Company history

Kandenko has no founder. In September 1944, under a wartime ordinance for the reorganization of the electrical contracting trade, eight contractors led by Kyoritsu Kogyosha were merged into a single company — and Kanto Distribution, the utility that carried the region’s power and placed the orders, joined as a shareholder of the new firm. Kanto Electric Works was capitalized at ¥3 million, put its head office in Tameike, Akasaka, Tokyo, and opened eight branches on the same day to cover Tokyo and the seven surrounding prefectures. The same ordinance produced a sister company in Kyushu in December 1944; nineteen such mergers were completed nationwide by March 1945.

What made the arrangement unusual was that the buyer of the work also owned part of the seller. It never lapsed. When the 1951 reorganization of the power industry turned Kanto Distribution into Tokyo Electric Power, the prime-contractor relationship transferred intact to the new utility — and as of March 2025, TEPCO Power Grid still held 46.35% of Kandenko’s shares.

The postwar decades were spent giving that inheritance a legal and financial frame. The Construction Business Act of 1949 gave electrical contracting a statutory footing, and the company was registered under it in October that year. In 1959 it opened an Osaka office, its first base outside the TEPCO service area. It listed on the second section of the Tokyo Stock Exchange in October 1961 with capital of ¥350 million, and in 1970 — the year it added civil engineering and air-conditioning and piping work and opened branches in Sendai, Nagano and Sapporo — it was promoted to the first section.

Growth through the 1970s came from adding trades rather than clients. Standalone sales rose from ¥60.5 billion in the year to March 1971 to ¥104.5 billion in 1975 and ¥193.3 billion in 1980. Already by March 1975 indoor wiring — private-sector work — was the largest order category at ¥56.0 billion, or 51%, ahead of distribution-line work for the utility at ¥31.7 billion. The company built a training centre for its own site technicians in 1973, qualified as a specified construction business under the amended act in 1974, began taking nuclear-plant work in 1979, and opened an office in Singapore in 1981, its first abroad.

In September 1984 it dropped the words “electrical works” from its name and became Kandenko Co., Ltd. — formalizing the abbreviation everyone already used. The rename changed no contract, but it restated what the company said it was: “electrical works” was the utility’s own word for the job, and taking it off the door amounted to a declaration that customers would be sought outside the client. In the year to March 1985 standalone sales were ¥276.6 billion with net profit of ¥5.3 billion; that May the company raised $41.9M (¥10bn) in unsecured convertible bonds, nearly six times its capital, and in 1987 it set up a facilities-management subsidiary to earn recurring fees on buildings it had already wired.

The declaration took far longer to reach the order book. Branches were added in Nagoya (1990) and Kyushu (1991) and a research laboratory in 1993, yet by 1998 Kandenko was still described in the trade press as the most utility-dependent of the contractors owned by Japan’s power companies — Kansai Electric’s Kinden and Chugoku Electric’s Chudenko had diluted their dependence far earlier — with the heaviest personnel cost per employee in the group and slack that deregulation of the power business was about to expose. President Hoshino Satoshi said of the general contractors’ squeezed terms that work “so bad it does not pay, we have no choice but to decline.” Between 1997 and 1998 the company moved its distribution-maintenance workforce into eight prefectural subsidiaries, and set up a dedicated unit for building-renovation work to convert maintenance access into new orders.

The next attempt at breadth was made with capital rather than with trades. Kandenko started an information-network subsidiary in 2000, took a real-estate brokerage licence in 2001, and in 2003 bought into Hankyu Electric Works in the Kansai region. None of it lifted the top line: consolidated sales slid from ¥500.0 billion in the year to March 2002 to ¥435.1 billion the next year and ¥426.0 billion in 2004, and stood at ¥430.9 billion with net profit of ¥6.2 billion in 2005.

The purchases that mattered pushed deeper into infrastructure rather than away from it — a transmission-tower and power-line specialist in 2004, and in 2008 Kawasaki Setsubi Kogyo, a Nagoya-listed equipment contractor that extended the group into central Japan. Earnings stayed thin and volatile through the period: operating profit of ¥10.7 billion in the year to March 2006 fell to ¥4.4 billion in 2007, recovering only to ¥6.5 billion on sales of ¥468.6 billion in 2008.

Then the client itself was shaken. The March 2011 earthquake and the Fukushima Daiichi accident disrupted TEPCO’s capital spending, and Kandenko’s consolidated net profit collapsed to ¥1.9 billion in the year to March 2012 on sales of ¥441.8 billion. The same disaster opened three new fields of work at once — decommissioning and decontamination, the repair and hardening of the distribution grid, and the construction of renewable generating plant. The third of these would change what kind of company Kandenko was.

Contracting income ends when the job does. However many projects it won, Kandenko earned each fee once, handed the asset to the customer and walked away. When Japan’s feed-in tariff took effect in July 2012 and made renewable generation bankable, the company took the other side of that trade: in October it acquired 90% of the voting rights in Choshi Wind Power Development, which already ran two working wind farms in Chiba prefecture — 13,500 kW commissioned in 2004 and 9,000 kW in 2006. A solar company followed in 2013 and a biomass plant company in 2015, giving it wind, solar and biomass, and a new division to run them.

Owning generating plant also meant owning its risks. Construction profit is settled at completion; a power plant is re-valued whenever the outlook changes, and the group booked impairments of ¥3.3 billion in the year to March 2024 and ¥2.0 billion in 2025. Kandenko kept the assets anyway — nineteen sites totalling 66.6 MW as of March 2024 — raised $183.8M (¥20bn) in convertible bonds in 2016, its first such issue in thirty-one years, and in July 2024 consolidated renewables and new-business development into a single Green Innovation division.

The contracting base underneath all this never went away, and it is still what pays. Of ¥583.1 billion in standalone completed work in the year to March 2025, ¥141.7 billion came from the TEPCO group, including ¥111.4 billion of the ¥126.7 billion in distribution-line work. That year was the best in the company’s history — consolidated sales of ¥671.8 billion, operating profit of ¥58.3 billion and net profit of ¥42.3 billion, up 55% — and it was from that position of strength that the Milestone2030 plan, published in 2025, set targets of ¥800 billion in sales and ¥60 billion in operating profit for fiscal 2030, a 50% cut in greenhouse-gas emissions against 2020, and the goal of standing as a “green innovation company” at the firm’s centenary in 2044.