What ZREW Transformatory does

ZREW Transformatory S.A. is a Polish manufacturer of oil-immersed power and distribution transformers, headquartered in Łódź, Poland (ul. Rokicińska 144). Founded in 1999, the company produces power transformers with capacity up to 160 MVA, along with distribution transformers, cast resin dry-type transformers, and instrument current and voltage transformers. Its operations center on heavy-electrical manufacturing — copper/steel winding and assembly, oil impregnation and testing — supplying transmission-and-distribution-grade equipment for power plants, combined heat and power plants, wind farms, and electrical distribution networks.

The company serves a focused set of B2B enterprise customers in the European utility, renewable energy, and industrial sectors. Named end-customers include Iberdrola (wind-farm transformers in Poland), Eurolaite Oy (battery energy storage system projects in Finland), SAK (St. Gallisch-Appenzellische Kraftwerke AG, distribution transformer supply contract), and Stadtwerk Winterthur (multi-year distribution transformer agreement). Sales are conducted via direct enterprise engagement and competitive tenders targeting utility engineering and procurement teams; project cycles are long and revenue is transaction-based on hardware shipments rather than recurring software or service contracts.

ZREW operates as a wholly-owned subsidiary of R&S Group Holding AG, a SIX Swiss Exchange-listed (RSGN) electrical infrastructure group that also includes Rauscher & Stoecklin, Tesar, and Kyte Powertech. The parent structure provides ZREW with multinational sales reach, shared engineering resources, and group-level capital access. Recent operational milestones include the April 2025 inauguration of a new distribution transformer plant in Krzeczów, Poland, and a January 2024 partnership with Eurolaite Oy extending the company's footprint into Northern European energy storage projects. Pricing is project-specific and not publicly disclosed; revenue figures are not separately reported from the parent.

Name

ZREW Transformatory

Legal name

ZREW Transformatory S.A.

Website

https://zrew-transformatory.pl

Company type

Private

Founded year

1999

Operating status

Operating

Short description

ZREW Transformatory S.A. is a Łódź-based Polish manufacturer of oil-immersed power transformers up to 160 MVA and distribution transformers, serving European utilities, wind farms, cogeneration plants, and industrial customers as a subsidiary of SIX-listed R&S Group.

Ownership category

akta.pro rank

Product category

Power and Distribution Transformer Manufacturing

NAICS

Power, Distribution, and Specialty Transformer Manufacturing (335311), Switchgear and Switchboard Apparatus Manufacturing (335313)

SIC

Power, Distribution & Specialty Transformers (3612), Switchgear & Switchboard Apparatus (3613), Electronic Coils, Transformers & Other Inductors (3677)

akta.pro primary industry

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

akta.pro secondary industries

Power Transformers, Reactors & Auxiliary Power Systems (EUADACAJ), Instrument Transformers (CTs/VTs) & Sensors (Conventional/Optical) (EUADACAG), Transformer & Reactor Refurbishment / Replacement Programs (EUAEALAE)

Keywords

• Power transformer manufacturing
• Distribution transformers
• Oil-immersed transformers
• Electrical infrastructure equipment
• Industrial cast resin transformers

Headquarters

HQ city

Lodz

HQ country

Poland

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Transformer Manufacturing and Sales: ZREW generates revenue through the manufacture and sale of power transformers, distribution transformers, and special industrial transformers. Revenue is primarily one-time transactional (project-based) with long sales cycles typical of heavy electrical infrastructure. As part of R&S Group, the company serves global markets through the parent company's distribution network.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

ZREW Transformatory manufactures oil-immersed power transformers up to 160 MVA, oil-immersed distribution transformers, cast resin dry-type transformers, and instrument (current and voltage) transformers for power generation, transmission, distribution, wind farm, and industrial applications. The portfolio additionally includes overhead line switches, railway electrification switches, distribution boards, switchgear, high-current electrical connectors, and after-sales service and support delivered through parent R&S Group.

Product overview

ZREW Transformatory is a Polish manufacturer of power transformers and electrical infrastructure equipment, operating as part of the R&S Group. The product portfolio centers on oil-immersed power transformers (up to 160 MVA for distribution, up to 120 MVA for power transformers) and includes distribution transformers, cast resin transformers, and current/voltage transformers. The offering extends to switching equipment including overhead line switches and railway electrification components, electrical distribution boards, switchgear, and high-current connectors. The company provides comprehensive service and support as an integrated component of its product offering. ZREW serves power generation facilities, combined heat and power plants, wind farms, distribution networks, and industrial applications.

