Tohoku Denka Kogyo

What Tohoku Denka Kogyo does

Tohoku Denka Kogyo (東北電化工業株式会社) is a Yamagata-headquartered, privately held electrical construction company founded in 1947 and led by the Aizu family, with current President Keiichiro Aizu (會津圭一郎) and Honorary Chairman Hisajiro Aizu (會津久治郎). The firm designs, installs, and maintains electrical, information-communications, HVAC, and plumbing systems for office buildings, schools, hospitals, factories, commercial facilities, and residential properties, and additionally installs renewable-energy equipment (solar, micro-hydro, biomass) and LED energy-efficiency upgrades. It holds ZEB Planner registration, ISO9001:2015 certification (Registration Q5091), Health Management Bright 500 recognition, and Diamond Smile Company certification, and offers specialized ZEB (Net Zero Energy Building) planning/consulting services as well as a proprietary container-mounted Mobile Disaster Independent Power Unit for emergency deployment.\n\nThe business runs on project-based, one-time construction contracts with quote-based pricing, executed through a direct field-sales force operating out of 17 offices spanning Yamagata, Miyagi, Fukushima, Ibaraki, and Tokyo. Revenue is generated across four main streams: electrical equipment construction, information-communications equipment construction, HVAC and plumbing installation, and renewable-energy / energy-efficiency installation. Customers are primarily government and public institutions (national hospitals, prefectural high schools, municipal town halls, expressway and tunnel infrastructure), with secondary commercial/industrial clients and a residential long-tail. Tohoku Denka Kogyo also anchors the AIZ Alliance of 16 affiliated companies across Yamagata, Miyagi, and Fukushima, enabling consortium bids on integrated facility projects, and jointly operates the Miharashinookayama Mega Solar Power Plant (since 2014) with Yamagata Panasonic and Yamagata Construction.\n\nFor FY2025 (most recent fiscal year) the company reported revenue of approximately ¥12.04 billion (¥12,037M), versus ¥11.84 billion in FY2024 and ¥12.01 billion in FY2023, on a workforce of 374 employees. Recent strategic actions include a capital alliance with Kobayashi Duct Industries (March 2026), a disaster-response partnership with Yamagata City (January 2026), and entry into the GX Assessment Lease program with Yagin Lease and Mitsubishi HC Capital (September 2025) to support corporate decarbonization financing.

Name

Tohoku Denka Kogyo

Legal name

東北電化工業株式会社

Website

https://tohoku-denka.co.jp

Company type

Private

Founded year

1947

Operating status

Operating

Headcount range

251–500 employees

Short description

Tohoku Denka Kogyo is a Yamagata-based, family-owned electrical construction firm (founded 1947) serving Japanese government, commercial, and residential customers with electrical, communications, HVAC, and renewable-energy installation services across the Tohoku region.

Ownership category

akta.pro rank

Product category

Electrical Construction Services

NAICS

Electrical Contractors and Other Wiring Installation Contractors (23821), Plumbing, Heating, and Air-Conditioning Contractors (238220), Power and Communication Line and Related Structures Construction (237130)

SIC

Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585), Electronic & Other Electrical Equipment (No Computer Equip) (3600)

akta.pro primary industry

Auxiliary Systems EPC (Station Service, HVAC, Fire Protection, Security) (EUAEADAK)

akta.pro secondary industries

Construction Management & General Contracting (EPCM, Scheduling, QA/QC, HSE) (EUAMAFAJ), Chillers, Boilers & Central Plant Operations (BPABACAG), SCADA, Controls & Communications Integration (RTU, Fiber, Networking) (EUAEADAD)

Keywords

• Electrical construction services
• Building electrical systems
• HVAC installation services
• Renewable energy installation
• ZEB planning consulting

