Lennart Söder, born 1956, is professor in Electric Power Systems at KTH since 1999. He is engaged in research and education in the field of Electric Power Systems. This includes studies of power system stability, transfer opportunities, electricity price formation, smart grid, the impact of wind and solar energy, regulation of hydro power, the effect of economic regulation, studies of electric vehicles etc. Lennart Söder has participated in several national studies and he was the government's sole investigator for the Grid Inquiry. He is active in several international collaborative projects in Sweden, Nordic area, the EU and the IEA.
Lennart Söder has, up to 2021, been the main supervisor of 37 PhD students up to licentiate and/or PhD exam. They have been in different areas such as wind power interation, transmission expansion, harmonics, power quality, dynamics, distribution, hydro power, reliability, electric railways, electric vehicles, economic regulation, restoration etc.