1. ENTSO-E, Electricity in Europe 2015, Synthetic Overview of Electric System Consumption, Generation and Exchanges in the ENTSO-E Areahttps://www.entsoe.eu/Documents/Publications/Statistics/electricity_in_europe/entsoe_electricity_in_europe_2015_web.pdf
2. ENTSO-E, Scenario Outlook & Adequacy Forecast 2015https://www.entsoe.eu/Documents/SDC%20documents/SOAF/150630_SOAF_2015_publication_wcover.pdf
3. Enclosure to the Grid Code A.15–Participation in the Regulation of Frequency and Frequency/Powerhttp://download.terna.it/terna/0000/0105/32.pdf