We find out what happened when Sweden introduced electricity in early 20th century. Kerstin Enflo is an Associate Professor in the Department of Economic History at Lund University. Her research focus on long-run regional and industrial growth as well as local labor markets. She has conducted analysis to assess the role of natural resources, the extent of the market, agglomeration economies, technical change and regional convergence. She is specifically interested in the role of historical place-based policies, such as infrastructure investments. She is also interested in the long-term evolution of regional inequality and has constructed regional GDPs per capita that go back to the 16th century.