What Frerk Aggregatebau does

Frerk Aggregatebau GmbH is a German Mittelstand manufacturer of low-voltage and medium-voltage emergency power systems (Netzersatzanlagen), uninterruptible power supply (USV) systems, and bespoke generator sets (Stromaggregate), headquartered in Schweringen with a second service site in Lemke. Since 1964, the company has designed, manufactured, tested (in-house per ISO 8528 on up to 19 full-load test stands), installed, commissioned, and serviced turnkey backup power solutions for critical infrastructure operators (water utilities, hospitals, KRITIS facilities), data centers, oil & gas installations, decentralized industrial power, and peak-load/balancing energy providers. Its core technology stack combines in-house mechanical fabrication (including a proprietary pipe bending system for container installations) with system integration of motors, batteries, generators, and controls sourced from brand-name manufacturers such as DEIF.

The business operates a project-based revenue model built around custom-engineered one-off and small-series systems, complemented by a smaller standard-product line sold directly to private households, events, and commercial buyers, plus recurring aftermarket service, maintenance, spare parts, modernizations, and optional 24/7 emergency support that is manufacturer-independent. Pricing is quote-based rather than published, reflecting the custom nature of the work. Distribution is exclusively direct enterprise field sales with international reach. Certified to ISO 9001:2015 (DQS), as a specialist welding company (DVS), specialist company per AWSV, and holder of TÜV NORD, IQNET, and EcoCockpit credentials, with an EcoVadis Bronze Medal awarded in 2026. Following DEUTZ AG's acquisition in February 2026, Frerk operates as a wholly-owned subsidiary within DEUTZ's energy solutions segment, with active capacity expansion in progress via a new container-focused production Hall 6 and an on-site photovoltaic-plus-storage system.

Name

Frerk Aggregatebau

Legal name

Frerk Aggregatebau GmbH

Website

https://frerk-aggregatebau.com

Company type

Private

Founded year

1964

Operating status

Operating

Headcount range

101–250 employees

Short description

Frerk Aggregatebau (Schweringen, Germany) is a 1964-founded manufacturer of custom low- and medium-voltage emergency power generators, NEA/USV systems, and container-based power solutions, serving critical infrastructure operators, data centers, oil & gas, and industrial clients with end-to-end design, in-house testing, installation, and aftermarket service.

Ownership category

akta.pro rank

Product category

Emergency Power Generation Systems

NAICS

Turbine and Turbine Generator Set Units Manufacturing (333611), Engine, Turbine, and Power Transmission Equipment Manufacturing (3336)

SIC

Motors & Generators (3621), Electronic & Other Electrical Equipment (No Computer Equip) (3600), Engines & Turbines (3510)

akta.pro primary industry

Backup & Resilience Power Systems (Standby Generators, Critical Facilities) (EUACALAG)

akta.pro secondary industries

Engine Generator & Microgrid Power Plant EPC (Diesel/Gas Recip) (EUAEAAAJ), UPS Systems & Backup Power (Online/line-interactive UPS, industrial backup) (IMAGADAD), Dispatchable Distributed Generation (Gas Reciprocating Engines, Microturbines) (EUACALAI), Backup Power & Critical Power Systems (Generators/UPS) (IMAIABAJ)

Keywords

• Emergency power systems
• Generator sets manufacturing
• Uninterruptible power supply
• Backup power solutions
• Critical infrastructure power

Headquarters

HQ city

Schweringen

HQ country

Germany

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Custom power generation systems (project-based): Design, manufacture, installation, and commissioning of custom-engineered generator sets, emergency power systems and UPS systems. Revenue generated from large-scale project contracts for data centers, critical infrastructure, and industrial facilities.
2. Standard power generation products: Standard generator sets for private households, events, and commercial businesses sold directly.
3. After-sales service and maintenance: Ongoing after-sales service including professional maintenance, spare parts, fuel, modernizations, test runs and training. Manufacturer-independent service ensuring long-term system performance.

Go-to-market motion2 records

Distribution channels1 record

Marketing channels7 records

Core offering

Frerk Aggregatebau designs, manufactures, installs, and services custom-engineered low- and medium-voltage generator sets (Stromaggregate), emergency power systems (Netzersatzanlagen/NEA), and uninterruptible power supply (UPS/USV) systems. The company delivers turnkey, single-source solutions — from planning and in-house full-load testing to installation, commissioning, and after-sales service — for critical infrastructure, data centers, oil & gas, decentralized power supply, and commercial/private applications.

Product overview

Frerk Aggregatebau is a manufacturer of backup and emergency power solutions offering a unified portfolio of five integrated product lines: Stromaggregate (generator sets, emergency power systems, and UPS) as the core offering, paired with Installationsvarianten (custom installation solutions including mobile, container, building, and underground options). Systemintegration connects components from brand manufacturers into complete energy systems, while the Prüffeld provides in-house full-load testing on up to 19 test stands. After Sales Service delivers ongoing maintenance, repairs, and modernization. All products are designed and manufactured in Germany at the Schweringen facility, spanning from standard units to bespoke solutions for critical infrastructure, data centers, oil & gas, and decentralized power supply applications.

