Open Power System Data - Frictionless data for electricity system modelling. - Frauke Wiese; Ingmar Schlecht; Wolf-Dieter Bunke; Clemens Gerbaulet; Lion Hirth; Martin Jahn; Friedrich Kunz; Casimir Lorenz; Jonathan Mühlenpfordt; Juliane Reimann; Wolf-Peter Schill (CoRR, 2018)