Büro F is a Berliner market analyst specializing in renewable energies

We analyze the latest developments in the energy industry and identify attractive business models.
We elaborate policy recommendations and arrange contacts to movers of the energy transition.
A special focus of our work is on the exchange between Latin America and Europe.

Büro F is involved in various committees and forums for the decentralized and democratic energy transition. We are committed to open societies and intercultural exchange.

We work as a network of energy experts

Büro F brings together a network of independent renewable energy experts. The core of our network is the office partnership on Marienstraße 25 in Berlin Mitte:


Stephan Franz (MBA) is the founder and owner of Büro F. He has been carrying out market analyses in the field of renewable energies and smart energy systems for more than ten years. He’s worked with Büro F as a freelance consultant in Berlin since 2014. Prior to founding Büro F, Stephan worked as a consultant to the GIZ in the Chilean Ministry of Energy. In the strategy department of the photovoltaic manufacturer Q CELLS he previously supported the development of new business models for the self-consumption of solar power. Other professional positions include working as a consultant at the German Energy Agency (dena) and as an analyst with the market researcher EuPD Research. Stephan studied Political Science and Economics at the University of Potsdam. In 2017 he also completed the MBA "Energy Management" at TU Berlin. Stephan is fluent in German, English and Spanish.


Fabian Zuber, owner of the consultancy l'energie - Lokale Energie, is a cooperation and office partner of Büro F. He has been working in the field of renewable energies for more than ten years. Recently, in the capacity of director he has managed the design and establishment of the alliance Bürgerenergie and has advocated the strengthening of decentralized power provision there. As public affairs manager at the company First Solar, he was responsible for public relations and the codesigning of political framework conditions in Germany and other European markets. He has written studies on international energy markets for the German Society for International Cooperation (GIZ) and the German Energy Agency (dena). Fabian Zuber studied languages, economy and cultural studies at the University of Passau. He speaks fluent German, English, Spanish, French and Portuguese.


Mirco Sieg, owner of micropowr energy consulting, is a cooperation partner of Büro F and has been active in the renewable energy sector for more than seven years. As a freelance consultant and author in Düsseldorf, he is currently focusing on knowledge and technology transfer between Germany and South America. One of his focuses lies on the technical, economic and political challenges of using smart microgrids. Previously, he worked for several years as an editor for the photovoltaic journals "pv magazine" and "photovoltaik" of the pv magazine group GmbH and Solarpraxis AG in Berlin. As an employee at the Embassy of the Republic of Chile in Berlin, he supported scientific exchange between Germany and the Andean state, including in the area of renewable energies. Mirco holds a diploma in landscape ecology and is fluent in German, English and Spanish.


Stephan Franz



Fabian Zuber


Mirco Sieg