What Koden Japan does

Koden Japan (株式会社恒電社, KODEN) is a privately held Japanese engineering, procurement, and construction (EPC) firm headquartered in Ina Town, Kita-Adachi District, Saitama Prefecture, with a branch office in Omiya, Saitama City. Founded in 1992 and incorporated in December 1993 by current Representative Director Takaaki Tsuneishi (born 1963, Kochi Prefecture), the company targets corporate (B2B) clients in the Kanto region — primarily factories, offices, and commercial facilities — with two integrated service lines: self-consumption solar photovoltaic systems and high-voltage electrical equipment engineering. The solar business covers system design, equipment procurement, construction management, electrical works, and ongoing maintenance as a single-vendor offering, and is delivered alongside the electrical engineering line (cubicle renewal, PAS/UAS installation, cable renewal, high/low-voltage switching, LED retrofits, and PCB disposal support), which together address client needs for energy cost reduction, decarbonization, and aging electrical infrastructure.

Koden's underlying technology is conventional but tightly integrated EPC project management for rooftop, solar carport, and self-consignment (自己託送) solar installations, applied to a generation portfolio exceeding 40MW developed through group companies — including a 9.8MW mega-solar in Bibai City, Hokkaido. The company holds Science Based Targets (SBT) certification and is a member of the Panasonic Expert Contractor network. Its revenue model combines project-based EPC fees (one-time), recurring O&M maintenance contracts (subscription), and ongoing power generation income from FIT and self-consumption arrangements across the group. All sales are direct enterprise field sales in the Kanto region, supported by dedicated service websites, content marketing, YouTube and SNS channels, and trade show participation (e.g., Factory Innovation Week 2025 at Makuhari Messe).

The company operates under a multi-entity group structure (Koden Holdings and at least eight operating subsidiaries spanning engineering, power supply, generation, and energy services), all wholly owned and founder-controlled, with no external institutional investors. Registered capital is ¥30 million, and there have been no disclosed funding rounds, M&A activity, or leadership transitions beyond internal promotions. Headcount is not publicly disclosed. Named customers span food manufacturing (Iwasaki Food Industry), meat processing and distribution (Kenpoku Meat Center Cooperative, Nakamura Ranch), printing (Eco Advertising Printing), and diplomatic facilities (Australian Embassy) — illustrating a niche but diverse Japanese industrial client base with no single dominant customer publicly disclosed.

Name

Koden Japan

Legal name

株式会社恒電社（コウデンシャ）

Website

https://koden-kk.co.jp

Company type

Private

Founded year

1992

Operating status

Operating

Short description

Koden Japan (株式会社恒電社) is a privately held Saitama-based EPC firm providing B2B self-consumption solar photovoltaic systems and high-voltage electrical engineering services to factories, offices, and commercial facilities across the Kanto region, with group-owned solar generation capacity exceeding 40MW.

Ownership category

akta.pro rank

Product category

Electrical Construction Services

NAICS

Electrical Contractors and Other Wiring Installation Contractors (23821), Electric Power Generation (22111), Power and Communication Line and Related Structures Construction (237130)

SIC

Electrical Work (1731), Cogeneration Services & Small Power Producers (4991), Electric Lighting & Wiring Equipment (3640)

akta.pro primary industry

Construction Management & General Contracting (EPCM, Scheduling, QA/QC, HSE) (EUAMAFAJ)

akta.pro secondary industries

Power Plant Electrical Systems EPC (Switchyard, Transformers, Protection & Controls) (EUAEAAAM), Electrical Balance-of-Plant EPC (MV Collection, Cabling, Earthing, Lighting) (EUAEADAB)

Keywords

• Electrical construction services
• Solar PV installation
• High-voltage engineering
• Industrial electrical contracting
• Commercial solar systems

