1. Ram M, Bogdanov D, Aghahosseini A, Gulagi A, Oyewo AS, Child M, et al. Global Energy System based on 100% Renewable Energy – Energy Transition in Europe Across Power, Heat, Transport and Desalination Sectors. Lappeenranta, Berlin: 2018.
2. Neslen A. Spain plans switch to 100% renewable electricity by 2050. Guard 2018. https://www.theguardian.com/environment/2018/nov/13/spain-plans-switch-100-renewable-electricity-2050 [accessed December 27, 2018].
3. Heinrich-Böll-Stiftung, Friends of the Earth Europ. ENERGY ATLAS - Facts and figures about renewables in Europe. Brussels: 2018.
4. REN21. Renewables 2017 Global Status Report. Paris: 2017.
5. BNEF. New Energy Outlook 2017. 2017.