In Kampala, Uganda in September, 2008 as a member of Investment Promotion & Observation Team both by Japanese Government and Private sectors

Office KTK was established in Onomichi-city, Hiroshima in Japan in 1977 as a translator's and interpreter's office for SMEs. Since then we have served for many companies, groups and individuals with its business policies of contribution to internationalization, natural environment and local communities.

KEC Inc., the predecessor of Office KTK, has been an electronic and chemical technology development company and it worked on developing the electricity saving technologies and the devices (named SOD) between 1994 and 2012. It won Energy Conservation Award in 1997 as the smallest company ever, and the technology has been transferred to NTT-AT.

The SOD also has received two other prominent awards, making us a triple awards winner.

This SOD technology has now been applied to Internet SOD as IoT (Internet of Things) as well. （Introductory video at the exhibition）

Notice: The homepage site of KEC Inc. （www.kec-intl.com) and its E mail address were closed on December 31, 2013.

Currently, we are focusing on the development of compact, high-efficiency photovoltaic power generation and energy storage systems.

What is SOD? Watch, listen and check it at the following sites, please.

TV introduction on NHK

in Japanese

Radio introduction in Gifu

in Japanese

Introduction by KTK

in English

Example of overseas introduction (booklet of the German Federal Environment Agency)

Serial Introduction of SOD development on Internet books

Wow! Here comes Setsuden-mushi!

Trajectory of Energy Conservation Grand Prize-winning Technology Development

The expression "Sustainable Development Goals" (SDGs) has been often used these days, but our office, OFFICE KTK, was already working on SDGs in 1994 with the development of energy-saving technology.

SOD was calculated its environmental impact using the life cycle assessment method and also evaluated for its environmental impact reduction effects by itself, which led to Type III EcoLeaf environmental label certification as the 3^rd one in Japan,

Global climate change prevention

Global warming caused by standby power consumption of land line phones

Compact, high-efficiency solar generation and storage system

DIY Local production ＆ consumption of electricity (at home)

Balcony power generation, narrow site installation, automatic solar tracking

Phase 2 of development from 2025

Compact, high-efficiency solar generation and storage system with automatic solar tracking

Conventional rooftop solar generation system

Global environmental protection, carbon dioxide emission reduction, and abnormal weather stop can be achieved at home by your concrete actions using this this system.

Inquiry by e-mail　More information

Know-how will be made available free of charge.

We are looking for collaborators (companies) in research, development, prototyping, manufacturing, and use by DIY!

← Check it out in the video.

「Comparison with conventional systems」 「Featured in the newspaper」

「Workshop for DIY work」「Generation & Consumption Data」　

Automatic Electricity Saving (Power off) Outlet

　Only one technology since 1994 SDGs　　Free testing available

This technology achieves zero standby power, which cannot be overcome by digital technology.

Please use this technology to develop new products and/or services and to improve existing products and/or services.

For more information, please click here.

Remote Power Controller (switch, SOD)

Only one technology since 1994 SDGs　　Free testing available

This SOD technology is now available for free testing as Remote power controller.

Too cold Japanese houses, causes and countermeasures

Double glazed windows with polycarbonate

Interpreting business activities

A lecture by Dr. Svante Pääbo, winner of the 2022 Nobel Prize

Overseas business activities

The following pictures show the overseas and its related activities.

EIKEN 1st Graders' Network in Japan　

Only one network of this kind in Japan, Volunteer activity

　　On April 12

　　TV coverage on

　　EIKEN 1st Graders' Network

　　Free English learning society

Private English lesson on line

"Online English learning support" and Tour Guide for non-Japanese are available at Office KTK as the language related business.

English learning support is to be finished in March, 2025

If you wish to continue with lessons, we will refer you to substitute teachers.

Other business fields and activities

This website also has a blog page, hobby pages, regional volunteer activity pages as well as TV and radio program production recorded pages.　　　　　　　　　　　　　　　　　　　　　　　　　

Notice: The homepage site of KEC Inc. （www.kec-intl.com) and its E mail address were closed on December 31, 2013.

Office & Access Inquiry

Greetings

STEP 1st Graders' Network

Hobbies Volunteer work

Tour guide Karaoke music

STEP 1st Graders Network

Volunteer activity

Free English Learning Society

Volunteer activity

Classic guitar playing

Hobby activity

Introduction of media coverages

Introduction of KTK & Technologies by medias

Introduction by TVs

Coverage by newspapers and magazines (～2012)

Introduction by videos

KTK Homepage

Career history (Karl Kamamoto)

Hobby introduction (Karl Kamamoto)

Volunteer & Hobby (Karl Kamamoto)

Japan's Shimanami Kaido: One of the world's most incredible bike routes by CNN

More pictures are here.

Introduction of music activities

Please listen to those while surfing our home pages.

Music Space 2010, an original guitar music for us,

compsed by A. Kitagawa, a guitarist

La Playa 　　Barcarole 　　Feste Lariane

Recuerdos de la Alhambra 　Amazing Grace

Lagrima　　　II Ferroviere Dream of Love No. 3

Song of Life (with piano accompaniment）

Feste Lariane 2021 Sake yo Solamente Una Ves

played by the site owner, Karl Kamamoto

L' estro Armonico / SORA,

　　　　　a classic guitar group, Karl Kamammoto

News updates

June 20, 2025	Interpreting work for the lecture by Dr. Svante Pääbo, winner of the 2022 Nobel Prize in Physiology or Medicine
March 18, 2025	New name of 「Sunflower Power Station」 for Sun tracking compact, high-efficiency solar power generation and storage system
March 01, 2025	Comparison illustration for Compact, high-efficiency solar power generation and storage system
Feb. 11, 2025	Compact, high-efficiency solar power generation and storage system featured by the newspaper
Jan. 25, 2025	Too cold Japanese housed, causes and countermeasures, TV show on NHK Double-pane windows
Jan. 16, 2025	155 members in Eiken Level 1 (& equivalent) Qualified Persons Network (E1N) in Japan
Jan. 1, 2025	A Happy New Year

Dec. 14, 2024	Eiken Level 1 (& Equivalent) Qualified Persons Network (E1N) in Japan, Map of Registered Members Updated
Sept. 20, 2024	Global warming by standby power consumption of land line phones
Sept. 17, 2024	Corporate and technical tours for foreigners, newly established
Sept. 14, 2024	Only One & Number One Companies in Mfg. in Hiroshima renewed
Sept. 09, 2024	Tour guide (3 days) record for Americans in Hiroshima prefecture
Sept. 02, 2024	Classic Guitar Live Concert of my own plays
August 08, 2024	Compact, high-efficiency solar power generation and storage system in Video
June 01, 2024	Development of more efficient solar generation system
May 07, 2024	New career history of Karl T. Kamamoto
April 20, 2024	Himawari Music Festival finished its activity since 2012.
April 07, 2024	Newspaper coverage of Eiken 1st graders' Network in Japan
Feb. 20, 2024	New homepage for Japanese products overseas
Jan. 27, 2024	Visting Guitar Performance 2024 - 1
Jan. 1, 2024	A Happy New Year