About Büro F

Büro F is a Berliner market researcher specializing in renewable energies and power markets. We analyze the market potentialities of new technologies and further develop attractive business models. Following this, we support our clients with market access by arranging contacts as well as by means of direct communication in specialized media. Our customers include component manufacturers, energy providers and state institutions in the areas of energy economy and international cooperation.


Büro F stands for the chances of the distributed energy world

Photovoltaics, wind power, bioenergy & Co. are no longer niche products – they have reached mass market maturity. In more and more countries, renewables are achieving network and production parity. We are following these developments via country market studies and comparative analyses.

In the next phase of the energy transition, bringing together fluctuating production with consumption will take priority. The solutions are at hand in the form of battery storage units and increasingly digital networking. And on the leading international markets, business models are developing which providers will be able to profit from on the power market. Whether it be private consumption, direct electricity models or new financing methods - we follow and shape the latest developments on the new markets for decentralized energy provision.


We work as a network of energy experts

Büro F has a broad network of experts in the renewable energy industry. This allows Büro F to cover a broad range of topics. Our office partnership in Berlin-Mitte is the nucleus of our consultant network:

Stephan Franz is the founder and owner of Büro F. He has been working as a consultant in the field of renewable energies since 2007. He received his M.A. in political science and economics from the University of Potsdam. Most recently, he worked as a consultant for Gesellschaft für Internationale Zusammenarbeit (GIZ) at the Chilean Ministry of Energy. Prior to that, Stephan worked in the market research department and the strategy department of the PV company Q CELLS. As a consultant at the German Energy Agency (dena), Stephan analyzed foreign markets for German companies. He also conducted market analyses of new technologies for the market research company EuPD Research. Before that, he organized conferences and delegation programs for the Friedrich-Ebert-Foundation. Stephan is fluent in German, English and Spanish. He lives in Berlin.


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.


Ulrich Kaltenbach, owner of Kaltenbach Energy Consulting,  is cooperation and office partner of Büro F. He has been working in the renewable energy sector for several years. Ulrich received his degree in economics and International Cultural and Business Studies at University Passau. Most recently, he worked as a consultant for Gesellschaft für Internationale Zusammenarbeit (GIZ) in El Salvador. He supported the introduction of renewable energies in Central America. Prior to that, he worked for five years with the top-four German utility EnBW. At EnBW, Ulrich was responsible for the development of photovoltaic projects in the megawatt range. As a consultant for the German Latin America Association (LAV), Ulrich started the working line renewable energies. He is fluent in German, English and Spanish. Ulrich lives and works in Berlin.


Alexander Gerlach, owner of Gerlach Consulting, is a cooperation partner of Büro F. For the last 7 years, he has been active in the renewable energy sector. In his most recent position he was working as an expert specialist at the photovoltaics manufacturer Hanwha Q CELLS in charge of the Global Market Intelligence – first in marketing and later for the Corporate Strategy Department. Since 2009 he has been publishing scientific papers on conferences and in peer reviewed journals. During the last 4 years, he also has been contributing market data and forecasts to the International Technology Roadmap PV (ITR PV). Alexander studied Engineering Management with a focus on production and processes at the Clausthal University of Technology. He speaks fluent English and German.  

Stephan Franz stephan.franz@burof.de +49-(0)30-208986601

Stephan Franz


Fabian Zuber  

Fabian Zuber


Ulrich Kaltenbach  

Ulrich Kaltenbach


Alexander Gerlach

Alexander Gerlach