Ernst Wirth Fertigbau GmbH & Co KG

What Ernst Wirth Fertigbau GmbH & Co KG does

Ernst Wirth Fertigbau GmbH & Co. KG is a family-owned German manufacturer of custom prefabricated transformer stations and technical building components, founded in 1953 and headquartered in Herbrechtingen, Baden-Württemberg. The company designs, manufactures, and delivers turnkey transformer substations from a 15,000 m² in-house production facility, producing approximately 600 stations per year with a team of roughly 60 employees. All manufacturing — including prefabricated reinforced concrete station bodies, doors, and ventilation elements — is performed in-house in Germany, with the company operating its own transport fleet for delivery and commissioning.

The product portfolio comprises four core transformer station types (walkable stations for switchhouses and transformer buildings up to 4,000 kVA; compact space-saving stations; intelligent local grid stations with digital monitoring and remote control; and EV fast-charging stations), plus standalone retrofit doors and ventilation elements. Stations are custom-engineered in 5-cm dimensional increments up to 25 x 3 x 3 m, with multiple arc-fault safety certifications per IEC 62271-202 and pioneering SF6-free technology validated in 2024. Customers include municipal and regional utilities (Stadtwerke, EnBW), industrial firms (Festo, Peter Gross Bau, SLI Logistics), renewable energy projects, and e-mobility infrastructure operators (Schneider Electric / Ionity for Tesla Superchargers, Belectric), with sales coverage across Germany (Baden-Württemberg, Bavaria) and Austria via IB Rauscher.

The business model is project-based one-time sales of custom-engineered, turnkey-delivered physical assets, with pricing conducted on a quote basis (no standardized public pricing) and complemented by post-installation maintenance, repair, and refit services. Go-to-market is direct enterprise field sales with named regional representatives and personal consultation, supported by a company website, trade fair presence, and local SEO. The company has remained in family ownership since 1953, is ISO 9001:2015 certified, and reports no institutional investors or parent-company structure.

Name

Ernst Wirth Fertigbau GmbH & Co KG

Legal name

Ernst Wirth Fertigbau GmbH & Co. KG

Website

https://wirth-fertigbau.de

Company type

Private

Founded year

1953

Operating status

Operating

Short description

Ernst Wirth Fertigbau GmbH & Co. KG is a family-owned German manufacturer (founded 1953) of custom prefabricated transformer stations and building components, serving energy utilities, industrial companies, and e-mobility infrastructure operators across Germany and Austria.

Ownership category

akta.pro rank

Product category

Transformer Stations (Electrical Power Distribution Equipment)

NAICS

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

SIC

Power, Distribution & Specialty Transformers (3612), Switchgear & Switchboard Apparatus (3613), Electrical Industrial Apparatus (3620)

akta.pro primary industry

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

akta.pro secondary industries

Switching Stations & Reactive Power Facilities (Capacitor Banks, SVC/STATCOM) (IMAFAHAH), Reactive Power & Power Quality Equipment (Capacitor Banks, Reactors, STATCOM/SVC, Harmonic Filters) (IMAGAAAG)

Keywords

• Prefabricated transformer stations
• Compact substations
• Switchgear buildings
• Power distribution infrastructure
• EV charging stations

Headquarters

HQ city

Herbrechtingen

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Custom Transformer Stations (Begehbar & Kompakt): Sale of custom-built, prefabricated transformer substations manufactured to individual customer specifications. Includes electrical switchgear, transformers, control systems, and building shell as a complete turnkey solution. One-time delivery per project.
2. Intelligent Local Grid Stations: Smart/digital transformer stations for intelligent power grid management, integrating remote monitoring, measurement, and control technology with digital connectivity.
3. EV Fast Charging Stations: Custom-built charging infrastructure stations for electric vehicles, integrating fast charging technology, transformers, and switchgear for public and fleet charging applications.
4. Retrofit Doors and Ventilation Elements: Replacement and upgrade doors and ventilation elements for existing transformer stations and technical buildings. Custom-made to order in aluminum or painted variants with various locking and security features.
5. Standalone Ventilation Elements: Discrete ventilation elements including Jalousies, closable ventilation flaps, pressure relief systems, and fire protection dampers, sold as standalone products for use in concrete stations and technical buildings.
6. Maintenance, Repair, and Refit Services: Post-construction support including complementary requests, maintenance, repair, and refit services. Company offers ongoing service relationship after initial station delivery.

