81-3-6371-3140

https://www.tdsnet.co.jp/

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