Daihen Electric Co.

What Daihen Electric Co. does

Daihen Electric Co., Ltd. is Thailand's first power transformer manufacturer, established in August 1989 with registered capital of THB 600M (~US$19M) under a technology licensing agreement with DAIHEN Corporation of Japan, which has over 90 years of transformer manufacturing experience dating to 1919. The company designs and manufactures medium and large power transformers (capacity 3-500 MVA, voltage up to 300 kV), including 2-winding and 3-winding power transformers, auto transformers, inter-bus transformers, generating transformers, unit auxiliary transformers, single phase transformers, and shunt reactors rated up to 550 kV. Manufacturing is performed at a 78,300 m² facility in Bang Pakong, Chachoengsao, with annual production capacity of 10,000 MVA, and full in-house capabilities spanning coil winding, core assembly, tank fabrication, radiator production, vapour-phase drying, and high-power testing (including 460 kV / 690 kVA HV testing and 1,600 kV impulse generators). A new factory completed in June 2012 expanded the product envelope to 500 MVA / 300 kV units.

The company has supplied more than 870 transformers to date, with anchor Thai customers including the Provincial Electricity Authority (146 units), Metropolitan Electricity Authority (45 units), and Electricity Generating Authority of Thailand (29 units). It has also exported to Japan (Kansai Electric Power, 46 units), Malaysia (Tenaga Nasional Berhad, Sabah Electricity, Tanjung Bin Power), Saudi Arabia (Saudi Aramco), and 30+ other countries spanning Southeast Asia, the Middle East, Africa, Oceania, and Latin America. Beyond manufacturing, Daihen provides full lifecycle services including installation, removal, relocation, pre-commissioning testing, repair, preventive maintenance, OLTC maintenance, oil treatment and DGA-based oil testing, and technical training.

Revenue is generated primarily through one-time hardware sales of custom-engineered power transformers (bid-based pricing on capacity, voltage, and configuration) plus aftermarket professional services revenue tied to the installed base. The go-to-market is direct enterprise field sales through a dedicated Bangkok Sales Office and factory-direct contact. Quality is validated by KEMA short-circuit test certification (Netherlands, 1997), ISO 9001 (2002), ISO 14001 (2008), ISO 17025 laboratory accreditation, and a Thai Green Industry certificate. The company is a private limited entity under Thai jurisdiction, operating as a subsidiary of DAIHEN Corporation with no disclosed ownership beyond the licensing relationship.

Name

Daihen Electric Co.

Legal name

DAIHEN ELECTRIC CO.,LTD.

Website

https://daihen.co.th

Company type

Private

Founded year

1989

Operating status

Operating

Headcount range

101–250 employees

Short description

Daihen Electric Co., Ltd. is Thailand's first power transformer manufacturer, producing custom medium and large power transformers (3-500 MVA, up to 300 kV) and shunt reactors under technology licensed from DAIHEN Corporation (Japan). It serves state electric utilities, power generators, and industrial customers across 30+ countries, with full in-house manufacturing and lifecycle services.

Ownership category

akta.pro rank

Product category

Power Transformer Manufacturing

NAICS

Power, Distribution, and Specialty Transformer Manufacturing (335311)

SIC

Power, Distribution & Specialty Transformers (3612)

akta.pro primary industry

Transformers (Power, Distribution, Instrument, Specialty) (IMAGAAAA)

akta.pro secondary industries

Power Transformers, Reactors & Auxiliary Power Systems (EUADACAJ), Transformer & Reactor Refurbishment / Replacement Programs (EUAEALAE)

Keywords

• Power transformers
• Shunt reactors
• Transformer manufacturing
• Transformer services
• Industrial power equipment

Headquarters

HQ city

Chachoengsao

HQ country

Thailand

HQ region

Asia

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Power Transformer Sales: One-time hardware sales of custom power transformers including 2-winding and 3-winding power transformers, auto transformers, inter-bus transformers, generating transformers, unit auxiliary transformers, single phase transformers, and shunt reactors. Products range from 3-500 MVA capacity and up to 300 kV voltage rating.
2. Transformer Services: Aftermarket services including transformer installation, removal, relocation, pre-commissioning, repairing, preventive maintenance, OLTC maintenance, oil treatment and testing, and training services.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels2 records

Core offering

Daihen Electric Co., Ltd. designs and manufactures medium and large power transformers (rated 3–500 MVA, voltage 36–300 kV) including 2-winding, 3-winding, auto, inter-bus, generating, unit auxiliary, and single-phase units, as well as shunt reactors up to 550 kV, under technology licensed from DAIHEN Corporation of Japan. The company also delivers the full lifecycle transformer service stack — installation, removal, relocation, pre-commissioning tests, repair, preventive maintenance, OLTC service, oil treatment and testing, and customer training — from its Bang Pakong factory and Bangkok sales office.

Product overview

Daihen Electric Co. is Thailand's first power transformer manufacturer, producing medium and large power transformers with capacities ranging from 3 to 500 MVA and voltages up to 300 kV (with Shunt Reactors up to 550 kV). The product portfolio centers on core transformer products including Power Transformers (2 and 3 windings), Auto Transformers, Inter-bus Transformers, Generating Transformers, Unit Auxiliary Transformers, Single Phase Transformers, and Shunt Reactors. The company operates a new factory completed in June 2012 for manufacturing large power transformers up to 300 kV and 500 MVA. Beyond manufacturing, Daihen offers comprehensive lifecycle services including transformer installation/removal/relocation, pre-commissioning testing (insulation resistance, tan delta, capacitance, short circuit impedance, voltage ratio, vector group, winding resistance, BCT tests), repairing, preventive maintenance, OLTC maintenance, oil treatment (dehumidifying and degassing), oil testing (DGA, breakdown voltage, water content), and training services. The company also provides in-house transformer testing facilities compliant with ANSI, IEC, BS, JEC standards, capable of testing up to 500 MVA and 300 kV transformers.