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

Ernst Wirth Fertigbau GmbH & Co. KG designs, manufactures, and delivers custom prefabricated transformer stations (walkable, compact, intelligent local grid, and EV fast charging) made from reinforced concrete with integrated electrical switchgear, transformers, and control technology. All stations are custom-built to customer specifications in 5-cm dimensional increments, factory-assembled, and delivered turnkey with the company's own transport fleet. The company also produces retrofit doors and ventilation elements for existing transformer stations and technical buildings.

Product overview

Ernst Wirth Fertigbau GmbH & Co. KG is a family-owned prefabricated construction specialist based in Herbrechtingen, Baden-Württemberg, founded in 1953. The company manufactures custom transformer stations (Trafostationen) and technical buildings for energy suppliers, industrial enterprises, and construction firms. The product portfolio centers on four transformer station types: Begehbare Trafostationen (walkable stations for switchhouses, transformer buildings, converter buildings), Kompakt-Trafostationen (compact space-saving stations), Intelligente Ortsnetzstationen (smart grid stations with remote monitoring capabilities), and Schnellladestationen (EV charging stations). Supporting the core offerings are two building component products: Retrofit Tür- und Lüftungselemente (custom doors and ventilation for retrofit projects) and Lüftungselemente (ventilation solutions). All products are manufactured in-house in Baden-Württemberg with company-employed electricians, delivered turnkey with high-quality switchgear and control technology. The company produces approximately 600 transformer stations annually with a team of over 60 employees.

Differentiator

Problem solved

Functional benefit

Products and services

• Begehbare Trafostationen (Walkable Transformer Stations) Walkable prefabricated transformer stations delivered turnkey, customizable for switchhouses, transformer buildings, converter buildings, transfer stations, or special stations. Sizes range from 1.5x1.2m to 9x4m, with capacity up to 4,000 kVA for industrial applications. Designed for energy utilities and industrial buyers requiring on-site layouts with internal access.
• Kompakt-Trafostationen (Compact Transformer Stations) Space-saving compact transformer stations with overhead construction featuring separate transformer, medium voltage, and low voltage compartments made of reinforced concrete C 35/45. Designed for various plot situations with different station floor plans. Targeted at energy utilities and developers needing compact, non-walkable stations for distribution networks.
• Intelligente Ortsnetzstationen (Intelligent Local Grid Stations) Smart transformer stations for efficient control of future-proof smart grids, equipped with digital control, measurement, and remote operation technology. Features a thermally and arc-fault-separated IKT niche for sensitive technology, fernwirkschrank for remote monitoring, grid state determination, fault location detection, remote-controlled load-break switches, and demand-responsive power routing to buffer storage or EV charging stations. Targeted at municipal utilities and grid operators.
• Schnellladestationen Elektromobilität (Fast Charging Stations for E-Mobility) Custom-designed charging stations for electric vehicles, tailored to technical and spatial specifications, integrating modern high-efficiency charging technology with transformers and switchgear for public and private fleet applications. Designed for charging infrastructure operators and developers building DC fast charging hubs.
• Retrofit Türen und Lüftungselemente (Retrofit Doors and Ventilation Elements) Custom-manufactured doors and ventilation elements for transformer stations in solid craftsmanship quality, for retrofit and upgrade projects. Includes anodized aluminum doors or custom-colored options, single and double-wing versions, 3-point locking, multi-point locking variants, and arc-fault-tested door generation with 3D adjustable hinges.
• Lüftungselemente (Ventilation Elements) Stainless steel (V2A) supply and exhaust air elements integrated into doors, available in any size with IP23DH protection against poking, reliable insect protection, and options for dampers or pressure relief functions. Includes rigid ventilation louvers, closable ventilation flaps, pressure relief systems, and fire dampers for concrete stations and technical buildings.

Quantifiable outcome

• 600 transformer stations manufactured and delivered per year
• +3 more outcomes

Named customers14 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Eight partnerships are on record, tiered core and minor.

