1. DENA: ‘Energiewirtschaftliche Planung für die Netzintegration von Windenergie in Deutschland an Land und Offshore bis zum Jahr 2020’. A report of Energiewirtschaftliches Institut, Cologne (EWI) in association with E.ON Netz, RWE Transportnetz Strom, VE Transmission, DEWI commissioned by Deutschen Energie Agentur (DENA), February 2005
2. Gross, R., Heptonstall, P., Anderson, D., Green, T., Leach, M., and Skea, J.: ‘The costs and impacts of intermittency: an assessment of the evidence on the costs and impacts of intermittent generation on the British electricity network’, (Imperial College London, London 2006 March)
3. Reisi: ‘Windmonitor – cumulated installed wind capacity in Germany’. Provided by ISET, Kassel available at www.windmonitor.de, accessed February 2008
4. ‘Large scale integration of wind energy in the European power supply: analysis, issues and recommendations’, (European Wind Energy Association (EWEA) 2005)