Headquarters

HQ city

Yamagata

HQ country

Japan

HQ region

Asia

Offices20 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Electrical Equipment Construction: One-time project-based revenue from electrical equipment design, construction, installation, and maintenance services for buildings, infrastructure, and industrial facilities. Projects range from small residential work to large-scale commercial and government projects.
2. Information Communications Equipment: Communication network design and construction services for government and public institutions.
3. HVAC and Plumbing Equipment: Air conditioning, hot water supply, and plumbing installation services.
4. Renewable Energy and Energy Efficiency: Installation of solar power, micro-hydro, and biomass equipment; LED lighting upgrades; energy efficiency consulting and subsidy application support.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Tohoku Denka Kogyo is a Yamagata-based electrical construction company that designs, builds, and maintains electrical equipment for buildings, infrastructure, and renewable energy systems. Its core services cover electrical equipment construction, information and communication infrastructure, air conditioning and plumbing installation, and renewable energy and energy-saving equipment installation, supplemented by ZEB (Net Zero Energy Building) planning consulting and a proprietary mobile disaster-independent power unit for emergency deployment.

Product overview

Tohoku Denka Kogyo is an electrical construction company offering integrated services from planning and design through construction and maintenance. Their core services include electrical equipment construction for buildings and infrastructure, information and communication equipment construction, air conditioning and plumbing installation, and renewable energy/energy-saving equipment setup. They also provide specialized services such as ZEB (Net Zero Energy Building) planning and the Mobile Disaster Independent Power Unit for emergency response. The company operates as part of the AIZ Alliance with 16 group companies across Yamagata, Miyagi, and Fukushima prefectures.

Differentiator

Problem solved

Functional benefit

Products and services

• Electrical Equipment Construction
• Information and Communication Equipment Construction
• Air Conditioning and Plumbing Equipment Construction
• Renewable Energy and Energy-Saving Equipment Installation
• Mobile Disaster Independent Power Unit
• ZEB Planning and Consulting Services

Quantifiable outcome

• Annual CO2 emissions reduction of approximately 32.3 tons through solar power equipment at headquarters parking lot
• +1 more outcomes

Named customers10 records

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

16 partnerships are on record, tiered major, core and minor.

• 山形市役所 (Yamagata City Government)majorStrategic or Co-development Partner · 13 January 2026Agreement for provision of mobile disaster-independent power units during emergencies. Units can be rapidly deployed to disaster areas via truck mounting.
• 山銀リース株式会社 (Yagin Lease)majorStrategic or Co-development Partner · 24 September 2025Partner in GX Assessment Lease program for supporting corporate decarbonization through lease transactions. Their headquarters parking lot solar project was certified as the first case under this partnership.
• 三菱HCキャピタル株式会社 (Mitsubishi HC Capital)majorStrategic or Co-development Partner · 24 September 2025Partner in GX Assessment Lease program coordinated with Yagin Lease for supporting corporate decarbonization through lease financing for renewable energy equipment.
• 小林duct工業株式会社 (Kobayashi Duct Kogyo)coreStrategic or Co-development PartnerCapital alliance partner joined in March 2026, strengthening the Aiz Alliance group. Kobayashi Duct Kogyo is based in Sagae City and specializes in duct manufacturing.
• システムエンジニヤリング株式会社coreStrategic or Co-development PartnerAiz Alliance member company located at Yamagata City Aota 3-chome
• 光電設株式会社coreStrategic or Co-development PartnerAiz Alliance member company located at Yamagata City Sakuradahigashi
• 東北電化機器販売株式会社coreChannel Partner/ Reseller/ DistributorAiz Alliance member; electrical equipment sales company
• 株式会社トップ・アート・セクションminorStrategic or Co-development PartnerAiz Alliance member company
• 東北電化保安サービス株式会社coreStrategic or Co-development PartnerAiz Alliance member company providing electrical safety services
• 山住設備株式会社coreStrategic or Co-development PartnerAiz Alliance member company; plumbing and facility services
• 株式会社シスモminorStrategic or Co-development PartnerAiz Alliance member company located in Higashine City
• 村山電気工業株式会社minorStrategic or Co-development PartnerAiz Alliance member company located in Murayama City
• 株式会社東部電気minorStrategic or Co-development PartnerAiz Alliance member company located in Yamagata City
• 株式会社さくらんぼカントリークラブminorStrategic or Co-development PartnerAiz Alliance member company; golf course operation
• 株式会社広瀬組minorStrategic or Co-development PartnerAiz Alliance member company located in Sendai City
• 大和電設工業株式会社minorStrategic or Co-development PartnerAiz Alliance member company located in Iwaki City, Fukushima