Headquarters

HQ city

Saitama

HQ country

Japan

HQ region

Asia

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. 太陽光発電設備事業: Design, procurement, installation, and maintenance of self-consumption solar photovoltaic systems for corporate clients. Revenue is generated through project-based fees covering system design, equipment procurement, installation construction, and ongoing maintenance contracts. The company also developed and operates its own solar power generation facilities (over 40MW group-wide), generating power generation income.
2. 高圧電気設備工事業: High-voltage electrical engineering services including cubicle new installation/renewal/repair, PAS/UAS installation, cable renewal, high/low voltage switching, LED lighting equipment installation. Revenue is project-based, driven by construction contracts.
3. 再生可能エネルギー発電事業: Renewable energy power generation business. Group companies develop, own, and operate solar power plants. Group-wide capacity exceeds 40MW, generating electricity sales revenue through FIT (Feed-in Tariff) and self-consumption arrangements.
4. O&M（運転保守）サービス: Operations and maintenance services for installed solar and electrical equipment, providing ongoing revenue through maintenance contracts.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels8 records

Core offering

Koden Japan is an electrical construction contractor that provides high-voltage electrical engineering works, self-consumption solar PV system installation, LED solutions, and PCB disposal services to corporate and facility clients. The company delivers end-to-end electrical infrastructure services — from design and installation to maintenance — primarily for businesses seeking on-site power generation and electrical system upgrades.

Product overview

株式会社恒電社（Koden Japan）は、法人向け自家消費型太陽光・高圧電気工事を提供する埼玉県の企業。主力事業として自家消費型太陽光発電システムの設計・施工・保守メンテナンス一気通貫サービスと、高圧電気設備工事業（キュービクル更新、PAS/UAS設置、ケーブル更新、LED照明工事等）を展開。「再生可能エネルギーの設置方法×調達方法」として、オンサイト型自己所有、オンサイトPPA、オフサイト自己託送、フィジカルPPAなど7つの調達方法に加え、ソーラーカーポートや自己託送モデルなどの設置方法を組み合わせた提案を行う。PCB処理対応やLED化による省エネ提案など、クリーンエネルギーと電気設備の両面から企業の脱炭素・コスト削減を支援する。B2B型のモノ卖出サービスであり、ソフトウェア/API製品やAI技術の提供はない。

Differentiator

Problem solved

Functional benefit

Products and services

• Electrical Construction Services
• Construction Works
• High-Voltage Electrical Engineering
• Self-Consumption Solar PV Systems
• LED Solutions
• PCB Disposal Services
• Power Systems Services

Quantifiable outcome

• 自家消費型太陽光導入後、冷蔵・冷凍設備使用時の中電力をほぼ自家消費で賄い、大幅な電気料金削減とCO₂排出抑制を実現（県北食肉センター事例：143.175kW設備、345枚パネル、680㎡）
• +1 more outcomes

Named customers5 records

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Eleven partnerships are on record, tiered minor, core and moderate.

• 大宮アルディージャminorOthersJリーグクラブ大宮アルディージャのオフィシルパートナー企業。パートナー企業としてクラブの活動を支援している。採用サイトやサービスサイトにもパートナーロゴが表示されている。
• コデンホールディングス株式会社coreOthers関連会社（グループ会社）。持株会社としてグループ全体の経営管理を行う。
• 株式会社コデンパワーエンジニアリングcoreOthers関連会社。グループ内のエンジニアリング機能を担う。
• 株式会社コデンパワーサプライcoreOthers関連会社。グループ内の電力・機材供給機能を担う。
• 美濃国電源開発株式会社coreOthers関連会社。電源開発・発電事業を手掛けるグループ会社。北海道美唄市で9.8MWのメガソーラー開発などに参画。
• ケセンエナジー株式会社minorOthers関連会社。エネルギー関連事業を手掛けるグループ会社。
• 株式会社Logie / 株式会社ソラ / 株式会社コアフィールズ / 株式会社はやぶさ未来エナジーminorOthers関連会社群。各社'énergie関連事業やサービスを手掛けるグループ会社。
• 合同会社HARAFUJIminorGTM or Marketing Partnerマーケティング支援パートナー企業。恒電社のBtoBマーケティング戦略の構築、コンテンツ制作、Webサイト改修、MA/SFA導入支援などを支援。2021年12月から協業を開始。
• 新明電材株式会社minorOthers電気機材经销商。パートナーインタビューで名前が上がる。「家族」と「社員」、そして「社員のご家族」を大事にする会社として紹介。
• 株式会社リノパートナーズminorOthersビジネスパートナー。「新しいことにチャレンジするときに、『できない理由』ではなく『どうすればできるか』を考える姿勢が組織全体に浸透している」と評されている。
• Panasonic株式会社（エレクトリックワークス社）moderateTechnology or Integrationかつてのパートナー関係（ дом Panasonicのエキスパート工事店制度）。住宅設備機器・営業ノウハウの取得、ブランド信用力を活用して顧客信頼を構築。代表インタビューで言及され、「今も見当に感謝している」と評価されている。