• MüAG (Giengen) / SiemenscoreStrategic or Co-development Partner · 1 January 1963Original cooperation started in 1963 with energy utility MüAG in Giengen and Siemens for development and construction of transformer stations. Led to a major order for 70 stations and marked the company's entry into transformer station manufacturing.
• Studiengesellschaft für Hochspannungsanlagen (FGH) MannheimcoreTechnology or IntegrationArc-fault safety testing partner. Conducted arc-fault tests on Wirth concrete stations in 1972, 1998, 2006, 2008, and 2020. Critical for regulatory compliance and certification of safety standards.
• IPH Berlin (Institut für Prüftechnik)coreTechnology or IntegrationTesting partner for arc-fault safety certifications. Conducted SF6-free arc-fault test with Siemens 8DJH24 blueGIS in 2020 and further tests with SF6-free switchgear from Schneider and ABB in 2025.
• Schneider Electric / IonitycoreStrategic or Co-development PartnerStrategic partnership for Tesla Supercharger station construction. Wirth supplies approximately two-thirds of Tesla Supercharger stations in Germany, manufactured as transformer stations for Ionity. Features 6 winding transformers per station.
• BelectriccoreStrategic or Co-development PartnerPartnership for electric vehicle fast charging infrastructure. Wirth supplied transformer station for Metro Konzept Duisburg fast charging station capable of charging up to 4 vehicles simultaneously.
• Kries EnergietechnikminorStrategic or Co-development PartnerCooperation partner developing modern prototypes for intelligent local grid stations. Wirth supplies the building shell; Kries installs the electrical technology. Live testing of prototypes conducted together.
• IB Rauscher GmbHminorChannel Partner/ Reseller/ DistributorSales representative for Austria under the brand Trafostation.at. Martin Rauscher manages sales for the Austrian market from IB Rauscher GmbH.
• SCHULTZ Online-MarketingminorGTM or Marketing PartnerMarketing support partner providing online marketing services for the company's website and digital presence.

Scale indicators6 records

Recent moves9 records

Expansion highlights6 records

Broad incumbents

• Siemens Energy: Global energy technology incumbent offering complete prefab substations, switchgear, and grid solutions. Supplies SF6-free blueGIS switchgear used inside Wirth stations but also competes as a vertically integrated substation provider to the same utility customers.
• ABB: Global electrical equipment leader with prefab/compact substations and SF6-free switchgear. Recently tested SF6-free switchgear inside Wirth stations (2025) while also selling its own integrated substation solutions to utilities and industrial customers.
• Schneider Electric: Global energy management and automation major; supplies switchgear (incl. SF6-free) into Wirth stations and is Wirth's strategic partner for Tesla/Ionity Supercharger builds. Also competes in the prefab substation market with its own integrated offerings.
• Eaton: Global power management company offering medium-voltage switchgear, compact substations, and grid components to utilities and industrial customers. Competes broadly with Wirth in prefab substation and power-distribution equipment.

Direct peers

• Ormazabal: Spanish-headquartered specialist in medium-voltage switchgear and prefabricated compact substations for utilities and renewables. Direct competitor in the same product category (compact/walk-in transformer stations) across European markets.
• Driescher (Driescher Wegberg): German manufacturer of air- and SF6-insulated switchgear and compact substations. Long-standing switchgear supplier to Wirth with arc-fault-tested integrations, and competes for similar municipal-utility and industrial transformer-station projects in Germany.
• BELUK GmbH: German manufacturer of medium-voltage switchgear and compact substation solutions. Supplied switchgear into Wirth's compact station W 3119 (2006 arc-fault test) and competes for the same regional utility and industrial projects.

Emerging players

• CG Power and Industrial Solutions: India-headquartered electrical equipment group with growing European presence in transformers and switchgear. Increasingly active in compact substations and grid modernization projects that overlap with Wirth's customer base.
• Lucy Electric: UK-based specialist in medium-voltage switchgear and secondary distribution substations. Targets similar municipal-utility and renewable integration use cases as Wirth across European markets.

Others

• Trench Group: Specialist in power transformer components (reactors, coils, neutral-point formers — including the 3.3 MVA arc-suppression coil supplied for Kraftwerk Glatzing-Rüstorf). Adjacent enabling player rather than direct competitor, but addressing the same grid-equipment value chain.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks1 record

Key highlights7 records

Customer concentration

• Facebookfacebook.com/ernst.wirth.fertigbau

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 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 Ernst Wirth Fertigbau GmbH & Co KG