Covering online news on the German market and editing the German print issue since 2021, Marian has been writing about power electronics for pv magazine’s global website and monthly print magazine since 2018.

Garikoitz Sarriegi Etxeberria is a Project Engineer at Kiwa PI Berlin, specialising in power electronics and energy-storage-related systems. With a PhD in Power Electronics from RWTH Aachen University, he brings over a decade of experience translating advanced R&D into deployable solutions for battery systems, converters, and grid-connected applications.

His work sits where theory meets bankable reality, supporting the design, optimisation, and reliability of technologies that underpin modern BESS projects. At the BESS Business & Development Forum, Garikoitz shares an engineering-driven perspective on how robust power electronics and system design directly influence performance, risk, and long-term project value.

Garikoitz Sarriegi Etxeberria is a Project Engineer at Kiwa PI Berlin, specialising in power electronics and energy-storage-related systems. With a PhD in Power Electronics from RWTH Aachen University, he brings over a decade of experience translating advanced R&D into deployable solutions for battery systems, converters, and grid-connected applications.

His work sits where theory meets bankable reality, supporting the design, optimisation, and reliability of technologies that underpin modern BESS projects. At the BESS Business & Development Forum, Garikoitz shares an engineering-driven perspective on how robust power electronics and system design directly influence performance, risk, and long-term project value.

Tim Koenemann leitet das Center of Competence Green Infrastructure Finance der Commerzbank AG. Er hat in seiner Funktion weltweite Verantwortung für Unternehmens- und Projektfinanzierungen im Bereich erneuerbarer Energien und anderer grüner Infrastruktur mit einem Portfolio von ca. 15 Mrd. EUR. Tim ist seit 2011 in verschiedenen (leitenden) Rollen im Kompetenzzentrum tätig. Vor seinem Eintritt in die Bank war er 6 Jahre als Strategieberater für Accenture und Roland Berger Strategy Consultants im Energiesektor tätig.

Tim Koenemann is heading Commerzbank‘s Center of Competence Green Infrastructure Finance. In his current role he has global responsibility for all corporate and project finance activities in the sector renewable energies and other green infrastructure with a portfolio of EUR 15 bn.
Tim is with the bank since 2011 and has worked in various (managerial) roles within the Center of Competence. Before his time with the bank, he has been working for 6 years as a strategy consultant in the energy sector with Accenture and Roland Berger Strategy Consultants.

Dr. Stephan Rohr is Co-CEO and Co-founder of TWAICE, a pioneer in battery analytics helping asset managers and operators scale BESS fleets safely, reliably, and predictably. He earned his Ph.D. from the Technical University of Munich, dedicating more than six years to researching Li-ion cell degradation and the economic impacts of lifecycle performance, work that inspired him to bridge battery science and real-world applications. Founded in 2018, TWAICE turns deep battery science and machine learning into operational solutions, including SOH estimation, operational life modeling, and predictive maintenance strategies to maximize BESS ROI.

Ben Callam is Chief Product Officer at PVFARM, the decision platform for utility-scale solar and battery design. He brings deep experience in solar construction and EPC delivery, including engineering, estimating, procurement, logistics, civil and structural coordination, and the handoffs that determine whether a design can be built efficiently. That background shapes how he leads product strategy: connecting real project constraints with the workflows, data, and decisions that matter most to engineers and project teams. His current work spans PVFARM’s core design platform, civil optimization, quantity continuity, BESS design tooling, RE PILOT, and the feedback loops between design, procurement, construction, and handover. His perspective is shaped by close work with EPCs, engineering consultants, and battery/storage teams across the US and European markets.

Dr. Stefano Alberici is the VP of Technology for EMEA at HyperStrong International. Holding a Ph.D. in Nuclear Engineering, he transitioned to renewables in 2005, specializing in PV physics, inverter technology, and energy storage. Based in Bologna, he will present HyperStrong’s integrated engineering approach to solving critical bottlenecks in the European utility and C&I energy storage markets.

