The Chemical Energy Storage working group is dedicated to researching new strategies for the improved use and integration of renewable energies. In the "Sustainable Energy Systems" research field, the focus is on discontinuous electricity storage using electrolysis and the subsequent catalytic conversion of green hydrogen into methane, methanol, synthetic fuels and ammonia. These processes, also known as Power-to-X processes, play a decisive role in the implementation of a future "circular economy". So far, however, little is known about the operating behavior of Power-to-X plants under dynamic conditions (load changes, start-up and shut-down) and about the plant and reactor design required for this. The Chemical Energy Storage working group is intensively investigating these aspects and is focusing on the development of innovative reactor concepts and suitable operating strategies. Innovative approaches from the fields of digitalization, modelling and optimization are used, which are underpinned by novel experimental facilities.