1923-1946
Founded as "Toko Shokai" immediately after the Great Kanto Earthquake to play a part in restoring electricity.
November 1923
Due to the increased demand for electrical work during the restoration work following the Great Kanto Earthquake, Toko Shokai Limited Partnership was established at 1-1 Yaesu-cho, Kojimachi-ku, Tokyo City, Tokyo Prefecture.
October 1932
Establishment of Toko Shokai Co., Ltd. through organizational restructuring
October 1944
Tokai Electric Construction Co., Ltd. is established as a result of reorganizing companies in the electrical construction equipment network of the Ministry of Munitions, and it continues to operate as its Tokyo branch.
Construction projects at that time
Bunka Apartment House
Former Kojimachi Elementary School
Railway power lines near Kawasaki Daishi Station
1947-1987
Spreading "conscientious electrical work" throughout Japan
March 1947
The Tokyo branch of Tokai Electric Construction Co., Ltd. was separated and established as Toko Electrical Construction Co., Ltd. in Naka-ku, Nagoya-City, Aichi Prefecture.
Branch offices were established at the current locations of the Hokkaido and Kyushu branches.
May 1947
Headquarters relocated to 2-4, Nishikanda, Chiyoda-ku, Tokyo, and began operations.
July 1947
Establishment of Kanagawa Branch
December 1947
Headquarters relocated to 1-8, Nishikanda, Chiyoda-ku, Tokyo (current location).
Establishment of Tohoku Branch.
June 1949
Establishment of Chubu Branch
January 1954
Establishment of Marunouchi Branch
October 1955
Establishment of Kansai Branch
July 1958
Establishment of Toko Kozai Co., Ltd. (now known as TK Techno Service Co., Ltd.)
April 1975
Establishment of Eastern Kanto Branch
June 1977
Establishment of Western Tokyo Branch
April 1985
Establishment of Northern Kanto Branch
Construction projects at that time
Sasayama ultra-shortwave radio relay tower
Nippon Medical School Hospital
Former Shin-Marunouchi Building
Headquarters building of North Pacific Bank
Keio Department Store
Dai Nagoya Building
Kasumigaseki Building
Former Headquarters building of the Industrial Bank of Japan
1988-2011
Overseas expansion and
Establishing Toko's reputation as "Toko specialized in technology"
May 1988
Establishment of Thai Toko Engineering Co., Ltd. (Thailand)
April 1991
Established Management Philosophy and Vision.
June 2004
Establishment of TC Powerline Co., Ltd.
April 2005
Opening of Eastern Tokyo Branch
June 2006
The Company changes its trade name to Toko Electrical Construction Co., Ltd. (Japanese KANJI notation change)
April 2009
Completion of Ichikawa Training Center.
Ranked top in the Electrical Equipment Construction category of the Kanto Regional Development Bureau's "List of Qualified Contractors for Construction Works".
Construction projects at that time
Shinkin Central Bank Atsugi Center
1,000kV Gunma-Yamanashi main line
Headquarters building of Fujisankei Communications Group
2012-2022
Being a pioneer in the renewable energy industry
February 2012
Establishment of SUN ENERGY ISHINOMAKI Co., Ltd. (Renewable Energy Business)
August 2012
Establishment of SUN ENERGY HIRONO Co., Ltd. (Renewable Energy Business)
February 2013
Establishment of Iitate-Madeina Solar Power Generation Co., Ltd. (now known as Iitate-Madeina Renewable Energy Power Generation Co., Ltd.)
August 2014
Completion of new headquarters building (Toko Electrical Construction Building).
September 2014
Establishment of Toko Agri Farm Co., Ltd. (Agricultural Corporation)
February 2015
Dissolution of TC Powerline Co., Ltd.; establishment of the Power Transmission Line Department at headquarters
April 2015
The Company acquires all shares of Seeds Garden Co., Ltd. and establishes Toko Seeds Garden Co., Ltd. (Nursing Care Business).
April 2016
Opening of Lumie Ichikawa, serviced housing for the elderly.
Establishment of Myanmar Branch, Thai Toko Engineering Co., Ltd.
June 2017
Establishment of Vietnam Toko Engineering Co., Ltd. (Vietnam)
January 2018
Establishment of SUN ENERGY KAWAUCHI Co., Ltd. (Renewable Energy Business)
May 2018
Opening of Tsukuba Skills Development Center
November 2019
Establishment of Toko Myanmar Co., Ltd. (Myanmar)
July 2020
Establishment of CHUBU SOKEN Co., Ltd.
Establishment of TA LIFT Co., Ltd.
March 2021
Participation in Japan Climate Leaders' Partnership (JCLP)
November 2021
Opening of Mirai-daira Training Lodging Facility (obtained ZEH-M Ready certification)
October 2022
Completion of Shonan Business Office and company housing (obtained ZEB Ready certification)
Construction projects at that time
Wind Power Kamisu Offshore Wind Farm
Iitate-Madeina Renewable Energy Plant
Hidashinano DC main line
Nishi Kyushu Shinkansen
2023 onwards
Looking ahead to the next 100 years,
we are taking on new challenges in new fields. 
November 2023
100th Anniversary of the Company's founding
April 2024
Information disclosure based on the TCFD recommendations
July 2024
Company-wide launch of Business Process Outsourcing (BPO)
August 2024
The Company concludes a "Partnership Agreement for Achieving Regional Decarbonization" with Hirono Town, Iwate Prefecture.
November 2024
The Company acquires shares in Hokushin Equipment Co., Ltd. (converting it into a wholly-owned subsidiary).
February 2025
The Company receives the highest level of certification, the Eruboshi Certification (three stars).
April 2025
The Company formulates the Long-Term Vision 2035 and Medium-Term Management Plan (FY2025-2027).
June 2025
The Company increases its capital to ¥2,034 million.
Es Con Field Hokkaido
JRE Miyagi Kamimachi Wind Farm