Differentiator

Problem solved

Functional benefit

Products and services

• Power Transformer (2-Winding & 3-Winding) Medium and large 2-winding and 3-winding power transformers rated 3–500 MVA, voltage 36–300 kV, manufactured in-house for electric utilities, IPPs, and large industrial customers.
• Auto Transformer Auto transformers for power distribution and industrial applications, manufactured within Daihen Electric's standard power transformer range.
• Inter-bus Transformer Transformers designed for inter-bus connections within electrical power systems, used by utilities and large substations.
• Generating Transformer Transformers for power generation facilities (IPP, cogeneration, utility generators), including units up to 120 MVA delivered to Tanjung Bin Power (Malaysia) and 100 MVA 150 kV units exported to Indonesia.
• Unit Auxiliary Transformer Auxiliary transformers for power-generation unit support systems, supplied alongside generating transformers to power stations.
• Single Phase Transformer Single-phase power transformers for distribution and special-purpose electrical applications in utility and industrial settings.
• Shunt Reactor Shunt reactors for reactive power compensation in high-voltage transmission systems, rated up to 550 kV.
• Transformer Installation, Removal and Relocation Service End-to-end transformer installation, removal, and relocation services performed for utility and industrial customers.
• Transformer Pre-Commissioning Service Comprehensive pre-commissioning tests including insulation resistance, tan delta, capacitance, magnetizing current, short-circuit impedance, voltage ratio, vector group, winding resistance, and BCT tests.
• Transformer Repair Service Professional repair services for power transformers, supporting lifecycle restoration of units in the field.
• Transformer Preventive Maintenance Service Scheduled preventive maintenance programs designed to ensure transformer reliability and longevity across the installed base.
• OLTC Maintenance Service On-Load Tap Changer (OLTC) maintenance services for voltage-regulating transformers in utility and industrial service.
• Transformer Oil Treatment Service Transformer oil dehumidifying and degassing treatment services to restore dielectric performance of insulating oil.
• Transformer Oil Test Service Transformer oil analysis including Dissolved Gas Analysis (DGA), breakdown voltage tests, and water content analysis for condition monitoring.
• Transformer Training Service Technical training services for customer personnel on transformer operation and maintenance best practices.
• In-House Transformer Testing Service Full-load temperature-rise, impedance, dielectric, impulse, and Dissolved Gas Analysis (DGA) testing performed in Daihen Electric's own high-power laboratory (KEMA-style tests included).

Quantifiable outcome

• 870+ transformers supplied to domestic and overseas customers
• +2 more outcomes

Named customers13 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

One partnership is on record.

• DAIHEN CorporationcoreTechnology or Integration · 1 August 1989Technology licensing partnership with DAIHEN Corporation, Japan. DAIHEN Corporation established in 1919 with 90+ years of transformer manufacturing experience. Provides technical know-how, manufacturing expertise, and technology transfer for power transformer production. This is the foundational technology partnership enabling Daihen Electric's manufacturing capabilities.

Scale indicators7 records

Recent moves7 records

Expansion highlights4 records

Broad incumbents

• Hitachi Energy: Global leader in transformers (including large power and HVDC converter transformers), switchgear, and grid integration. Competes in the same tender processes against Daihen Electric for utility-scale transmission projects globally.
• Siemens Energy (Transformers Business): Global manufacturer of large power transformers (including HVDC converter transformers) and grid technology. Competes with Daihen Electric on EHV-class projects worldwide and offers broader portfolio across the value chain.
• Toshiba Energy Systems & Solutions Corporation: Manufactures large power transformers up to UHV/EHV levels and is the direct parent technology lineage through DAIHEN Corporation's transformer heritage. Competes head-to-head with Daihen Electric in Asia and Middle East.
• WEG S.A. Brazilian diversified electrical equipment manufacturer producing power and distribution transformers for utilities and industry. Competes in Latin American, African, and Southeast Asian transformer markets similar to Daihen Electric's export footprint.

Direct peers

• Voltamp Energy SAOG: Oman-based manufacturer of oil-immersed power and distribution transformers serving Middle East, African, and South Asian utility and industrial customers. Closely comparable in scale and product mix to Daihen Electric.
• Tirathai Public Company Limited: Thailand-listed power transformer manufacturer with comparable medium and large power transformer product portfolio (up to 500 MVA), serving similar Thai and ASEAN utility customers including EGAT and PEA. Most directly comparable Thai-based competitor.
• Hyundai Electric & Energy Systems: Korean manufacturer of power transformers (up to 800 kV/UHV), switchgear, and rotating machinery. Competes with Daihen Electric in Southeast Asian, Middle Eastern, and African utility tenders and serves as a regional Asian technology peer.
• CG Power & Industrial Solutions Limited: Indian manufacturer of power transformers (up to 800 kV), reactors and allied T&D equipment exporting globally to utilities in Middle East, Africa, and Southeast Asia. Directly competes with Daihen on price-sensitive international tenders.

Others

• Schweitzer Engineering Laboratories (SEL): US-based provider of protection, automation, and monitoring solutions for power systems, including transformer monitoring and dissolved gas analysis. Adjacent technology supplier in the same grid infrastructure ecosystem where Daihen Electric's transformers are deployed.

Emerging players

• TBEA Co., Ltd. Chinese transformer manufacturer with strong export push into ASEAN, Middle East, Africa, and Latin America on highly competitive pricing. Represents the principal low-cost competitive threat to Daihen Electric's international tender pipeline.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/daihen-electric-co-ltd-

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Daihen Electric Co.