1. Renewable energy in Europe: markets, trends, and technologies;European Renewable Energy Council,2010
2. Directive 2009/28/EC of the European parliament and of the council of 23 April 2009 on the promotion of the use of energy from renewable sources and amending and subsequently repealing Directives 2001/77/EC and 2003/30;European Commission;Off J Eur Union Belg,2009
3. United Nations. Framework convention on climate change. Fact sheet: the Kyoto protocol, 〈http://unfccc.int/files/press/backgrounders/application/pdf/fact_sheet_the_kyoto_protocol.pdf〉; 2011 [accessed 19.09.14].
4. National Grid. Data explorer, 〈http://www2.nationalgrid.com/uk/Industry-information/Electricity-transmission-operational-data/Data-Explorer/〉; 2014 [accessed 14.08.14].
5. British Hydropower Association. Hydropower: opportunities, challenges & sharing best practice. The British hydropower association perspective, 〈http://www.ciwem.org/media/142437/The%20British%20Hydropower%20Association%20Perspective.pdf〉; 2010 [accessed 18.09.14].