Christian Breyer is Professor for Solar Economy at LUT University, Finland. His major expertise is the integrated research of technological and economic characteristics of renewable energy systems specializing in energy system modeling for 100% renewable energy, on a local but also global scale. His team published the most studies on 100% renewable energy for countries or major regions globally. Energy system transition studies are carried out in full hourly and high geo-spatial resolution. Publications cover integrated sector analyses with power, heat, transport, desalination, industry and negative CO2 emission options. Carbon capture and utilization as part of comprehensive Power-to-X investigations is a core research field for his team. He published more than 250 scientific papers, thereof more than 100 in scientific journals. He worked previously for Reiner Lemoine Institute, Berlin, and Q-Cells (now: Hanwha Q Cells). He is member of ETIP PV, IEA-PVPS, scientific committee of the EU PVSEC and IRES, scientific advisory board of CO2 Value Europe, chairman for renewable energy at the Energy Watch Group, reviewer for the IPCC and a co-founder of the Desertec Foundation. His academic background is general business, physics and energy systems engineering and a PhD in electrical engineering. He communicates in Twitter @ChristianOnRE.