1. https://www.eea.europa.eu/ims/share-of-energy-consumption-from
2. https://ec.europa.eu/eurostat/statistics-explained/index.php?title=Renewable_energy_statistics#Wind_and_water_provide_most_renewable_electricity.3B_solar_is_the_fastest-growing_energy_source , last opened 19-04-22
3. https://edition.cnn.com/2021/01/24/business/eu-renewable-energy-fossil-fuels/index.html , last opened 04/04/2022
4. https://ec.europa.eu/info/horizon-europe/@09-04-2021
5. Tabulated values of the Shockley–Queisser limit for single junction solar cells