1. EESI: Fossil Fuels | EESI. https://www.eesi.org/topics/fossil-fuels/description. Accessed 24 May 2022
2. IEA: Renewables – Fuels & Technologies. https://www.iea.org/fuels-and-technologies/renewables. Accessed 24 May 2022
3. IEA-ETSAP, IRENA: Renewable Energy Integration in Power Grids (2015)
4. Barbière, C.: 700 cities promise renewable energy transition by 2050. https://www.euractiv.com/section/climate-environment/news/700-cities-promise-renewable-energy-transition-by-2050/. Accessed 24 May 2022
5. Thellufsen, J.Z., et al.: Smart energy cities in a 100% renewable energy context. Renew. Sustain. Energy Rev. 129, 109922 (2020). https://doi.org/10.1016/j.rser.2020.109922