Differentiator

Problem solved

Functional benefit

Products and services

• Power Transformers (Transformatory mocy) High-efficiency oil-immersed power transformers with capacity up to 160 MVA, designed for power plants, combined heat and power plants, wind farms, and distribution networks.
• Distribution Transformers (Transformatory rozdzielcze) Oil-immersed distribution transformers designed for electrical distribution networks, with extended supply contracts for utility customers including SAK and a five-year delivery contract with Stadtwerk Winterthur.
• Cast Resin Transformers (Transformatory żywiczne) Dry-type resin transformers for industrial applications requiring fire safety or installation in sensitive environments.
• Current and Voltage Transformers (Przekładniki prądowe i napięciowe) Instrument transformers for current and voltage measurement in electrical systems.
• Overhead Line Switches (Łączniki napowietrzne) Switching equipment for overhead power lines and railway electrification systems.
• Distribution Boards (Tablice rozdzielcze) Electrical distribution boards for power management in industrial and infrastructure installations.
• Electrical Switchgear (Rozdzielnice elektryczne) Electrical switchgear assemblies for power distribution and control applications.
• High-Current Electrical Connectors (Wysokoprądowe złącza elektryczne) High-current electrical connection solutions for industrial applications.
• Service and Support (Serwis i wsparcie) Comprehensive after-sales support, maintenance, and service solutions offered by R&S Group for transformer products.

Quantifiable outcome

• Successfully delivered power transformers for battery energy storage systems in Finland in cooperation with Eurolaite Oy

Named customers4 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

Two partnerships are on record, tiered core.

• Eurolaite OycoreStrategic or Co-development Partner · 1 January 2024Finnish partner company. ZREW produced and delivered power transformers for battery energy storage systems (BESS) in Finland in cooperation with Eurolaite Oy. This partnership enables ZREW to serve the growing energy storage market in Northern Europe.
• R&S GroupcoreOthers · 1 January 2015R&S Group Holding AG (SIX: RSGN) acquired ZREW in 2015, making it a subsidiary. R&S Group is a leading provider of electrical infrastructure products serving key markets globally. ZREW operates as a brand within the R&S Group portfolio alongside Rauscher & Stoecklin, Tesar, and Kyte Powertech.

Scale indicators3 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• GE Vernova: GE's grid solutions spinoff including large power transformers. Competes in the same utility and renewable transformer market with deeper R&D and global service network.
• Siemens Energy: Major manufacturer of power and distribution transformers as part of its broader grid technologies portfolio. Competes with ZREW on utility and industrial transformer tenders globally.
• Hitachi Energy: Global leader in transformers, grid integration, and HVDC systems (formerly ABB Power Grids). Competes for the same large utility and renewable tenders but at much higher voltage/MVA classes and broader portfolio scale.
• Eaton: Diversified power management company offering distribution transformers, switchgear, and related grid equipment. Competes with ZREW for industrial and utility distribution orders in Europe.
• Schneider Electric: Global electrical equipment conglomerate offering distribution transformers and switchgear. Overlaps with ZREW in distribution-network and industrial customers, though transformers are one of many lines.

Regional players

• Wilson Transformer Company: Australian transformer manufacturer focused on power and distribution transformers for utilities and renewables. Comparable product range but primarily serves Australia-Pacific rather than European markets.

Direct peers

• Hyundai Electric: Korean manufacturer of power and distribution transformers up to large MVA classes, with growing European market presence. Comparable product offering and overlap in renewable-energy and utility customers.
• Rauscher & Stoecklin: Sister company within R&S Group; produces transformers, switchgear, and connectors for utilities, rail, and industry. Closely aligned product mix and overlapping European utility customer base.
• Tesar: Sister company within R&S Group; manufactures distribution and power transformers, including cast resin units. Directly comparable product portfolio and customer segments (utilities, renewables, industrial).
• Kyte Powertech: Sister company within R&S Group; Irish manufacturer of distribution transformers. Comparable product category with focus on European utility customers.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/zrew-transformatory-s.a.

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 ZREW Transformatory