What R.E.S. GmbH does

R.E.S. GmbH (Renewable Energy Service) is a privately held, owner-managed German engineering services company founded in 2008 by Robert Hüsken and headquartered in Hoogstede, Lower Saxony. The firm delivers control, repair, maintenance, commissioning, prototype support, and upgrade services for complex onshore and offshore wind turbines, with a stated focus on maximizing turbine availability, productivity, and efficiency for its customers. Its service portfolio includes OEM partnership-based support, full-scope commissioning with quality management, prototype documentation and testing, large component replacement, offshore wind farm services, and a proprietary wind vector-dependent control retrofit system that allows configurable production rules by wind angle, speed, and hysteresis.

The company sells exclusively on a project-based, custom-quoted professional services model to enterprise customers in the wind energy value chain, specifically OEMs (e.g., E.ON Climate & Renewables, Senvion, kenersys, 2-B Energy, SSB Wind Systems), wind park operators and owners (e.g., Clean Energy Factory, Windforce, amrumbank.west, Juwi), and wind project developers. Delivery is conducted via mobile service vehicles equipped with 36kV measurement equipment, hydraulic tools, and tensioning cylinders, dispatched from operational hubs in Germany (Hoogstede headquarters), India (South Asia coordination), and Japan (Hokkaido, Honshū, Kyūshū), with active project work documented in Germany, France, Poland, Spain, Sweden, Netherlands, Sri Lanka, Japan, India, and the USA. Go-to-market is direct enterprise field sales supplemented by referrals, BWE and BDSH industry association memberships, and a relationship-based partnership approach.

The business model is operationally lean: 1–10 employees, no external institutional investors, and management concentrated in the Hüsken family (Robert Hüsken as owner and Managing Director; Michael Hüsken as Managing Director). Revenue is generated entirely from professional service engagements without disclosed pricing, recurring SaaS, or platform economics, making the firm entirely dependent on the wind energy capex and O&M cycle of its OEM and operator customers.

Name

R.E.S. GmbH

Legal name

RES-GmbH / Renewable Energy Service

Website

https://res-gmbh.com

Company type

Private

Founded year

2008

Operating status

Operating

Headcount range

1–10 employees

Short description

R.E.S. GmbH is an owner-managed German engineering services firm providing control, repair, maintenance, commissioning, and upgrade services for onshore and offshore wind turbines, delivered globally via mobile service teams to wind turbine OEMs, wind park operators, and project developers.

Ownership category

akta.pro rank

Product category

Wind Energy Services

NAICS

Electronic and Precision Equipment Repair and Maintenance (811210)

SIC

Engines & Turbines (3510)

akta.pro primary industry

Wind Operations, Maintenance & Asset Management (Scheduled/Unscheduled) (EUAMACAH)

akta.pro secondary industries

Wind Component Service, Repair & Refurbishment (Blades, Gearboxes, Bearings) (EUAMACAI), Wind Turbine Installation & Commissioning (Cranes, Vessels, Jack-ups) (EUAMACAG), Wind Farm EPC & Balance of Plant Construction (Civil, Electrical, Substations) (EUAMACAF)

Keywords

• Wind turbine maintenance
• Wind energy services
• Offshore wind services
• Wind turbine commissioning
• Wind park operations

Headquarters

HQ city

Hoogstede

HQ country

Germany

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales

Revenue model

1. Maintenance and Repair Services: Ongoing maintenance, troubleshooting, and repair services for wind energy systems. Services include full maintenance, repairs, and retrofit installations. Revenue generated through service contracts and project-based work.
2. Commissioning Services: Complete planning and execution of wind turbine commissioning, including quality management and optimization of workflows. Includes prototype commissioning support.
3. Upgrade and Retrofit Installations: Installation of upgrades including wind vector-dependent control systems, with minimal retrofit effort. Project-based revenue for custom upgrade solutions.
4. Project Work and Prototyping: Individual service solutions and project work ranging from upgrade development to complete installation and commissioning, large component replacement, offshore activities, and prototype commissioning.
5. Training and Qualification Services: Employee qualification and training programs including preparation for external examinations (Industry Electrician). Technical professional training in the wind industry.

Go-to-market motion2 records

Distribution channels1 record

Marketing channels5 records

Core offering

R.E.S. GmbH provides specialized on-site services for complex onshore and offshore wind energy turbines, including control, repair, maintenance, commissioning, prototype support, and retrofit upgrade installations. Services are delivered worldwide by mobile technicians equipped with specialized tools (36kV measurement, hydraulic, tensioning cylinders) traveling directly to customer wind farms and OEM facilities. The company also trains customer employees for technical qualifications in the wind industry.

