Held, A., Ragwitz, M., Sensfuß, F., Resch, G., Olmos, L., Ramos, A., & Rivier, M. (2018). How can the renewables targets be reached cost-effectively? Policy options for the development of renewables and the transmission grid. Energy Policy, 116, 112–126. https://doi.org/10.1016/j.enpol.2018.01.025