In the "System Concepts" working group, various energy technology and process engineering systems are developed on a customer-specific basis, from the model to the real system, which is in part ready for series production. Extensive experience and successfully established concepts exist in particular for energy systems for off-grid, decentralized power supply with high-temperature fuel cell systems based on SOFC (e.g. eneramic®). Within this framework, we have realized numerous development projects with international industrial customers over the past ten years. We are also involved in module development and system integration of stationary energy storage systems based on high-temperature batteries (cerenergy® cells) – a battery technology based on sodium/nickel chloride solid electrolytes (Na/NiCl2), also known as ZEBRA batteries.