Stefan (Ing., Msc) Niederhofer-Managing Director
Check rate
Experience
Managing Director
Unisource GmbH
- Project management for commercial and industrial BESS, rooftop PV and hydrogen systems (up to 20 MW) in the DACH region
- AC- and DC-Engineering (low-, medium- and high voltage)
- Management of all project phases: technical assessment, concept and implementation planning, creation and review of service specifications, coordination of planning participants, schedule and budget control
- Coordination with grid operators (NVPs, VDE-AR-N 4105/4110/4120, TABs, EAAV) and authorities
- Overarching interface management between customers, suppliers, and subcontractors
- Ensuring quality, professional due diligence, adherence to deadlines, and cost efficiency
PhD Candidate
Austrian Institute of Technology & Technische Universität Wien
- Development and evaluation of integrated energy systems with PV plants and electrolysis for industrial consumption profiles
- Analysis of load and generation profiles, modeling grid connection options and control concepts
- In-depth knowledge of system integration, grid compatibility and optimization of renewable energy systems
Project Manager
Self-employed
- Leading and coordinating complex PV projects from preliminary planning to commissioning
- Creating and reviewing technical concepts (grid connection, protection technology, string planning, single line diagrams)
- Tendering and procurement management including scope of work and technical specifications
- Project controlling and quality assurance in collaboration with contractors
- Utilizing an established regional network of specialist planners, suppliers and subcontractors
Founder and Managing Director
GF Sustainable Engineering and Consulting GmbH
- Management consulting with a focus on renewable energy
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Energy and Professional Services.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Project Management, Procurement, Quality Assurance, Strategy, Sustainability Management, and Research and Development.
Summary
Renewable energy project manager with ~9 years of experience in grid connection, AC engineering and project delivery of PV and battery energy storage systems (BESS) up to medium MW scale. Experienced in grid connection processes with DSOs including grid capacity assessment, connection point evaluation and evaluation of grid connection costs including Baukostenzuschuss (BKZ) in accordance with German grid codes (VDE-AR-N 4105 / 4110 / 4120).
Strong background in AC and DC electrical design, technical due diligence and preparation of construction-ready project documentation. Experienced in coordinating grid operators, planning offices, suppliers and subcontractors while ensuring grid compliance, project timelines and cost efficiency.
Experience gained through multiple grid connection projects in Germany including Unna, Wolpertshausen and Saarwellingen.
Skills
Technical Profile
- Grid Connection & Integration: Planning And Evaluation Of Grid Connection Concepts For Industrial Pv Systems And Energy Storage In Low, Medium And High Voltage Networks. Experience Coordinating With Grid Operators And Evaluating Connection Points, Grid Capacity And Technical Connection Requirements (Tab).
- Grid Compliance & Standards: Implementing And Verifying Grid Connection Requirements According To Vde-Ar-N 4105 / 4110 / 4120, Including Protection Concepts, Active Power Management, Feed-In Management, Single Line Diagram Creation And Technical Coordination With Grid Operators.
- Construction Cost Subsidy & Connection Costs: Supporting The Assessment And Validation Of Construction Cost Subsidy (Bkz) Costs And Analyzing The Economic Impact Of Different Connection Points In Project Planning And Development.
- Technical Due Diligence & Project Assessment: Analyzing Technical Grid Connection Concepts, Supporting Profitability Analyses And Evaluating Grid Connection Risks And Project Milestones.
- Grid Operators & Industry Contacts: Extensive Project Experience Working With Grid Operators Such As Bayernwerk Netz Gmbh, Stadtwerke MüNchen (Swm), Mitnetz, Lew, And Many Other Local And Regional Grid Operators.
It Expertise
- Microsoft Office Including Ms Visio
- Pv*Sol
- Solar.Pro.Tool
- Pvgis
- Python
- Power Factory
- Visual Basic
- Matlab
Languages
Education
Vienna University of Technology
Dr. techn. · Energy Engineering · Vienna, Austria
University of Applied Sciences Technikum Vienna
Master of Science in Engineering · Renewable Urban Energy Systems · Vienna, Austria
University of Applied Sciences Kufstein
Bachelor of Arts in Business · European Energy Management · Kufstein, Austria
Certifications & licenses
Electrical Safety Regulations, WIFI Austria qualification for operating an electrical engineering business
WIFI Austria
Statistics
Experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Stefan is based in Polling, Germany.
Stefan speaks the following languages: German (Native), English (Advanced), French (Elementary), Chinese (Elementary).
Stefan has at least 12 years of experience. During this time, Stefan has worked in at least 4 different roles and for 4 different companies. The average length of individual experience is 3 years and 1 month. Note that Stefan may not have shared all experience and actually has more experience.
Based on recent experience, Stefan would be well-suited for roles such as: Managing Director, PhD Candidate, Project Manager.
Stefan's most recent position is Managing Director at Unisource GmbH.
In recent years, Stefan has worked for Unisource GmbH, Austrian Institute of Technology & Technische Universität Wien, and Self-employed.
Stefan is most experienced in industries like Energy and Professional Services.
Stefan is most experienced in business areas like Project Management, Procurement, and Quality Assurance. Stefan also has some experience in Strategy, Sustainability Management, and Research and Development.
Stefan has recently worked in industries like Energy.
Stefan has recently worked in business areas like Project Management, Procurement, and Quality Assurance.
Stefan holds a Doctorate in Energy Engineering from Vienna University of Technology, a Master in Renewable Urban Energy Systems from University of Applied Sciences Technikum Vienna and a Bachelor in European Energy Management from University of Applied Sciences Kufstein.
Stefan has 1 certificate: Electrical Safety Regulations, WIFI Austria qualification for operating an electrical engineering business.
The availability of Stefan needs to be confirmed.
Daily rate distribution
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Average rates for similar positions
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The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 6 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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