Product overview

R.E.S. GmbH (Renewable Energy Service) is a service-oriented company offering a unified portfolio of wind energy services rather than a software product platform. The core offerings encompass OEM Services (flexible project collaboration with manufacturers), Inbetriebnahmen (commissioning), Prototypenbetreuung (prototype support and documentation), Upgrades (wind vector-dependent control retrofits), and Wartung & Instandhaltung (maintenance and repair). The company also provides Offshore Services for offshore wind installations. These services are delivered through a network of locations in Germany (headquarters in Hoogstede), India, and Japan, with global project delivery capabilities spanning Europe, Asia, and North America.

Differentiator

Problem solved

Functional benefit

Products and services

• OEM Services Partnership-based collaboration with wind turbine Original Equipment Manufacturers (OEMs) providing flexible project implementation ranging from onshore maintenance to offshore repairs and upgrade installations. Delivered by technicians using 36kV measurement equipment, hydraulic tools, and tensioning cylinders for on-site work at OEM and wind farm sites.
• Commissioning (Inbetriebnahmen) Complete planning and efficient implementation of wind turbine commissioning with holistic quality management and optimized workflows, designed to ensure wind turbines connect to the grid efficiently and error-free. Engineers and technicians draw on experience from numerous prior projects.
• Prototype Support (Prototypenbetreuung) Comprehensive support for wind turbine prototype development including documentation of important test data, regular controls, analysis, optimization reports, and ongoing exchange with development teams to enable efficient prototype optimization.
• Upgrades (Wind Vector-Dependent Control Retrofit) Retrofit solution enabling wind turbines to be equipped with wind vector-dependent control systems, allowing production rules to be applied when wind flows from configurable wind vector (angle) or multiple vectors, with options for wind speed and hysteresis configuration. Installed with minimal retrofit effort.
• Maintenance and Repair (Wartung & Instandhaltung) Comprehensive maintenance and repair services for complex wind turbines, including troubleshooting, process optimization, and employee training, delivered by fully equipped service vehicles for on-site technical intervention at wind farms.
• Offshore Services Offshore wind energy services including installation support, commissioning, quality control, and project development for offshore wind farms, including support in developing service concepts and implementing upgrades and retrofit measures at offshore installations such as Global Tech I and Borkum West II.

Named customers9 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

Feature4 records

Partnerships

Two partnerships are on record, tiered minor.

• Bundesverband Windenergie (BWE)minorOthersIndustry association membership providing visibility and networking within the German wind energy sector. The Bundesverband Windenergie is the main industry association for wind energy in Germany.
• Bundesverband deutscher sachverständiger (BDSH)minorOthersIndustry association membership for expert appraisers and consultants in Germany. Provides professional networking and industry credibility for the company's technical expertise.

Scale indicators3 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• Nordex Service: German-headquartered wind turbine OEM with significant in-house service operations across Europe and the Americas. Directly comparable as a competitor for European wind O&M contracts and a frequent OEM customer for independent service firms.
• Vestas Service: World's largest wind turbine OEM with a global service organization offering maintenance, upgrades and lifetime extension. Competes with RES for aftermarket share and uses its scale to lock in multi-year service agreements with operators.
• Stork (Fluor): Industrial services provider (part of Fluor) with wind turbine maintenance and component exchange capabilities across Europe. Comparable as a competitor for large-component replacement and on-site technical services on utility-scale wind farms.
• GE Renewable Energy: Global wind OEM (including legacy GE1.5/GE2.5 MW fleets RES has serviced via Clean Energy Factory in Japan). Competes for service contracts on legacy GE fleets and sets standards for major component replacement work.
• Siemens Gamesa Renewable Energy: Major global wind OEM with onshore and offshore service operations, including offshore installation and maintenance comparable to RES's offshore portfolio. Sets pricing and capacity benchmarks for independent service providers.
• ENERCON Service: One of Germany's largest wind turbine OEMs with extensive in-house service operations worldwide. Comparable as a competitor for O&M, commissioning and retrofit work, particularly on ENERCON turbines across Europe.
• Mott MacDonald (Renewables): Global engineering consultancy providing owner's engineer, O&M advisory and technical due diligence services across wind and other renewables. Comparable as a competing provider of high-end technical services and asset management to wind operators.
• DNV (Renewables Advisory): Independent energy expert offering testing, inspection, certification and O&M advisory across wind projects globally. Competes for technical advisory and project certification work that overlaps with RES's prototype support and commissioning services.

Direct peers

• wpd windmanager: Independent wind farm operator and technical service provider managing several GW of wind capacity in Europe and Asia. Comparable as a competitor for operations management, technical due diligence and O&M services to wind park operators.
• Deutsche Windtechnik: Germany-based independent wind turbine service provider offering maintenance, repair, retrofit and 24/7 operations across multiple OEM platforms. Most direct comparability to RES given shared German base, full-scope O&M model and multi-OEM service capability.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/res-gmbh-renewable-energy-service

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 R.E.S. GmbH