@article{HirthUeckerdtEdenhofer2017, author = {Lion Hirth and Falko Ueckerdt and Ottmar Edenhofer}, title = {Integration Costs Revisited - An economic framework for wind and solar variability}, journal = {Renewable Energy}, volume = {74}, pages = {925 -- 939}, doi = {10.1016/j.renene.2014.08.065}, year = {2017}, }