Ben Callam is Chief Product Officer at PVFARM, the decision platform for utility-scale solar and battery design. He brings deep experience in solar construction and EPC delivery, including engineering, estimating, procurement, logistics, civil and structural coordination, and the handoffs that determine whether a design can be built efficiently. That background shapes how he leads product strategy: connecting real project constraints with the workflows, data, and decisions that matter most to engineers and project teams. His current work spans PVFARM’s core design platform, civil optimization, quantity continuity, BESS design tooling, RE PILOT, and the feedback loops between design, procurement, construction, and handover. His perspective is shaped by close work with EPCs, engineering consultants, and battery/storage teams across the US and European markets.

Michael heads the pv magazine editorial department. He’s been writing about solar since 2008, and helped build the German platform under his role as editor in chief. Previously, he worked for radio, television and national newspaper titles, and completed a doctorate in physics.

Martin Stötzel ist Diplom-Wirtschaftsingenieur (KIT Karlsruhe) und promovierter Innovationsmanager (FAU Erlangen-Nürnberg). Mit über 20 Jahren Erfahrung im Top-Management-Consulting sowie in leitenden Positionen an der Schnittstelle von Technologie, Produktmanagement und Energiewirtschaft bringt er ein breites strategisches und operatives Fundament mit. Seine Karriere führte ihn u. a. zu Vodafone sowie zu SMA/coneva, wo er tiefes Branchen-Know-how in der Energiewirtschaft aufbaute. Heute ist er Co-Founder und Geschäftsführer von SPiNE, einem Technologieunternehmen für intelligente Messsysteme im deutschen Energiemarkt, und verantwortet dort als CPO die Bereiche Produkt und Marketing. Mit SPiNE treibt er die Digitalisierung der Energiewende voran – von der Softwareplattform für Messstellenbetreiber bis zum App Store für Energiemanagement-Anwendungen.

Cornelia Lichner has been writing for pv magazine since 2008 and regularly reports on a wide range of topics with a focus on innovative concepts for the coupling of solar power with other sectors. She also organizes webinars and publishes podcasts.

Michael heads the pv magazine editorial department. He’s been writing about solar since 2008, and helped build the German platform under his role as editor in chief. Previously, he worked for radio, television and national newspaper titles, and completed a doctorate in physics.

Moritz joined SpotmyEnergy as its first employee in 2023 and has helped build the company alongside founder Jochen and the growing team ever since. Prior to SpotmyEnergy, he gained experience in energy trading and the broader energy sector, including roles at Impuls Energy Trading. Today, he is focused on developing smart energy solutions for single-family homes that help customers reduce their electricity costs while increasing comfort and automation. His work centers on combining virtual power plants, dynamic electricity tariffs, smart meters, and connected energy assets into a seamless customer experience that unlocks the full value of the energy transition.

As a Solar Technology & Storage Officer at the German Solar Association, Thomas Seltmann has been working since March 2022 on the further development of technical regulations and political framework conditions for photovoltaics in Germany. Prior to that, he was a photovoltaics and prosumer consultant at the North Rhine-Westphalia Consumer Advice Centre (Verbraucherzentrale NRW) and worked in various roles in the solar industry for around thirty years. He is a lecturer, author and writes advice articles on photovoltaics tax issues for the trade journal PV-Magazine Germany.

Michael heads the pv magazine editorial department. He’s been writing about solar since 2008, and helped build the German platform under his role as editor in chief. Previously, he worked for radio, television and national newspaper titles, and completed a doctorate in physics.

Grown up in Kiel at the sea, industrial engineer by training, startup fan already as a student (working student at UnternehmerTUM in Munich), in that job I first touched the energy world and got hooked. Worked as an energy trader myself afterwards trading power and gas before founding Otter Energy Trading with my co-founders Roman and Marek.