Differentiator

Problem solved

Functional benefit

Products and services

• Stromaggregate (Generator Sets) Tailored generator sets, emergency power systems (Netzersatzanlagen/NEA), and UPS systems in low and medium voltage configurations for diverse applications including critical infrastructure, data centers, oil & gas, and decentralized power supply.
• Installationsvarianten (Installation Variants) Flexible installation options for generator sets including mobile, container-based, building-integrated, and underground solutions designed to accommodate diverse project requirements and infrastructure environments.
• Systemintegration (System Integration) Integration services connecting motors, batteries, generators, and other components from brand-name manufacturers into cohesive energy systems with comprehensive system optimization for project-specific requirements.
• Prüffeld (Full-Load Test Field Service) Full-load testing of generator sets and emergency power systems according to ISO 8528 standards. Up to 19 test stands for quality assurance prior to delivery, with 8 state-of-the-art benches available in the new Hall 6 from Q3 2026.
• After Sales Service Comprehensive post-installation services including professional maintenance, high-quality original parts, repairs, modernization, test runs, training, and optional 24/7 emergency service. Manufacturer-independent service ensuring long-term system performance.

Quantifiable outcome

• Corporate Carbon Footprint reduced from 746.48 t CO₂e (2024) to 725.62 t CO₂e (2025)

Named customers2 records

Segments6 records

Ideal customer profiles6 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Four partnerships are on record, tiered core and minor.

• DEUTZ AGcoreOthers · 1 February 2026Frerk Aggregatebau GmbH was acquired by DEUTZ AG in February 2026, making it a wholly-owned subsidiary of the German engine manufacturer. DEUTZ reported the acquisition as part of its expansion in the energy solutions segment. This represents a significant ownership change, with DEUTZ gaining access to Frerk's emergency power and UPS systems capabilities.
• Max Bögl GroupminorImplementation/ SI/ Consulting PartnerMax Bögl Group served as the general contractor for the construction of the new production Hall 6 in Schweringen. Their professionalism and dedication were specifically acknowledged in the official handover announcement.
• AJS architectural firm Jürgen Schlake GmbHminorImplementation/ SI/ Consulting PartnerAJS architectural firm Jürgen Schlake GmbH was the architecture firm involved in the design and construction oversight of the new production Hall 6 project.
• Dr. Born - Dr. Ermel GmbHminorImplementation/ SI/ Consulting PartnerEngineering firm that collaborated with Frerk on the Wasserversorgungsverband Tecklenburger Land (WTL) water infrastructure project, providing planning services alongside Frerk's system delivery and installation.

Scale indicators6 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Himoinsa (Yanmar Energy System): Spanish manufacturer of generator sets and containerized power solutions serving data center, telecom and rental markets. Directly comparable mid-sized custom-generator manufacturer to Frerk.
• MAN Energy Solutions: German-based prime mover and power-generation specialist offering gensets, dual-fuel engines and complete power plants for marine, oil & gas and decentralized power supply — overlapping with Frerk's decentralized and oil & gas segments.
• Atlas Copco Power Technique: Manufactures mobile and containerized generator sets and energy storage systems for rental, construction and data center segments. Comparable to Frerk's container-based and modular offering for backup and distributed power.
• Kohler SDMO: French manufacturer of standard and bespoke gensets and UPS systems for industrial, commercial and IT applications. Directly competes with Frerk's Stromaggregate and UPS portfolio across European enterprise customers.
• Aksa Power Generation: Turkey-headquartered global manufacturer of standard and custom-engineered diesel generator sets for critical applications, data centers and oil & gas. Closest peer in scale and custom-engineering business model to Frerk.
• MTU Solutions (Rolls-Royce Power Systems): German-based manufacturer of gas/diesel generator sets, turnkey power plants and backup power solutions for critical infrastructure, data centers and oil & gas — directly overlaps Frerk's core product line and serves many of the same customers with mid-to-large-scale systems.
• Generac Industrial Power: Industrial division of Generac producing modular and custom-engineered generator systems (8 kW to 2 MW) for data centers, healthcare and critical infrastructure — overlaps Frerk's LV/MV backup genset business with similar project-based sale model.

Broad incumbents

• Wärtsilä Energy Storage & Solutions: Provides large-scale engine-based power plants, balancing power solutions and grid-scale energy storage. Overlaps with Frerk's Spitzenlast & Regelenergie peak-shaving and decentralized power segments, though at significantly larger scale.
• Caterpillar (Electric Power): Caterpillar's Electric Power division designs and manufactures diesel and gas generator sets for standby, prime and continuous power applications globally, including containerized solutions for data centers similar to Frerk's Hall 6 offering.
• Cummins Inc. Global power solutions leader manufacturing generator sets, transfer switches and paralleling systems for data centers, healthcare and commercial facilities. Much larger scale than Frerk but competes in the same LV/MV backup generator category Frerk serves.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

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Compliance13 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 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 Frerk Aggregatebau