Scale indicators6 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Yurtec Corporation: Yurtec is a major Japanese electrical construction contractor headquartered in Sendai with deep Tohoku-region roots. It offers electrical facility design, construction, and maintenance for buildings, power infrastructure, and renewable energy, making it the most directly comparable peer to Tohoku Denka Kogyo in terms of geography, service mix, and target customers.
• Nippon Densetsu Kogyo Co., Ltd. Nippon Densetsu Kogyo is a Japanese electrical construction company specializing in railway electrification, power distribution, and electrical facility construction. Its core electrical infrastructure services are highly comparable to Tohoku Denka Kogyo's electrical equipment construction business, though its customer base skews more toward rail and utilities.
• Toko Electrical Construction Co., Ltd. Toko Electrical Construction is a mid-sized Japanese electrical contractor offering power, lighting, communications, and air-conditioning installation for buildings and infrastructure. Its service mix and project-based model closely mirror Tohoku Denka Kogyo's core offerings.
• Dai-Dan Co., Ltd. Dai-Dan is a Japanese mechanical and electrical engineering contractor specializing in HVAC, plumbing, electrical systems, and building equipment installation. Its integrated MEP offering directly parallels Tohoku Denka Kogyo's air-conditioning, plumbing, and electrical equipment construction services.

Broad incumbents

• Kandenko Co., Ltd. Kandenko is one of Japan's largest electrical equipment construction contractors, offering integrated electrical, communications, and energy infrastructure services nationwide. It competes with Tohoku Denka Kogyo on large-scale public and commercial electrical projects but operates at substantially greater scale and geographic breadth.
• Kinden Corporation: Kinden is a leading Japanese electrical construction and facility services firm with operations across power distribution, building electrical systems, and information communications. Its service portfolio overlaps directly with Tohoku Denka Kogyo's electrical equipment and information communications equipment construction streams.
• Sanki Engineering Co., Ltd. Sanki Engineering provides mechanical, electrical, and plumbing construction services for buildings, factories, and infrastructure in Japan. Its HVAC and building systems practice is directly comparable to Tohoku Denka Kogyo's air-conditioning, plumbing, and integrated building equipment services.
• Kyudenko Corporation: Kyudenko is a major Kyushu-based Japanese electrical and air-conditioning contractor with nationwide operations. It competes with Tohoku Denka Kogyo on building electrical and HVAC installations but at substantially larger scale and broader geographic scope.
• Taikisha Ltd. Taikisha is a Japanese industrial HVAC and clean-room systems contractor serving factories, process industries, and commercial facilities. Its HVAC and energy-efficiency practice overlaps with Tohoku Denka Kogyo's air-conditioning and renewable energy services for industrial customers.

Emerging players

• Panasonic Construction Co., Ltd. (Yamagata): Panasonic Construction is a partner in the Miharashinookayama Mega Solar joint venture with Tohoku Denka Kogyo. While broader Panasonic is a multinational, this construction entity is a relevant emerging player in Japan's renewable and energy-efficiency building services market where Tohoku Denka operates.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UCG-uqhXAlkYfDQAfkMMUL4w
• TikToktiktok.com/@tohokudenka

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 records

Subsidiaries13 records

Funding overview

Funding rounds

Investors

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

M&A

Investments

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

Frequently asked questions about Tohoku Denka Kogyo