1. Los precios industriales se disparan un 31, 9% en octubre, su mayor alza en 45 años
https://www.libremercado.com/2021-10-26/los-precios-industriales-se-disparan-un-236-en-septiembre-su-mayor-alza-en-44-anos-por-la-energia-6831010
2. Energy Policy Review Spain 2021,2021
3. Energy union
https://ec.europa.eu/energy/topics/energy-strategy/energy-union_en
4. National Strategy against Energy Poverty 2019–2024 in Spain
http://www.eppedia.eu/sites/default/files/2021-01/Barrella_2021_National%20Strategy%20against%20fuel%20poverty%20in%20Spain_EP-pedia.pdf
5. Renewable energy regulation and structural breaks: An empirical analysis of Spanish electricity price volatility