Who we are

Our experience in the production of distribution, power and other various types of world class transformers reaches back to the year 1923. Current products include power transformers (single and three phased regulating and non regulating), auto transformers, furnace transformers, traction transformers and chokes for use in the rail industry as well as special reactors.

In the proud engineering legacy of Skoda, ETD transformers are designed, manufactured and tested and then transported to customers world wide by combining tradition, modern design and manufacturing principles. All transformers are delivered at site, installed, tested and commissioned meeting EU and other international and site specific norms and specifications.

Part of our factory is Electrical Testing Laboratory, which offers a wide range of accredited and non-accredited tests.

Facts and figures

Annual production capacity

2 400 - 2 800 MVA

Production space

The overall floor space of 25 400m² is used up by production (11 600m²), storage (8 500m²) and logistics (10 500m²). The rest is used for offices. Additional space is available in our older storage halls if needed. Unused storage space in Pilsen can currently be rented, please ask for a quotation.výrobní

Office space

Additional 5 000 m² are used as office space.

Employee count

Out of the 168 employees, 89 are blue collar and 78 white collar. Our team features 41 experienced electro-technical engineers.


Most of our clients are situated abroad. Over 65% of our production is exported. We are a national market leader and a significant regional producer.

Our history

As the former Skoda transformer factory, this plant has a proud history of producing distribution, power and other various types of world class transformers dating back to 1923. The factory is located on the old Skoda brick factory site developed in 1918 – 1919 in Doudlevce, Pilsen close to Prague.

The production started in 1921 and included the electrotechnical assembly for engineering supplies, components for heavy-current electrotechnical engineering, ener­gy and electric traction units. The first transformer has been produced in 1923 and first traction transformer has been succesfully produced in 1965. We have decided to abandon the wide range of products and instead  focus only on the production of transformers, choke coils and reactors. 

Since 2004 ETD TRANSFORMATORY is a proud member of the International BEZ Group. The privately owned International BEZ Group, based in Bratislava, the Slovak Republic is a transformer power house in central Europe. The holding company combines a significant amount of transformer knowledge and expertise of some of the most respected and renowned European producers and service companies of small, medium and large power transformers in one group.

Quality and certificates

ETD TRANSFORMÁTORY a.s. is a traditional significant manufacturer and supplier of high-quality and reliable power transformers and other products and services in the field of electric non-rotating machines for power engineering, industry and railway transport.

The company’s highest priorities include the quality of products and services, environmental protection, occupational health & safety, satisfaction of customers, owners, employees, suppliers and the entire company.

The Company has introduced an integrated management system with certification according to EN ISO 9001, EN ISO 14001, BS OHSAS 18001, EN ISO 3834-2.

Our Policy of Integrated Management System can be seen here.

The scope of our integrated management system can be found here.

Important certificates

Certificate for the Quality Management System under EN ISO 9001:2015

Certificate for the Environmental Management System under EN ISO 14001:2015

Certificate for the Occupational Health and Safety Management System under ISO 45001:2018

Certificate for the Welding Process under EN ISO 3834-2:2005

Certificate of accreditation for Electrotechnical Testing Laboratory (L1526) under ČSN EN ISO/IEC 17025:2018

Certificate of Competence for Testing Activities of the Test room E 11

Certificate of a Supplier’s Technical Competence for the Czech railways


The above mentioned certificates can be downloaded here.

Career opportunities

We currently do not have any vacant positions. However, please share your CV with us and we will make sure to carefully consider each applicant.

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