FEN Sustain Systems GmbH

FEN Sustain Systems GmbH (FEN Systems) is an Austrian service company based in Innsbruck that supports clients from politics, industry, commerce, and private households in the step-by-step transformation of energy systems toward climate neutrality and autonomy. Founded in 2014 by Nikolaus Fleischhacker and his father, the company operates from the Green Energy Center Europe at Technikerstraße 1-3 in Innsbruck, where it is part of the privately organized Codex Partnership. Its services span strategy development, project development and execution, product development, monitoring and quality assurance, dissemination of results, and training of skilled professionals. The company applies its own 'problem-solving methodology' for target convergence processes, aiming to keep ecological, economic, and social interests connected throughout the transformation. FEN Systems also supports the 'Klima- Energie- Ressourcenstrategie Tirol 2050 energieautonom' program and the derived hydrogen strategy program for building a green hydrogen economy in Central Europe. At the Green Energy Center Europe site, it operates a multimodal mobility hub. The company is closely linked to FEN Research GmbH, founded in 2018, which runs the E-West and HyWest research centers. CEO and founder Nikolaus Fleischhacker has led the company as managing director since 2025, after previously serving as technical director.

FEN Sustain Systems GmbH was founded in 2014 by Nikolaus Fleischhacker and his father. Nikolaus Fleischhacker, born in Innsbruck in 1988, studied civil engineering, environmental engineering, and domotronics at the University of Innsbruck, earning degrees including Bachelor of Science, Diplomingenieur, Master of Science, and Doctor of Technical Sciences. From 2012, he worked at the University of Innsbruck as a university assistant and later as a senior lecturer. In the company, he initially served as technical director and, since 2025, as managing director (CEO). The company is based at the Green Energy Center Europe in Innsbruck, which Fleischhacker co-founded and where the privately organized Codex Partnership of industry players and startups has been located since 2016. From this environment, the research centers E-West and HyWest emerged, led by Fleischhacker as CEO of FEN Research GmbH, founded in 2018. FEN Systems supports the target convergence program for the 'Klima- Energie- Ressourcenstrategie Tirol 2050 energieautonom' and the derived hydrogen strategy program for building a green hydrogen economy in Central Europe. It also operates a multimodal mobility hub at the Green Energy Center Europe site. Since 2021, Fleischhacker has served as an official expert for Austria in the European Green Hydrogen Agenda.

• 2025

  Nikolaus Fleischhacker becomes managing director (CEO) of FEN Systems.

• 2021

  Nikolaus Fleischhacker becomes official expert for Austria in the European Green Hydrogen Agenda.

• 2018

  FEN Research GmbH founded, leading to E-West and HyWest research centers.

• 2016

  Codex Partnership of industry players and startups established at Green Energy Center Europe.

• 2014

  FEN Sustain Systems GmbH founded by Nikolaus Fleischhacker and his father.

Guides clients through sustainable and step-by-step energy system transformation, emphasizing appreciation, securing, and use of own resources.

• Zielkonvergenz-Prozessbegleitung

  Process support for target convergence in energy system transformation.

• Multimodaler Mobilitätsknoten

  A multimodal mobility hub operated at the Green Energy Center Europe site.

1. 1Homefen-systems.com
2. 2Über unsfen-systems.com
3. 3FEN Sustain Systems GmbHwikidata.org