Scale indicators4 records

Recent moves9 records

Expansion highlights6 records

Direct peers

• Eco Style Co., Ltd. Eco Style is a Japanese company focused on solar power EPC, generation (land-based mega-solar), and self-consumption models for corporate clients; directly comparable to Koden in offering integrated solar EPC plus owned generation across Japan.
• Japan Eco System (日本エコシステム): Japan Eco System is a renewable energy developer and EPC focused on solar power plants in Japan; shares Koden's model of solar project development plus construction and operates in adjacent segments of the corporate self-consumption market.

Broad incumbents

• Kandenko: Kandenko is a leading Japanese electrical construction firm that competes directly in the same enterprise high-voltage, substation, and renewal/upgrade work; national network and deeper balance sheet make it a broad incumbent competitor to Koden's electrical contracting business.
• Sharp Energy Solutions: Sharp Energy Solutions is a Japanese solar PV manufacturer and EPC provider serving residential and commercial segments; comparable to Koden on the self-consumption solar EPC side and on rooftop PV product supply, though much larger scale.
• Eurus Energy Holdings: Eurus Energy is a Japanese renewable energy developer (wind and solar IPP) owned by Toyota Tsusho and Tokyo Electric Power; comparable as a downstream peer in solar power generation and project development, with national and international scale.
• NTT Anode Energy: NTT Anode Energy is a major Japanese renewable energy developer (solar, wind, biomass) that competes in distributed renewable generation; a broad incumbent in Koden's renewable power generation business with significantly larger balance sheet and project pipeline.
• Kyudenko: Kyudenko is a major Japanese electrical and air-conditioning construction company; it competes with Koden on enterprise electrical contracting (cubicle, cable renewal, LED) and renewable energy EPC across multiple prefectures, though with stronger Fukuoka regional roots.
• Tokyu Construction: Tokyu Construction is a diversified Japanese general contractor that competes for renewable energy construction and electrical infrastructure work at a much larger scale; useful comparable for understanding margin and scale benchmarks across enterprise B2B infrastructure services.
• Sanki Engineering: Sanki Engineering is one of Japan's largest mechanical and electrical engineering contractors; it competes for the same enterprise high-voltage electrical equipment installation and energy-related construction work that Koden provides, but at national scale and with a broader portfolio of services.

Emerging players

• Renova Inc. Renova is a Japanese renewable energy developer (solar, biomass, wind, geothermal) listed on the Tokyo Stock Exchange; comparable to Koden's solar generation arm but with a broader energy mix and earlier-stage execution across multiple technologies.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• Xtwitter.com/KodenSoccer
• YouTubeyoutube.com/channel/UCEzd8jsU7v9XviekHqTnSYg
• Facebookfacebook.com/kodenkk
• Instagraminstagram.com/koden_inc

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Subsidiaries9 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments3 records

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Koden Japan