Els van der Roest is a researcher in the field of energy and water in the Industry, Wastewater and Reuse team. Her background is in chemistry and energy sciences, and she is interested in the intersection of energy and water, since these are the two themes that are becoming increasingly interdependent as society transitions to sustainable energy. Over the last few years, Els has worked on projects that revolve around the integration of electricity, heat, hydrogen and water in a single system for example, the Power-to-X and Power-to-X System Design projects. Together with Jos Boere and Ad van Wijk, she also coauthored the book Solar Power to the People (2017). In 2019, Els began (part-time) doctoral work in collaboratiion with TU Delft on integrated energy and water systems in urban environments. She takes a broad perspective and likes to act as a bridge between multiple disciples.