The Energy Systems track of the Skoltech Engineering Systems doctoral program covers a rich variety of research topics pertaining to smart grids, power electronics, power systems control and optimization, energy markets, and energy conversion physics and technology. Research activities are varied and may focus on one particular subfield or combine two or more of them; they may concentrate on experimental studies, development of mathematical and numerical methods, as well as modeling and simulation of actual energy systems, possibly coupling electric/heat/gas infrastructures. Our research activities extend beyond the academic domain as the field of Energy Systems is of high relevance to industry and markets. As energy is a source of key questions whose complexity scales with the great economic, industrial, societal, and environmental challenges we now must face, we guide and encourage our PhD students to gain expert knowledge in their chosen field, contribute through original research to the corpus of scientific and technical knowledge, and develop a strong awareness of the needs in industry and the wider society to prepare a sustainable future. Doctoral studies at Skoltech typically are four years of full-time. In addition to sharp technical competences, our students develop transferable professional skills that are much sought by employers worldwide; these skills include complex problem formulation and solving, team working in different environments, reporting, oral and written communication in English to name a few.